Dispersion compensation
First Claim
1. A polarization mode dispersion (PMD) compensation arrangement for receiving an optical input data signal which has been subjected to PMD, the arrangement comprising an adaptive chromatic dispersion compensator and a first-order PMD compensator, wherein the adaptive chromatic dispersion compensator is controlled to provide compensation for both chromatic dispersion and second order PMD, and wherein a feedback loop from the output of the arrangement is used to derive control signals for controlling the adaptive chromatic dispersion compensator and the first-order PMD compensator.
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Accused Products
Abstract
A polarization mode dispersion (PMD) compensation arrangement receives an optical input data signal which has been subjected to PMD. The arrangement comprises an adaptive chromatic dispersion compensator (24) and a first-order PMD compensator (20,22) in series, wherein the adaptive chromatic dispersion compensator is controlled to provide compensation for both chromatic dispersion and second order PMD. The compensation arrangement is used in a node of an optical network.
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Citations
11 Claims
- 1. A polarization mode dispersion (PMD) compensation arrangement for receiving an optical input data signal which has been subjected to PMD, the arrangement comprising an adaptive chromatic dispersion compensator and a first-order PMD compensator, wherein the adaptive chromatic dispersion compensator is controlled to provide compensation for both chromatic dispersion and second order PMD, and wherein a feedback loop from the output of the arrangement is used to derive control signals for controlling the adaptive chromatic dispersion compensator and the first-order PMD compensator.
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9. A method of providing polarization mode dispersion (PMD) compensation comprising:
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using an adaptive chromatic dispersion compensator to compensate for chromatic dispersion and second-order PMD; and
using a first-order PMD compensator to compensate for first order PMD, wherein the adaptive chromatic dispersion compensator and the first-order PMD compensator are controlled by a single feedback control loop.
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10. A node for an optical communications system, comprising an optical switching arrangement for routing signals through the node, the node further comprising a polarization mode dispersion (PMD) compensation arrangement for receiving an optical input data signal which has been subjected to PMD, the arrangement comprising an adaptive chromatic dispersion compensator and a first-order PMD compensator, wherein the adaptive chromatic dispersion compensator is controlled to provide compensation for both chromatic dispersion and second order PMD, and wherein a feedback loop from the output of the arrangement is used to derived control signals for controlling the adaptive chromatic dispersion compensator and the first-order PMD compensator.
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11. An optical communications system comprising a plurality of nodes, each node comprising an optical switching arrangement for routing signals through the node, the node further comprising a polarization mode dispersion (PMD) compensation arrangement for receiving an optical input data signal which has been subjected to PMD, the arrangement comprising an adaptive chromatic dispersion compensator and a first-order PMD compensator, wherein the adaptive chromatic dispersion compensator is controlled to provide compensation for both chromatic dispersion and second order PMD, and wherein a feedback loop from the output of the arrangement is used to derive control signals for controlling the adaptive chromatic dispersion compensator and the first-order PMD compensator.
Specification