Measuring method for achieving optical fiber dispersion based on laser beat frequency

Abstract

The invention discloses a measuring method for achieving optical fiber dispersion based on laser beat frequency. A 980 pumping source sends out light with the wavelength of 980 nm, the light passes through a wavelength division multiplexer, is amplified through erbium-doped optical fiber, then passes through optical fiber to be measured, passes through an optical fiber resonant cavity formed by a circulator and an FP cavity narrow-band filter, then returns and sequentially passes through the optical fiber to be measured, the erbium-doped optical fiber and the wavelength division multiplexer, at the moment, the light reflected by a sagnac ring continues to be reflected in a light path graph, a part of light transmitted by the sagnac ring passes through a photoelectric detector and a spectrum analyzer, multiple sets of data are obtained on the spectrum analyzer by adjusting the cavity length of the FP cavity narrow-band filter, and a dispersion spectrum graph is obtained through processing of origin software. The problem that an existing dispersion measurement device in the marker is large in size and heavy and consumes long time is solved.

Description

Technical field [0001] The invention belongs to the technical field of dispersion measurement methods, and specifically relates to a measurement method for realizing fiber dispersion based on laser beat frequency. Background technique [0002] Many substances in nature have dispersion, and various optical fibers and devices (optical isolators, circulators, optical switches, etc.) have dispersion. The dispersion measurement methods include phase shift method, interferometry and pulse delay method, among which the phase shift method is the most commonly used. The chromatic dispersion in the optical fiber is affected by the transmission speed of the light wave signal. Different transmission speeds will produce different chromatic dispersion, which will cause the waveform of the light pulse to broaden, and ultimately lead to the increase of inter-symbol interference and bit error rate. The current Agilent dispersion measuring instrument has improved measurement accuracy, but it is m...

AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the present invention is to provide a method for measuring optical fiber dispersion based on laser beat frequency, which effectively solves the problems of large volume, heavy weight, long time and high price in the current dispersion measurement in the market

[0005] Compared with the prior art, the present invention has the following advantages: (1) The optical fiber resonator is formed by connecting the circulator and the FP cavity narrow-band filter, which effectively prevents the FP cavity narrow-band filter itself from generating laser light; (2) On the one hand, it solves the problem of calibration And the problem of difficult installation, small size, on the other hand solves the problem of expensive, faster startup, easy to use

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