The Optical Networking and Communication
Conference & Exhibition

San Diego Convention Center,
San Diego, California, USA

Data Center Technical

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Session Title
Monday, 20 March
Tuesday, 21 March
Wednesday, 22 March
Thursday, 23 March
Deployable Optical Access and Edge Networks 1:30 PM - 3:30 PM      
High-speed Subsystems 4:00 PM - 6:00 PM      
Control and Management for Future PON 4:00 PM - 6:00 PM      
Optical Data Center Networks 4:00 PM - 6:00 PM      
Advanced VCSEL Links   2:00 PM - 4:00 PM    
Modulation, Detection and DSP for PAM-4 Systems   2:00 PM - 4:00 PM    
VCSELs   4:30 PM - 6:30 PM    
Photonic/Electronic Integration and Packaging     8:00 AM - 10:00 AM  
Direct Detection Transceivers     1:00 PM - 3:00 PM  
Inter/Intra Data Center Networks     1:00 PM - 3:00 PM  
Data Center Interconnect Technologies     1:00 PM - 3:00 PM  
Subcarrier Multiplexing and Nonlinear Tolerant Transmission     1:00 PM - 3:00 PM  
Coded Modulation     3:30 PM - 5:30 PM  
PAM-4 Inter-data Center Transmission     3:30 PM - 5:30 PM  
High-speed Interconnects     3:30 PM - 5:30 PM  
Advances in Coherent Subsystems       8:00 AM - 10:00 AM
Coherent Technologies Access       8:00 AM - 10:00 AM
Click on a session title to see the featured presentations.

Antenna, Spectrum and Capacity trade-off for Cloud-RAN Massive Distributed MIMO over Next Generation PONs (M2I.1)
01:30 PM - 01:45 PM      Contributed Submission
We propose a cost-optimal antenna vs. spectrum resource allocation strategy for mobile 5G MD-MIMO over Next-Generation PONs. Comparing wavelength overlay and shared wavelength approaches, split-PHY leads to solutions with higher mobile capacity than fronthaul.

Demonstration of Radio and Optical Orchestration for Improved Coordinated Multi-point (CoMP) Service over Flexible Optical Fronthaul Transport Networks (M2I.2)
01:45 PM - 02:00 PM      Contributed Submission
We propose an SDN-enabled orchestration for the convergence of radio and optical networks in the 5G. Improved coordinated multi-point service is experimentally demonstrated in the cloud radio over flexible optical fronthaul transport networks (C-RoFlex) testbed.

The Evolution of Outside Plant Architectures Driven by Network Convergence and New PON Technologies (M2I.3)
02:00 PM - 02:30 PM      Invited Submission
We show that convergence of access networks together with new PON standards drive lower bandwidth cost, which in turn due to elasticity of demand results in larger number of users. According to Metcalf’s law that came into existence in 1980’s and explained the wide adoption of Ethernet cards, increase in network value will scale quadratically with the number of users, thus making convergence and new PON standards so valuable to network operators.

Strategies for VNF Placements in Large Provider Networks (M2I.6)
03:15 PM - 03:30 PM      Contributed Submission
We examine three strategies of VNF placement in a provider network: static service chains; seamless VNF duplication and VNF-dynamic-splitting. A constrained optimization applied to a large provider evaluates these strategies and showcases cost-latency trade-off.


Programmable Access and Edge Cloud Architecture (M3I.4)
05:00 PM - 06:00 PM      Tutorial Submission
We will discuss how converged access deployment will become more flexible thanks to a data center like approach for central offices, in which the control will be disaggregated from access functions in the data plane implemented on servers or specialized hardware.


A Simplified Dual-Carrier DP-64QAM 1 Tb/s Transceiver (M3D.2)
04:30 PM - 04:45 PM      Contributed Submission
A 1Tb/s net bitrate transceiver using a low complexity dual-carrier architecture with free running lasers and DP-64QAM, enabled by pilot-aided DSP and low-rate LDPC, is shown to achieve transmission over 400km with 100km amplifier spacing.

246 GHz Digitally Stitched Coherent Receiver (M3D.3)
04:45 PM - 05:00 PM      Contributed Submission
Phase estimation and 4×2 MIMO equalization techniques are experimentally compared for digital frequency stitching in ultra-wideband coherent reception, using time multiplexing and a single conventional dual polarization coherent receiver, to simultaneously detect a 5×46GBaud super-channel.

First Demonstration of an All Analog Adaptive Equalizer for Coherent DP-QPSK Links (M3D.5)
05:30 PM - 05:45 PM      Contributed Submission
For the first time, an all analog CMA equalizer for DP-QPSK transmission systems has been demonstrated. The experiment with an 8-Gb/s link shows promise for low power analog processing based receivers for short-reach DP-QPSK links.


Optical Technologies in Support of Computing Systems (M3K.1)
04:00 PM - 05:00 PM      Tutorial Submission
Abstract not available.

Novel Intra- and Inter-Datacenter Converged Network Exploiting Space- and Wavelength-Dimensional Switches (M3K.2)
05:00 PM - 05:15 PM      Contributed Submission
We propose a novel network architecture that enables intra- and inter-datacenter converged flow management. By adopting our proposed single large-scale optical circuit switch, intra- and inter-datacenter traffic can be transported without any blocking.

Does it Make Sense to put Optics in Both the Front and Backplane of a Large Data-Center? (M3K.3)
05:15 PM - 05:30 PM      Contributed Submission
We propose a dual optical architecture, with optics in both the front plane (connecting servers within a rack) and in the backplane (connecting TOR switches). The architecture is shown to scale to a million servers.

Bit-Parallel All-to-All and Flexible AWGR-based Optical Interconnects (M3K.4)
05:30 PM - 05:45 PM      Contributed Submission
This paper demonstrates bit-parallel, all-to-all communication with AWGR for on-board optical interconnects. A flexible bandwidth allocation is also presented. Trade-off studies optimize the bit-parallelism and achieve up to 3.5× higher energy efficiency compared to the single-bit case.

Emulation of a 16×16 Optical Switch Using Cascaded 4×4 Dilated Hybrid MZI-SOA Optical Switches (M3K.5)
05:45 PM - 06:00 PM      Contributed Submission
We demonstrate the first cascaded operation of integrated 4x4 hybrid MZI-SOA optical switches. Experimental studies emulate a 16×16 hybrid switch with 15dB IPDR for 1dB penalty and 43% reduced power consumption than equivalent SOA-based switches.


Future of Short-Reach Optical Interconnects based on MMF Technologies (Tu2B.1)
02:00 PM - 02:30 PM      Invited Submission
Important aspects of current and future optical interconnects over multimode optical fiber are reviewed, with an emphasis on links using short-wavelength VCSELs and PAM-4 modulation.

First Demonstration of PAM4 Transmissions for Record Reach and High-capacity SWDM Links Over MMF Using 40G/100G PAM4 IC Chipset with Real-time DSP (Tu2B.2)
02:30 PM - 02:45 PM      Contributed Submission
We experimentally demonstrate, for the first time, link BERs under KP4 FEC threshold at 42.5Gbps over 550m high bandwidth OM4 using single 850nm VCSEL and at aggregated 212.5Gbps over 300m wideband multimode fiber using SWDM TOSAs from 850 to 940nm, employing newly developed PAM4 ICs and direct detection, with novel Ge/Si APD or wideband PIN ROSA.

Universal Photonic Interconnect for Data Centers (Tu2B.4)
03:00 PM - 03:30 PM      Invited Submission
Tb/s class, co-packaged CWDM optical engine based on 4 wavelength VCSELs around 1um is presented. The capability to scale bandwidth and link distance > 2km using single mode VCSELs and standard SMF28 fiber is demonstrated.

4? x 100Gbps VCSEL PAM-4 Transmission over 105m of Wide Band Multimode Fiber (Tu2B.6)
03:45 PM - 04:00 PM      Contributed Submission
We demonstrate 100 Gbps PAM-4 transmission over 105m of wideband-MMF for each of four wavelengths from 850nm to 940nm using 25G VCSELs and thereby demonstrate an architecture that enables 400G over a single MMF.


A 64 Gb/s PAM-4 Transimpedance Amplifier for Optical Links (Tu2D.3)
02:30 PM - 02:45 PM      Contributed Submission
We present a 64 Gb/s PAM-4 transimpedance amplifier with 180 mW power consumption. By switching between four gain modes, modulation amplitudes between -7 dBm and at least -0.2 dBm yield a BER lower than 10-3.

Nonlinear Equalizer for 112-Gb/s SSB-PAM4 in 80-km Dispersion Uncompensated Link (Tu2D.5)
03:00 PM - 03:15 PM      Contributed Submission
We present a blindly adaptive nonlinear channel equalizer that effectively compensates nonlinearity in SSB-PAM4 transceiver components. The proposed scheme is demonstrated over 56GBaud PAM4 transmission over 80km dispersion uncompensated link with low BER near 10-4.

Transmission of 56-Gb/s PAM-4 Signal over 20 km of SSMF Using a 1.55-?m Directly-Modulated Laser (Tu2D.6)
03:15 PM - 03:30 PM      Contributed Submission
We demonstrate the transmission of 56-Gb/s PAM-4 signal over 20-km long SSMF by using a 1.55-?m DML without optical dispersion compensation. Instead, a linear electric equalizer is used for the compensation of dispersion-induced waveform distortions.

Recent Advances in Short Reach Systems (Tu2D.7)
03:30 PM - 04:00 PM      Invited Submission
In this paper, we review recent advances in high speed optical short reach transmission systems. Recent progress on advanced modulation formats, DSP, transmission schemes and devices are discussed.


High-Bandwidth and Low-Dimensional VCSELs for Optical Interconnects (Tu3C.1)
04:30 PM - 05:00 PM      Invited Submission
Abstract not available.

High-Capacity VCSEL Links (Tu3C.4)
05:30 PM - 06:30 PM      Tutorial Submission
This tutorial will cover the use and application of directly modulated Vertical Cavity Surface Emitting Lasers (VCSELs), for Data Centers and High Performance Computing (HPC) applications. Topics will include, advances in modulation formats, packaging, and fibers.


>1-Tb/s On-Board Optical Engine for High-Density Optical Interconnects (W1A.4)
09:00 AM - 09:30 AM      Invited Submission
We demonstrate a >1-Tb/s VCSEL-based on-board optical engine for high-density optical interconnects. The optical engine exhibits a good signal quality in an air-cooling environment with an ambient temperature of 40 °C


Datacenter Interconnect and Networking: from Evolution to Holistic Revolution (W3G.1)
01:00 PM - 01:30 PM      Invited Submission
In this presentation, we will review the evolution of Google's intra-datacenter interconnects and networking over the past decade, then outline future technology directions which, along with a more holistic design approach, will be needed to keep pace with the requirements and growth of the datacenter.

Impact of Damping on 50 Gbps 4-PAM Modulation of 25G Class VCSELs (W3G.2)
01:30 PM - 01:45 PM      Contributed Submission
We investigate the effects of photon lifetime and damping of the modulation response on the quality of 50 Gbps 4-PAM signal generation with directly modulated 25G class VCSELs and identify the appropriate values for the K-factor.

Eye Skew Modeling, Measurements and Mitigation Methods for VCSEL PAM-4 Channels at Data Rates over 66 Gb/s (W3G.3)
01:45 PM - 02:00 PM      Contributed Submission
Investigation of eye skew and techniques for reducing its impact on system performance at data rates from 64 Gb/s to 70 Gb/s using PAM-4 directly modulated VCSELs over 100 m MMF is presented.

Scalable and Low Cost Data Center Architecture for Cloud Services (W3G.4)
02:00 PM - 02:30 PM      Invited Submission
Abstract not available.

High Bit-Rate Distance Product of 128 Gbps?km 4-PAM Transmission over 2-km OM4 fiber Using an 850-nm VCSEL and a Volterra Nonlinear Equalizer (W3G.5)
02:30 PM - 02:45 PM      Contributed Submission
We successfully demonstrate a 64-Gbps 4-PAM transmission over 2-km OM4 fiber incorporating a Volterra equalizer with BER of 6.5×10-5. Record high bit-rate distance product of 128 Gbps?km is confirmed for optical-interconnect applications.

Experimentally Benchmarked fiber propagation model for 50Gbps PAM-4 MMF links employing multimode VCSELs (W3G.6)
02:45 PM - 03:00 PM      Contributed Submission
MMF propagation of multimode VCSEL signals with preferential coupling of VCSEL modes into fiber modes and colored noise is modeled and benchmarked using 50Gbps PAM-4 and 25Gbps PAM-2 experimental results at 850nm and 940nm.


Optical Communications Systems for Data Center Networking (W3B.1)
01:00 PM - 02:00 PM      Tutorial Submission
We present high-order modulation formats and digital signal processing techniques enabling intensity modulate/direct detection in short reach optical transmission systems ranging from 10 meters to 300 km. Techniques for increasing the capacity will be reviewed.

504 and 462 Gb/s Direct Detect Transceiver for Single Carrier Short-Reach Data Center Applications (W3B.2)
02:00 PM - 02:15 PM      Contributed Submission
We demonstrate a single carrier direct detect transceiver operating at 84 Gsymbols/s providing 5.5 and 6 bits per symbol delivering 462 and 504 Gb/s employing a novel modulation format and DSP for 400+ GbE PMD

280-Gb/s 320-km Transmission of Polarization-Division Multiplexed QAM-PAM with Stokes Vector Receiver (W3B.4)
02:30 PM - 02:45 PM      Contributed Submission
We propose a novel three-dimensional modulation scheme on Stokes space for metro and regional optical transmissions. Based on this scheme, 320-km transmission of 280-Gb/s 16QAM-PAM2 signals using a Stokes vector receiver is experimentally demonstrated.


Leveraging FlexGrid and Advanced Modulations in a Multi-Layer Inter-Datacenter Network (W3D.1)
01:00 PM - 01:30 PM      Invited Submission
The inter-DC network is unique due to a small number of locations, significant capacity, dynamic traffic and topology, and a large, shared pool of client capacity. FlexGrid increases spectrum per channel, while advanced modulations increase capacity per spectrum. The technologies combine to maximize transponder capacity and spectral efficiency.

Self-Adaptive, Multi-Rate Optical Network for Geographically Distributed Metro Data Centers (W3D.2)
01:30 PM - 01:45 PM      Contributed Submission
We propose a self-adaptive, multi-rate converged architecture and control-plane for metro-scale inter-data-center networks, enabling live autonomous bandwidth steering. Experimental and numerical evaluations demonstrate up to 5x and 25% improvements in transmission times and spectrum usage.

Evaluating the Impact of Data Center Locations and Distance-Adaptive Transmission on the Wavelength Resources for Serving Cloud Traffic (W3D.3)
01:45 PM - 02:00 PM      Contributed Submission
In this work, we evaluate the impact of distance-adaptive transmission and the locations of data centers (DCs) on the required bandwidth resources for serving DC-to-user and DC-to-DC cloud traffic.

Disaggregated Compute, Memory and Network Systems: A New Era for Optical Data Centre Architectures (W3D.4)
02:00 PM - 02:30 PM      Invited Submission
The disaggregated dRedBox Data Centre architecture is proposed that enables dynamic allocation of pooled compute and memory resources. An orchestration platform is described and algorithms are simulated that demonstrate the efficient utilization of IT infrastructure.

Network Performance Trade-Off in Optical Spatial Division Multiplexing Data Centers (W3D.5)
02:30 PM - 02:45 PM      Contributed Submission
We propose close-to-optimal network resource allocation algorithms modular data centers using optical spatial-division multiplexing. A trade-off between the number of established connections and throughput is identified and quantified.


Effectiveness of Symbol-Rate Optimization with PM-16QAM Subcarriers in WDM Transmission (W3J.3)
01:30 PM - 01:45 PM      Contributed Submission
We demonstrate up to 9% reach gain provided by symbol-rate optimization over PM-16QAM subcarriers in WDM transmission. Applying an ideal CPE, we also discuss on the potentially achievable SRO gains enabled by enhanced phase noise compensation.

Electronically Subcarrier Multiplexed PM-32QAM with Optimized FEC Overheads (W3J.4)
01:45 PM - 02:00 PM      Contributed Submission
We experimentally investigate PM-32QAM with up to 16 subcarriers per wavelength and demonstrate that at a net bitrate of 350 Gbit/s, the distance can be increased by 300 km in WDM transmission using variable rate FEC.


A Novel Post-Probabilistically-Shaped PAM Signaling as a Channel Coding for Efficient Optical Communications (W4A.2)
04:00 PM - 04:15 PM      Contributed Submission
We propose a novel post-probabilistically-shaped PAM as a simple channel coding being applicable to optical communication systems with SD-FEC. It directly controls the distribution and achieves 0.52 dB required SNR reduction with 4% incremental overhead.

A Generalized Pairwise Optimization for Designing Multi-Dimensional Modulation Formats (W4A.6)
05:00 PM - 05:15 PM      Contributed Submission
A modified pairwise optimization algorithm has been proposed to optimize N-dimensional constellation. The resulting optimized 2- and 4-dimensional 8QAM formats outperform star-8QAM by >0.4 dB at the SNR above the FEC limit in both simulation and experiments.


Optical Interconnects: Design and Analysis (W4I.1)
03:30 PM - 04:00 PM      Invited Submission
This paper focuses on design challenges and solutions for realization of low-power high-speed electronics for optical interconnects. Design methodologies for high sensitivity receivers and optimized driver circuitries at the transmitter side are presented.

Single Wavelength 100G Real-Time Transmission for High-Speed Data Center Communications (W4I.2)
04:00 PM - 04:15 PM      Contributed Submission
The first demonstration of real-time 53.125-GBd PAM-4 optical transmission over 2-km SSMF enabled by 16-nm DSP-ASIC and small-size, high-bandwidth optoelectronics is reported. Pre-FEC BER

Intra-Datacenter Links Exploiting PCI Express Generation 4 Interconnections (W4I.3)
04:15 PM - 04:30 PM      Contributed Submission
We demonstrate few-km reaches for PCIe-based optical fiber interconnections according to latency limitations, characterizing 16-Gb/s per lane Generation4 up to 10 km and confirming the Generation3 compliance of 2-km links employing suitable PCIe cards.

EML-based IM/DD 400G (4x112.5-Gbit/s) PAM-4 over 80 km SSMF Based on Linear Pre-Equalization and Nonlinear LUT Pre-Distortion for Inter-DCI Applications (W4I.4)
04:30 PM - 04:45 PM      Contributed Submission
We experimentally demonstrated EML-based IM/DD 4x112.5-Gbit/s PAM-4 transmission over 80km SSMF for inter-DCI applications. Thanks to the transmitter-side DSP based on linear pre-equalization and nonlinear look-up-table pre-distortion, the performances are significantly improved.


TDECQ (Transmitter Dispersion Eye Closure Quaternary) Replaces Historic Eye-mask and TDP Test for 400 Gb/s PAM4 Optical Transmitters (W4D.1)
03:30 PM - 03:45 PM      Contributed Submission
For PAM4 transmission in 400 Gb/s Datacom networks, use of equalization and FEC, and a need to reduce cost, force a replacement of historic eye-mask and TDP tests. We describe that replacement: TDECQ.

56Gb/s Chirp-managed Symbol Transmission with Low-cost, 10-G Class LD for 400G Intra-data Center Interconnection (W4D.2)
03:45 PM - 04:00 PM      Contributed Submission
We have demonstrated up to 56-Gb/s cost-efficient transmission for data center interconnection over 10-km SMF-28 with negative power penalty. This 56-Gb/s transmitter comprises a low-cost 10-G-class directly-modulated distributed-feedback laser without requiring any expensive DAC, ADC and power-consumptive DSP.

Real-Time 200 Gb/s (4x56.25 Gb/s) PAM-4 Transmission over 80 km SSMF using Quantum-Dot Laser and Silicon Ring-Modulator (W4D.3)
04:00 PM - 04:15 PM      Contributed Submission
We report real-time 4x56.26-Gb/s DWDM PAM-4 transmission over 80-km SSMF with novel optical transmitter sub-assembly comprising multi-wavelength quantum-dot laser and silicon ring modulators. Pre-FEC BERs below 1E-4 are achieved after 80-km, allowing error-free operation with HD-FEC.

Demonstration and Performance Analysis of 4 Tb/s DWDM Metro-DCI System with 100G PAM4 QSFP28 Modules (W4D.4)
04:15 PM - 04:30 PM      Contributed Submission
We demonstrate a 4-Tb/s metro-DCI system with commercial QSFP28 modules (40x100G dual-wavelength 56-Gb/s PAM4). We detail system performance over 80km and quantify tolerance to chromatic dispersion and nonlinearity over a wide range of fiber types.

PAM4 Signaling for intra-data center and Data center to data center connectivity (DCI) (W4D.5)
04:30 PM - 05:30 PM      Tutorial Submission
We review challenges in digital signal processing techniques for PAM4 intra-data center and data center interconnect applications. DSP & FEC techniques for PAM4 direct-detection transceiver IC that achieves 100Gbps in 28nm CMOS process for 80km DWDM Data Center Interconnect (DCI) in a QSFP28 form factor will be discussed.


Design Considerations for a Digital Subcarrier Coherent Optical Modem (Th1D.1)
08:00 AM - 08:30 AM      Invited Submission
Subcarrier modulation is shown to provide a number of system benefits including complexity savings in dispersion compensation, Kerr nonlinearity mitigation and flexibility in spectral efficiency. Design considerations are discussed.

Lessons Learned from CFP2-ACO System Integrations, Interoperability Testing and Deployments (Th1D.4)
09:00 AM - 09:30 AM      Invited Submission
We discuss the key metrics of analog coherent interfaces for today’s 200G 16QAM and future 400-600G 64QAM pluggable systems. A cloud service provider perspective on next generation DCI requirements is also discussed.


1.25-2.5Gbps Cost-Effective Transceiver Based on Directly Phase Modulated VCSEL for Flexible Access Networks (Th1K.4)
09:15 AM - 09:30 AM      Contributed Submission
A 1.25-2.5Gbps cost-effective transceiver based on DPSK directly phase modulated VCSEL and a heterodyne receiver with a VCSEL as LO is proposed. The proposed transmitter sensitivity is -43.5dBm for 1.25Gbps and -40.5dBm for 2.5Gbps.

Performance Evaluation of CPFSK Transmitters for TDM-Based Digital Coherent PON Upstream (Th1K.5)
09:30 AM - 09:45 AM      Contributed Submission
Two burst-mode CPFSK transmitters using directly-modulated DFB-LDs are proposed and high receiver sensitivities of -44.0 dBm and -45.0 dBm are measured in experiments, both of which are record values for 10-Gb/s CPFSK signals.

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