Device for measuring stimulated brillouin scattering gain spectrum of low-temperature optical fiber

Abstract

A device for measuring a stimulated brillouin scattering gain spectrum of a low-temperature optical fiber comprises a continuous optical fiber laser device, an optical fiber isolator, a 1*2 optical fiber beam splitter, a doubly clad optical fiber amplifier, an optical fiber circulator, a temperature control system, a monomode optical fiber, a 2*2 port 3dB beam splitter, a band-pass filter, a photoelectric detector and an electrical-graphic analyzer. The optical fiber can be refrigerated in a temperature-controllable manner by using liquid nitrogen, the stimulated brillouin scattering gain spectrum in the optical fiber is measured by using an optical heterodyning detecting technology, and measurement accuracy can be improved. The device can realize all-fiber laser, and is controllable in temperature, compact in structure and high in measurement accuracy.

Description

technical field [0001] The invention relates to optical fiber measurement, in particular to a device for measuring the stimulated Brillouin scattering gain spectrum of optical fiber under low temperature conditions. The device has the advantages of controllable temperature, simple adjustment, compact structure and high measurement accuracy. Background technique [0002] In recent years, with the increase of optical fiber transmission capacity and output power, nonlinear effects have been more considered in the design of fiber lasers, fiber amplifiers, fiber filters, fiber sensors and other devices. Stimulated Brillouin scattering is a very important nonlinear effect that occurs in optical fibers. Due to its low threshold, it is very easy to occur in optical fibers, resulting in the energy loss of incident light as a signal carrier in the optical fiber system, and thereafter Scattered light may cause damage to the light source, thereby limiting the power entering the fiber an...

AI Technical Summary

Problems solved by technology

Stimulated Brillouin scattering is a very important nonlinear effect that occurs in optical fibers. Due to its low threshold, it is very easy to occur in optical fibers, resulting in the energy loss of incident light as a signal carrier in the optical fiber system, and thereafter Scattered light may cause damage to the light source, thereby limiting the power entering the fiber and the transmission distance of the system

At present, although the stimulated Brillouin scattering of optical fiber at room temperature has been widely concerned, and its theory has been developed rapidly, but the research on the stimulated Brillouin scattering of optical fiber with the temperature field is relatively small; in addition, due to The gain spectrum of stimulated Brillouin scattering is very narrow, and it is difficult to measure accurately with ordinary spectrometers

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