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.
Based on the nonlinear coupled-mode equations (NCMEs) of fibre Bragg grating (FBG), all-optically tuned delay is
realized in two linearly apodized FBGs in simulation. The characteristics of tuneable delay under the control of input
optical power are analyzed, and the sensitivity of delay time with optical power is discussed. Results show that the delay
maximum can be obtained at the optimal points in connection with input power, operating wavelength and grating
length.
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