Abstract

Enabled by an autonomous calibration mechanism, crosstalk-free (−38.5 dB) fabrication-tolerant 32-ch DWDM demultiplexer on a standard Si PIC platform is demonstrated for the first time. On this platform, due to its nano-sized waveguide core dimensions, extremely precise fabrication control of waveguides has been required so far to suppress the crosstalk of demultiplexers for large-channel-count DWDM systems. This requirement made this platform impractical for such systems. To exclude this requirement, we have proposed a calibration mechanism which can be fully integrated into an assembly composed of an electric IC (EIC) and a standard Si PIC. The Si PIC has a structure of cascaded asymmetric Mach-Zehnder (AMZ) triplet consisting of AMZ interferometers designed to function as a demultiplexer. This structure enables monitoring the errors in the optical lengths of waveguides composing itself. Based on the monitored values, the controller implemented on the EIC determines the driving conditions of waveguide heaters to eliminate the errors. This feature excludes the necessity to strictly control the optical lengths in the fabrication process, making it possible to realize a crosstalk-free 32-ch DWDM demultiplexer on a standard Si PIC platform. Compatible with the vast component libraries of standard Si PIC platform, this device provides a path to ultrahigh-capacity integrated DWDM transceivers.

Cascaded AMZ triplets: a class of demultiplexers having a monitor and control scheme enabling dense WDM on Si nano-waveguide PICs with ultralow crosstalk and high spectral efficiency

Tomoyuki Akiyama, Shoichiro Oda, Yasuhiro Nakasha, Akinori Hayakawa, Shinsuke Tanaka, Yu Tanaka, and Takeshi Hoshida
Opt. Express 29(6) 7966-7985 (2021)

On-chip generation and demultiplexing of quantum correlated photons using a silicon-silica monolithic photonic integration platform

Nobuyuki Matsuda, Peter Karkus, Hidetaka Nishi, Tai Tsuchizawa, William J. Munro, Hiroki Takesue, and Koji Yamada
Opt. Express 22(19) 22831-22840 (2014)

Monolithic integration of a silica AWG and Ge photodiodes on Si photonic platform for one-chip WDM receiver

Hidetaka Nishi, Tai Tsuchizawa, Rai Kou, Hiroyuki Shinojima, Takashi Yamada, Hideaki Kimura, Yasuhiko Ishikawa, Kazumi Wada, and Koji Yamada
Opt. Express 20(8) 9312-9321 (2012)

Intra-chip optical interconnection based on polarization division multiplexing photonic integrated circuit

Yu Yu, Guanyu Chen, Chaotan Sima, and Xinliang Zhang
Opt. Express 25(23) 28330-28336 (2017)

Heterogeneously integrated widely tunable laser using lattice filter and ring resonator on Si photonics platform

Takuma Aihara, Tatsurou Hiraki, Takuro Fujii, Koji Takeda, Tai Tsuchizawa, Takaaki Kakitsuka, Hiroshi Fukuda, and Shinji Matsuo
Opt. Express 30(10) 15820-15829 (2022)