Optical fiber coupler achieving scattered coupling and application thereof

Abstract

The invention discloses an optical fiber coupler achieving scattered coupling.The optical fiber coupler comprises two optical fibers (201,202), a coupling area and four terminals (101,102,103,104); the two optical fibers (201,202) are arranged in parallel at equal distance, share common outer cladding (301) and are weakly coupled in the outer cladding (301) to form the coupling area, and the four terminals (101,102,103,104) are arranged outside the outer cladding (301).The optical fiber coupler is characterized in that the length of the coupling area ranges from 2 meters to 20 meters, and the transverse spacing distance between the centers of the two optical fibers ranges from 100 micrometers to 500 micrometers.According to the optical fiber coupler, a traditional means that pumping laser is coupled to inner cladding of an active double-cladding optical fiber through an optical fiber beam combiner is abandoned, and the properties of an optical fiber laser are significantly improved.

Description

technical field [0001] The present invention relates to an optical fiber coupler, in particular to a dispersedly coupled optical fiber coupler and its application Background technique [0002] We know that fiber lasers have developed rapidly in recent years. Its types include fiber-optic pulsed lasers, optical fibers in the inner cladding of active optical fibers for optical amplification. [0003] The current method of coupling the pump laser light into the inner cladding of the active fiber is to use a fiber combiner, which is divided into two types: Nx1 and N+1x1. The former couples N beams of pump light into the inner cladding of the active fiber; the latter couples N beams of pump light into the inner cladding of the active fiber while keeping the signal light transmission of the central core unchanged. In actual use, the effect obviously deviates from the ideal situation. These unideal situations include: 1. The signal light is not completely unaffected, but a discon...

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Problems solved by technology

Scattering, reflections, and mode crosstalk can occur at this point

2 After the pump light enters the inner cladding of the active fiber, it crosstalks with the signal light. After passing through the reflection point, the reflected light of the signal light enters the optical path of the pump light, and thus enters the inside of the pump semiconductor laser, thus Will cause the pump laser to work unstable, damaged, or burned

This is extremely detrimental to the work of fiber lasers and fiber amplifiers

3. The optical power density of the optical fiber combiner at the beam combining point and the bifurcation connection is high, and the heat accumulates. Long-term work is easy to cause heat, which causes the waveguide waveguide to change, thereby reducing or even destroying the optical fiber combiner. work performance

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