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A novel refractive index sensor based on a D-shaped photonic crystal fiber with a nanoscale gold belt is proposed. The nanoscale gold belt is deposited on the flat surface to produce surface plasmon resonance. Numerical results show that the refractive index sensor has a broad measurement range which is from 1.2 to 1.4 and the maximum sensitivity can reach to 3751.5 nm/RIU. The refractive index resolution...
An in-fiber modal interferometer is proposed by splicing a section of homemade dual-core dual-core photonic crystal fiber and two segments of single-mode fibers with the air-holes collapsed in the splice regions. With the proposed interferometer as wavelength-selective filter, a room-temperature switchable multi-wavelength fiber laser is proposed and experimentally demonstrated.
Switchable dual-wavelength fiber laser with photonic crystal fiber (PCF) Sagnac loop and broadband fiber Bragg grating (BFBG) at room temperature is demonstrated. By adjusting the polarization controller (PC) appropriately, the laser can be switched between the stable single- and dual-wavelength lasing operations by exploiting polarization hole burning (PHB) and spectral hole burning effects (SHB).
Confinement losses in photonic crystal fibers (PCFs) with different structure are discussed by a full vectorial finite element method. Based on numerical results, confinement losses in high birefringence PCFs and high negative dispersion PCFs are tailored.
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