Abstract
AbstractThe performance of coherent receivers in optical communication systems is impaired by polarization mismatchings between the received optical signal and the local laser field. One of the most effective techniques to cope with such a phenomenon is the use of polarization‐diversity receivers which, at the cost of a higher complexity in the optical front‐end and a small performance degradation, guarantee insensitivity to changes in the state of polarization of the received signal. The goal of this paper is twofold: firstly, we present here an exact theoretical analysis of balanced polarization‐diversity receivers for ASK, FSK or DPSK modulation schemes in the shot‐noise‐limited regime, deriving closed‐form expressions for the receiver Bit Error Rate (BER) of each of the cited modulations. Secondly, we assess the sensitivity of the same receivers to a slowly‐varying frequency detuning of the heterodyne laser, in order to allow for a well‐aimed design of the Automatic Frequency Control (AFC) circuit of the local laser. This work was performed in the Framework of the “Telecommunications” project funded by the Italian National Research Council (CNR).
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