US Patent 10554300 Optical communications
Patent 10554300 was granted and assigned to British Telecommunications Public Limited Company on February, 2020 by the United States Patent and Trademark Office.
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The present invention provides a method of indirectly determining the optical signal-noise ratio of an optical fibre communications link. In a test environment, the relationship between OSNR and pre-FEC BER (forward error-corrected bit error rate) is determined for a particular type of optical transponder. When a transponder of that type is connected to an optical communications link then the pre-FEC BER can be measured and the OSNR inferred from the pre-determined OSNR-BER relationship. The OSNR value can then be used to select a transponder modulation format or other transmission parameters.
US Patent 10554300 Optical communications
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