• Technical Conference:  05 – 09 March 2023
  • Exhibition: 07 – 09 March 2023
  • San Diego Convention Center, San Diego, California, USA

How Will 200G (and Beyond) per Lambda IM/DD Compete with Coherent Technology?

Sunday, 06 March 16:00 – 18:30


Frank Chang, Source Photonics, USA
Hai-Feng Liu, HG Genuine, China
Sam Palermo, Texas A&M Univ., USA
Mitsuru Takenaka, Univ. of Tokyo, Japan


Ethernet speeds continue to climb up to serve the bandwidth needs by hyperscale data centers. Today, IM/DD has been extensively used in intra-data center interconnects for its lower cost/power and simplicity while coherent technology has been widely used in metro data center interconnects for its higher capacity/l and capability to compensate various link impairments. With the recent advances in DSP and photonic integration, the complexity and power consumption of coherent systems have been decreasing rapidly. As the data rate moves from 100G/l to 200G/l and beyond, the question arises as to whether IM/DD can continue to scale or migration of coherent technology into intra-data center networks is inevitable. 

This WS aims to stimulate debates on IM/DD vs. coherent detection for intra data center applications. Topics will include but not limited to:   

  • What are the viable 200G/l IM/DD technologies including approaches and modulation schemes, taking ADC/DAC, DSP, FEC, etc. into account?
  • Is higher spectral efficiency offered by coherent technology worth the extra complexity?
  • How to tailor the complexity of coherent electronics to be more competitive in terms of cost, power and latency?  
  • Are there foreseeable feasible technologies for beyond 200G/l?
  • What will be the application boundaries between IM/DD and coherent to achieve reach objectives required?  
  • What are the aspects and key trade-offs of using coherent for intra data centers?
  • Is it just simpler and better to make use of more wavelengths and more fibers?

This WS will solicit experts from data center operators, system and module vendors, and IC suppliers to share their views on those debatable issues. Interaction b/w speakers and audience through Q&A is highly encouraged.


Mark Heimbuch, Cisco, USA
Coherent Technology for Intra-Datacenter Applications

Kishore Kota, Marvell, USA
IMDD & Coherent Technology Overview Beyond 800G

Hong Liu, Google, USA
Coherent or Non-Coherent: What’s the Story?

Shinji Matsuo, NTT, Japan
Membrane DML and EAM on Si for 200G and Beyond Data Rate

Haisheng Rong, Intel, USA
Silicon Photonic Transmitter with Micro-Ring Modulator and Integrated Laser for >200Gbps per Wavelength IMDD Data Link 

Clint Schow, University of California, Santa Barbara, USA
Low-Power Analog Coherent Links at 200G/Lambda 

Martin Schell, Fraunhofer HHI, Germany
InP EMLs and Photodetectors – The Road to 200 GB/s/Lambda IMDD 

James Stewart, Meta (formerly Facebook), USA
Perspective on Coherent in the DC for 100Tbps Switch Fabrics and Beyond

Peter Winzer, Nubis Communications, USA
IMDD vs Coherent for Ultra-Dense High-Speed Interfaces

Xi Xiao, NOEIC, China
Considerations and Potential Solutions of Silicon Photonics for 200G/Lambda IMDD