Therefore, finally, the light leaves from the o/p polarizer at 45°. Once the light beam arrives at the Faraday rotator, then the rod of the Faraday rotator will turn with 45°. In forward mode, the light enters into the input polarizer then becomes linearly polarized. The operation modes of this isolator are classified into two types based on the different directions of light such as forward mode & backward mode. The working of this is like when light passes through the i/p polarizer in the forward direction & turn into polarized within the vertical plane. The block diagram representation is shown below. Working PrincipleĪn optical isolator includes three main components namely a Faraday rotator, i/p polarizer, & an o/p polarizer. The working of this component mainly depends on the Faraday’s effect which is used in the main component like Faraday rotor. So it plays a main role while preventing unnecessary feedback to an optical oscillator namely laser cavity. It is a passive magneto-optic device, and the main function of this optical component is to permit light transmission in one direction only. What is an Optical Isolator?Īn optical isolator is also known as an optical diode, photocoupler, an optocoupler. To overcome the interference effects, an optical diode or optical-isolator is used. These effects may cause light energy to be reproduced back at the supply and obstruct with supply function. So, these effects may cause light energy.
The optical devices as well as connectors in a fiber optic system cause some effects like absorption, and reflection of the optical signal on the o/p of the transmitter.
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