RECEPTION METHOD FOR FREQUENCY MULTIPLEX POLARIZED PLANE MODULATION LIGHT AND RECEIVER USED FOR IT

摘要

PURPOSE: To realize the reception method of a polarized plane modulation light in which a modulation output is obtained without fail even when an analyzer is fixed and the receiver for it. CONSTITUTION: A frequency multiplex polarized plane modulation light subject to polarized plane modulation obtained from a light propagated through an optical fiber 1 by an external optical modulator is distributed into three by a receiver side and fed to three distributed paths 3a-3c, and a polarized plane modulation light sent to one distribution path 3a is given to a 1st analyzer 5a through a π/2 phase shifter 4 and the polarized plane modulation light fed to the other two distribution paths 3b, 3c is given to 2nd and 3rd analyzers 5b, 5c not through the π/2 phase shifter 4 and an intensity modulation light passing through the analyzers 5a-5c are given to O/E converters 6a-6c, in which the light is converted into an electric signal. Then each electric signal is discriminated into a frequency component corresponding to a frequency of the external optical modulator 2 and the electric signal of any of the distribution paths 3a-3c with highest modulation output for each frequency component is selected and received.