Theoretical modeling of index contrast towards all-optical switching in fiber Bragg grating
29 Jul 2015-Vol. 9659, pp 208-214
Abstract: This paper deals with mathematical modeling and study of nonlinear switching in optical fiber Bragg gratings (FBG) by a transfer matrix method. Critical parameters contributing to high performance nonlinear fiber Bragg grating were studied. The transmission spectrum centered at 1550 nm was analyzed with varying number of layers and refractiveindices. The study showed that by proper modification in grating length of the FBG, we were able to optimize transmission spectrum for required application. The nonlinear behavior of FBGs can be further applied in optical switching applications (all-optical logic gates).
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Topics: Fiber Bragg grating (73%), PHOSFOS (69%), Long-period fiber grating (65%) ...read more
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Abstract: We report on our recent experiments on nonlinear switching in fibre Bragg gratings. Using an all-fibre source we show an increase in transmission of a FBG from 4% to 40% at high powers. This switching is associated with the formation of gap solitons inside the grating. We also demonstrate an all-optical AND gate using polarization coupled gap solitons and the optical pushbroom.
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Topics: Fiber Bragg grating (61%), PHOSFOS (60%), Grating (52%)
38 Citations
Abstract: Results of all-optical switching and pulse-routing experiments with a distributed-feedback multiple-quantum-well (MQW) nonlinear waveguide, operating at 1.55 µm, are reported. The MQW material has been engineered, through the controlled introduction of defects, to lower the carrier lifetime from 2.5??ns to 280??ps. The energy required for switching is of the order of 1??pJ or less, the switching time is ?600 ps, and the on–off contrast exceeds 17??dB.
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Topics: Switching time (57%)
31 Citations
Abstract: We experimentally demonstrate all-optical self-switching based on sub nanosecond pulse propagation through an optimized fiber Bragg grating with a π phase-jump. The jump acts as a cavity leading to an intensity enhancement by factor 19. At pulse peak powers of 1.5 kW we observe 4.2 dB nonlinear change in transmission. Experimental results are consistent with numerical simulations.
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Topics: Fiber Bragg grating (68%), PHOSFOS (63%), Long-period fiber grating (62%) ...read more
28 Citations