POLARIZATION-MULTIPLEXING OPTICAL TRANSMITTER, POLARIZATION-MULTIPLEXING OPTICAL RECEIVER, POLARIZATION-MULTIPLEXING OPTICAL TRANSCEIVING SYSTEM, AND CONTROLLING METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To stably split polarization components in simple configuration.

SOLUTION: By using low-frequency signals F transmitted from a low frequency generator 20, an optical transmitting unit 21 modulates and outputs one of a wavelength, a transmission timing, and an intensity of light being a transmitted wave. A polarization multiplexer 22 combines the modulated two output light signals in polarization states orthogonal to each other and generates polarization-multiplexing signals. A polarization splitter 32 splits by extracting two orthogonal polarization components from the polarization-multiplexing signals whose polarization states are controlled by a polarization controller 31. A band-pass filter 34 extracts components transmitting through passbands from output signals of the optical receiving unit 33 and outputs an intensity of the components. Based on the intensity output from the band-pass filter 34, a controlling circuit 35 generates feedback control signals for maximizing a ratio of the components of the low-frequency signals F1 and by using the feedback control signals, the polarization controller 31 controls the polarization states of the polarization-multiplexing signals.

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