Abstract

A new design of all-normal and near zero flattened dispersion based on all-silica photonic crystal fibers (PCFs) using selectively liquid infiltration technique has been proposed to realize smooth broadband supercontinuum generation (SCG). The investigation gives the details of the effect of different geometrical parameters along with the infiltrating liquids on the dispersion characteristics of the fiber. Numerical investigations establish a dispersion value of −0.48 ps/nm/km around the wavelength of 1.55 μm. The optimized design has been found to be suitable for SCG around the C band of wavelength with flat broadband wavelength band (375 nm bandwidth) and smooth spectrum with only a meter long of the PCF. The proposed structure also demonstrates good tunable properties that can help correct possible fabrication mismatch towards a better optimization design for various optical communication systems.

Highlights

  • Broadband smooth flattened supercontinuum generation (SCG) has been the target for the researchers for its enormous applications in the field of metrology, optical sensing, optical coherence tomography, wavelength conversion, and so forth [1]

  • Photonic crystal fibers (PCFs) [5, 6], which enjoys some unique properties like wide band single mode operation, great controllability over dispersion properties, and higher nonlinearity, has been the target host for SCG for the last decades [1]

  • Tunable photonic band gap (PBG) effect and long-period fiber grating have been successfully realized with liquid-filled PCFs [20]

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Summary

Introduction

Broadband smooth flattened supercontinuum generation (SCG) has been the target for the researchers for its enormous applications in the field of metrology, optical sensing, optical coherence tomography, wavelength conversion, and so forth [1]. One of the foremost requirements of generating broadband flattened SCG is to achieve near zero flattened dispersion around a targeted wavelength. A new design of silica based PCF with all-normal near zero chromatic dispersion around the desired wavelength of 1.55 μm through selectively liquid-filled inner air-holes has been proposed and the optimized design has been targeted for achieving smooth and flattened broadband SC spectra. The main advantage with this approach is that we need not require different air-holes in the cladding to realize near zero dispersion at the desired wavelength; we can tune the dispersion towards a better optimized design by changing the temperature of the liquid and thereby achieving highly smooth and flat broadband SC spectra with only a meter long of the fiber

Liquid-Filled Photonic Crystal Fiber and Related Issues
Analysis Method and Design Optimization of the PCF
Tunable Properties of Inner Ring Liquid-Filled PCFs
Conclusion
Full Text
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