title: Silica-based, compact and variable-optical-attenuator integrated coherent receiver with stable optoelectronic coupling system.
abstract: We demonstrate a compact and variable-optical-attenuator (VOA) integrated coherent receiver with a silica-based planar lightwave circuit (PLC). To realize the compact receiver, we integrate a VOA in a single PLC chip with polarization beam splitters and optical 90-degree hybrids, and employ a stable optoelectronic coupling system consisting of micro lens arrays and photodiode (PD) subcarriers with high-speed right-angled signal lines. We integrate a VOA and a coherent receiver in a 27x40x6 mm package, and successfully demodulate a 128-Gbit/s polarization division multiplexed (PDM) quadrature phase shift keying (QPSK) signal with a VOA-assisted wide dynamic range of more than 30 dB.
authors.affiliation: NTT Photonics Laboratories, NTT Corporation, Atsugi, Kanagawa, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Tsunashima
authors.forename: Fumito
authors.initials: F
authors.lastname: Nakajima
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Nasu
authors.forename: Ryoichi
authors.initials: R
authors.lastname: Kasahara
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Nakanishi
authors.forename: Takashi
authors.initials: T
authors.lastname: Saida
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamada
authors.forename: Kimikazu
authors.initials: K
authors.lastname: Sano
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Hashimoto
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Fukuyama
authors.forename: Hideaki
authors.initials: H
authors.lastname: Nosaka
authors.forename: Koichi
authors.initials: K
authors.lastname: Murata
mesh_terms: D004867:Equipment Design; D005336:Fiber Optic Technology / Q000295:instrumentation*; D008872:Microwaves; D055096:Optical Devices; D055100:Optical Fibers; D012815:Signal Processing, Computer-Assisted; D012822:Silicon Dioxide / Q000737:chemistry*; D013685:Telecommunications / Q000295:instrumentation*; D014159:Transducers
chemical_list: D012822:Silicon Dioxide