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Light signal-noise ratio monitoring method for optical transmission system

A technology of optical signal-to-noise ratio and optical transmission, which is applied in transmission systems, electromagnetic wave transmission systems, optical fiber transmission, etc., and can solve problems such as low noise spectrum optical power, the problem of noise power magnitude, and the influence of signal optical power changes

Inactive Publication Date: 2005-07-20
SHENZHEN YAGUAN COMM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the monitoring of noise power, since the signal light of WDM is very close in the spectral domain, and the optical power of the noise spectrum is very low, when monitoring the change of the noise spectrum signal, it is easily affected by the change of the signal optical power
This brings some technical difficulties to the monitoring of the noise power at a specific signal
The actual variation of noise power with wavelength is an irregular curve, so it is difficult to simulate this curve based on a certain number of noise sampling points

Method used

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  • Light signal-noise ratio monitoring method for optical transmission system
  • Light signal-noise ratio monitoring method for optical transmission system
  • Light signal-noise ratio monitoring method for optical transmission system

Examples

Experimental program
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Effect test

Embodiment 1

[0077] Under the first environmental condition, the noise monitoring device 34 can only monitor 1 When the noise signal of the input optical signal 36 passes through the module 32, the separated wavelength is λ 1 The noise optical signal and the wavelength division multiplexing optical channel signal group of a specific wavelength; the noise optical signal is converted into a current through photoelectric conversion in the noise monitoring device 34, the current is converted into a voltage through a logarithmic amplifier, and after the voltage is A / D converted, collected by the microcontroller. The monitor 33 converts the wavelength division multiplexing channel optical group into a current group through photoelectric conversion, and the current group is converted into a voltage group through operational amplification, and the voltage group is collected by a single-chip microcomputer after A / D conversion. The single-chip microcomputer 35 calculates the collected noise data ac...

Embodiment 2

[0084] Under the second environmental condition, the noise monitoring device 34 can only monitor the 1 , lambda 2 When the noise signal of the input optical signal 36 passes through the module 32, the separated wavelength is λ 1 and lambda 2 The noise optical signal and the wavelength division multiplexing optical channel signal group of a specific wavelength; the noise optical signal is converted into a current through photoelectric conversion in the noise monitoring device 34, the current is converted into a voltage through a logarithmic amplifier, and after the voltage is A / D converted, collected by the microcontroller. The monitor 33 converts the wavelength division multiplexing channel optical group into a current group through photoelectric conversion, and the current group is converted into a voltage group through operational amplification, and the voltage group is collected by a single-chip microcomputer after A / D conversion. The single-chip microcomputer 35 calcula...

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Abstract

This invention relates to an optical s / n ratio monitor system used in light transmission system including: measuring numbers of OSNRX of wavelength lambda x light channel in system calibration period to measure N1, N2,...Nm noise optical power with wavelength lambda1, lambda2...lambda m to measure light channel power Px with the wavelength of lambda x so as to compute the Nx(lambda x) at lambda x to compute the relationship coefficient Kx of the said channel noise optical power and the noise platform. In the system operation, m noise optical powers N1, N2 ...Nm with the wavelength of lambda1, lambda2 ...lambda m and channel optical power Px with wavelength of lambda x are measured to compute Nx(lambda x) and optical s / n ratio of the said channel.

Description

technical field [0001] The invention relates to an optical signal-to-noise ratio monitoring method of an optical transmission system, in particular to a monitoring method for an optical signal-to-noise ratio in a wavelength division multiplexing (WDM) transmission system and an optical add-drop multiplexing transmission system (OADM). Background technique [0002] The so-called WDM optical transmission system is to use the principle that different optical wavelengths are independent of each other and do not interfere with each other in an optical fiber to transmit multiple signals from different sources to achieve the purpose of expanding the transmission capacity. In order to increase the transmission distance of the equipment and reduce the manufacturing cost of the equipment, the optical fiber amplifier technology is often used in large quantities in the system. Because optical amplification is an analog processing technology in the optical domain, the digital optical tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/077H04B10/25H04J14/02
Inventor 雷非王红启
Owner SHENZHEN YAGUAN COMM CO LTD