What types of fiber are used in fiber coils?

A variety of different types of optical fiber can be used to make fiber coils, depending on the specific application. Single-mode and multimode fibers are commonly used, as are polarization-maintaining fibers, which are designed to maintain the polarization of light as it propagates through the fiber. Specialty fibers, such as dispersion-shifted fibers and photonic crystal fibers, may also be used in certain applications.

How are fiber coils characterized and tested?

Fiber coils can be characterized and tested using a variety of techniques. One common method is to measure the transmission spectrum of the coil using an optical spectrum analyzer or a tunable laser source. This can provide information about the coil's spectral response and the losses associated with the coil. The polarization properties of the coil can also be measured using a polarimeter or polarization analyzer. Other tests may include measuring the coil's temperature dependence, mechanical stability, and reliability under various environmental conditions.

Filter Products

SMF-28

PM1550/980/780/etc.

Fiber Coils for Precision Light Transport Applications

Q: How are fiber coils made?

Fiber coils are typically made by winding a length of optical fiber around a mandrel or spool. The fiber is wound in a spiral shape, with each turn of the coil being separated by a small gap to prevent light from leaking between the turns. The coil can be made with a fixed pitch (i.e., the distance between each turn of the coil is constant) or with a variable pitch (i.e., the distance between each turn varies).

Fiber Optic Coils for Gyroscopes

Request Quote

Sold by: OZ Optics Ships from: Canada

Specifications
Winding Length:	10 – 5000 m
Fiber Type:	SMF-28, PM1550/980/780/etc.
Operating Wavelength:	1650 nm
Coil Type:	Wet (W) or Dry (D)
Coil Inner Diameter:	ID (mm)

Did You Know?

Fiber coils are an important component in many optical systems, providing a compact and efficient way to manipulate light. They are made by winding optical fiber around a mandrel or spool in a spiral shape, with each turn of the coil separated by a small gap to prevent light from leaking between the turns. Fiber coils can be made with a fixed or variable pitch and can be customized with a variety of materials, winding patterns, and coil sizes to meet the needs of different applications. Fiber coils have many applications in optical systems, including telecommunications, sensing, and laser systems. They can be used as polarization controllers, wavelength filters, and optical delay lines, among other things. Fiber coils are also used in fiber gyroscopes, which are used to measure rotational motion in aircraft, ships, and other vehicles. When selecting a fiber coil, several factors should be considered, including the application requirements, the type of fiber being used, and the performance characteristics of the coil. The size, length, and pitch of the coil should be selected based on the specific application requirements, and the type of fiber used should be chosen based on factors such as polarization, dispersion, and transmission wavelength. The performance characteristics of the coil, such as insertion loss, polarization crosstalk, and temperature dependence, should also be evaluated to ensure that the coil meets the required specifications for the application. Fiber coils are a versatile and customizable component that plays a crucial role in many optical systems, making them an important consideration for anyone working in the field of fiber optics.

Related Resources

Frequently Asked Questions

A fiber coil is a length of optical fiber that has been wound into a coil or spiral shape. These coils can be used in a variety of applications, such as sensing, telecommunications, and laser systems, where they provide a compact and efficient way to manipulate light.

Overview of Fiber Coils

Fiber Coils are tightly wound lengths of optical fiber used to provide controlled optical path length, environmental stability, and compact light transport in laboratory and field systems. By winding standard or specialty fiber onto a mandrel, Fiber Coils enable long effective lengths in a small footprint while managing bend radius and polarization effects.

On FindLight, Fiber Coils in this Light Transport domain include single-mode, polarization-maintaining (PM), and specialty designs for interferometry, delay lines, sensing, and coherent communication subsystems.

Typical Specifications

When evaluating Fiber Coils, engineers typically focus on:

Fiber type: SM, PM, few-mode, or specialty fibers (e.g., 780 nm, 1064 nm, 1310/1550 nm telecom windows).
Wavelength range: Nominal operating window and attenuation at the design wavelength (dB/km or dB/coil).
Coil length: From a few meters to several kilometers, defining optical delay and sensitivity in sensing setups.
Coil diameter and bend radius: Mandrel diameter, minimum bend radius, and packing method affecting bend loss and mode distortion.
Polarization performance: For PM Fiber Coils, extinction ratio, beat length, and axis alignment at the pigtails.
Connectors and terminations: FC/PC, FC/APC, SC, LC, or bare fiber ends; optional ruggedized fanouts.
Environmental stability: Operating temperature range, thermal coefficient of delay, and packaging (loose, potted, or housed).
Mechanical form factor: Spool or pancake geometry, mounting features, and approximate mass.

Use Cases for Fiber Coils

Fiber Coils are widely used for fiber-based interferometers, optical time delay lines in radar and lidar, distributed fiber sensing (DTS/DAS), fiber gyroscopes, coherent detection setups, and laboratory light transport where long path lengths must be co-located in a compact volume.

Buyer Guidance on FindLight

For procurement and R&D teams, the main selection criteria are required optical delay or interaction length, acceptable insertion loss, polarization requirements, and mechanical integration constraints. Compare Fiber Coils on FindLight by wavelength range, fiber type, length, coil diameter, connectorization, and environmental ratings to ensure compatibility with your laser sources and detection electronics.

Each product listing includes detailed specifications and documentation. Use the quoting tools on FindLight to contact multiple suppliers of Fiber Coils directly; you can request technical clarifications, lead times, and volume pricing without creating a user account or registering on the platform.