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Apparatus and method for simultaneous channel and optical signal-to-noise ratio monitoring

A technology of optical signal-to-noise ratio and optical signal, applied in optics, nonlinear optics, optical transmission systems, etc., to achieve the effect of accurate dynamic range, good accuracy, and wide dynamic range

Inactive Publication Date: 2004-08-18
IND TECH RES INST
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention overcomes the shortcomings of the traditional optical signal-to-noise ratio monitoring

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  • Apparatus and method for simultaneous channel and optical signal-to-noise ratio monitoring
  • Apparatus and method for simultaneous channel and optical signal-to-noise ratio monitoring
  • Apparatus and method for simultaneous channel and optical signal-to-noise ratio monitoring

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Embodiment Construction

[0036] The gist of the invention is to use a photoelectric modulator with polarization selection function and an optical channel identification unit to monitor the OSNR value and identify the optical channel in the DWDM network. image 3 It is a schematic block diagram of an OSNR value monitoring and optical channel identification device according to the present invention. The device includes a polarity controller 301 , a modulation signal source 302 , a photoelectric modulator 303 with polarization selection function, a beam splitter 304 , a photodetector 305 and an optical component 306 . The polarization controller 301, the photoelectric modulator 303, the beam splitter 304 and the photodetector 305 are combined into an OSNR value measurement unit. The optical splitter 304 and the optical component 306 form an optical channel identification unit. In order to increase the detection sensitivity of the photodetector 305 and the optical component 306 , the modulation signal 30...

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Abstract

An apparatus and method for simultaneous channel and optical signal-to-noise ratio (OSNR) monitoring is designed to function in multi-channel wavelength-division-multiplexed (WDM) optical communication systems. A polarization controller is sequentially adjusted to control the polarization of an optical signal. A polarization-selective electro-optic modulator acts as a polarizer and provides a signal dithering to improve the detection sensitivity. A beam splitter splits the dithered optical signal into two portions. A photodetector receives the first portion and measures the OSNR. An optical element receives the second portion and recognizes the channel wavelength among multiple channels. The apparatus can be packaged into a compact module and integrated on a chip. The channel monitoring covers a wide wavelength range and is tunable. The OSNR monitoring can be accurate over a wide dynamic range.

Description

technical field [0001] The invention relates to a device and method for simultaneously monitoring optical channels and Optical Signal-to-Noise Ratio (OSNR) on a Dense Wavelength-Division-Multiplexing (DWDM) optical transmission system. Background technique [0002] In order to provide high-quality transmission services and ensure network stability in a Wavelength-Division-Multiplexing (WDM) network system, it is necessary to monitor optical channel performance parameters such as optical power, optical wavelength, and optical signal-to-noise ratio. The Amplified Spontaneous Emission (ASE) light source amplified in the optical amplifier is unpolarized (Unpolarized) light, while the transmitted data signal almost still maintains the characteristics of polarized light. Therefore, in measuring the ASE level, a polarization extinction (Polarization Extinction, PE) method is used to determine the OSNR value. In the method based on polarization extinction, the monitoring of OSNR is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/02H04B10/08
CPCH04B10/0775H04B2210/078H04B10/00
Inventor 李三良杨淳良巫瑞庭杨明晓
Owner IND TECH RES INST