Optical 60° hybrid for demodulating six-level DPSK signal
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1Fujitsu Laboratories Ltd., Atsugi, Japan. jeong.sh@jp.fujitsu.com
Optics Letters
|February 2, 2011
Abstract:
We propose and demonstrate an optical 60° hybrid for demodulating optical signals with six-level DPSK modulation format. The proposed device consisting of a paired-interference 2∶6MMI coupler, phase shifters, and 2∶2MMI couplers with an asymmetric splitting ratio of 72∶28 exhibited hexagonal phase response over a C-band range.
