A method for obtaining DWDM system optical S/N ratio

Abstract

The invention discloses a method of calculating optical signal noise ratio in a DWDM system, which is suitable for the DWDM system comprising an optical amplifier. The invention comprises: step 1, in accordance with the optical amplifier noise coefficient and the gain, a spontaneous radiation noise power is amplified; Step 2, the single-channel input power of the optical amplifier is calculated, and an input optical signal noise ratio is obtained in accordance with the single-channel input power and the input optical signal noise ratio; Step 3, output noise power is obtained from the amplified spontaneous radiation noise power, the input noise power, and the gain; step 4, the single-channel output power is calculated and the signal output optical signal noise ratio is obtained in accordance with the output signal power and the output signal noise power. The invention overcomes the shortcomings that the estimation method of the optical signal noise ratio is unable to adapt the non-equidistant system, span transmission optical power uneven system, lower signal noise ratio system and horizontal compatible system in the prior art.

Description

technical field [0001] The invention relates to optical transmission technology, in particular to a method for accurately obtaining the optical signal-to-noise ratio of a DWDM (DenseWavelength Division Multiplex) system. Background technique [0002] Noise, chromatic dispersion, nonlinear effects and polarization mode dispersion are four key issues that need to be considered in the current DWDM system design. The noise mainly comes from the application of Optical Amplifier (OA) in the DWDM system. In DWDM system design, engineering debugging, and equipment operation, it is often necessary to calculate or monitor the Optical Signal-to-Noise Ratio (OSNR) of each network element in the system. ITU-T (Telecommunication Standardization Sector of International [0003] Telecommunication Union, International Telecommunication Union Telecommunication Standardization Sector) Recommendation G.692 (10 / 98) "Optical interfaces for multichannel systems with optical amplifiers", ITU-T Re...

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a method for calculating the optical signal-to-noise ratio of a DWDM system, which is used to overcome the inability of the prior art optical signal-to-noise ratio estimation method to adapt to non-equidistant systems, and the cross-segment transmission optical power is not Disadvantages of equal system, low signal-to-noise ratio system and horizontally compatible system

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