We present a numerical investigation of the generation of an ultra-broadband optical similariton spectrum in a photonic crystal fiber (PCF) with a carbon disulfide core through Raman amplification. The proposed PCF has an extremely high nonlinear coefficient of 4519 W−1km−1 at a telecommunication wavelength of 1550 nm and exhibits near-zero ultraflattened normal dispersion of −1.5(ps/nm/km) as well as low confinement loss of about 10−9 dB/m at 1550 nm. The numerical study was conducted using full vectorial finite-element method with a circular perfectly matched layer as a boundary condition. The similariton generated in the proposed PCF has an ultra-broadband and flat spectrum centered at 1550 nm, which spans from 1383 to 1719 nm via 14 mW input peak power and over a fiber length of only 83 cm. This continuum spectrum covers both C and L bands and can be divided into several narrow bands centered at the wavelengths of the wavelength division multiplexing channels.
A highly birefringent polymer photonic crystal fiber (PCF) for polarization maintaining is investigated in this work. A triangular structure of circular air holes included in polytherimide polymer (PEI) with a defected core for high birefringence is modeled. The properties of this structure are simulated with a full vector finite element method (FVFEM) using PML (Perfect Matched Layer) as boundary condition. The optimized design ensures a very high birefringence of 4.9 10−2 at a wavelength of 1550nm. Furthermore, we have achieved an extremely low confinement loss around 10−6dB/km and negative chromatic dispersion of 180ps/(nm.km) along the y polarization at the operating wavelength. Owing to the excellent polarization maintaining properties, the proposed fiber design could be easily suitable for optical sensor applications. The proposed structure could also enhance the dispersion compensating devices in high bite rate transmission network.
In this paper, we have designed a refractive index RI sensor based on optical fiber micro-ring resonator for water analysis. Where, we have used the Finite Element Method (FEM) to simulate our design. To Asses the effects of the ideal sensor’s material, we have investigated a comparative study between the two popular materials PMMA and the Silicon, plying on the set of common performance parameters: sensitivity, FWHM, quality factor and Limit of detection(LOD) . As a result, we have found that The PMMA material has attended a maximum sensitivity equal to 763.5nm/RIU . However, the best quality factor and LOD are achived by the silicon material that are respectively given 70300 and 3.79 × 10-4 and ultra narrow FWHM (0.024).
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