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Only the optical isolator is an optical passive unidirectional transmission allows light , which is used to prevent the laser , optical amplifier, the light emitting device in the working optical path from the return light beam . With the development of optical communication technology , optical isolator toward high power , small size, low cost, no polarization mode dispersion direction. This paper developed a new high- power fiber isolators The main contents and innovations are as follows : 1. Introduces high-power optical isolator development status and trends of several polarization-independent optical isolator is analyzed and compared , describes the optical isolator structure and working principle . On this basis, the design of a new structure of high-power fiber polarization-independent optical isolator, optical isolator assemblies were introduced , analysis and calculation of this optical isolator production methods and processes. (2) for the developed optical isolator made ??a theoretical analysis of key performance parameters , introduces the main performance parameters of the test method, developed a device to be tested. Test results show that the isolator when power is 45W work well . At this point , the measured insertion loss of 0.7dB, λ0 ± 20nm bandwidth range average isolation 25dB, maximum isolation 30dB, polarization dependent loss is less than 0.2dB, polarization mode dispersion is less than 0.1ps. Innovation of this paper is to : ( 1 ) Through the C-lens, G-lens and A-lens analysis and calculation , the choice of C-lens as a collimator collimator lens , and optical properties of its mass were analyzed theoretically , C-lens refractive index homogeneity , and is suitable for long distance work , is the best choice for high power devices . ( 2 ) by the rotation of the existing magnetic material were analyzed and compared using terbium gallium garnet (TGG) crystal , TGG crystal 1064nm band has a large Faraday rotation coefficient , low optical loss , a larger optical damage threshold , higher thermal conductivity , and good mechanical properties , but also produce a good material for high power devices .
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