Disclosed is a DPSK optical receiver capable of compensating for a polarization phase difference. The DPSK optical receiver according to an embodiment of the present disclosure includes: an optical splitter configured to split a received optical signal into a first optical signal and a second optical signal; an optical delay waveguide configured to delay the first optical signal; a birefringent waveguide configured to delay the second optical signal so as to compensate for a polarization phase difference at an output end; and an optical hybrid configured to generate an optical detection signal corresponding to a phase difference between the delayed first optical signal and the delayed second optical signal.