Optical communications – Transmitter and receiver system – Including polarization
Reexamination Certificate
2002-04-18
2008-07-22
Phan, Hanh (Department: 2613)
Optical communications
Transmitter and receiver system
Including polarization
C398S147000, C398S158000, C398S159000, C398S161000, C398S065000, C398S102000, C398S079000, C398S081000, C398S148000, C385S011000, C385S024000, C385S025000, C385S031000, C385S027000, C356S073100
Reexamination Certificate
active
07403717
ABSTRACT:
Method and apparatus for compensating for first-order Polarization Mode Dispersion in an optical transmission system. An apparatus has a polarization controller for transforming polarization components of an optical signal carried by the optical fiber into orthogonal polarization states, a variable delay line for introducing a variable differential time delay between the polarization states and for producing an output optical signal that is compensated for PMD in the optical fiber, and a feedback unit for adjusting the polarization controller and the variable delay line to compensate for variations in the PMD of the optical fiber, the feedback unit including apparatus for generating a plurality of independent control signals to independently control actuators of the polarization controller and the variable delay line. The invention provides for a reduction in response time of the actuators and a reduction in complexity of an algorithm used to control the apparatus.
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Standard Search Report as completed by the ISA/EP on Dec. 13, 2002, in connection with U.S. Appl. No. 10/125,759, filed on Apr. 18, 2002.
Optics Communications 182 (2000) 135-141, Aug. 1, 2000, “Comparison of PMD-compensation techniques at 10 Gbit/s using an optical first-order compensator and electrical transversal filter”, T. Merker, N. Hahnenkamp and P. Meissner, 7 pgs.
de Faria Giancarlo Vilela
Linares Luis Carlos Blanco
von der Weid Jean Pierre
Cameron Michael
Phan Hanh
Telefonaktiebolaget LM Ericsson (publ)
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