title: Birefringent Branching Filters for Wideband Optical FDM Communications.
abstract: Optical branching filters consisting of birefringent filters for combining and splitting eight optical channels are studied in detail both theoretically and experimentally. Multisegment structures were used in the channel-splitting filter to suppress the crosstalk from other channels. The crosstalk of -15.5 dB was realized for a signal bandwidth B(in) equal to 67.5% of the channel separation. Discussions on the pulse response of the filter system, effects of nonzero extinction ratio, and influences of the filter frequency detuning are included.
authors.forename: T
authors.initials: T
authors.lastname: Kimura
authors.forename: M
authors.initials: M
authors.lastname: Saruwatari
authors.forename: K
authors.initials: K
authors.lastname: Otsuka