Masayoshi Nishita, Noritaka Matsubara, Junichi Hasegawa, Kazuki Yamaoka, Maiko Ariga, Yusuke Inaba, Masayoshi Kimura, Masaki Wakaba, Masahiro Yoshida, Kazuomi Maruyama, Toshihito Suzuki, Hiroyuki Ishii, Yasumasa Kawakita


In the compact optical transceivers for datacenter interconnects using digital coherent technology, a compact and low power consumption wavelength tunable light source is required.
We have developed a Vernier-type monolithic integrated tunable laser chip, that uses a Distributed Bragg Reflector (DBR) and a ring resonator reflector, also have developed extremelyhigh-Δ planar lightwave circuit (extremely-high-Δ PLC) wavelength locker. By mounting them on the laser module, we have achieved a compact tunable light source Nano-ITLA with a control circuit which meets such requirements. We confirmed that, at a bit rate of 400 Gb/s, this Nano-ITLA has excellent constellation characteristics, which is an optical output of 17 dBm and a spectral linewidth of 100 kHz or less in the entire C band.

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