Optical signal to noise ratio (OSNR) detecting method, system and equipment

Abstract

The invention discloses an optical signal to noise ratio (OSNR) detecting method. The method comprises the steps that a wavelength label signal is loaded in an optical signal by a wavelength label loading end, the loading-modulating depth of the wavelength label signal is transmitted to an OSNR detecting end by a wavelength label channel or an optical monitoring channel; the OSNR detecting end obtains the loading-modulating depth of the wavelength label signal loaded in each wavelength optical signal; the wavelength label signal is analyzed to obtain the current modulating depth of the wavelength label signal; and the OSNR value of each wavelength optical signal is obtained according to the loading-modulating depth and the current modulating depth of the wavelength label signal. The invention simultaneously discloses an OSNR detecting system and OSNR detecting equipment. According to the invention, the scheme is suitable for OSNR test of current high-speed-ratio optical signals being 40G, 100G and the like and particularly suitable for the OSNR test of polarization multiplexing optical signals.

Description

technical field [0001] The present invention relates to optical communication technology, in particular to a method, system and equipment for detecting optical signal-to-noise ratio. Background technique [0002] With the development of wavelength division multiplexing (WDM, Wavelength Division Multiplex) technology, the current optical communication network can simultaneously transmit tens to hundreds of wavelengths of optical signals in the same optical fiber, and based on reconfigurable optical add / drop The multiplexer (ROADM, Reconfigurable Optical Add-Drop Multiplexer) technology facilitates the on-demand configuration of each wavelength in optical communication, so that each wavelength in the optical network does not maintain the same path between two sites, or a certain wavelength is not Always assigned to a certain 2 sites. [0003] Loading a pilot tone (pilot tone) signal for each wavelength in a wavelength division multiplexing system can realize a variety of spec...

AI Technical Summary

Problems solved by technology

In ALCATEL LUCENT's patent with the publication number US20120106951A1 and the name "In-bandoptical signal-to-noise ratio measurement" (in-band OSNR test), based on the top-tuning technology and the narrow-band optical tunable filter, the noise is filtered out twice respectively. For the optical signal at the normal frequency point and the offset frequency point, calculate the size of the service optical signal and the size of the accumulated and amplified spontaneous emission (ASE, Amplified Spontaneous Emission) noise in the erbium-doped fiber amplifier, so as to calculate the OSNR value, but This patented method needs to consider the modulation pattern of the optical service signal to calibrate the OSNR value, etc., and the implementation technology and algorithm are complicated, which is not conducive to the wide and flexible use in ROADM

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