![]() ![]() It may also matter how easily and reliably fibers can be connectorized, particularly if that needs to be done in the field.Thousands of mating cycles are not easily achieved, as the contact between the fiber ends needs to be very precise and clean. ![]() Many fiber connectors are rarely disconnected or reconnected in normal use, but for some application a higher number of reconnections ( mating cycles) must be possible during the connector's lifetime./In principle, one could also suppress reflections with anti-reflection coatings on the fiber ends, but this technique is not very common due to various practical issues, such as the fragility of coatings and the substantial effort to produce them.due to an incorrect angle of the fiber tip): the Fresnel reflections at both interfaces can cancel each other only if the gap width is much smaller than one wavelength. Note also that increased reflections can occur as a result of a tiny air gap between the connectorized fibers (e.g. Note that the insertion losses are usually substantially higher than what one would expect from the return loss alone – particularly for fiber connectors using angled fiber ends, where reflected light does not get back into the fiber. Values above 20 dB (i.e., less than 1 % reflectivity) are easily achieved – with some connector versions (HRL = high return loss) even more than 50 dB. For sensitive applications, the reflection loss (= return loss), i.e., the attenuation for light being reflected at the interface, can also be relevant it should be as high as possible.When the same connector is plugged in and out repeatedly, the insertion loss may exhibit significant variations (non-perfect repeatability). Typical values of the insertion loss are of the order of 0.5 dB. Its measurement is defined by IEC standard 61753-1. It is called the attenuation or insertion loss. One specifies a typical coupling loss in decibels. A connector should provide a reliable low-loss contact in the plugged-in state.The following characteristics can be relevant for the selection of fiber connectors: Many properties of fiber connectors can be relevant, depending on the circumstances – this is why many different versions are in use. Characteristics of Optical Fiber Connectors Most fiber connectors have a single fiber, but there are also specialized fiber connectors for fiber arrays. ![]() Dust caps are often used during times where a connector is not plugged in. from connector losses in high-power operation). Hermetically sealed enclosures protect most reliably against moisture and dirt, but can hinder the dissipating of heat (e.g. Therefore, connectors may be put into protective enclosures. These termination assembly operations are often performed in factories, but with suitable equipment they can also be done in the field, preferably in a reasonably clean environment.Īlthough fiber connectors give some protection to the inserted fibers, that protection is quite incomplete, e.g.
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