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

What are the Parallelization Technologies for Cost and Energy Efficient 1.6Tb Links?

Tuesday, 08 March 14:00 – 16:00


Tomoyuki Akiyama, Fujitsu Limited, Japan
Long Chen, Cisco Systems, USA
Gloria Hoefler, Pacific Biosciences, Inc., USA
Zuowei Shen, Google LLC, USA


The deployment of 400G optics is ramping up quickly. On the short reach side, the direct-detection 100G/lambda PAM4 in parallel (DR4) or CWDM (FR4) are implemented at low cost and high energy efficiency with either EMLs or silicon photonic transmitters. On the longer reach side, 400G ZR / ZR+ / Open ROADM coherent pluggables bring fast, streamlined network architectures to hyperscale data centers and carriers. The next generation 800G PAM4 optics with DR8 is expected to deploy next year, followed by 800G coherent solutions.

What would the generation of 1.6T optics look like? One frequently cited viewpoint is that as the data rate goes up, coherent becomes more advantageous because of its higher link margin. Would simplified coherent, or coherent light, become energy efficient to compete against direct-detection in short reach? For coherent, 1x 1.6Tb, 2x800G, 4x400G, which one is more cost and energy efficient? For direct-detect, would the 200G/lambda still be PAM4, or higher format such as PAM6 at lower baud rate? Would it be 8 parallel fibers, or a mixture of parallel fibers and CWDM (2xCWDM4 or 1xCWDM8)? Also, as the chip-to-chip interconnects gain more visibility, what would the optics look like for ultimate efficiency?

The panelists would share their viewpoints on these topics and open discussion with the audience.  


Xiang Zhou, Google, USA
1.6Tb/s Data Center Optics: Is Coherent the Right Choice?

Arash Farhoodfar, Marvell, USA
Advanced DSPs Enable Next Generation Low Power Optical Connectivity

Oliver Sun, Innolight, China
1.6T optics for Next Generation DC

Vasudevan Parthasarathy, Broadcom, USA
1.6Tb/s Coherent Modules for Intra data center: Challenges and Directions for Low Power

Hongbin Zhang, Cisco, USA
1.6T SiPh Coherent Solution for Intra Data Center Interconnection

Sergey Shumarayev, Intel, USA
Going Back to Basics with Co-Packaged Optical Connectivity

Bardia Pezeshki, Avicena Tech, USA
Dense Spatially Multiplexed-Lanes for Short Reach Optics Using Incoherent Optical Sources