Patent ID: 8000595
Filing Date: 2011-08-16
Classification: H04B

Abstract:
1. An optical receiver comprising: a demodulator converting an in-phase signal of a received differential phase modulated optical signal to a first electrical signal and converting a quadrature signal of the received differential phase modulated optical signal to a second electrical signal; a decision member deciding logic states of the first and second electrical signals; a logic controller using a decision result of the decision member to control the logic states of the first and second electrical signals; and a memory member storing information relating to the decision result of the decision member, wherein the logic controller controls the logic states using the information relating to the decision result stored by the memory member, the optical receiver further comprises a synchronization member establishing frame synchronization of the first and second electrical signals for which logic states were controlled by the logic controller; and the memory member stores information relating to the decision result when frame synchronization is established by the synchronization member.