![]() Transforming the light output from an optical fiber into a free-space collimated beam is often necessary. For that purpose, a simple collimation lens is sufficient in principle. However, at a distance from the lens, the fiber end has to be firmly fixed which is equal to the focal length approximately. In practice, doing this with a fiber collimator is often convenient. Two different basic types of such devices are there, differing in how you mount the fiber: To bare fibers, some can be attached directly. This is the most compact and cheapest solution, but to fiber, such a fiber collimator is more or less attached permanently. To a fiber connector, other fiber collimators have a mechanical interface e.g. of SMA or FC type; with bare fibers, they are not for use. From a connectorized fiber, one can easily remove and attach such a collimator. For fiber-to-fiber coupling and for launching light from a collimated beam into a fiber, the same kind of device can also be used or: with a fiber collimator, light from the first fiber is collimated and then into the second fiber, it is focused by another collimator. Basically, as the natural interface between free-space optics and fiber optics, fiber connectors can be seen. The optical isolator is also useful. The combination with some additional optical elements and a back-reflecting mirror is another application. Used Lenses Types In collimators, various types of lenses can be used. One uses GRIN lenses mostly for standard telecom fibers and many others as these are small and cheap relatively. However, for larger beam diameters, they are less suitable e.g. of more than a few millimeters. One tends to use doublet lenses or conventional singlet in such cases, which may be of aspheric or sometimes spherical type. The use of special lenses may arise from special requirements. For example, if beams with quite different wavelengths need to be handled, achromatic doublet lenses are used as otherwise for all wavelengths, proper collimation may not be achieved. In cases with large beam divergence from the fiber, aspheric lenses may be used to eliminate spherical aberrations. You can buy fiber adapter online. Original source: fibermarts.wordpress.com/
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