AR-Coated Single Mode Fiber Optic Patch Cables
- AR-Coated FC/PC or FC/APC Connector for Fiber-to-Free Space Use
- Ideal for Use with Our Fiber Collimation Packages and FiberPorts to Minimize Fresnel Losses
- AR Coating Improves Return Loss
- One FC/PC or FC/APC Uncoated Connector for Fiber-to-Fiber Connection
Thorlabs offers patch cables with a single, antireflection-coated FC/PC or FC/APC connector on one side and an uncoated FC/PC or FC/APC connector on the other. The AR coating is designed to minimize reflections when either launching a free-space beam out of a fiber or coupling a free-space beam into a fiber. The coated connector provides an average reflectivity of <0.5% over the designated AR coating ranges (see the AR Coating Curves tab for plots of reflectivity vs. wavelength).
Fiber-to-Free Space Coupling
When coupling from a fiber into free space, such as when using one of our fiber collimators, the return loss (absence of signals reflected back to the source by the glass-air interface at the end of the fiber) will be worse than comparable values for fiber-to-fiber coupling. By AR coating the connector face, the return loss of an FC/PC connector can be improved by ~8 - 10 dB, and the return loss of an FC/APC connector can be improved by ~2 - 5 dB. In our testing, a cable with an uncoated connector has a typical return loss of ~15 dB (3.16%), while an AR-coated connector has an improved return loss of ~24 dB (0.40%). AR-coated connectors also increase performance when coupling a free-space beam into a fiber.
Note: The AR-coated end is meant for free-space applications (e.g., collimation) and will be damaged if it comes into contact with another connector tip. Mating two AR-coated connectors can increase back reflections, causing a greater loss of transmission than when just using two uncoated connectors.
These cables, which feature FT030-Y Ø3 mm Kevlar reinforced furcation tubing, are well suited for use with our selection of fiber collimators and FiberPort collimators/couplers. AR-coated connectors are designated by the color of the connector's boot or included dust cap. See the Boot Colors tab for details.
Custom-coated patch cables are also available. Contact Tech Support for more details.