[C-3_C-4] Optoelectronics / Lasers and Quantum Electronics

2:00 PM - 2:15 PM JST(5:00 AM - 5:15 AM UTC)

[C-3_C-4-22] Silicon photonic wavelength locker for heterogeneously integrated tunable lasers using coherent detection

〇Kento Komatsu¹, Takuo Hiratani¹, Hidenari Fujikata¹, Takuya Mitarai^1,2, Tsuyoshi Horikawa², Takehiko Kikuchi^1,2, Shun Kimura¹, Naoko Inoue¹, Naoki Fujiwara¹, Nobuhiko Nishiyama², Hideki Yagi¹ (1. Sumitomo Electric, 2. Science Tokyo)

Keywords:

Wavelength locker,Wavelength tunable laser,Heterogeneous integration,Silicon photonics,Coherent detection,90° hybrid,120° hybrid

A wavelength locker is an essential photonic circuit for precisely controlling the wavelength of tunable laser diodes (TLDs) used in coherent communications, creating demand for a more compact and simpler approach. For the III-V/Si heterogeneous integrated TLDs we have demonstrated, we previously proposed a monolithically integrable wavelength locker that requires no heater control, using a 90° hybrid circuit and monitoring different photodiodes depending on the target wavelength. In this work, we propose a wavelength monitoring algorithm based on the principle of coherent detection that eliminates the need to switch between photodiodes. We also report the demonstration of its operation using a 120° hybrid circuit, which reduces the number of photodiodes compared with the 90° hybrid.