Time delay coil (ns/m range)
Product description
Fixed time delay coils are suitable for applications where a simple, passive delay element is needed without the complexity and power requirements associated with active components. According to your delay requirement, we advise and provide the most appropriate time delay coil. Our automatic winding machine ensures the production of high quality fiber coils. Among its capabilities: fiber axis orientation adjustment and tension regulation from 20g to 2kg. We can create several tensions on the same stand and with the same optical fiber as well.
- Fixed delay
- Totally passive
- SM, MM, PM fibers (from UV to IR)
- Coating materials (polymer, polyimide)
- Lengths up to 60km
- With or without stand (copper, aluminium, plastic)
- Adjustable fiber tension: from 20g to 2kg
- Customizable (fiber end connection, etc.)
SPECIFICATION
| Time delay coils | |
| @1550nm | 4.9 ns.m-1 |
| Total length | Up to 60km |
| Dimensions | ID min. = 60mm |
| Wavelength | From UV to IR |
| Fiber | SM, MM, PM |
| Fiber coating | Polymer, polyimide, other |
| Terminations | None, tube, connector |
| Packaging | None, spool, case, rack, thermalized |
IDIL provides coils intended for interferometric applications. We can guarantee the same length among those pigtails thanks to an accuracy to within 1mm. In addition, we can fit different types of connectors at the output of the fiber.
HOW TO CALCULATE A DELAY ACCORDING TO A FIBER LENGTH?
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. 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).
Other examples @ 1550nm:
- 300µs – 60km (max)
- 10µs – 2000m
- 5µs – 1000m
- 2.5µs – 500m
- 5.24ns – 1m
APPLICATIONS
- Telecommunications: coherent receivers, TDM
- Long delays: interferometers, OCT, wavemeters, quantum computing
- Optical phase adjustment (distance change ~wavelength / 2pi phase)
- Autocorrelator: relative timing between 2 ultra-short pulses
- Pump-probe measurement: measure a response to pulse after a given delay
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