We study the rich multimode content of an ultra-low loss hollow core photonic bandgap fiber using two complementary techniques which allow us to investigate both short and long propagation distances. Several distinct vector modes are clearly identified, with evidence of low intermodal coupling and distributed scattering.
Abstract-Fiber based mode converters and mode splitters are important elements in the FMF mux./demux. Long Period Gratings (LPGs) have been investigated and results presented together with a potential technique for real time mode monitoring during manufacture.
Coupling between the propagating modes and radiation modes of a FMF enables separation and measurement of the properties of the light in each mode independently. A method using prism coupling from a side-polished fibre is described to access and select individual modes.
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