On-chip 1 by 8 coarse wavelength division multiplexer and multi-wavelength source on ultra-silicon-rich nitride

• Published in: Optics express Vol. 27; no. 16; pp. 23549 - 23557
• Main Authors: Chen, George Feng Rong, Choi, Ju Won, Sahin, Ezgi, Ng, Doris Keh Ting, Tan, Dawn T H
• Format: Journal Article
• Language: English
• Published: United States 05.08.2019
• ISSN: 1094-4087; 1094-4087
• DOI: 10.1364/OE.27.023549

An 8-channel coarse wavelength division multiplexer (CWDM) based on coupled vertical gratings has been designed, fabricated and characterized. The devices are implemented on the ultra-silicon-rich nitride (USRN) platform. The demonstrated device possesses 8 CWDM channels. The absence of free spectral range (FSR) enabled the overall multiplexed bandwidth to span across the S + C + L bands. The CWDM channels meet the specifications stipulated by the International Telecommunications Union G.694.2 standard. The average channel crosstalk is -25dB. Pseudo-Random Bit Sequence 2 -1 Non-Return-Zero data at 30Gb/s was launched into the device and a clear eye diagram was obtained. The device was further used with a USRN waveguide generating supercontinuum to create a multi-wavelength source emitting light at 8 CWDM wavelengths.