What Are the Different Types of Optical Delay Lines?

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There are several types of optical delay lines, each with its own unique characteristics and applications:

 

Fixed Fiber Delay Lines: These use a fixed length of optical fiber to introduce a specific delay. They are simple and reliable but lack flexibility.

Variable Fiber Delay Lines: These allow for adjustable delays by using mechanisms to vary the length of the fiber. They can be used to introduce different delays in a controlled manner.

Mirror-Based Delay Lines: These use a series of mirrors to create a delay. The delay can be adjusted by changing the number of reflections or the distance between the mirrors.

Acousto-Optic Delay Lines: These use sound waves to modulate the refractive index of a material, which in turn affects the speed of light passing through it. This allows for dynamic and tunable delays.

Integrated Optical Delay Lines: These are fabricated on a single chip using integrated optics techniques. They are compact and can be integrated with other optical components.

 

The choice of delay line type depends on the specific application and the required delay characteristics.

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