Furukawa Electric Review No.54Integrated Coherent Transmit-Receive Optical Sub-Assembly (IC-TROSA) for Data Center Interconnects

Kazuya Nagashima, Yozo Ishikawa, Atsushi Izawa, Masayoshi Nishita, Noritaka Matsubara Hiroyuki Ishii, Thanakit Saeyang, Masaki Kotoku

There is a strong demand for highly integrated optical modules that can be incorporated into a small coherent optical transceiver to provide a high data rate density in next-generation metro area networks and data center interconnects. This paper presents a tiny Integrated Coherent Transmit-Receive Optical Sub-Assembly (IC-TROSA) that integrates a wavelength-tunable laser, an indium phosphide (InP)-based transmitter, and a planar lightwave circuit (PLC)-based receiver. Electrical-to-optical (E/O) and optical-toelectrical (O/E) bandwidths measure > 40 GHz, which is wide enough to support ≥ 400 Gb/s operations.