Cedric F. Lam
Dr. Cedric F. Lam is currently Tech Lead Manager at Google. Before joining Google, he worked at OpVista Inc. as chief system architect, responsible for the development of an ultra-dense WDM transport system with integrated ROADM functionality. Prior to OpVista, Dr. Lam was senior technical staff member at AT&T Labs-Research. His research covers broadband optical transport and access networks architectures, optical signal modulation and transmission, passive optical network, HFC, etc. His current focus is in optical networking technologies for data center applications and Fiber-to-the-Home. Dr. Lam received B.Eng. in Electrical and Electronic Engineering from the University of Hong Kong with First Class Honors and PhD. In Electrical Engineering from UCLA
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We review state-of-the-art datacenter technologies for 800G, 1.6T and beyond interconnect speeds, focusing on 200G per-lane IM-DD (intensity modulated-direct detect) and 800G-LR1 coherent-lite transmissions.
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We review state of art datacenter interconnect technologies for 800G, 1.6T and beyond networking speeds, with a special emphases on 200G per-lane IM-DD and 800G-LR1 coherent-lite
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This is an OIF 800G LR standard contribution. This contribution proposes to revise 800G LR1 baseline link loss budget from 6dB at C-band wavelength to 8dB at O-band wavelength
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This is intended for IEEE802.3df contribution. In this contribution, we describe the FEC requirements for 800GbE/1.6TbE optics from an operator's perspective, and how to make a fair comparison among different FEC options.
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This is intended for IEEE802.3df contribution. In this contribution, we describe how to model four-wave-mixing (FWM) for datacenter interconnects systems, and why FWM could limit the achievable reach for 1.6Tb/s WDM-8 IM-DD systems
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800G LR1 Use Cases and Requirements Revisit
Optical Internetworking Forum, https://www.oiforum.com/, https://www.oiforum.com/ (2021)
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This is contribution of campus networking application requirements to the OIF 800G-LR coherent-lite project.
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This is an OFC 2022 conference panel talk. We review from high level about the right technology choice for 1.6Tb/s data center optics interconnects
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Long-Reach Wavelength-Routed TWDM PON: Technology and Deployment
Adam Edwin Taylor Barratt
Claudio DeSanti
Daoyi Wang
Joy Jiang
Junyan Geng
Liang Du
Tao Zhang
Xiangjun Zhao
Journal of Lightwave Technology (2019)
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Abstract—We present a long-reach wavelength-routed time-wavelength division multiplexing (TWDM) passive optical network (PON) architecture (LRWR-PON) and its commercial implementation, that supports up to 768 users per fiber strand and up to 50 km transmission distance. The increased reach allows central offices to become more flexible and fewer in quantity, while the increased aggregation reduces the size and number of optical cables needed, enabling smaller trenches to be
used. LRWR-PON also contains eight additional point-to-point wavelengths on each fiber to support wireless sites and/or high-speed dedicated bandwidth applications, greatly simplifying converged network designs. Multiple new optical components and modules have been developed to implement our novel architecture. These include a Cyclic Arrayed Waveguide Grating to passively aggregate and distribute access wavelengths in the field, an integrated optical amplifier and multiplexer combination device to aggregate optical line terminal (OLT) channels and extend the system reach, several dense wavelength division multiplexing OLT optics, and a colorless time- wavelength division multiplexing optical network terminal employing ultra-low cost tunable burst-mode lasers. Our analysis shows the simplification of the civil construction enabled by LRWR-PON greatly outweighs the increased optical component complexity. To date, we have conducted a successful field trial with 606 real-life customers for more than 9 months and we have been rolling out this system in new Google Fiber markets for production services.
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We discuss the trend in fiber optic technology developments to fulfill the scaling requirements of datacenter networks.
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Silicon Photonics for Optical Access Networks
Pedram Dashti
Chris Johnson
Group IV Photonics, IEEE, Washington DC (2012), pp. 3
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We highlight promising developments and directions in silicon photonics for realizing cost effective WDM-PON: photonic integration for integrated WDM transceivers at the OLT and widely tunable laser technologies for achieving a high performance, colorless ONU.
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