In this paper we investigate the performance of a Fiber Bragg Grating (FBG) as a strain-optic and temperature sensor, using the Coupled Mode Theory (CMT) and the Transfer Matrix Method (TMM), through numerical simulation in an interrogation system with Single-Mode Fiber (SMF) and Photonic
Crystal Fiber (PCF). Parameters such as sensitivity, bandwidth, peak power, peak wavelength and side-lobes power, were analyzed through the Bragg wavelength change depending on the simultaneous variation of strain and temperature. The FBG sensor proposed suffered thermal variation 25 °C
to 200 °C and of strain of 0 μs to 1000 μs, excellent linearity was obtained for the variation of the Bragg wavelength with differences of 0.7 nm for each 50 °C and 0.245 nm for each 200.
In the present work, an optical directional coupler (ODC) based on two-dimensional (2-D) photonic crystal (PhC) was analyzed and proposed, through the methods of plane wave expansion (PWE) and finite-difference time-domain (FDTD), which were used with the purpose of analyzing the behavior of a new all-optical NOT logic gate and the electric field distribution in the coupler for linear (bar), non-linear (cross) states and the control signal. The simulation results in OptiFDTD software show that the proposed crystal structure is a strong candidate for use in ultrafast photonic integrated circuits (PICs), being highly advantageous with excellent transmission performance and simple design.
RESUMONeste trabalho, a propriedade não-linear do amplificador óptico semicondutor (SOA) na modulação de ganho cruzado (XGM) é usada com um interferômetro Michelson (MI) formando uma estrutura SOA-MI para executar a porta lógica NOT a 20Gbps para extrair regras de design simples com um sinal de dados de entrada binária. É demonstrado que a alta taxa de dados pode ser alcançada com uma baixa corrente de injeção específica em SOA, o que leva a um valor baixo no consumo total de energia da porta. Além disso, este trabalho inclui o estudo do efeito da taxa de bits na taxa mínima de erro de bit (BER), e no fator de qualidade máximo (max. Q-factor) baseado no diagrama de olho, para os diferentes valores de dados de entrada e corrente de injeção.
This work aims to discuss a study of numerical simulations of the performance of arrayed waveguide grating (AWG) and fiber Bragg grating (FBG) demultiplexers in a fiber optical network in a special class of fiber denominated fiber of photonic crystal (PCF) considering the dispersive and non-linear effects. The proposed method is based on numerical simulations in a wavelength division multiplexing (WDM) network configuration in PCF. For the simulation and analysis, the commercial OptiGrating software was used, a versatile numerical tool used to model integrated devices that incorporate FBG and OptiSystem software to simulate fiber propagation with non-linear and dispersive characteristics. The analysis of the performance of the systems was done through a comparison between the values obtained in terms of Bit Error Rate (BER) and Quality Factor (Q Factor) in a dense WDM system with spacing between 50 GHz channels, and 12 Gbit/s transmission rate. The results show that the FBG demultiplexer in terms of the BER and the Q factor for the PCF was the one that obtained the best performance, when compared the FBG demultiplexer with SMF and the AWG demultiplexer obtained excellent results for both fibers.
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