Light vector network analyzer system based on double-channel Mach-Zehnder modulator

Abstract

A light vector network analyzer system based on a double-channel Mach-Zehnder modulator comprises a light source, a microwave source, a three-channel direct-current voltage source. The light input end of the double-channel Mach-Zehnder modulator is connected with the output end of the light source. The radio frequency signal input end of the double-channel Mach-Zehnder modulator is connected with the output end of the microwave source. The bias voltage input port 1 of the double-channel Mach-Zehnder modulator is connected with the output port 1 of the three-channel direct-current voltage source, the bias voltage input port 2 of the double-channel Mach-Zehnder modulator is connected with the output port 2 of the three-channel direct-current voltage source, and the bias voltage input port 3 of the double-channel Mach-Zehnder modulator is connected with the output port 3 of the three-channel direct-current voltage source. The input end of an optical band-pass filter is connected with the output end of the double-channel Mach-Zehnder modulator. The input end of an erbium-doped optical fiber amplifier is connected with the output end of the optical band-pass filter. The input end of a light to-be-detected device is connected with the output end of the erbium-doped optical fiber amplifier. The input end of a photoelectric detector is connected with the output end of the light to-be-detected device. The input end of a microwave signal amplitude phase detector is connected with the output end of the photoelectric detector.

Description

technical field [0001] The invention relates to an optical vector network analyzer system, specifically an optical vector network analyzer system based on a double-balanced Mach-Zehnder modulator to realize accurate measurement, and belongs to the technical field of microwave photonics. Background technique [0002] Optical passive devices are an important part of optical fiber communication equipment and indispensable components in other optical fiber application fields. It has the characteristics of low insertion loss, high reliability, stability, and easy operation. It is widely used in long-distance communication, regional network, fiber-to-the-home, video transmission, and optical fiber sensing. In recent years, with high Q value, With the development of optical passive devices with fine-tunable spectra, the requirements for measurement accuracy of optical devices are getting higher and higher. Optical vector network analyzers measure the magnitude and phase of the fre...

AI Technical Summary

Problems solved by technology

Traditionally, the testing methods using optical vector network analyzers are mainly phase-shifting or interferometric methods, but these two methods rely on wavelength-tunable lasers for measurement, and the measurement accuracy depends on the wavelength scanning accuracy of the laser, which is generally greater than 1pm, low precision and poor stability

Recently, a measurement method using SSB modulation has been proposed, which has high accuracy, but the measurement will introduce certain errors, and it is necessary to find a way to eliminate the errors (W.Li, W.H.Sun, W.T.Wang, L.X.Wang, J.G.Liu, and N.H.Zhu, "Reduction of measurement error of optical vector network analyzer based on DPMZM," IEEE Photon.Technol.Lett., IEEE Photon.Technol.Lett., vol.26, no.9, pp.866-869.May.2014.)

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