Forward error correction codes for digital optical network optimization
AssigneeCiena Corporation
InventorChris Barnard
Life of this patent
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Abstract
A network optimization method measures the line bit error rate (BER) at a receiver by counting forward error correction corrected errors, and adjusts network parameters to minimize the corrected error rate. Adjustable parameters include, among other things, transmitter extinction ratio, transmitter polarization, and dispersion. The method includes sweeping an adjustable parameter while monitoring the FEC corrected bit error rates at the receiver, and then extrapolating an optimum value of the parameter. In this way, the corrected BER can be maintained below the predetermined BER limit while the digital communication network is in-service.
Claims23
A method of optimizing a digital communication network having a transmitter, a receiver, and a variable parameter, said method comprising:
- encoding forward error correction (FEC) at said transmitter;
- adjusting said variable parameter;
- decoding the FEC and monitoring corrected FEC errors at said receiver during adjustment of said variable parameter;
- and
- extrapolating said variable parameter to a value that substantially minimizes the corrected FEC errors.
A system for optimizing a digital communication network, comprising:
- a transmitter configured to encode forward error correction (FEC);
- means for adjusting a variable parameter associated with the digital communication network;
- a receiver, which includes
- means for decoding said FEC encoded by the transmitter, and
- means for monitoring corrected FEC errors while said variable parameter is adjusted to determine a correlation;
- and
- means for calculating a value of said variable parameter, based on said correlation, which substantially minimizes corrected FEC errors.
A method for adjusting parameters in a digital communication network, comprising:
- decoding forward error correction (FEC) at a receiver while adjusting a variable parameter, said FEC being encoded at a transmitter;
- monitoring corrected forward error correction (FEC) errors at said receiver to determine a correlation between said corrected FEC errors and said adjustments to said variable parameter;
- and
- calculating a value of said variable parameter based on said correlation to substantially minimize said corrected FEC errors.
Dependencies are inferred from the claim text.