A loss-tunable sandwiched long-period fiber grating (SLPFG) filter is proposed in this Letter. This SLPFG utilized thick SU8 photoresist layers to induce refractive index modulations, and ultrahigh period precision was hence achieved. The external force required to tune this SLPFG filter is about 0.3942 N with the deepest loss attenuation 31.29 dB at 1534 nm wavelength. This process not only improves the overall performance of traditional long period fiber grating but also cuts down the facility cost by 50%. The proposed SLPFG has great potential for low-cost and compact force transducer applications.
This study presents a novel fabrication method of corrugated long-period fiber gratings (CLPFG). The chemical wet etching process is used to fabricate the CLPFG, and the patterned SU-8 50 photoresist is used as etch mask. Since the CLPFG fabricated by the novel method reduces the complication and cost, it is suitable for mass production. In this study, the period of the CLPFG is 690 μm and the resonant-attenuation wavelength is 1558 nm. The maximum resonance-attenuation of the CLPFG is 23 dB. Eventually, the CLPFG in this study has demonstrated a high temperature sensitivity (60 pm/℃), wavelength-shifting linearity (R2=0.99), and 1℃ of resolution.
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