Refractive Index Profiling of a Core-Doped Photonic Crystal Fiber

Youk, Youngchun; Kim, Soan; Oh, Kyunghwan; Kim, Dug Young

doi:10.1109/lpt.2007.895439

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…Recently considerable interest has been shown in using photonic crystal fibre (PCF) in conjunction with grating structures as fibre sensing devices; this is due to the "endless" geometric and material variations possible [13,14]. It has been shown [15] that LPGs in PCF can have very low temperature sensitivity thus reducing cross-sensitivity problems, resulting in a sensing system with greater resolution.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of femtosecond laser inscribed long period gratings in photonic crystal fibre

et al. 2008

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The use of high intensity femtosecond laser sources for inscribing fibre gratings has attained significant interest. The principal advantage of high-energy pulses is their ability for grating inscription in any material type without preprocessing or special core doping -the inscription process is controlled multi-photon absorption, void generation and subsequent local refractive index changes. The formation of grating structures in photonics crystal fibre has proven difficult, as the presence of holes within the fibre that allow wave-guidance impair and scatter the femtosecond inscription beam. Here we report on the consistent manufacture of long period gratings in endlessly single mode microstructure fibre and on their characterisation to external perturbations. Long period gratings are currently the subject of considerable research interest due to their potential applications as filters and as sensing devices, responsive to strain, temperature, bending and refractive index. Compared to the more mature fibre Bragg grating sensors, LPGs have more complex spectra, usually with broader spectral features. On the other hand they are intrinsically sensitive to bending and refractive index. Perhaps more importantly, the fibre design and choice of grating period can have a considerable influence over the sensitivity to the various parameters, for example allowing the creation of a bend sensor with minimal temperature cross-sensitivity. This control is not possible with FBG sensors. Here we compare the effects of symmetric and asymmetric femtosecond laser inscription.

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Section: Introductionmentioning

confidence: 99%

Characterisation of femtosecond laser inscribed long period gratings in photonic crystal fibre

et al. 2008

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“…This control is not possible with FBG sensors [2]. Recently considerable interest has been shown in using photonic crystal fibre (PCF) in conjunction with grating structures as fibre sensing devices; this is due to the "endless" geometric and material variations possible [3][4]. Particular interest is being shown in writing LPGs into PCF.…”

Section: Introductionmentioning

confidence: 99%