Open AccessFlat-topped and low loss silicon-nanowire-type optical MUX/DeMUX employing multi-stage microring resonator assisted delayed Mach-Zehnder interferometers
Author(s) -
Seok−Hwan Jeong,
Shinsuke Tanaka,
Tomoyuki Akiyama,
Satoshi Sekiguchi,
Yu Tao,
Ken Morito
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.026000
Subject(s) - astronomical interferometer , resonator , multiplexer , insertion loss , materials science , optics , demultiplexer , mach–zehnder interferometer , silicon nitride , wavelength division multiplexing , multiplexing , optoelectronics , interferometry , silicon , physics , telecommunications , wavelength , computer science
We propose a novel silicon-nanowire-type multiplexer (MUX) / demultiplexer (DeMUX) based on multi-stage microring resonator assisted delayed Mach-Zehnder interferometers. It is theoretically shown that spectral flatness of DeMUX spectra can be accomplished by incorporating nonlinear phase behaviors of microring resonators into the multi-stage delayed Mach-Zehnder interferometers. We experimentally demonstrate flat-topped 400GHz-spacing 1 × 4Ch demultiplexing operation in the fabricated device with silicon-nanowire waveguides. Furthermore, by integrating the micro-heaters on the top cladding layer of the fabricated device, the DeMUX performance is upgraded in terms of excess loss (<0.8dB) and crosstalk (<-10dB) without any degradation of filter spectral flatness at each channel grid.