For further information, please contact the General chair: Tohru Ishihara
A path to 1Tb/s Coherent Optical Modem: From Silicon to Light
Networking traffic is increasing exponentially, driven by high-definition video streaming, 5G wireless, and cloud computing. DSP-based coherent optical modems are necessary to fully exploit the capacity of fiber channels. Transport capacity can be improved through increases in bit rate, spectral efficiency, and the application of multi-carrier bundles. Physical impairments due to noise, nonlinearity, optical filtering, chromatic dispersion, and polarization mode dispersion are barriers to achieving reach with high capacity signals. Coherent detection provides linear access to the amplitude and phase of the optical electric field and so allows linear digital filtering to directly compensate those linear impairments. Conversion from digital to analog domain enables coherent optical transceiver. DACs at the transmitter allows DSP for equalization and the capability of a wealth of software definable modulation formats from a single transceiver. At the receiving end the complex electrical field is converted to electrical domain in a coherent receiver module. Photonic integration allows optical hybrid, detectors, and transimpedance amplifiers to be co-packaged in a single module. Silicon photonics coherent receivers are being developed which enable even more compact designs. Analog-to-digital converters (ADCs) will then convert the analog electrical signals to the digital domain for processing in the receiver DSP. Important parameters for high-speed DAC and ADC designs are: bit resolution, sample rate, signal-to-noise-plus-distortion ratio (SNDR), clock speed, jitter, and power dissipation. In this presentation we will highlight the importance and the requirements of high-speed data converter DSP and FEC in enabling coherent optical modems. An overview of the 100G/200G/400G/800G optical modem will be also provided. Finally, we conclude with the requirements of Tera bit optical modem from baud rate, sampling rate, resolution, and modulation formats.
Naim Ben-Hamida, director of hardware engineering at Ciena Corporation responsible for the development of high-speed analog IP for optical communication. His current product/project is an 800Gb/s coherent optical modem. High speed circuits designed by Dr Ben-Hamida’s team carry most of the internet content of the world. Ciena’s customers are leading telecommunication companies and internet content providers (Facebook, Google, Microsoft, …). He is currently co-supervising more than 12 PhD and MSA students covering seven research and development projects with six Canadian universities. These projects are centered around 1Tb/s optical modem using Silicon Photonic, high speed electronic and high-performance DSP in 7nm CMOS technology. He also holds an adjunct professor position with Carleton University. Naim Ben-Hamida has published more than 60 international papers and holds more than twenty patents. Prior to Ciena/Nortel, He co-founded Opmaxx Inc, a mixed signal design and test company. He held a vice president position and was part of the team who led the company to an acquisition. Dr Ben-Hamida had a PHD and MSA from Ecole Polytechnique de Montreal, and Bachelor of Science in electrical engineering from Laval university Quebec, Canada.