title: Temperature insensitive and ultra wideband silica-based dual polarization optical hybrid for coherent receiver with highly symmetrical interferometer design.
abstract: To extend the operation wavelength range of dual-polarization optical hybrids (DPOH), we propose a highly symmetrical interferometer design for a polarization beam splitter and an optical hybrid to reduce temperature and wavelength dependence. The design successfully decreases this dependence, and a fabricated DPOH with silica-based planar lightwave circuits provides temperature-insensitive performance with a polarization extinction ratio of over 25 dB and phase errors of less than 3 degrees over the entire C- and L-bands.
authors.affiliation: NTT Photonics Laboratories, NTT Corporation, 3-1, Morinosato-Wakamiya, Atsugi-shi, Kanagawa, Japan. nasu.yusuke@lab.ntt.co.jp
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Nasu
authors.forename: Takayuki
authors.initials: T
authors.lastname: Mizuno
authors.forename: Ryoichi
authors.initials: R
authors.lastname: Kasahara
authors.forename: Takashi
authors.initials: T
authors.lastname: Saida