Transmission characteristic of multi-turn microfiber coil resonator

A transmission characteristic of multi-turn microfiber coil resonator (MCR), which is assembled from an adiabatic microfiber, is demonstrated. A comb spectrum was obtained by wrapping a microfiber on a low refractive indexed rod. A resonance with a free spectral range of 0.8 nm was observed with a single turn on a 0.5 mm diameter low-indexed rod and the change in transmission spectrum of the MCR was evident as the number of turns increased. For every additional microfiber turn, there was an addition of an eigenmode to the system which could be observed from the addition of a new resonance for every fringe in the transmission spectrum. The FSR for every added eigenmode was measured to be close to 0.8 nm.

► Investigation of transmission characteristic of multi-turn microfiber coil resonator (MCR).
► Transmission spectrum of the MCR changed as the number of turns increased.
► The free spectral range for every added eigenmode was measured to be close to 0.8 nm.