Introduction optical isolator functions and features

An optical isolator is a passive optical components allows only unidirectional light through its working principle is based on Faraday rotation of non-reciprocity. Echo reflected light through the fiber can be well isolated optical isolators. The main advantage of optical isolator Faraday effect of magneto-optic crystal. Optical isolator features are: positive low insertion loss, high reverse isolation, high return loss. An optical isolator is blocked to allow the light to one direction and the opposite direction by the passive components, the role of limiting the direction of light, the light transmission in one direction only, the reflected return light passes through the optical fiber can be an optical isolator good isolation to improve the transmission efficiency of light.
Optical isolator is characterized by high isolation, low insertion loss; high reliability, high stability; very low polarization dependent loss and polarization mode dispersion. variety, including on-line optical isolator, free-space optical isolators, etc. We provide a variety of optical isolators, used to meet the needs of different applications. 1310/1480 / 1550nm polarization-independent optical isolator interior design of two single-mode fiber for craft orthogonal polarization states were treated to ensure the entire device is independent of the polarization characteristics. Unipolar devices with low insertion loss, two-stage device has a high optical isolation, suitable for different applications, mainly used in optical fiber amplifiers, fiber lasers, fiber CATV networks, and satellite communications.
The main advantage of optical isolator Faraday effect of magneto-optic crystal. Faraday Faraday effect was first observed in 1845 does not have the optically active material in the magnetic field by rotating the polarization direction of the light occurs the substance, also known as magneto-optical effects. Polarized along the transmission direction of the magnetic field, whose direction of polarization rotation angle θ and the magnetic field strength B and the length of the material proportional to the product of L. For normal incident signal light, after the passage to become a linearly polarized light from the polarizer, the Faraday rotating magnetic medium, together with the external magnetic field so that the right-handed polarization direction of the signal light 45, and just make a low loss through a polariser 45 placement of the analyzer. For the reverse light of the analyzer when a linearly polarized light through the medium is placed, the deflection direction is right-rotated by 45 degrees so that the polarization direction of the light and the backward direction perpendicular to the polarizer, the reflected light is completely blocked transmission .
Its role is to prevent the adverse effects of the optical path of the light generated due to various reasons, and the light source to the optical transmission system generates. For example, between the semiconductor laser source and an optical transmission system is installed an optical isolator can reduce the adverse influence of the reflected light on the stability of the spectral output of the light source is largely generated. In the high-speed direct modulation, direct detection optical fiber communication systems, the transmitted light will produce additional to noise performance degradation of the system, it also needs to eliminate the opto-isolator. Both ends of the optical fiber amplifier doped fiber isolator mounted glazing can improve the stability of the optical fiber amplifier, if not it will go after the reflected light source (laser), causing volatility in the signal source. In coherent optical long-distance fiber-optic communication systems, at some distance install an optical isolator can reduce the power loss caused by stimulated Brillouin scattering by. Thus, the optical isolator has an important role in optical fiber communication, optical information processing systems, and precision measuring optical fiber sensing system.
OF-Link Communications Co., Ltd is a manufacturer and exporter specialized in fiber optic passive components. We focus on offering products with premium quality and competitive prices in the field of optical fiber communications, fiber laser and fiber sensor applications.



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