Optical fiber power monitoring structure

Abstract

The invention discloses an optical fiber power monitoring structure. The optical fiber power monitoring structure comprises an optical fiber and a photosensitive receiving element used for monitoringoptical signal energy or power; a fiber bragg grating forming an inclination angle with the light transmission direction is arranged in a fiber core of the optical fiber, and part of optical signals transmitted in the fiber core are reflected by the fiber bragg grating, then leaked out of a cladding of the optical fiber in the form of a radiation mode and received by the photosensitive receiving element. By utilizing the characteristics of the fiber bragg grating, power or energy of different wavelengths can be monitored, and the optical fiber power monitoring structure has the characteristicsof simple structure, low cost and the like.

Description

Technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to an optical fiber power monitoring structure. Background technique [0002] At present, the commonly used optical fiber transmission optical power monitoring devices are mainly divided into the following categories according to the different ways of splitting the optical energy: 1) The splitter type such as figure 1 As shown, the use of optical fiber coupler to split light to photodetector for monitoring has disadvantages: high cost, large insertion loss (coupler), and large volume; 2) The reflection type figure 2 As shown, the input and output two optical fibers are processed into a bidirectional collimator, and a partially reflective sheet or film layer is placed, and then a photodetector is used to receive the energy of the transmitted light. Its disadvantages: high assembly requirements, large additional loss, and no Suitable for high-power monitoring; 3) Claddi...

AI Technical Summary

Problems solved by technology

[0002] At present, the commonly used optical fiber transmission optical power monitoring devices are mainly divided into the following categories according to the different ways of splitting energy: 1) The splitting type of the coupler is as follows: figure 1 As shown, the use of optical fiber couplers to split light to photodetectors for monitoring has disadvantages: high cost, large insertion loss (coupler), and large volume; 2) reflection splitting type such as figure 2 As shown, the input and output two optical fibers are processed into a bidirectional collimator, and a part of the reflector or film layer is placed, and then the photodetector is used to receive the energy of the transmitted light. Its disadvantages: high assembly requirements, large additional loss, no Suitable for high power monitoring; 3) Cladding spectroscopic type such as image 3 As shown, opening a window on the cladding of the optical fiber does not destroy the fiber cladding splitting type of the fiber core. Its disadvantages are: complex process, polishing gap (high loss), low efficiency

Images