![]() There, one measures the time-resolved return loss, which can reveal various information of interest, for example propagation losses of fibers and isolated losses and reflections e.g. This is exploited in the context of optical time-domain reflectometry, which is widely used for monitoring the status of fiber-optic links. A laboratory experiment was designed to provide students with an introduction to byproduct valorization by producing an analogue of biodiesel (fatty acid ethyl esters, FAEE) via lipid extraction and subsequent transesterification from spent coffee grounds (SCG). The actual return loss may be specified for a situation where all light from the output is reflected back to the isolator.Ī fiber itself can have some finite return loss due to Rayleigh backscattering. Similarly, a Faraday isolator would ideally not reflect any light, but some finite return loss results from imperfections. With angle-cleaved splices, even substantially higher values are possible. Good splices should have a return loss of at least 45 dB. ![]() However, some finite return loss (often many tens of decibels) may be caused, for example, when the fiber of the coupler has different guiding properties ( refractive index, effective mode area, etc.) than the fibers spliced to the input and output of the fiber coupler.Īlso low-quality splices can lead to increased return loss. The term return loss is most often used in cases where ideally there would be no reflected light at all.įor example, a fiber coupler (which is a unidirectional coupler) should split the power of incident light between two or more outputs, but should not reflect any light back to the source (assuming that no light is reflected from its outputs). A popular choice is to exploit nonlinear polarization rotation (polarization additive pulse mode locking), where a power-dependent polarization change is. Note that only directly returning light is counted – and no light which is reflected into a different direction, e.g. Usually, the return loss is specified in decibels.įor example, if the return loss is 30 dB, the returning light has only 1/1000 of the power of the incident light. The return loss (or reflection loss) of some optical device (or a combination of devices) specifies how much lower the optical power of the returning (reflected) light is compared with the light sent into the device. How to cite the article suggest additional literature ![]() Encyclopedia > letter R > return loss Return Lossĭefinition: a measure for how much reflected light is attenuated ![]()
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