In one of our fiber photometry rigs, there is a pigtailed rotary joint connected to an FC-FC mating adapter (flange 11mm) that is then connected to our fiber optic patch cord. The problem is, the light transmission out of the pigtail is around 90 uW, and the adapter is pretty much the same, but then when we measure light transmission out of the fiber optic patch cord its around 20-30 uW. Is there any way to better optimize this region to get a higher light output?
Thanks!
Yama bölgesini aynı özellikteki veya ışık iletimi daha fazla olan bir malzeme ile kaplamak(iletim yoluyla) gerekiyor.
Are the numerical apertures of the pigtailed fiber and the patch-cord the same? If there is a significant mismatch this would lead to reduced coupling efficiency. Ideally you want the spatial modes of the patch-cord and the pigtailed fiber to be as close as possible.
Dear Sadia Rahman ,
in addition to the answer of Michael Belsley about the NA, I would like to raise up the question about a) the fiber core diameters*) and b) the wavelength specifications; do they match ?
Second: cleaning of the fiber tips could help...
*) Adapters (connectors) may be the same; but you may have different fiber core diameters; so for example for a 100µm pigtail into 50µm patch cord the flux will already go down to about 1/4....
Best regards
G.M.
Assuming that you have matched NA's, core diameters, fibers (polarization characteristics, for example) and have compatible end-faces (angled/angled or straight/straight), in other words, that you have the right fibers and connectors, then you might suffer the problem that plagues all fiber connections -- dirt stuck to one of the end-faces or damage to one or more end-faces. You can check under a low-powered microscope. (Please take no offense at this low-tech suggestion -- it happens in all photonics labs.)
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