Fiber dispersion measuring method based on F-P adjustable filter

Abstract

The invention discloses a fiber dispersion measuring method based on an F-P adjustable filter. The wavelength of a tunable laser can be scanned by changing the voltage of piezoelectric ceramics, fiber gratings of different central wavelengths are selected, change of the beat frequency in a fiber resonant cavity is realized, groups of different data are obtained in a spectrum analyzer, time delay without a fiber to be measured of different wavelengths is measured after wavelength scaling, time delay with the fiber to be measured is measured, a series of correspondences between the dispersion amounts of the fiber to be measured and the wavelengths under different wavelengths are obtained, and the dispersion of the fiber to be measured is measured accurately. The tunable fiber laser structure is used, the fiber to be measured in the fiber resonant cavity, a multi-longitudinal-mode beat frequency is used to measure the fiber dispersion, measurement of optical signals is converted into measurement of electric signals, convenience is provided for data processing, the method is not influenced by system loss and light source flucturation, and the fiber dispersion is measured successfully.

Description

Technical field [0001] The invention belongs to the technical field of optical fiber dispersion measurement, and specifically relates to a method for measuring optical fiber dispersion based on an F-P tunable filter. Background technique [0002] Optical fiber communication is a modern communication method that uses light waves as the information carrier and optical fiber as the transmission medium. It has the advantages of fast speed, large capacity, good stability and anti-interference. The dispersion problem of optical fiber communication system has always been a hot spot that people pay attention to. With the continuous improvement of system transmission rate, the inter-code crosstalk caused by various types of dispersion has become one of the main limiting factors of the capacity of optical fiber communication system. Many technical methods are used to compensate for dispersion. For DWDM systems, a certain amount of dispersion is required to reduce the four-wave mixing caus...

AI Technical Summary

Problems solved by technology

There are many methods for measuring optical fiber dispersion, mainly time delay method, phase shift method and interference method. Due to the limitation of the light source, the phase shift method cannot accurately measure the dispersion of the entire telecommunication band (1310-1650nm) optical fiber; the interferometric method is generally used by commercial instruments. means of measurement

The dispersion in the optical fiber is affected by the transmission speed of the light wave signal. Different transmission speeds will produce different dispersions, which will cause the waveform of the optical pulse to broaden, and eventually lead to an increase in intersymbol interference and bit error rate.

The measurement accuracy of the current Agilent dispersion measuring instrument has been improved, but the price is more expensive and the volume is larger

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