Optical fiber dispersion coefficient measuring method

Abstract

The invention discloses a measuring method based on an optical fiber dispersion coefficient measuring device. The device comprises a broadband light source, an electro-optical modulator and a computer. An output end of the broadband light source is connected with an optical fiber coupler, one output end of the optical fiber coupler is connected with an electric adjustable optical fiber delay line,the optical fiber coupler and the electric adjustable optical fiber delay line form a Mach-Zehnder Interferometer, an output end of the Mach-Zehnder Interferometer is connected with a spectrometer and the electro-optical modulator, modulation signals outputted by the electro-optical modulator pass an optical fiber to be measured and then enter a high-speed photoelectric detector, the high-speed photoelectric detector converts optical signals into microwave signals which are amplified by a low noise amplifier, an output end of the low noise amplifier is connected with a microwave power divider, the microwave power divider injects parts of the microwave signals into the electro-optical modulator and simultaneously inputs other microwave signals to the spectrometer, and the tail end of the spectrometer is connected with the computer. The measuring method can realize high-precision optical fiber dispersion coefficient measurement, environmental influence is overcome, and a structure is simplified.

Description

technical field [0001] The invention relates to a measuring method, in particular to a measuring method of optical fiber dispersion coefficient. Background technique [0002] Optical fiber dispersion coefficient means the pulse broadening value caused by unit spectral width. The dispersion coefficient of the optical fiber is an important parameter of the optical fiber, and the size of the dispersion coefficient determines the dispersion compensation ability of the dispersion fiber. [0003] The measurement of optical fiber dispersion coefficient is an important research direction of optical fiber parameter measurement technology. Traditional measurement methods are realized by pulse delay method, phase shift method, mode field diameter method and white light interference. The phase shift method is vulnerable to large atmospheric disturbances. Disadvantages of interference with environmental vibrations, white light interference is limited by diffraction and the lateral resol...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of high cost, poor precision and complex structure in the working process of the existing measuring device, and provide a measuring device for the dispersion coefficient of optical fiber, thereby solving the above-mentioned problems

Images