Low-loss and low-crosstalk 8 x 8 silicon nanowire AWG routers fabricated with CMOS technology

Jing Wang, Purdue University, Birck Nanotechnology Center, Chinese Academy of Sciences
Zhen Sheng, Chinese Academy of Sciences
Le Li, Grace Semicond Mfg Corp
Albert Pang, Grace Semicond Mfg Corp
Aimin Wu, Chinese Academy of Sciences
Wei Li, Chinese Academy of Sciences
Xi Wang, Chinese Academy of Sciences
Shichang Zou, Chinese Academy of Sciences, Grace Semicond Mfg Corp
Minghao Qi, Purdue University, Birck Nanotechnology Center
Fuwan Gan, Chinese Academy of Sciences

Date of this Version



Low-loss and low-crosstalk 8 x 8 arrayed waveguide grating (AWG) routers based on silicon nanowire waveguides are reported. A comparative study of the measurement results of the 3.2 nm-channel-spacing AWGs with three different designs is performed to evaluate the effect of each optimal technique, showing that a comprehensive optimization technique is more effective to improve the device performance than a single optimization. Based on the comprehensive optimal design, we further design and experimentally demonstrate a new 8-channel 0.8 nm-channel-spacing silicon AWG router for dense wavelength division multiplexing (DWDM) application with 130 nm CMOS technology. The AWG router with a channel spacing of 3.2 nm (resp. 0.8 nm) exhibits low insertion loss of 2.32 dB (resp. 2.92 dB) and low crosstalk of -20.5 similar to-24.5 dB (resp. -16.9 similar to-17.8 dB). In addition, sophisticated measurements are presented including all-input transmission testing and high-speed WDM system demonstrations for these routers. The functionality of the Si nanowire AWG as a router is characterized and a good cyclic rotation property is demonstrated. Moreover, we test the optical eye diagrams and bit-error-rates (BER) of the de-multiplexed signal when the multi-wavelength high-speed signals are launched into the AWG routers in a system experiment. Clear optical eye diagrams and low power penalty from the system point of view are achieved thanks to the low crosstalk of the AWG devices. (C) 2014 Optical Society of America


Nanoscience and Nanotechnology