InP-Based Monolithically Integrated Photodetectors for Compact Coherent Receivers

Hideki YAGI  Takuya OKIMOTO  Masaru TAKECHI  Yoshihiro YONEDA  

C - Abstracts of IEICE TRANSACTIONS on Electronics (Japanese Edition)   Vol.J101-C   No.3   pp.124-131
Publication Date: 2018/03/01
Online ISSN: 1881-0217
Type of Manuscript: INVITED PAPER
digital coherent transmission,  InP,  90° hybrid,  multimode interference structure,  45° phase shifter,  p-i-n-photodiode,  

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Digital coherent transmission has been applied to not only long-haul networks but also metro networks. As a result, high port density with downsizing of optical components including a coherent receiver is indispensable for metro applications. We have demonstrated the high responsivity and highly reliable operation of InP-based photodetectors monolithically integrated with the 90° hybrid using butt-joint regrowth. To achieve over 400 Gb/s coherent transmission systems, a wide bandwidth for 64 GBaud and high responsivity needed in compact and low power dissipation transceivers are required as a p-i-n-photodiode design. In this paper, we review InP-based photodetectors monolithically integrated with the 90° hybrid for 100/200 Gb/s compact coherent receivers and report 3 dB bandwidth of more than 46 GHz and high responsivity operation of photodetectors for 64 GBaud operation.