High sensitivity temperature measurement via mask-free hybrid polymer long period fiber grating
- High sensitivity temperature measurement via mask-free hybrid polymer long period fiber grating
- 정호중; 홍성진; 펄스 비욘; 황지현; 이상화; 김준기; 오경환
- Issue Date
- Optics express
- VOL 26, NO 13-16137
- Long-period fiber gratings (LPFGs) are useful for environmental sensing under conditions of high corrosiveness and electromagnetic interference. Most LPFGs are fabricated by coherent or high-power UV illumination of an optical fiber under an amplitude mask, resulting in narrow and environmentally-dependent band rejection. We present a hybrid LPFG waveguide fabricated without an amplitude mask through polymer self-assembly under low-power incoherent UV illumination, which demonstrates high-temperature sensitivity in its transmission spectrum compared to LPFG sensors based purely on silica waveguides. A sensitivity of 1.5 nm °C − 1 is obtained experimentally for attenuation near 1180 nm, and a sensitivity of 4.5 nm °C − 1 with a low random error was obtained with a composite of attenuation bands. Finite element method simulations and coupling mode theory reveal this to be due to a thermo-optic coefficient one order of magnitude greater than that of fused silica. The device has potential for a simple and inexpensive transmission intensity based temperature sensor consisting of an infrared light source, the LPFG, a bandpass filter, and a photodiode.
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