Differential phase shift keying signal integrated decoding device

The invention discloses a differential phase shift keying signal integrated decoding device, belongs to the field of optoelectronic devices, and aims to solve the problems that two optical modules, namely a decoder and an optical receiver, are needed in an existing conventional optical communication system, an optical connector is generally used for connecting the decoder and the optical receiver, and an optical signal is transmitted from the decoder to the optical receiver, so that 1dB loss is generated, and the cost is low. The integrated optical module comprises the delay line interference decoder and the optical receiver, the decoder and the optical receiver are packaged into the integrated optical module through a free space optical coupling method, the number and the size of devices are reduced after integration, and the cost is effectively reduced; in the delay line interference decoding device, the input light can be effectively and uniformly separated and combined by adopting a birefringent crystal p