Patent ID: 9621263
Date: 2017-04-11
CPC Classifications: H04B

Claim:
1. A method for detecting an optical signal-to-noise ratio, the method comprising: receiving an optical signal carrying amplified spontaneous emission (ASE) noise; detecting a first alternating current component and a first direct current component of the optical signal; wherein the optical signal is converted into an electric signal through a photoelectric detector in an optical receiver, the electric signal output by the photoelectric detector is split into two electric signals, one electric signal is sent to a low pass filter (LPF) for signal processing to acquire the first direct current component of the optical signal, the other electric signal is sent to a band pass filter (BPF) for signal processing to acquire the first alternating current component of the optical signal; acquiring first modulation information of the optical signal; acquiring first correction information corresponding to the first modulation information according to the first modulation information; and determining an optical signal-to-noise ratio (OSNR) of the optical signal according to the first alternating current component, the first direct current component, and the first correction information.