Optical fiber isolator

Abstract

The invention relates to an optical fiber isolator, which comprises an amplification module, a pumping coupling module and an isolation module, wherein the amplification module comprises a gain optical fiber and a first collimator, the pumping coupling module comprises a first passive optical fiber and a second collimator, and the isolation module comprises a first polarization splitting prism, a Faraday rotator, a 1 / 2 slide, a second polarization splitting prism, a third collimator and a second passive optical fiber. According to the invention, signal light passes through the gain optical fiber and is amplified under pumping excitation, and the amplified light passes through the isolation module; the optical fiber isolator integrates pumping reverse coupling, amplification and isolation functions, the use of passive optical fibers of an optical fiber beam combiner is reduced, welding points are reduced, the loss is small, and the integration level and the stability of the system are improved; and the length of a pulse laser transmission optical fiber is reduced, the nonlinear effect is reduced, and the amplification characteristic and the amplification structure of the pulse optical fiber laser are optimized.

Description

technical field [0001] The invention belongs to the field of laser devices, in particular to an optical fiber isolator. Background technique [0002] In the fiber laser oscillation or amplification system, in order to prevent the amplified energy from being reflected back, causing damage to the previous-stage devices or forming self-excited oscillations, fiber optic isolators are generally used for optical isolation protection to prevent the latter-stage energy from being reflected back to the previous stage. [0003] See figure 1 , in the current fiber laser and amplification system, a fiber combiner (cladding pump) or a wavelength division multiplexer (core pump) is generally used to couple the pump light into the gain fiber for amplification, and then isolate it through the fiber device for isolation protection. However, whether it is a beam combiner or a wavelength division multiplexer as a passive optical coupling device, it is inevitable to introduce various losses d...

AI Technical Summary

Problems solved by technology

[0006] In view of this, in order to solve the above problems, the present invention provides an optical fiber isolator, through the amplification module, the pump coupling module and the isolation module, the optical fiber isolator integrates the pump reverse coupling, amplification and isolation functions, compared with the existing There are technologies that reduce the use of optical fiber combiners and passive optical fibers, thereby achieving the beneficial effects of reducing fusion points, reducing losses, and improving system integration and stability, thereby solving the problems of many optical fiber components and multiple melting points in the prior art. , high loss, complex system structure and low integration

Images