Optical parametric amplifier-based all-optical signal quality monitor

Abstract

The invention relates to an optical parametric amplifier-based all-optical signal quality monitor, which is used for the online monitoring of optical signal chromatic dispersion, an optical signal to noise ratio and polarization mode dispersion. The monitor comprises a pre-optical amplifier, a semiconductor laser, a coupler, an optical parametric amplifier, an output optical filter and an optical power meter. The semiconductor laser sends out low-power continuous detection light; the continuous detection light and signal light amplified by the pre-optical amplifier are subjected to beam combination by the couple and then injected into the optical parametric amplifier; the optical parametric amplifier transfers the energy of the signal light to the detection light and idle light based on a one-order four-wave mixing effect; and the detection light and the idle light output by the optical parametric amplifier are metered by the optical power meter after passing through the output optical filter. The monitor has the advantages of high response speed, high flexibility, wide working wave band and can respond to the signal rate and modulation format at any time through monitoring; and the monitor is applicable for the online monitoring of quality parameters of signals with the single channel speed of over 100 Gb / s.

Description

technical field [0001] The invention relates to the technical field of signal quality monitoring of an all-optical network and a high-speed, large-capacity optical network. Background technique [0002] In recent years, in order to meet the ever-increasing demand for bandwidth, optical fiber communication networks have developed rapidly. The single-channel 40Gb / s WDM system has been commercialized, and the deployment of WDM systems above 100Gb / s is imperative. The improvement of the transmission rate makes the system have higher requirements for the signal transmission quality. Chromatic dispersion, optical signal-to-noise ratio and polarization mode dispersion are three key parameters to measure the quality of signal transmission. Chromatic dispersion and polarization mode dispersion (CD) will cause signal waveform distortion, and the reduction of optical signal-to-noise ratio means the increase of noise power ratio. In order to realize adaptive compensation for signal ...

AI Technical Summary

Problems solved by technology

However, the current all-optical signal quality monitoring method also has some defects, such as the method based on semiconductor two-photon absorption is not sensitive enough to the change of optical signal quality parameters, and the output signal contrast is low; the method based on the cascaded FWM effect requires higher signal power or higher Long dielectric fibers cause large system power consumption and volume; based on SPM and XPM effects, the central wavelength of the output optical filter needs to be adjusted for different signal rates, so it is opaque to the signal rate

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