C. A. De Francisco

Photonic crystal optical fibers for dispersion compensation and Raman amplification: Design and preliminary experimental results

An optimal design of photonic crystal optical fibers (PCFs) for simultaneous dispersion compensation and Raman amplification is demonstrated by numerical simulation using the finite-difference simultaneous over-relaxation (FD-SOR) method. Preliminary experimental results towards this design are presented.

Requirements for efficient raman amplification and dispersion compensation using microstructured optical fibers

Abstract The design and performance of microstructured optical fibers (MOFs) for simultaneous dispersion compensation and Raman amplification is numerically investigated. We studied a lumped Raman amplifier designed to compensate the signal loss and dispersion introduced by a 100-km, 16-channel C-band WDM link. The impairments induced by the nonlinearities caused by the small mode area of the designed MOF are investigated and the analysis is extended to include non-ideal factors such as excess background losses, splice loss, and the geometry variations during the fabrication process. The results are discussed and compared to those obtained for conventional dispersion compensating fibers (DCFs).

A liquid-filled W-type optical fiber temperature sensor

This paper describes the theoretical analysis and design of a temperature sensor based on a hollow core W-type optical fiber. The core region is filled with a proper mixture of solvents to achieve design goals. Results have shown that high sensitivity devices can be build using this structure.

Numerical analysis of chromatic dispersion in photonic crystal fibers

This paper presents a numerical investigation on the influence of material composition and structural imperfection on the chromatic dispersion of photonic crystal fibers. The results indicated that a precise control of structural parameters as well as doping elements are required if PCF reproducibility is desired.

A semivectorial iterative finite-difference method to model photonic crystal fibers

A simple and accurate method based on finite difference approximation of the semivectorial Helmholtz equation is proposed to find modal solutions of photonic crystal fibers. Results agree well to published data for the investigated wavelength window.

Ultra-wide bandwidth, low voltage, and chirp-free optical intensity modulator: design and performance analysis

A novel wavelength-selective InGaAs/InP coupled asymmetric quantum well electrorefraction type optical intensity modulator is proposed. The device is based on contradirectional exchange Bragg grating coupled-waveguide structure, which avoids the use of an interferometer. For a non-optimized device the bandwidth is 111 GHz at 1.67 V and it is chirp-free. The device can be integrated with lasers, optical amplifiers, photodetectors etc. It can also be integrated in tandem.