title: Flat-topped and low loss silicon-nanowire-type optical MUX/DeMUX employing multi-stage microring resonator assisted delayed Mach-Zehnder interferometers.
abstract: 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.
authors.affiliation: Fujitsu Laboratories Ltd., 10-1 Morinosato-Wakamiya, 243-0197, Japan. jeong.sh@jp.fujitsu.com
authors.forename: Seok-Hwan
authors.initials: SH
authors.lastname: Jeong
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Tanaka
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Akiyama
authors.forename: Shigeaki
authors.initials: S
authors.lastname: Sekiguchi
authors.forename: Yu
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Ken
authors.initials: K
authors.lastname: Morito