Self-evaluation device and method of fiber optic interferometer for noise testing

Abstract

The invention discloses a self-evaluation device of a fiber optic interferometer for noise testing. The self-evaluation device comprises an internal modulation semiconductor DFB laser, a laser drivingtemperature control circuit board, a modulation signal generation template, a 120-degree phase difference fiber optic interferometer, and a data acquisition and processing module. The internal modulation semiconductor DFB laser comprises a driving current input terminal, a temperature control voltage input terminal, a modulation signal input terminal and a light output terminal. The laser drivingtemperature control circuit board outputs a driving current and a temperature control voltage to the driving current input terminal and the temperature control voltage input terminal of the internalmodulation semiconductor DFB laser. The modulation signal generation module generates two pieces of identical modulation information, wherein the first piece of modulation information is input into the modulation signal input terminal of the internal modulation semiconductor DFB laser, and the second piece of modulation information is input into the data acquisition and processing module. The self-evaluation device is used for evaluating the phase demodulation correctness of the fiber optic interferometer for noise testing, and can easily make a correct judgment on a test result.

Description

technical field [0001] The invention belongs to the technical field of optical fibers, and in particular relates to a device and method for self-assessment of an optical fiber interferometer for noise testing. Background technique [0002] In the fields of coherent laser detection and coherent laser communication, there are high requirements on the phase noise characteristics of lasers, so as to ensure the realization of coherence. The phase noise characteristics of lasers are mainly characterized by physical quantities such as phase noise, frequency noise, phase noise power spectral density, frequency noise power spectral density, and line width. Accurate testing of these physical quantities has always been a very critical issue. It is of great significance in the development and production of linewidth lasers, as well as in the design and integration of subsequent application systems. [0003] In order to solve this problem, researchers from the Shanghai Institute of Opti...

AI Technical Summary

Problems solved by technology

This prior technology uses the electro-optic effect, and the whole process is accurate and effective, but because the electro-optic modulator will be affected by the external environment such as temperature, the consistency is poor, and it is not suitable for use in the case of large temperature environment changes. At the same time, the price of the electro-optic modulator More expensive, the cost of the whole method is higher, and it is not easy to integrate

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