The input polarizer blocks the light signals of orthogonal polarization while allowing light signals of only a specific polarization through it. The incoming optical signal passes through the input polarizer. Components of Optical IsolatorĪn optical isolation system typically consists of three main components namely, input polarizer, Faraday rotator, and output polarizer (also called analyzer). Hence, it reduces signal degradation and improves the stability of the optical communication system. Its primary function is to stop the undesirable backward reflection of light signals. Optical isolation is done through an optical device that allows unidirectional propagation of light signals through an optical fiber. Therefore, in order to avoid the reflection of light signals in the backward direction, optical isolation is used. When a light signal propagates through the optical fiber then some portion of this light may get reflected back. Since its function is similar to a semiconductor diode which allows electric current to flow only in one direction. It is also known as an optical diode, photocoupler, an optocoupler. What is an Optical Isolator?Īn optical isolator is a device that allows the light signals to travel only in one direction and absolutely blocks the signals in the other direction. This article describes optical isolation, its definition, components, types, working principles, advantages, and applications. An optical isolator is a passive magneto-optic device that allows light transmission in one direction only.
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