Abstract
We present a specialty photonic bandgap fiber (PBG) with multiple concentric cores based on the one-dimensional (1D) photonic crystal geometry in an all-solid form. It comprises three sets of tailored bilayer thickness in which each set of bilayer forms an effective core region that allows confinement of specific range of wavelengths. Thus, the successive overlap of the wavelength ranges supported by each of these concentric cores effectively enhances the overall transmission bandwidth of the designed 1D PBG fiber. Moreover, the concept can be extended to form a large number of concentric cores that allows further enhancement of the fiber bandwidth. As a proof-of-concept, an ultra-wide low-loss bandwidth covering a wavelength range of \(\sim\) 1600 nm for the fundamental mode are achieved. Going beyond, an advanced level customization of the proposed fiber geometry enables further minimization of loss and enhancement in structural robustness. The propagation dynamics of an ultrashort pulse \(\sim\) 300 fs are investigated numerically in both the normal and the anomalous dispersion regime of the proposed specialty fiber in the presence of nonlinearity and loss. Eventually, such all-solid multicore large-bandwidth fiber is proposed as a promising candidate for the delivery of ultrashort optical pulses over long distance with minimum amount of distortion and wave-breaking possible.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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PB and SG acknowledge technical support from Indian Science Technology and Engineering facilities Map (I-STEM), India.
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PB and SG acknowledge financial support from SEED grant of IIT Jodhpur.
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Biswas, P., Pal, B.P. & Ghosh, S. Ultra-wide bandwidth all-solid specialty bandgap fiber for ultrashort pulse delivery. Opt Quant Electron 55, 1260 (2023). https://doi.org/10.1007/s11082-023-05547-5
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DOI: https://doi.org/10.1007/s11082-023-05547-5