Method and device for monitoring OSNR (optical signal to noise ratio) in high-speed DWDM (dense wavelength division multiplexing) system

Abstract

The invention discloses a method for monitoring the OSNR (optical signal to noise ratio) in a high-speed DWDM (dense wavelength division multiplexing) system. The method comprises the following steps: loading a wavelength label for each wavelength optical signal outputted by a sending end, conducting broadband filtering and narrow-band filtering on the optical signal loaded with the wavelength label, measuring the total power of the optical signal by a digital signal processing technology, calculating the power of the alternating component, and calculating the OSNR according to the total power of the optical signal, the power of the alternating component and characteristic parameters of a filter. The invention further discloses a device for monitoring the OSNR in the high-speed DWDM system; and with the application of the method and the device, the defects of an existing interpolation method and an existing palarization multiplexing are overcome, and the OSNR in the high-speed wavelength division multiplexing system is monitored.

Description

technical field [0001] The present invention relates to optical signal to noise ratio (Optical Signal to Noise Ratio, OSNR) monitoring technology in optical communication technology, relate in particular to a kind of method and method for realizing OSNR monitoring in high-speed intensive light wave multiplexing (Dense Wavelength Division Multiplexing, DWDM) system device. Background technique [0002] The OSNR of the WDM system is a key parameter to measure the transmission performance of the WDM system, which is defined as the signal power of the channel divided by the noise power within 0.1nm at the signal wavelength. At present, with the development of the single-wavelength rate of the wavelength division multiplexing system to 40Gb / s and above, it is more and more difficult to monitor the OSNR. [0003] The traditional method adopts the interpolation method to realize OSNR monitoring, namely: first monitor the noise power outside the signal spectrum, then use the interp...

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Problems solved by technology

However, its implementation technology is complicated, the calibration algorithm is not easy to determine, and the device control is difficult. Most importantly, this method needs to consider the modulation code pattern of the optical service signal, so that different algorithm strategies are selected in the calculation of OSNR, so it is not conducive to the available Widely and flexibly used in reconfigurable optical add-drop multiplexer (ROADM)

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