Furukawa Electric Review No.56Narrow Spectral Linewidth Integrable Tunable Laser Assemblies for Digital Coherent Optical Communications

Hiroyuki Ishii, Akihisa Kondo, Masayoshi Kimura, Yosuke Terada, Kazuki Yamaoka, Maiko Ariga, Masayoshi Nishita, Hiroyuki Koshi, Tatsuro Kurobe

We have been developing narrow spectral linewidth integrable tunable laser assemblies used for digital coherent optical communication systems. In order to apply coherent optical communication technologies to communications for such as short distance metro areas, inter-data center, etc., a compact and low power consumption wavelength tunable laser source that can be installed in pluggable optical transceivers, etc. is required. In addition, an expansion of the wavelength bandwidth from the original C band to the extended C band and L band is required. In order to meet these requirements, we have been developing Distributed FeedBack (DFB) laser array type tunable lasers and tunable lasers monolithically integrating the Distributed Bragg Reflector (DBR) and the ring reflector. In addition, we have started to study ultra-narrow spectral linewidth tunable lasers for the next generation ultra-high speed and large capacity systems. In this paper, we will introduce the status of these developments.