Patent ID: 6775426
Filing Date: 2004-08-10
Classification: H04B

Abstract:
A polarization mode dispersion compensating device, comprising:a polarization mode dispersion equalizer configured to receive an input optical signal propagated through an optical fiber, and output a polarization mode dispersion compensated optical signal by compensating a polarization mode dispersion of the input optical signal such that a difference between transmission delays of a TE polarization component and a TM polarization component of the input optical signal becomes minimum; a polarization component splitting unit configured to receive the polarization mode dispersion compensated optical signal outputted from the polarization mode dispersion equalizer, and split a part of the polarization mode dispersion compensated optical signal into the TE polarization component and the TM polarization component; an optical XOR circuit configured to receive the TE polarization component and the TM polarization component split by the polarization component splitting unit separately at two input ports through an identical optical path length, and output a logical operation result of an optical XOR operation on the TE polarization component and the TM polarization component entered at the two input ports; and a control system configured to control compensation by the polarization mode dispersion equalizer such that the logical operation result outputted by the optical XOR circuit becomes â€œ0â€ .