Abstract
AbstractIn a coherent optical fiber communication with a single‐mode fiber and an optical heterodyne detection for improved receiver sensitivity, degradations of the receiving sensitivity due to fluctuation of the polarization condition of the received light are a problem. As a possible solution to this problem, this paper proposes a polarization diversity system with an error‐detecting code or an error‐correcting code. Its characteristics are analyzed and optimum design values are obtained.When a parity‐check code with the code length N is used as an error‐detecting code, N =32 presents an optimum design. In comparison to a reference system in which an ideal polarization matching occurs and a conventional binary code is used, the SNR degradation is about 0.7 dB. In the enhanced reference system in which a single error‐correcting/double error‐detecting Hamming code (enhanced Hamming code) with a code length of N is used, N =256 provides an optimum design. Compared to the reference system, the SNR is improved by about 2.1 dB. In the present system using an enhanced Hamming code, N =64 is an optimum design and the SNR is improved by about 1.1 dB in comparison to the reference system, but is degraded by about 1.0 dB in comparison with the enhanced reference system.
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