According to your delay requirement, we advise and provide the most appropriate time delay coil. The optical delay depends on the fiber type and length. For example, a 20 km fiber coil will create a fixed delay up to 100 µs.
How to calculate a delay according to a fiber length? To calculate the required fiber length to obtain a specific time delay, use the following formula: L = c Δt / n where c is the speed of light in vacuum, Δt is the desired time delay, and n is the index of refraction of fused silica at the wavelength of interest (use n = 1.4677 at 1310 nm and n = 1.4682 at 1550 nm).
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|Type of fiber||SM, MM, PM|
|Operating wavelength||from UV to IR|
|Coating materials||Please specify (polymer, polyimide, others)|
|Total length||Up to 50km (SM), up to 8km (MM), up to 2km (PM), +/-5%|
|Dimensions||ID min.= 60mm|
|Packaging||None, plate, case, rack, thermalized|
|Passive delay - Examples @1550nm|