End Cap for Singlemode Fibers
During coupling into a singlemode fiber, the laser beam is focused into the fiber core, resulting a high power density on the facet. This is higher the smaller the fiber core and larger the laser power. To reduce the power density, an end cap will be spliced on the fiber facet. The laser beam is focused on the fiber core over the end face of this end cap, where at the same laser power, the power density is significantly lower.
The length of the end cap is adjusted exactly to the fiber core. For singlemode fibers this starts at 100 μm. The diameter of the end cap is adjusted to the cladding diameter of the fiber. The singlemode fibers with spliced end cap are terminated with standard connectors (SMA, FC …) but also with application-specific ferrules.
|Connector Type||SMA, FC/PC, FC/APC, Special Ferrule|
|End Cap-Diameter||The same like Cladding Diameter|
|End Cap-Length||ab 100 µm|
|End Cap-Material||Fused Silica|
|Fiber Type||Singlemode, Polarisation Maintaining PM Fiber|