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Optik

Enhancement of slow and fast light devices characteristics, combining ring resonator with fiber bragg gratings

Behnoosh Babaghorbani, Hassan Kaatuzian

Published Dec 18, 2020• 5 citations
Publisher
DOI
10.1016/j.ijleo.2020.166167

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Journal of Physics D Applied Physics•Dec 28, 2023•2 citations
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.
We demonstrate through numerical simulations that the slow-light resonances that exist in strong, apodized fiber Bragg gratings (FBGs) fabricated with femtosecond pulses in deuterium-loaded fibers can exhibit very large intensity enhancements and Purcell factors with the proper optimization of their length. This potential is illustrated with two saturated FBGs that are less than 5 mm long and have been annealed to reduce their internal loss. The first one exhibits the largest measured Purcell factor in an all-fiber device (38.7), and the second one exhibits the largest intensity enhancement (1525). These devices are anticipated to have significant applications in quantum-dot lasers, nonlinear fiber devices, and cavity quantum-electrodynamics experiments.
Abstract A novel all-optical scheme for fast modulation of Fano-like resonance using Er/Yb doped fiber (EYDF) is proposed and demonstrated experimentally. In the integrated system, an apodized fiber Bragg grating (AFBG) is inserted into one arm of the fiber Mach–Zehnder interferometer (MZI), and the asymmetric Fano-like resonances is generated by the interference between the MZI mode and AFBG mode. In addition, a section of EYDF is inserted into the other arm of the MZI to control the phase difference between the two arms of the MZI. By adjusting the power of optical pump applied to the EYDF, the transmission spectrum lineshapes of the integrated device can be effectively modulated into asymmetric Fano-like resonances, symmetric transmission dip or electromagnetically induced transparency-like resonances, which has a fast response speed. The proposed all-optical Fano-like modulation scheme is simple in structure, and has advantages of remote control and long-term stability, providing potential applications in the fields of fast and slow light, optical filters and fiber sensing.