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Fiber Optic Isolator
Why do we need fiber optic isolator?
A fiber optical isolator, or optical diode, is an optical component which allows the transmission of light in only one direction. It is typically used to prevent unwanted feedback into an optical oscillator, such as a laser cavity. The operation of the device depends on the Faraday effect (which in turn is produced by magneto-optic effect, which is used in the main component, the Faraday rotator.
Light can be reflected back and forth. This is also true in fiber optic communication networks. But in fiber optic networks, most of the reflections are harmful to the stability of the system which is especially true for lasers.
Laser Printer Fuser is essentially a resonant cavity between two semi-transparent mirrors. The lasing process happens between these two mirrors. The lasing process is very delicate and can be easily interfered. If back-reflected and scattered light enters into the laser, the lasing process will fluctuate and the output power of the laser will fluctuate.
So that is where fiber optic isolator comes to play. Optical isolators are devices that transmit light only in one direction. They play a vital role in fiber optic systems by stopping back-reflection and scattered light from reaching sensitive components, particularly lasers.
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