Hello,
We are exploring the fabrication of an optical coupler ( fused biconic taper type ), where 1 fiber is having 80 microns cladding diameter with a LP11 cutoff around 850 nm. The other fiber is a standard 125 microns cladding diameter SMF ( LP11 cutoff around 1250 nm). It is understood that the first fiber will be lossy at 1550 nm. My question is if we want to taper both of these fibers to say 10:1, what would be the problem with 1 of them having a much lower cutoff wavelength ?
If the parameters of the original fiber are somewhat different, a null coupler may result, where light launched into one fiber will emerge only from the corresponding end, and coupling occurs only e.g. under the influence of a sound wave propagating in the taper region. That way, one obtain an unusual kind of acousto-optic modulator.
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