Compact 8-wavelength receiver optical sub-assembly with a low-loss AWG demultiplexer for 400-gigabit datacom

A compact receiver optical sub-assembly (ROSA) for 8-wavelength 400-gigabit links was developed. Wavelength scalability of the ROSA with high responsivity of 0.7 A/W was achieved with a low-loss multimode-output arrayed waveguide grating.

Introduction

Datacom internet traffic is rapidly growing with the big demand for cloud computing, video streaming, and mobile services. For the standardization of 400-gigabit (400G) Ethernet, the IEEE is currently discussing its wavelength allocation and modulation format and is considering 10-km link using 8A WDM by scaling up WDM for 100G Ethernet¹.