Deliberate signal degradation for optimizing receiver control loops
First Claim
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1. A method adapted for use at a receiver, the method comprising:
- determining a bit error rate (BER) associated with a received optical signal;
providing an indication of said BER to a control loop, wherein the control loop is adapted to adjust the optical signal in a manner tending to reduce the BER; and
adapting the received optical signal in a manner tending to increase the BER such that the control loop operates within an active control region, wherein adapting the received optical signal in a manner tending to increase the BER comprises adjusting at least one control parameter at the receiver, wherein the at least one control parameter comprises at least one of;
a decision threshold; and
at least one feedback control for adapting at least one of sampling phase, chromatic dispersion, and polarization mode dispersion.
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Abstract
Techniques to control an optical receiver having a control loop using Bit Error Rate (BER). In one implementation, a bit error rate (BER) associated with a received optical signal is determined. Indication of the BER to a control loop adapted is provided to adjust the optical signal in a manner tending to reduce the BER. The received optical signal is adapted in a manner tending to increase the BER such that the control loop operates within an active control region.
40 Citations
19 Claims
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1. A method adapted for use at a receiver, the method comprising:
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determining a bit error rate (BER) associated with a received optical signal; providing an indication of said BER to a control loop, wherein the control loop is adapted to adjust the optical signal in a manner tending to reduce the BER; and adapting the received optical signal in a manner tending to increase the BER such that the control loop operates within an active control region, wherein adapting the received optical signal in a manner tending to increase the BER comprises adjusting at least one control parameter at the receiver, wherein the at least one control parameter comprises at least one of; a decision threshold; and at least one feedback control for adapting at least one of sampling phase, chromatic dispersion, and polarization mode dispersion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method adapted for use in an optical receiver normally providing an indication of a bit error rate (BER) associated with a received optical signal, the BER indication adapted for use by a control loop, the control loop having associated with it an active control region, the method comprising:
adapting, at the optical receiver, at least one parameter of the received optical signal to increase the BER such that the control loop operates within the active control region, wherein the at least one parameter comprises at least one of; a decision threshold; and at least one feedback control for adapting at least one of sampling phase, chromatic dispersion, and polarization mode dispersion. - View Dependent Claims (10, 11, 12, 13)
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14. In an optical data transmission system wherein data transmitted to an optical receiver via an optical network is adapted via a control mechanism with at least one control loop in response to a bit error rate (BER) signal provided by the optical receiver, a method comprising:
adjusting, at said receiver, at least one parameter of a received data signal to cause the BER associated with the received data signal to be degraded such that the at least one control loop operates within an active control region, wherein the at least one parameter comprises a decision threshold. - View Dependent Claims (15, 16, 17, 18, 19)
Specification