A device and method for measuring the frequency response of a Mach-Zehnder electro-optic modulator

Abstract

A measuring device and method for the frequency response of a Mach-Zehnder electro-optic modulator belongs to the field of optoelectronic technology. The purpose is to overcome the problems of low frequency resolution, difficult calibration and high bandwidth requirements in existing measurements. In the present invention, a beam of optical carrier is directly sent into the Mach-Zehnder electro-optic modulator to be tested, and the first signal source and the second signal source loaded on the driving electrode of the Mach-Zehnder electro-optic modulator to be tested and the bias The third signal source on the electrode is modulated, the first signal source and the second signal source output a sinusoidal signal with a frequency difference, and the third signal source outputs a low-frequency signal; the optical modulation signal directly enters the photodetector for beating frequency, and then Extract the amplitude of three specific mixing signals from the frequency signal, and obtain the modulation coefficient and half-wave voltage of the Mach-Zehnder electro-optic modulator to be tested at a single modulation frequency; scan the frequency of the radio frequency signal to obtain the measured Mach‑Zehnder electro-optic modulator frequency response.

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-optical 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. ...

AI Technical Summary

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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