POLARIZATION SEPARATOR, AND OPTICAL RECEIVER

摘要

PROBLEM TO BE SOLVED: To efficiently obtain a control signal required for separating a polarization even when polarization relationships among respective frequencies are broken by the effect of a PMD in a polarization separator separating the polarization of a polarized multiplex optical signal.

SOLUTION: The polarization separator has a polarization control unit 2 controlling the polarization state of the input polarized multiplex optical signal, and a polarization separator 3 polarization-separating the polarized multiplex optical signal output from the polarization control unit 2 into two light signals. Such a polarization separator has a narrow-band optical filter 8 extracting an optical output contained in a frequency band in the vicinity of an optical carrier by using either one branch output of two light signals separated by the polarization separator 3, and an orthogonal-relationship monitor 5 generating an error signal for separating the polarization on the basis of the polarization state of the extracted optical signal. Such the polarization separator further has a driver circuit 4 generating the control signal for controlling the polarization control unit 2 by using the error signal output from the orthogonal-relationship monitor 5.

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