A method for improving the accuracy of optical signal-to-noise ratio osnr in wavelength division multiplexing system

Abstract

The invention is applicable to the field of optical communications, and provides a method for improving the accuracy of an OSNR (Optical Signal to Noise Ratio) of a wavelength division multiplexing system. On an application occasion of the wavelength division multiplexing system, particularly on an application occasion of a system having a small number of channels, less than 10 channels, by testing signal optical power and noise optical power of a tested channel at the output end of a Raman fiber amplifier or an erbium-doped fiber amplifier at a system receiving end, by adopting a noise function and a correction factor, an OSNR of each channel of the wavelength division multiplexing system is acquired according to the measured signal optical power and noise optical power. By the adoption of the method, the OSNR of each channel of the wavelength division multiplexing system can be accurately extracted, and a test error can be reduced, so that the reliability and the stability of the wavelength division multiplexing system are effectively improved.

Description

technical field [0001] The invention belongs to the field of wavelength division multiplexing optical communication, in particular to a method for improving the accuracy of the optical signal-to-noise ratio (OSNR) of a wavelength division multiplexing system. Background technique [0002] With the wide-scale application of WDM systems, one of the key performance indicators of WDM systems, the optical signal-to-noise ratio (OSNR), can reflect the transmission quality of signal light very intuitively and clearly, and it can better evaluate business The transmission quality after passing through the transmission channel. [0003] The traditional method of detecting OSNR is to calculate OSNR by in-band signal and out-of-band ASE noise. The optical power of the in-band signal is the total in-band power of the channel minus the optical power of the in-band ASE noise. The in-band ASE noise optical power is measured by turning off the channel; There are certain errors in the metho...

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Problems solved by technology

[0004] In view of the above problems, the object of the present invention is to propose a method for the accuracy of the optical signal-to-noise ratio (OSNR) of a wavelength division multiplexing system, aiming to solve the problem that the existing OSNR test method is applied to the wavelength division multiplexing system below 10 channels. Technical issues with accuracy

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