Measuring device and method for frequency response of mach-zehnder electrooptical modulator

Abstract

The invention discloses a measuring device and a measuring method for frequency response of a mach-zehnder electrooptical modulator, which belong to the field of photoelectronic technologies, and aim at overcoming the problems of low frequency resolution, difficult calibration and high bandwidth requirement in the existing measurement. The measuring method comprises the steps of: transmitting a beam of light carrier into a mach-zehnder electrooptical modulator to be measured directly, utilizing a first signal source and a second signal source which are applied on a driving electrode and a third signal source applied on a bias electrode of the mach-zehnder electrooptical modulator to be measured for modulation, wherein the first signal source and the second signal source output sinusoidal signals with frequency difference, and the third signal source outputs a low-frequency signal; transmitting a light modulation signal into a photoelectric detector directly to perform beat frequency operation, extracting amplitudes of three specific frequency mixed signals from a beat frequency signal, and acquiring a modulation factor and a half-wave voltage of the mach-zehnder electrooptical modulator to be measured at single modulation frequency; and scanning frequency of an RF signal to obtain frequency response of the mach-zehnder electrooptical modulator to be measured.

Description

technical field [0001] The invention belongs to the field of optoelectronic device testing, and in particular relates to a measuring device and method for the frequency response of a Mach-Zehnder electro-optic modulator. Background technique [0002] The Mach-Zehnder electro-optic modulator is a key device in optical communication systems and microwave photonic links. With the continuous improvement or expansion of the operating rate and operating frequency, the frequency response of the Mach-Zehnder electro-optic modulator often affects the entire system or chain. Therefore, it is very important to accurately measure the frequency response of Mach-Zehnder EO modulators to realize broadband electro-optical signal conversion and optimize the transmission capacity of communication systems. [0003] At present, the methods for measuring the frequency response of Mach-Zehnder EO modulators mainly include spectral analysis method, frequency sweep method and heterodyne method. Am...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the problems of low frequency resolution, difficult calibration and high bandwidth requirements in the measurement of existing Mach-Zehnder electro-optic modulators, and propose a measurement device and Method for accurate measurement of frequency response of electro-optic modulators with high resolution, no calibration, and low bandwidth requirements

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