Measurement of Backscattering in Hollow Core Photonic Bandgap Fiber Based on Mach–Zehnder and Michelson Hybrid Interferometer

A Mach-Zehnder and Michelson hybrid M2 interferometer is proposed for measuring backscattering in hollow core photonic bandgap fibers (HC-PBFs). The M2 interferometer has a very simple configuration with a sensitivity of about -142 dB and a spatial resolution of ~37 μm for an HC-PBF. This letter represents the first demonstration of high-resolution time-domain measurements of backscattering in a HC-PBF. The experimental results showed that the investigated seven-cell HC-PBF had a backscattering coefficient of about -88.5 dB/mm. A number of large, non-uniform, closely spaced reflective peaks were found in the backscattering results.

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