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A compact optical fiber reflective index sensor is proposed and experimentally demonstrated. It is based on the tilted fiber Bragg grating (TFBG) inscribed in the thin-core fiber that is downstream spliced to the conventional single mode fiber (SMF). Thanks to the core dismatch between the SMF and the thin-core fiber, more cladding modes can be recoupled back into the SMF .The sensor can be used to...
Wavelength Switching and multi-wavelength picosecond pulses are generated from a self-seeded Fabry-Perot laser diode and a tilted multimode fiber Bragg grating. 9 discrete wavelengths are obtained by changing the modal distribution in the grating. The sidemode suppression ratio is better than 25dB and pulsewidth is no more than 42ps.
We propose a fiber Bragg grating (FBG) Fabry-Perot cavity sensor consists of a pair of FBGs written directly into the same photosensitive fiber. Laser pulse launched into the cavity produces a group of reflection pulses. The power ratio of the first two reflection pulses could be detected for sensor measurement.
We demonstrate experimentally that the new resonance dips can be generated during the fabrication of CO2 laser written long-period fiber gratings (LPFGs) in a single-mode fiber (SMF) under tension. The dynamic analysis of laser writing process was adopted to study the mechanism of the grating inscription. The new characteristics of grating growth were observed except for the increase of writing efficiency...
We propose a method to measure the dispersion characteristics of the cladding modes of a single-mode fiber for the design of long-period gratings. The phase-matching curves for the first 19 symmetric cladding modes are obtained.
We present an FBG transverse-force sensor based on a wavelength-switching actively mode-locked fiber laser. The output is represented by the time difference between the generated pulses, which is insensitive to temperature changes on the FBG
We present a technique for the multiplexing of temperature-compensated FBG magnetostrictive sensors. Interrogation of sensors is achieved by changing the driving RF frequency of a self-seeded laser diode configured to emit at two close wavelengths.
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