An electro-optic modulator frequency response measurement method and measurement system

Abstract

The invention discloses a measuring method and system for frequency response of an electro-optical modulator. A light beam splitter divides optical carrier signals into an upper path and a lower path; in the upper path, a Mach-Zehnder modulator modulates microwave signals output by a microwave source 1 to optical carrier waves, and double-side-band signals which inhibit the carrier waves are generated, and serve as pumping signals after being amplified; and in the lower path, the electro-optical modulator to be measured modulates microwave signals output by a microwave source 2 to optical carrier waves, and double-side-band signals are generated. The frequencies of the microwave source 1 and the microwave source 2 are adjusted, so that the double-side-band signals output by the electro-optical modulator to be measured form single-side-band signals in a Brillouin medium. A photoelectric detector converts the single-side-band signals into electric signals, an amplitude-phase receiver extracts amplitude and phase information from the electric signals, and combined response of the electro-optical modulator to be measured and the photoelectric detector are obtained; and the frequency response of the electro-optical modulator to be measured is obtained by removing the frequency response of the photoelectric detector.

Description

technical field [0001] The present invention relates to a frequency response measurement method and measurement system of an electro-optic modulator, in particular to a method and system for measuring the frequency response of an electro-optic modulator based on the stimulated Brillouin scattering effect, belonging to the technical field of electro-optical device measurement and microwave photonics . Background technique [0002] Optical fiber communication has many advantages such as anti-electromagnetic interference, anti-corrosion, light weight, and large capacity, so it is widely used in many fields such as high-energy physics, anti-nuclear radiation communication systems, submarines, warships, aircraft, missile control communication systems, and the Internet. At present, optical fiber communication is developing in the direction of high speed, high efficiency, large capacity and long distance optical fiber transmission. As the degree of informatization becomes higher a...

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Problems solved by technology

Many scientific researchers have done in-depth research on this, for example, the traditional light wave component analysis method, but this method has relatively high requirements for matching and has certain limitations

[0005] At the same time, the traditional light wave component analysis method cannot measure the frequency response of the phase modulator. For this, Bao Xiaobin et al. proposed to measure one of the important parameters of the phase modulator in the article 'High frequency measurement and characterization on high-speed electrochemical phase modulator' ——Half-wave voltage, including optical carrier zero point method, first-order optical sideband and carrier strength ratio method, heterodyne method, etc., so as to obtain the high-frequency characteristics of the phase modulator

However, this method is complex and difficult to implement, so we urgently need to study new measurement methods to improve accuracy, and at the same time study the universality of measurement methods, and measure the frequency response of various types of electro-optical modulators with higher bandwidth

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