Systems and methods for optical signal-to-noise ratio monitoring
AssigneeHuawei Technologies Co., Ltd.
InventorsZhiping Jiang, Xuefeng Tang
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Abstract
A system for monitoring optical signal-to-noise ratio (OSNR) is provided. In some specific examples, the system may use a pilot tone power of a signal modulated with pilot tone to derive the pure signal power and the variance of the whole electric field to derive the total power (pure signal power plus amplified spontaneous emission (ASE) power of the signal). The ASE power can be obtained by subtracting the pure signal power from the total power (ASE+pure signal). Once the ASE power and the pure signal power are known, the OSNR can be calculated.
Claims20
A method of monitoring optical signal-to-noise ratio (OSNR) in an optical communication network in an online manner, the method comprising:
- receiving an optical signal at the optical communication network, wherein the signal is modulated with pilot tone;
- measuring a total signal power of the signal, wherein the total signal power includes a pure signal power and an amplified spontaneous emission (ASE) power;
- calculating a variance value of an electrical field of the signal;
- detecting a pilot tone power of the signal to derive the pure signal power;
- calculating the ASE power using the variance value and the pure signal power;
- and
- calculating the OSNR by dividing the total signal power by the ASE power in 0.1 nm bandwidth.
A system for monitoring optical signal-to-noise ratio (OSNR) in an optical communication network, the system comprising:
- a processor;
- and
- a memory coupled to the processor, the memory storing instructions, which when executed by the processor, cause the system to perform operations including:
- receiving a signal at the optical communication network, wherein the signal is modulated with pilot tone;
- measuring a total signal power of the signal, wherein the total signal power includes a pure signal power and an amplified spontaneous emission (ASE) power;
- calculating a variance value of an electrical field of the signal;
- detecting a pilot tone power of the signal to derive the pure signal power;
- calculating the ASE power using the variance value and the pure signal power;
- and
- calculating the OSNR by dividing the total signal power by the ASE power in 0.1 nm bandwidth.
Dependencies are inferred from the claim text.