Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1994-12-16
1995-12-05
Ullah, Akm E.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359156, 359122, 359182, 359189, 385 11, 385 24, H04B 1000, G02B 628
Patent
active
054734576
ABSTRACT:
A signal light which is frequency-modulated by a predetermined frequency is supplied to an optical fiber. The signal light supplied from an output end of the optical fiber is supplied to a polarization controller, from which the signal light is supplied to a polarization maintaining optical fiber. An output signal light of the polarization maintaining optical fiber is supplied to a polarization separating device, in which two orthogonal polarizations are obtained. Signal lights of the two orthogonal polarizations are received by a balanced photodetector, in which an electric signal is generated. In the electric signal, an intensity of the predetermined frequency component is detected. Then, the polarization controller is controlled to constantly minimize the intensity, so that the polarization dispersion in a transmission line is compensated to suppress the deterioration of wave-shape.
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NEC Corporation
Sanghavi Hemang
Ullah Akm E.
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