The Optical Networking and Communication
Conference & Exhibition

San Diego Convention Center,
San Diego, California, USA

Digital Signal Processing and Advanced Modulation

  Sunday, March 3 Monday, March 4 Tuesday, March 5 Wednesday, March 6 Thursday, March 7
Workshop: Optical Experiments and Testing: With or without FEC? 1:00 PM - 3:30 PM        
Workshop: Will Advanced Direct-detection Systems Ever Be the Solution of Choice for Metro and Access Applications? 4:00 PM - 6:30 PM        
Nonlinearity Mitigation and Modeling (M1I)   8:00 AM - 10:00 AM      
Short Reach I (M1H)   8:00 AM - 10:00 AM      
Advanced Signal Processing (M2H)   10:30 AM - 12:15 PM      
Deployable Technology For Future Networks (M3J)   2:00 PM - 4:00 PM      
Coherent Systems for Data Centers (M3H)   2:00 PM - 4:00 PM      
Transmission Technologies (M4I)   4:30 PM - 6:30 PM      
Probabilistic Shaping I (M4B)   4:30 PM - 6:30 PM      
Short Reach II (Tu2F)     2:00 PM - 3:45 PM    
Show Floor: Automating the Shift to 400G: Innovations in Packet Optical Integration     2:00 PM - 5:00 PM    
Probabilistic Shaping II (W1D)       8:00 AM - 10:00 AM  
Coding and Modulation (W3H)       2:00 PM - 3:45 PM  
Show Floor: The Path to Open , Interoperable Optical Networking (OIF)         11:15 AM - 12:15 PM
Coherent PON (Th3F)         2:00 PM - 3:45 PM
Workshop: Super DACs and ADCs - To Interleave or not to Interleave         4:00 PM - 6:30 PM

Direct Detection of the Optical Field Beyond Single Polarization Mode (M1H.1)
8:00 AM - 8:30 AM     Invited
Direct Detection of the Optical Field Beyond Single Polarization Mode

Authors: W. Shieh, University of Melbourne, Glen Waverley, Victoria, AUSTRALIA

Clipping-Enhanced Kramers-Kronig Receivers (M1H.2)
8:30 AM - 8:45 AM     
Simulations show that strongly clipping signals to the Kramers-Kronig processing’s logarithm (limiting their lower extent) substantially improves error rates, enabling < 7-dB carrier-to-signal ratios at achievable SNRs, to support low-latency KP4 FEC.

Authors: A.J. Lowery, T. Wang, B. Corcoran, Electrical and Computer Systems Engineering, Monash University, Clayton, Victoria, AUSTRALIA

Modified KK Receiver with Accurate Field Reconstruction at Low CSPR Condition (M1H.3)
8:45 AM - 9:00 AM     
A modified KK receiver based on an exponential operation is proposed to accurately reconstruct the field at a low CSPR in a DD system. We experimentally demonstrate a 2-dB sensitivity improvement after 40-km SMF transmission.

Authors: S. An, Q. Zhu, J. Li, Y. Su, Shanghai Jiao Tong University, Shanghai, SHANGHAI, CHINA

Optimally Partitioned Precoding Assisted Hybrid Constellation Entropy Loading for SSB-DMT Systems (M1H.4)
9:00 AM - 9:15 AM     
We propose the optimally partitioned precoding to perform hybrid constellation entropy loading. Up to 9% net data rate gain is achieved compared to bit power loading scheme for the SSB-DMT system after 80 km transmission.

Authors: X. Chen, Y. Chen, M. Tang, S. Fu, L. Xia, D. Liu, Wuhan National Laboratory for Optoelectronics (WNLO) & Next Generation Internet Access National Engineering Lab (NGIA), School of Optical and Electronic Information, Huazhong University of Science and Technology, WuHan, HuBei , CHINA|J. cui, Photonics Research Center, Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon, HuBei , HONG KONG

112GBd Virtual-Carrier Assisted Single-Sideband PAM4 with Kramers-Kronig Detection and Blind Adaptive IQ Imbalance Compensation (M1H.5)
9:15 AM - 9:30 AM     
We propose a novel IQ imbalance compensation algorithm for virtual-carrier assisted single sideband PAM signal. We demonstrate performance improvement on single-λ 112GBd VSSB-PAM4 with KK receiver and IQ imbalance compensation when there is IQ mismatch.

Authors: A. Li, W. Peng, Y. Cui, Y. Bai, Futurewei Technologies, Inc., Santa Clara, California, UNITED STATES

Towards Low Carrier-to-Signal Power Ratio for Kramers-Kronig Receiver (M1H.6)
9:30 AM - 9:45 AM     
We propose a novel scheme to relax the requirement of high carrier-to-signal power ratio for Kramers-Kronig receiver. By adopting low carrier-to-signal power ratios, we obtain optical signal-to-noise ratio improvement of up to 1.9 dB.

Authors: C. Sun, D. Che, H. Ji, W. Shieh, University of Melbourne, Melbourne, Victoria, AUSTRALIA

Coherent versus Kramers-Kronig Transceivers in Metro Applications: A Power Consumption Perspective (M1H.7)
9:45 AM - 10:00 AM     
We estimate power consumption of coherent and Kramers-Kronig (KK) transceivers with various configurations. We show that KK transceivers consume comparable power with coherent transceiver, but upsampling-free KK transceiver consumes 33% less power than coherent one.

Authors: T. Bo, H. Kim, Korea Advanced Inst of Science & Tech, Daejeon, KOREA (THE REPUBLIC OF)

Nyquist Filtering and Fiber Nonlinearity Distortions Mitigation of Three-Carrier 480Gb/s DP-16QAM with Multiplier-Free MAP Detection (M1I.1)
8:00 AM - 8:15 AM     
A modified multiplier-free MAP detection is proposed for a three-carrier 480Gb/s Nyquist DP-16QAM system. Simulation and experimental results demonstrate its competitive performance on filtering and fiber nonlinearity distortion mitigation with significantly reduced complexity.

Authors: Y. Tao, L. Wang, X. Chen, H. chen, H. Pan, X. Luo, Beijing Univ of Posts & Telecom, Beijing, BEIJING, CHINA

Low-Complexity Non-Linear Phase Noise Mitigation using a Modified Soft-Decoding Strategy (M1I.2)
8:15 AM - 8:30 AM     
We propose a modified soft-decoding strategy that takes into account residual non-linear phase noise. We show the effectiveness of this method in a multi-span experiment with propagation over legacy fibers using uniform and probabilistic-shaped constellations.

Authors: D. Pilori, P. Poggiolini, G. Bosco, DET, Politecnico di Torino, Torino, TO, ITALY|A. Nespola, LINKS Foundation, Torino, TO, ITALY|F. Forghieri, Cisco Photonics Italy srl, Vimercate, MB, ITALY

Power Spectral Density Estimation in Dispersion Unmanaged Coherent Metro Networks (M1I.3)
8:30 AM - 8:45 AM     
We propose a semi-analytical model for predicting nonlinear distortion spectral density in dispersion unmanaged systems. We experimentally demonstrate the model in several heterogeneous metro links proving its accuracy even with various phase estimation techniques.

Authors: M. Lonardi, University of Parma, Parma, ITALY|M. Lonardi, P. Ramantanis, P. Jennevé, S. Bigo, Nokia Bell Labs France, Nozay, FRANCE

Accurate Non-Linearity Fully-Closed-Form Formula based on the GN/EGN Model and Large-Data-Set Fitting (M1I.4)
8:45 AM - 9:00 AM     
We tested the accuracy of a fully-closed-form GN/EGN formula over 1,700 different fully-loaded systems. We improved it greatly through a correction that leverages the large data-set, providing an effective tool for real-time physical-layer-aware network management.

Authors: P. Poggiolini, M. Ranjbar Zefreh, G. Bosco, Politecnico di Torino, Turin, TO, ITALY|F. Forghieri, S. Piciaccia, Cisco Photonics Italy srl, Vimercate, Monza-Brianza, ITALY

An Efficient Nonlinear Fourier Transform Algorithm for Detection of Eigenvalues from Continuous Spectrum (M1I.5)
9:00 AM - 9:15 AM     
We present an efficient, fast and robust Nonlinear Fourier Transform (NFT) algorithm to detect eigenvalues of the discrete spectrum. It outperforms other known NFT algorithms as it detects the eigenvalues from the continuous spectrum, the numerically more robust part of the nonlinear spectrum.

Authors: V. Aref, S.T. Le, H. Buelow, Nokia Bell Labs, Stuttgart, GERMANY

Experimental Demonstration of Data Transmission Based on the Exact Inverse Periodic Nonlinar Fourier Transform (M1I.6)
9:15 AM - 9:30 AM     
We design a two-dimensional signal constellation based on the exact periodic inverse nonlinear Fourier transform. Feasibility of continuous transmission with periodic signals is experimentally demonstrated over more than 2000 km.

Authors: J. Goossens, H. Hafermann, Huawei Technologies France S.A.S.U., Boulogne-Billancourt, FRANCE|J. Goossens, Y. Jaouën, Communications and Electronics Department, Telecom ParisTech, Paris, FRANCE

Multi-Stage Machine Learning Enhanced DSP for DP-64QAM Coherent Optical Transmission Systems (M2H.1)
10:30 AM - 10:45 AM     
We propose to improve DSP for coherent-signal recovery with distributed multi-stage machine-learning algorithms. Experiments demonstrate more-than-3-dB and 1-dB improvements in OSNR sensitivities for 40-GBd and 60-GBd DP-64QAM at BER thresholds of 4.5×10-3 and 1.6×10-2 respectively.

Authors: M. Xu, J. Zhang, H. Zhang, Z. Jia, J. Wang, L. Cheng, A. Campos, C. Knittle, CableLabs, Louisville, Colorado, UNITED STATES

Mode-dependent Probabilistic Shaping for Highly-Efficient Weakly Coupled 10-Mode Fiber Transmission (M2H.2)
10:45 AM - 11:00 AM     
We newly introduced mode-dependent probabilistically shaped (PS-) QAM signals for modal XT limited weakly coupled few-mode fiber transmission and the 16% higher aggregated SE over 81-km transmission than that of QPSK signals was obtained.

Authors: S. Beppu, D. Soma, S. Sumita, K. Igarashi, H. Takahashi, T. Tsuritani, KDDI Research, Saitama, JAPAN|K. Igarashi, Osaka University, Osaka, JAPAN|Y. Wakayama, KDDI Corp., Tokyo, JAPAN

Subcarrier Power Loading for Coherent Optical OFDM optimized by Machine Learning (M2H.3)
11:00 AM - 11:15 AM     
Enhanced power loading based on machine learned subcarrier interactions and nonlinear SNR progression is proposed to improve BER performance in optical coherent OFDM systems, achieving a gain of 0.5 dB in OSNR vs. classical schemes.

Authors: M. Schaedler, M. Kuschnerov, C. Blümm, F. Pittala, C. Xie, Huawei Munich Research Center, Munich, GERMANY|S. Pachnicke, Chair of Communications, Kiel University (CAU), Kiel, GERMANY

Dual-Polarization On-Line 256 and 512 QAM Digital Coherent Transmission (M2H.4)
11:15 AM - 11:30 AM     
We demonstrate the first dual-polarization on-line 5 Gbaud, 256 and 512 QAM coherent transmissions using an FPGA-based transmitter and receiver. Error-free operation with 14% overhead FEC was achieved for 256 QAM-160km and 512 QAM-20km transmissions.

Authors: M. Yoshida, K. Kasai, T. Hirooka, M. Nakazawa, Tohoku University, Sendai, MIyagi, JAPAN

Signal Processing Techniques for Nonlinear Fourier Transform Systems (M2H.5)
11:30 AM - 12:00 PM     Invited
Nonlinear fiber-optic transmissions based on Nonlinear Fourier Transform (NFT) is an emerging area in optical communications with more and more experiments demonstrating their potentials. We review recent developments in signal processing techniques for NFT systems.

Authors: A. Lau, G. Zhou, T. Gui, Photonics Research Center, Department of Electrical Engineering, Hong Kong Polytechnic University, Kowloon, HONG KONG|C. Lu, P. Wai, Photonics Research Center, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, HONG KONG|T. Gui, Huawei Tech. Co., Shenzhen, CHINA|T. Chan, Institute for Telecommunications Research, School of Information Technology and Mathematics, University of South Australia, Adelaide, South Australia, AUSTRALIA

120-GBaud 32QAM Signal Generation Using Ultra-Broadband Electrical Bandwidth Doubler (M2H.6)
12:00 PM - 12:15 PM     
We propose an electrical spectrum synthesis technique using digital pre-processing with an interband crosstalk compensation and newly developed ultra-broadband electrical bandwidth doublers. A 120-GBaud PDM-32QAM signal (net rate: 954.2 Gb/s) has been successfully generated.

Authors: F. Hamaoka, M. Nakamura, M. Nagatani, T. Kobayashi, A. Matsushita, H. Yamazaki, H. Nosaka, Y. Miyamoto, NTT Network Innovation Laboratories, Yokosuka, JAPAN|M. Nagatani, H. Wakita, H. Yamazaki, H. Nosaka, NTT Device Technology Laboratories, Atsugi, JAPAN

Data Center Interconnect Systems with Coherent Detection (M3H.1)
2:00 PM - 3:00 PM     Tutorial
In this tutorial we will discuss the characteristics of between-datacenter optical interconnects, with distances of the order of 100km, and the cost-effective strategies to implement these very high speed optical links.

Authors: R. Nagarajan, Inphi Corporation, Santa Clara, California, UNITED STATES

A Low-Complexity Adaptive Equalizer for Digital Coherent Short-Reach Optical Transmission Systems (M3H.2)
3:00 PM - 3:15 PM     
We propose a novel adaptive equalization algorithm for short-reach digital coherent systems targeting intra-datacenter applications. Its performance is similar to conventional method, while the number of real multipliers is reduced by ~65%.

Authors: J. Cheng, Alibaba Group, Hangzhou, CHINA|M. Tang, S. Fu, Huazhong University of Sci. & Tech., Wuhan, CHINA|C. Xie, Alibaba Group, Sunnyvale, California, UNITED STATES

Single Carrier vs. OFDM for Coherent 600Gb/s Data Centre Interconnects with Nonlinear Equalization (M3H.3)
3:15 PM - 3:30 PM     
Single lambda coherent 600Gb/s solutions based on single carrier modulation or OFDM with and without bit and power loading are experimentally assessed. Volterra nonlinear equalization architectures are optimized for the most performant schemes.

Authors: C. Blümm, M. Schaedler, M. Kuschnerov, F. Pittala, C. Xie, Huawei, Munich, GERMANY

400G and Beyond: Coherent Evolution to High-Capacity Inter Data Center Links (M3H.4)
3:30 PM - 4:00 PM     Invited
Coherent data transmission applications to the data center interconnect space are presented. We discuss methods of increasing the data rate beyond 400Gb/s, and the improvements in signal-to-noise ratio requirements when Ethernet optimized transport is used.

Authors: E.S. Maniloff, S. Gareau, M. Moyer, Ciena Corporation, Ottawa, Ontario, CANADA

Nonlinear Mitigation Enabling Next Generation High Speed Optical Transport beyond 100G. (M3J.1)
2:00 PM - 2:30 PM     Invited
We consider methods for containment of the effects of optical nonlinearities in coherent optical transmission. These are distinguished according to their practicality and effectiveness.

Authors: K. Roberts, M. O'Sullivan, M. Reimer, M. Hubbard, Ciena Corporation, Ottawa, Ontario, CANADA

Closer to Shannon (M3J.2)
2:30 PM - 3:00 PM     Invited
Despite the sophistication of existing optical transport solutions, substantial additional capacity and reach gains can be achieved through improvements in the areas of implementation penalty, nonlinear propagation, forward error correction, and modulation.

Authors: C. Rasmussen, Acacia Communications Inc., Maynard, Massachusetts, UNITED STATES

Next Generation Silicon Photonic Interconnect Solutions (M3J.3)
3:00 PM - 3:30 PM     Invited
, Silicon Photonics is expected to be the technology platform to address next-generation optical interconnect solutions. By leveraging existing semiconductor production infrastructure and processes as well as building complex optical system-on-chip solutions, SiPh enables opportunities for a wide range of new applications.

Authors: M. Bohn, P. Magill, M. Hochberg, D. Scordo, A. Novack, M. Streshinsky, Elenion Technologies, New York, New York, UNITED STATES

Field Test of Installed High-Density Optical Fiber Cable with Multi-Core Fibers toward Practical Deployment (M3J.4)
3:30 PM - 3:45 PM     
A field trial of high-density 0.92-km 200-fiber cable with 5-core fibers (5CFs) was conducted for reliability tests. No degradation of cable attenuation of 5CFs was observed even after installation into underground conduits and aerial area.

Authors: T. Tsuritani, D. Soma, I. Morita, KDDI Research, Inc., Saitama, JAPAN|Y. Wakayama, Y. Miyagawa, M. Takahashi, KDDI Coorperation, Tokyo, JAPAN|K. Maeda, K. Kawasaki, T. Matsuura, M. Tsukamoto, R. Sugizaki, Furukawa Electric, Chiba, JAPAN

Accurate Fault Location based on Deep Neural Evolution Network in Optical Networks for 5G and Beyond (M3J.5)
3:45 PM - 4:00 PM     
This paper presents an accurate fault location method based on deep neural evolution network in optical networks. Experiments indicate that the proposed method improves the accuracy of fault location when confronted with large-scale alarm sets.

Authors: X. Zhao, H. Yang, J. Zhang, Beijing University of Posts and Telecom., Beijing, BeiJIng, CHINA|H. Guo, T. Peng, ZTE, Shenzhen, BeiJIng, CHINA

Rate-Adaptive Probabilistic Shaping Enabled by Punctured Polar Codes with Pre-set Frozen Bits (M4B.1)
4:30 PM - 4:45 PM     
We propose to pre-set the frozen bits of a rate-adaptive punctured polar-coded system to pseudo-random sequences. The many-to-one probabilistic shaping gains are improved up to 2 dB (~160 km) w.r.t. the standard punctured polar-coded system.

Authors: S. Iqbal, M.P. Yankov, S. Forchhammer, Technical University of Denmark, Kongens Lyngby, DENMARK|M.P. Yankov, Fingerprint Cards A/S, Herlev, DENMARK

Polar-Coded Modulation for Joint Channel Coding and Probabilistic Shaping (M4B.2)
4:45 PM - 5:00 PM     
We propose joint channel coding and constellation shaping based on polar-coded modulation. Proposed shaping method offers more than 0.6 dB gain without the need of external distribution matcher and the increase of decoding complexity.

Authors: T. Matsumine, Yokohama National University, Yokohama, KANAGAWA, JAPAN|T. Matsumine, T. Koike-Akino, D. Millar, K. Kojima, K. Parsons, Mitsubishi Electric Research Laboratories, Cambridge, Massachusetts, UNITED STATES

Partition-Based Probabilistic Shaping for Fiber-Optic Communication Systems (M4B.3)
5:00 PM - 5:30 PM     Invited
Various aspects of distribution matchers (DMs) with constant and variable composition are reviewed. LDPC-coded fiber simulations of 64QAM shaped via a multiset-partition DM show significantly increased reach and information rate over a constant-composition DM.

Authors: T. Fehenberger, D. Millar, T. Koike-Akino, K. Kojima, K. Parsons, Mitsubishi Electric Research Labs, Cambridge, Massachusetts, UNITED STATES

Optimum Bit-Level Distribution Matching with at most O(N3) Implementation Complexity (M4B.4)
5:30 PM - 5:45 PM     
An algorithm of distribution matching which could be effectively implemented for short block lengths of around 100 bit or less is proposed, enabling better performance than the constant composition schemes with the same block lengths.

Authors: Y. Koganei, H. Nakashima, T. Hoshida, Fujitsu Laboratories Ltd., Kawasaki, KANAGAWA, JAPAN|K. Sugitani, Fujitsu Kyushu Network Technologies, Fukuoka, KANAGAWA, JAPAN

Simplified Bit-Level Shaping with High Spectral Efficiency and High Throughput (M4B.5)
5:45 PM - 6:00 PM     
We propose a simplified bit-level shaping method by optimizing the structure of product distribution matcher for high spectral efficiency and high throughput. Simulation and experimental comparisons based on 64QAM demonstrate the efficiency of our method.

Authors: Y. Chen, X. Chen, M. Tang, H. Jiang, Y. Xiang, T. Tong, S. Fu, D. Liu, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, HuBei , CHINA

Joint Source–Channel Coding via Compressed Distribution Matching in Fiber-Optic Communications (M4B.6)
6:00 PM - 6:15 PM     
The variability of source entropy due to data idling is inconsistent with most studies' assumptions in probabilistic shaping. We propose a distribution matcher sensitive to the source entropy, and discuss its impacts on fiber-optic communications.

Authors: T. Yoshida, Mitsubishi Electric Corporation, Kamakura, kanagawa, JAPAN|T. Yoshida, Graduate School of Engineering, Osaka University, Suita, Osaka, JAPAN|M. Karlsson, E. Agrell, Fiber Optic Communications Research Center (FORCE), Chalmers University of Technology, Gothenburg, Osaka, SWEDEN

Multi-Rate Prefix-Free Code Distribution Matching (M4B.7)
6:15 PM - 6:30 PM     
We propose a multi-rate prefix-free code distribution matching (PCDM) algorithm that implements a fixed-length probabilistic constellation shaping. It uses various small codebooks in an adaptive manner, thereby improving the shaping performance of PCDM.

Authors: J. Cho, P.J. Winzer, Nokia Bell Labs, Holmdel, New Jersey, UNITED STATES

A polarization change monitor by eigenvalue analysis in coherent receiver (M4I.1)
4:30 PM - 4:45 PM     
A method is proposed to monitor polarization change of optical link. Several-hundred-krad/s polarization change was monitored within errors less than 20 and 50 krad/s in back-to-back and transmission experiments, respectively.

Authors: T. Ye, X. Su, K. Zhang, Z. Tao, Fujitsu R&D Center, Beijing, BeiJIng, CHINA|G. Huang, H. Nakashima, T. Hoshida, Fujitsu Laboratories Ltd., Kawasaki, Kawasaki, JAPAN

Laser Frequency Jitter Tolerance and Linewidth Requirement for ≥ 64Gbaud DP-16QAM coherent systems (M4I.2)
4:45 PM - 5:00 PM     
Equalization-enhanced phase noise-dominated optical carrier frequency jitter tolerance and linewidth requirement for ≥ 64Gbaud DP-16QAM dispersion-unmanaged coherent systems have been investigated. The implication to future 100 Gbaud systems is delineated.

Authors: R. Zhang, G. Chang, Georgia Institute of Technology, Atlanta, GEORGIA|W. Jiang, K. Kuzmin, R. Juluri, W. Way, Neophotonics, San Jose, California, UNITED STATES

WDM Transmission of 600G Carriers over 5,600 km with Probabilistically Shaped 16QAM at 106 Gbaud (M4I.3)
5:00 PM - 5:15 PM     
We experimentally demonstrated 600G per-wavelength (848-Gbps coded line rate) probabilistically shaped 16QAM coherent WDM transmission over 5,600-km ultra-low-loss fibers with Raman amplification above the 27.5% SD-FEC threshold of 0.8 NGMI, attaining 27% transmission-distance improvement compared with regular-16QAM.

Authors: J. Yu, H. chien, ZTE TX Inc, Morristown, New Jersey, UNITED STATES|M. kong, K. wang, L. zhao, J. shi, X. Li, Fudan university, Shanghai, New Jersey, CHINA|X. pan, X. Xin, Beijing University of Posts and Telecommunications, Beijing, New Jersey, CHINA|B. Zhu, OFS, Somerset, New Jersey, UNITED STATES|Y. xia, B. ye, ZTE Corp, Beijing, New Jersey, CHINA

1.04 Tbps/carrier Probabilistically Shaped PDM-64QAM WDM Transmission over 240 km based on Electrical Spectrum Synthesis (M4I.4)
5:15 PM - 5:30 PM     
We demonstrate 1.04-Tbps/carrier net-rate 125-GHz-spaced 9-WDM (9.3-Tbps) transmission over 240-km using 120-GBd probabilistically shaped PDM-64QAM generated by electrical spectrum synthesis technique with in-house ultra-broadband bandwidth doublers with the spectral efficiency of 8.3 bps/Hz.

Authors: M. Nakamura, F. Hamaoka, M. Nagatani, H. Yamazaki, T. Kobayashi, A. Matsushita, S. Okamoto, H. Nosaka, Y. Miyamoto, NTT Network Innovation Laboratories, Yokosuka, JAPAN|M. Nagatani, H. Yamazaki, T. Kobayashi, H. Wakita, H. Nosaka, NTT Device Technology Laboratories, Atsugi, JAPAN

Performance and Impairments of Submarine Systems (M4I.5)
5:30 PM - 6:00 PM     Invited
This work summarizes effects and factors that limit capacity of submarine systems. Techniques for minimizing nonlinear impairments and maximizing information rate are presented. Capacity limitations arising from practical considerations are also discussed.

Authors: D. Foursa, SubCom, Eatontown, New Jersey, UNITED STATES

Demonstration of 100-Gb/s/λ PAM-4 Transmission over 45-km SSMF Using one 10G-class DML in the C-band (Tu2F.1)
2:00 PM - 2:15 PM     
We experimentally demonstrated single-lane 100-Gb/s PAM-4 signal transmission over 45-km SMMF based on joint algorithm and optical filtering technique using 10-GHz DML. 107.5-Gb/s PAM-4 signal transmission over 10-km without optical filtering can also be achieved.

Authors: J. zhang, J. Yu, ZTE TX Inc, Morristown, New Jersey, UNITED STATES|J. zhang, X. Li, Y. wei, K. wang, L. zhao, W. Zhou, J. Xiao, Fudan university, Shanghai, New Jersey, CHINA|X. pan, X. Xin, Beijing University of Posts and Telecommunications, Beijing, New Jersey, CHINA|L. zhang, Y. zhang, ZTE Corp, Beijing, New Jersey, CHINA

120-Gb/s DP-QPSK Transmission using Polarization-Diversity Stokes-Analyzer-Based Coherent Receiver (Tu2F.2)
2:15 PM - 2:30 PM     
We propose a simple polarization-diversity coherent receiver by taking advantage of the features of the Stokes analyzer. Using a prototype of the receiver, we successfully transmitted 120-Gb/s DP-QPSK signals over a 100-km SMF.

Authors: S. Ishimura, K. Nishimura, KDDI Research, Inc., Fujimino-shi, Saitama, JAPAN|S. Ishimura, T. Tanemura, School of Engineering, The University of Tokyo, Tokyo, Saitama, JAPAN

Polarity-Header Optical OFDM for IM/DD Communication Systems (Tu2F.3)
2:30 PM - 2:45 PM     
Polarity-header optical OFDM modulation for bandlimited noncoherent optical communication systems improves the spectral efficiency, providing a better bit error rate performance and higher achievable data rate compared with benchmark schemes.

Authors: J. Lian, M. Brandt-Pearce, University of Virginia, Charlottesville, Virginia, UNITED STATES

Optical Amplifier-free 100 Gbit/s/lamda PAM-N Transmission and Reception in O-band over 40-km SMF with 10-G Class DML (Tu2F.4)
2:45 PM - 3:00 PM     
Pre-equalization with different Rx FFE tap-coefficients is investigated for different bandwidth PAM-N, also nonlinear-distortions is compensated by LUT. 100Gbit/s PAM-N is successfully transmitted over 30-km SMF with 10-G class DML with BER under 3.8×10-3.

Authors: F. Li, D. Zou, X. Yi, Z. Li, Sun Yat-Sen University, Guangzhou, GuangDong, CHINA|Q. Sui, J. Li, Jinan University, Guangzhou, GuangDong, CHINA|L. Li, Huawei Technologies Co., Ltd., Shenzhen, Guangdong, CHINA

Beyond 1Tb/s Datacenter Interconnect Technology: Challenges and Solutions (Tu2F.5)
3:00 PM - 3:30 PM     Invited
We discuss challenges and solutions for beyond 1Tb/s intra-datacenter bandwidth scaling, with a focus on the FlexPAM-based direct detection and the baud-rate DSP enabled coherent detection.

Authors: X. Zhou, R. Urata, H. Liu, Google, Sunnyvale, California, UNITED STATES

4×288Gb/s Orthogonal Offset Carriers Assisted PDM Twin-SSB WDM Transmission with Direct Detection (Tu2F.6)
3:30 PM - 3:45 PM     
We demonstrate 4×288Gb/s direct detection transmission of WDM PDM Twin-SSB signals with orthogonal offset carriers. With Kramers-Kronig detection or joint signal-signal beat interference cancellation, the BERs of all the channels are below 20% HD-FEC Threshold.

Authors: Y. Zhu, P. Wang, M. Jiang, F. Zhang, Peking University, Beijing, BeiJIng, CHINA

Non-Orthogonal WDM Systems with Faster Than Nyquist Technology (W1D.1)
8:00 AM - 8:30 AM     Invited
We propose the concept of non-orthogonal WDM and review the principle of FTN. Performance comparison between FTN and constellation shaping is presented. Simulation results of FTN-CS-QAM are shown to support the evolution of 400G WDM

Authors: L. Li, Z. Xiao, L. Liu, Y. Lu, Huawei Technologies Co Ltd, Shenzhen, GUANGDONG, CHINA

Blind Polarization Demultiplexing and Equalization of Probabilistically Shaped QAM (W1D.2)
8:30 AM - 8:45 AM     
A novel, two-stage algorithm for polarization demultiplexing and equalization of probabilistically shaped QAM is presented. It operates blindly, requiring no knowledge of the channel or transmitted sequence. Performance is validated under realistic PMD conditions.

Authors: S. Dris, S. Alreesh, A. Richter, VPIphotonics GmbH, Berlin, GERMANY

MAP Detection of Probabilistically Shaped Constellations in Optical Fiber Transmissions (W1D.3)
8:45 AM - 9:00 AM     
We present the theoretical analysis and experimental demonstration of MAP detection that outperforms the conventional detection for probabilistically shaped constellations in optical fiber transmissions. Larger BER improvements are observed for the stronger shaped constellations.

Authors: X. Yi, Z. Li, F. Li, Sun Yat-sen University, Guangzhou, GuangDong, CHINA|S. hu, W. zhang, M. Zhu, J. Zhang, K. Qiu, University of Electronic Science and Technology of China, Chengdu, Sichuan, CHINA|X. huang, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi'an, Shanxi, CHINA

Shaping Factor Detuning for Optimized Phase Recovery in Probabilistically-Shaped Systems (W1D.4)
9:00 AM - 9:15 AM     
We propose to optimize the phase recovery performance in probabilistically-shaped systems by detuning the shaping factor of the Maxwell-Boltzmann distribution. The results indicate tangible gains in the mutual information without increasing complexity.

Authors: F.A. Barbosa, D.A. Mello, University of Campinas, Campinas, SP, BRAZIL

Experimental Analysis of Laser Phase Noise Tolerance of Uniform 256QAM and Probabilistically Shaped 1024QAM (W1D.5)
9:15 AM - 9:30 AM     
We experimentally compare laser linewidth tolerance of US-256QAM and PS-1024QAM. US-256QAM has higher achievable information rate (AIR) with <5% pilot symbol and 40 kHz linewidth, while PS-1024QAM realizes higher AIR than US-256QAM with narrower linewidth.

Authors: T. Sasai, A. Matsushita, M. Nakamura, S. Okamoto, F. Hamaoka, Y. kisaka, NTT, Yokosuka, KANAGAWA, JAPAN

Probabilistic Shaping of Set-Partition mQAM (W1D.6)
9:30 AM - 9:45 AM     
We propose novel probabilistic shaping of set-partition mQAM signals to extend the entropy range below 2 bits/symbol and demonstrate a performance gain of 0.45dB compared to time-domain hybrid QAM at the same achievable information rate.

Authors: I. Kim, O. Vassilieva, P. Palacharla, T. Ikeuchi, Fujitsu Laboratories of America, Richardson, Texas, UNITED STATES

On the Performance Metric and Design of Non-Uniformly Shaped Constellation (W1D.7)
9:45 AM - 10:00 AM     
Asymmetric information is shown to be more accurate in characterizing the performance of quadrant folding shaped (QFS) M-QAM. The performance difference of QFS M-QAM schemes strongly depends on the FEC coding rate, and the optimum FEC coding rate is found to be around ~0.8, which is independent of QFS M-QAM and the designed rates.

Authors: S. Zhang, F. Yaman, NEC Laboratories America Inc, Princeton, New Jersey, UNITED STATES|E. Mateo, K. Nakamura, T. Inoue, Y. Inada, Submarine Network Division, NEC Corporation, Tokyo, New Jersey, JAPAN|I. Djordjevic, ECE, University of Arizona, Tuscon, Arizona, UNITED STATES

Low-Complexity, Low-PAPR Polarization-Time Code for PDL Mitigation (W3H.1)
2:00 PM - 2:15 PM     
We apply a polarization-time (PT) code based on number theory for PDL mitigation. The PT code has comparable PDL mitigation performance to the best PT codes reported so far, and higher tolerance to fiber nonlinearities.

Authors: T. Oyama, G. Huang, H. Nakashima, Y. Nomura, T. Takahara, T. Hoshida, Fujitsu Laboratories Ltd., Kawasaki, Kanagawa, JAPAN

FPGA-Based Real-Time Soft-Decision LDPC Performance Verification for 50G-PON (W3H.2)
2:15 PM - 2:30 PM     
We have studied the combined use of the mother LDPC code from ongoing industrial standards and soft-decision to further improve the performance of the FEC. Through experimental measurements based on a real-time FPGA platform, we found that this approach offers ~1.3 dB more gross coding gain.

Authors: M. Yang, I. Djordjevic, University of Arizona, Tucson, Arizona, UNITED STATES|X. Liu, L. li, Futurewei Technologies, Bridgewater, New Jersey, UNITED STATES

First Experimental Verification of Improved Decoding of Staircase Codes using Marked Bits (W3H.3)
2:30 PM - 2:45 PM     
Experimental validation for improved staircase decoding via marked bits is shown for the first time. Using a single-span hybrid-amplified recirculating loop experiment, we demonstrate reach increases of up to 240 km.

Authors: B. Chen, Y. Lei, S. van der Heide, J. van Weerdenburg, A. Alvarado, C. Okonkwo, Eindhoven University of Technology, Eindhoven, NETHERLANDS|Y. Lei, Beijing University of Posts and Telecommunications, Beijing, CHINA

Nonbinary Polar Coding for Multilevel Modulation (W3H.4)
2:45 PM - 3:00 PM     
We investigate nonbinary polar-coded modulations, which achieve a significant performance gain of at least 1 dB compared to binary counterparts at a short block-length of 2048 bits.

Authors: S. Cayci, T. Koike-Akino, Y. Wang, Mitsubishi Electric Research Labs, Cambridge, Massachusetts, UNITED STATES

Partially Ordered Statistics Demapping for Multi-Dimensional Modulation Formats (W3H.5)
3:00 PM - 3:15 PM     
We propose a very-low complexity and high-performance algorithm for soft-demapping of multi-dimensional modulation formats. We assess its performance over the linear channel for four 8D formats, generated using binary arithmetics. This solution outperforms current algorithms in terms of complexity without loss in performances.

Authors: D. BENDIMERAD, H. ZHANG, I. LAND, H. Hafermann, Huawei Technologies France, Paris, FRANCE

Energy-Efficient Soft-Assisted Product Decoders (W3H.6)
3:15 PM - 3:30 PM     
We implement a 1-Tb/s 0.63-pJ/bit soft-assisted product decoder in a 28-nm technology. The decoder uses one bit of soft information to improve its net coding gain by 0.2 dB, reaching 10.3-10.4 dB, which is similar to that of more complex hard-decision staircase decoders.

Authors: C. Fougstedt, A. Sheikh, A. Graell i Amat, P. Larsson-Edefors, Chalmers University of Technology, Gothenburg, SWEDEN|G. Liva, German Aerospace Center (DLR), Wessling, GERMANY

ASIC Design Exploration of Phase Recovery Algorithms for M-QAM Fiber-Optic Systems (W3H.7)
3:30 PM - 3:45 PM     
We develop circuit implementations and explore design optimizations for one blind and one pilot-based carrier phase-recovery algorithm, where the former algorithm is shown to dissipate 1.8–4.5 pJ/bit and the latter 0.5–0.3 pJ/bit, using 16 to 256QAM.

Authors: E. Börjeson, C. Fougstedt, P. Larsson-Edefors, Chalmers University of Technology, Göteborg, SWEDEN

200-Gb/s/λ PDM-PAM-4 PON with 29-dB Power Budget based on Heterodyne Coherent Detection (Th3F.1)
2:00 PM - 2:15 PM     
We experimentally demonstrated single-lane EML-based IM/DD 106-Gbaud PAM-4 and PS-PAM-8 signals transmission over 1-km NZDSF based on Pre-EQ and clipping technique. 260-Gb/s PS-PAM-8 signal transmission can be achieved.

Authors: J. zhang, J. Yu, X. Xiao, ZTE TX Inc, Morristown, New Jersey, UNITED STATES|J. zhang, K. wang, W. Zhou, L. zhao, Fudan university, Shanghai, New Jersey, CHINA|X. pan, B. Liu, X. Xin, Beijing University of Posts and Telecommunications, Beijing, New Jersey, CHINA

Demonstration of Bidirectional Real-Time 100 Gb/s (4×25 Gb/s) Coherent UDWDM-PON with Power Budget of 44 dB (Th3F.2)
2:15 PM - 2:30 PM     
We experimentally demonstrate the real-time of 4×25-Gb/s coherent UDWDM-PON at 12.5-GHz spacing over 50-km standard single mode optical fiber. The downlink power budget can be more than 44 dB, and support more than 1000 subscribers.

Authors: M. Luo, W. Li, T. Zeng, L. Meng, Z. He, C. Li, X. Li, Wuhan Research Institute of Posts and Telecommunications, Wuhan, HUBEI, CHINA|D. Wu, L. Zhou, Inst. of Microelectronics of Chinese Academy of Science, Beijing, HUBEI, CHINA

Real-Time Demonstration of an Integrated Metro-Access Network Carrying Live VR Traffic Based on Multi-Carrier Modulation and Simplified Sub-band Coherent Detection (Th3F.3)
2:30 PM - 2:45 PM     
We present an integrated metro-access networking scheme based on Alamouti-coded multi-carrier modulation and simplified sub-band coherent detection, and experimentally demonstrated it with real-time DSP in a 300-km communication link carrying live VR traffic, showing error-free performance with a low end-to-end latency of 1.5 ms.

Authors: Y. Le, N. Deng, Z. Dong, Z. Feng, T. Chang, Huawei Technologies Co., Ltd, Shenzhen, GuangDong, CHINA|H. Zeng, S. Megeed, A. Shen, X. Liu, Futurewei Technologies, Bridgewater, New Jersey, UNITED STATES

Colorless Coherent Passive Optical Network Using a Frequency Comb Local Oscillator (Th3F.4)
2:45 PM - 3:00 PM     
We propose a colorless coherent PON architecture alleviating the need for wavelength locking of the ONU lasers. Using two different types of comb sources, we demonstrate error-free reception at -25 dBm received power over bandwidths of 600 GHz and 1 THz, respectively.

Authors: M. Adib, J.N. Kemal, C. Füllner, M. Mahmud, C. Koos, W. Freude, S. Randel, Institute of Photonics and Quantum Electronics (IPQ), Karlsruhe Institute of Technology, Karlsruhe, GERMANY|C. Koos, Institute of Microstructure Technology (IMT), Karlsruhe Institute of Technology (KIT), Karlsruhe, Baden-Wuerttemberg, GERMANY|A. Ramdane, Center for Nanosciences and Nanotechnologies (CNRS), Paris-Sud University, Marcoussis, Baden-Wuerttemberg, FRANCE

Coherent ONU Designs for 50 Gb/s/λ PON (Th3F.5)
3:00 PM - 3:30 PM     Invited
The required complexity of coherent technology has always been a show-stopper in optical access networks. Here, the recent compelling research activities in low-complexity coherent PON are reviewed, and their feasibility for 50 Gb/s/λ is investigated.

Authors: M. Erkilinç, C. Schubert, Photonic Networks and Systems, Fraunhofer HHI, Berlin, GERMANY|D. Lavery, P. Bayvel, R. Killey, Dept. of EE Engineering, University College London, London, UNITED KINGDOM|S.J. Savory, Department of Engineering, University of Cambridge, Cambridge, UNITED KINGDOM

80-km Reach 28-Gb/s/λ RSOA-based Coherent WDM PON Using Dither-Frequency-Tuning SBS Suppression Technique (Th3F.6)
3:30 PM - 3:45 PM     
We experimentally demonstrate 80-km transmission of 28-Gb/s QPSK signal in loopback-configured coherent WDM-PON using RSOAs. Dither frequency is tuned to suppress the SBS and minimize the adverse effect of broadened linewidth on carrier phase estimation.

Authors: D. Kim, B. Kim, T. Bo, H. Kim, Korea Advanced Inst of Science & Tech, Daejeon, KOREA (THE REPUBLIC OF)

Workshop - Optical Experiments and Testing: With or without FEC?
3 March, 1:00 PM - 3:30 PM     

Forward error correction (FEC) is a key element in modern fiber optical communications. Yet, FEC is not included in many optical experiments. FEC implementation is typically avoided by using FEC thresholds. These thresholds allow researchers to make claims on post-FEC BER without actually implementing or testing the FEC. Strictly speaking, however, post-FEC BER can only be claimed if it is measured using an actual implementation.

We have heard voices from both sides. One group says, “Thresholds are enough to predict post-FEC BER.” The other group says, “You must always implement FEC.” In fact, there is not even consensus within the former group. Some believe pre-FEC BER is the right threshold, while others say that the (generalized) mutual information is the correct metric.

In this workshop, we gather together experts from different groups to have a head-to-head discussion on the pros and cons of implementing FEC as well as other advanced coding schemes in optical transmission experiments. The workshop aims at answering the following questions: Can we safely avoid implementing FEC in optical transmission experiments? And if so, what metric should we measure? This workshop will also address other more general questions about FEC. For example, how much more coding gain can we achieve in next generation FEC and at what cost? What are the best technologies for next generation FEC? Should we be considering standardized FEC to enable interoperability in long-haul transmission?

Workshop - Will Advanced Direct-detection Systems Ever Be the Solution of Choice for Metro and Access Applications?
3 March, 4:00 PM - 6:30 PM     

Anticipated traffic requirements for future metro and access applications seem to exceed the scaling capabilities of conventional intensity-modulation (IM) direct-detection (DD) systems. Various advanced DD systems, which include single-sideband modulation with digital signal-signal beating cancellation, Stokes receivers, and Kramers-Krönig receivers, have been recently proposed. These systems, which to various extents rely on the use of digital signal processing, offer increased throughput compared to IMDD systems, and require simpler optical hardware compared to coherent systems. On the other hand, coherent systems have the best cost-per-bit when Terabits per second per transceiver rates are targeted.

This workshop aims primarily to address the question of whether advanced DD systems will ever be realistically considered for commercial metro, access, and data center systems, or whether eventually coherent technology will just take over. 

Automating the Shift to 400G: Innovations in Packet Optical Integration
5 March, 4:00 PM - 5:00 PM     
The art of designing and evolving networks into simpler, more cost-effective operations in the 5G, IoT and Cloud era is rapidly approaching its next major inflection point. Demand for more infrastructure, for dynamic resource management and for on-demand enablement of increasing service types, are forcing paradigm shifts for how networks are engineered to support work flows. Automation and AI are key transformation agents to address these challenges. Networks can no longer be conceived in silos. They must be engineered with end-to-end integration and unification as end goals by leveraging packet-optical convergence, multivendor interoperability and multi-layer operational models. Three areas of innovation are converging to drive unprecedented changes in the way packet-optical networks are built and operated.

The Path to Open, Interoperable Optical Networking
7 March, 11:15 AM - 12:15 PM     

The goal of SDN is to enable flexible, automated and programmable networks that reduce Opex and accelerate service delivery. Realizing open, interoperable multi-vendor optical networking is one key to achieving this goal. A panel of industry experts will discuss the drivers, needs, and challenges in the evolution to widescale adoption of open, interoperable optical networks:
- Definition and specific requirements

- Risks, trade-offs and benefits

- Disaggregation, open line systems, and APIs

- Use cases, interop testing, trials and deployment scenarios

- Implementation agreements, interoperability demonstrations and certification testing

Workshop - Super DACs and ADCs - To Interleave or not to Interleave
3 March, 4:00 PM - 6:30 PM     

High-speed digital-to-analog (DAC) and analog-to-digital (ADC) conversion is at the heart of high performance digital-coherent optical communication systems. Today’s single-carrier systems are largely determined by available DAC/ADC bandwidths and resolutions that impose limits on useable symbol rates and constellation sizes. Similarly, alternative digital electronic multiplexing techniques also face this frontier. The analog interleaving of multiple converters into a “Super DAC/ADC” multiplexed system is becoming therefore an attractive approach to increase sample rates and bandwidth beyond that of state-of-the-art converters. However, it is not yet clear whether the additional hardware and complexity over traditional (e.g. wavelength-division) multiplexing techniques is justified, and which of the different interleaving concepts (time/frequency, analog electrical/optical) has the potential to make its way into future transmission systems (or into other applications of ultra-highspeed RF/optical waveform synthesis and analysis). In order to raise a discussion on these topics, the workshop wants to provide inputs on the requirements of future transmission systems, whether and how they can be met by traditional DAC and ADC architectures, what the advantages and limits of interleaved super DAC/ADCs are, and how they can be realized



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