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 $2:6\mathrm{MMI}$ coupler, phase shifters, and $2:2\mathrm{MMI}$ couplers with an asymmetric splitting ratio of $72:28$ exhibited hexagonal phase response over a C-band range.

© 2011 Optical Society of America

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