Apparatus and method for monitoring optical performance parameter, and optical transmission system

A method for monitoring an optical performance parameter, the method comprising:

• performing coherent synthesis on a detecting optical signal and a multi-wavelength local oscillation laser beam comprising multiple wavelengths;
• converting a coherent receiving signal formed by means of the coherent synthesis into an analog electrical signal;
• acquiring the analog electrical signal, and converting the analog electrical signal into a digital signal;
• processing the digital signal to generate a continuous full power spectrum of the detecting optical signal, including
• performing Fourier transformation on the digital signal to generate continuous power spectra in multiple different frequency bands corresponding to the multi-wavelength local oscillation laser beam of the detecting optical signal,
• generating a discrete full power spectrum of the detecting optical signal according to the continuous power spectra in the multiple different frequency bands, and
• generating the continuous full power spectrum of the detecting optical signal according to the discrete full power spectrum of the detecting optical signal by using an interpolation algorithm;
• and
• monitoring, according to the continuous full power spectrum, an optical performance parameter of a transmission link carrying the detecting optical signal.

A non-transitory computer-readable storage medium having a program recorded thereon, wherein the program, when executed by a computer, causes the computer to provide at least the following operations:

• perform coherent synthesis on a detecting optical signal and a multi-wavelength local oscillation laser beam comprising multiple wavelengths;
• convert a coherent receiving signal formed by means of the coherent synthesis into an analog electrical signal;
• acquire the analog electrical signal, and converting the analog electrical signal into a digital signal;
• process the digital signal to generate a continuous full power spectrum of the detecting optical signal, including
• perform Fourier transformation on the digital signal to generate continuous power spectra in multiple different frequency bands corresponding to the multi-wavelength local oscillation laser beam of the detecting optical signal,
• generate a discrete full power spectrum of the detecting optical signal according to the continuous power spectra in the multiple different frequency bands, and
• generate the continuous full power spectrum of the detecting optical signal according to the discrete full power spectrum of the detecting optical signal by using an interpolation algorithm;
• and
• monitor, according to the continuous full power spectrum, an optical performance parameter of a transmission link carrying the detecting optical signal.