Abstract
A half-filling technique was demonstrated to improve the bending properties of a fluid-filled photonic crystal fiber. Such a technique can realize to fill selectively a fluid into half of air holes in a PCF. The bending properties of the half-filled PCF are quite different from those of the fully-filled PCF. Distinct bending properties were observed when the half-filled PCF was bent toward different fiber orientations. Especially, the transmission spectrum of the half-filled PCF was hardly affected while the fiber was bent toward the filled-hole orientation.
Highlights
Microstructures in photonic crystal fibers (PCFs) allow advanced materials to be filled into their air holes, offering a new platform for developing innovative communication and sensing applications [1]
The bandgap edges of the half-filled PCF have distinct bend-sensitivities when the fiber is bent toward different fiber orientations
The transmission spectrum of the halffilled PCF is hardly affected by the bending to the filled-hole side
Summary
Microstructures in photonic crystal fibers (PCFs) allow advanced materials to be filled into their air holes, offering a new platform for developing innovative communication and sensing applications [1]. An index-guiding PCF could be transform into a bandgap-guiding fiber by means of filling a high index material into the air holes [2,3]. Such a transformation in the fiber types may lead to various promising devices such as optical switches [4,5,6,7], tunable filters [8,9], attenuators [10], and dispersion compensators [11,12]. The bandgaps of the fluid-filled PCFs could obviously be changed, even disappear, with the decease of the bend radius. A selective filling technique based on the dependence of filling speed on the size of the air holes was demonstrated in [18,19]. Compared with a fullyfilled PCF, distinct bending properties were achieved in a half-filled PCF and strongly depend on the bending orientations of the fiber
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