![]() This way an optical isolator allows light to be transmitted in one direction only and prevent any reflected light to avoid feedback problem. It results in the reflected light polarized in the horizontal plane and hence will be rejected by the input polarizer to allow only to pass the light in the vertical plane. The output polarizer polarized the light traveling in the reverse direction by 45° and then it passes through the Faraday rotator to experience an additional 45° rotation. The output polarizer is relatively aligned at 45° with the input polarizer to allow the polarized light to pass unimpeded. Then it passes through the Faraday rotator to rotate the plane of polarization by 45° on-axis. The light signal traveling in the forward direction passes into the input polarizer to generate a polarized light signal in a vertical plane. A traditional optical isolator uses a faraday rotator as the main component sandwiched between two polarizers to generate the magneto-optic effect. The polarization independent isolator uses birefringent wedges at both input and output sources instead of a polarizer.Īn optical isolator functions on the Faraday effect. For example, a 1064nm high power in-line isolator is a polarization-dependent isolator that is used for a free-space optical system for signal transmission. It is used typically used in free-space optical systems. The polarization-dependent optical isolator is made of three components – a Faraday rotator, an input polarizer, and an output polarizer. Optical isolators can be divided into two types depending on the polarization characteristics – polarization-dependent and polarization-independent. In simple words, an optical isolator is an optical component that allows the light signal transmission in only one direction and prevents any unwanted feedback into the system. It allows the transmission of optical signals in the forward direction while blocking reflected energy back at the source to reduce the interference effect. ![]() An optical isolator is a key component in a fiber optic system.
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