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Asia Communications and Photonics Conference

Study on characteristics of optical bistable devices based on Fiber Bragg grating

Yongjun Peng, Kun Liang Qiu, Baojian Wu, Siwei Ji

Published Jan 1, 2009• 2 citations
Publisher

Abstract

The simulation model to bistable characteristics of grating is established by using semi-implicit Runge - Kutta method. The bistable characteristics of grating are researched. The results show that the area of S-shaped hysteresis loop, bistable operating condition, bistable threshold and dynamic range can be adjusted by changing grating parameters.

DOI
10.1364/acp.2009.wl12

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Journal of Lanzhou University of Arts and Science•Jan 1, 2014•0 citations
The simulation model to bistable characteristics of grating is established by using semi-implicit Runge - Kutta method. The bistable characteristics of grating are researched. The results show that the area of S-shaped hysteresis loop, bistable operating condition, bistable threshold and dynamic range can be adjusted by changing grating parameters.
The simulation model to bistable characteristics of grating is established by numerically solving the nonlinear coupledmode equations of Fiber Bragg Grating using 3-stage 4-order semi-implicit Runge - Kutta method. The impact of the grating parameters and operating point on S-shaped hysteresis loop parameters is researched. The results show that the area of S-shaped hysteresis loop, bistable operating condition, bistable threshold and dynamic range can be adjusted by changing the operating wavelength and grating parameters, such as grating length, grating apodization and average refractive index modulation depth of grating.
The nonlinear phenomena of optical bistablity is investigated analytically in chalcogenide glass long period fiber grating. Using the basic sets of nonlinear coupled mode equation the expression for the transmittivity of grating has been derived under nonlinear Kerr regime. To examine the bistable charateristics of the grating, the operating wavelength is considerd slightly above the resonance wavelength of 1550 nm i.e. for off resonance condition where detuning parameter δ≠0. It is observed that the intensity of the transmitted wave increases with increasing input intensity and reaches its maximum value at particular intensity. On gradual reduction of the input intensity, the transmitted intensity does not retrace the same path, resulting in a hysteresis loop. This hysteresis loop shows that the LPFG supports the occurrence of optical bistability.
The influence of grating length and fringe visibility for slow light of fiber Bragg gratings were investigated by numerical simulation method,and slow light after optimizing the parameters was proposed emphatically.The results showed that the slow light delay increases with grating length and modulation depth,and change rates increases gradually.A certain bandwidth of resonance peaks on both sides of the side lobe and the peak top become extremely flattened.The slow light delay curves are red-shifted and short wave strengths increase to the opposite direction.The right side of the center frequency spectrum side band has a great vibration.By optimizing the structure parameters,the maximum group velocity can be lowed to c/98.This provides theoretical basis for designing the slow light devices based on fiber Bragg gratings.