Liquid-Filled Photonic Crystal Fiber and Related IssuesĬonventional PCFs have cladding structures formed by air-holes with the same diameter arranged in a regular triangular or square lattice. 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 also 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. We also investigate the temperature dependence of the liquid-filled PCFs for better optimization design with its tunable property of shifting dispersion peak for optical communication systems. As most of the power resides within the core of the PCF, liquid infiltration in air-holes will have the only effect in dispersion controllability. In the present work, 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. Theoretical design of dispersion management by filling the air-holes of the PCF with selective liquids for both single wavelength and broadband wavelength applications has been studied. Tunable photonic band gap (PBG) effect and long-period fiber grating have been successfully realized with liquid-filled PCFs. An alternative route of achieving similar performance is shown to be practicable by filling the air-holes with liquid crystals or by various liquids such as polymers, water, and ethanol. However, the realizing technology of complicated structures or PCF having air-holes of different diameters in microstructure cladding remains truly challenging. Researchers have worked on designing novel dispersion profiles with variable air-hole diameter in the cladding and this design can be further manipulated for SC generation by pumping at the near zero wavelength. Photonic crystal fibers (PCFs), 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. One of the foremost requirements of generating broadband flattened SCG is to achieve near zero flattened dispersion around a targeted wavelength. However, achieving flat broadband smooth SC sources for IR applications remains challenging. Unconventional PCFs based on aperiodic structure have also been investigated. Recent developments for mid-infrared (MIR) SC source have been investigated based on nonsilica fibers. Introductionīroadband 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. 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. 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. Numerical investigations establish a dispersion value of −0.48 ps/nm/km around the wavelength of 1.55 μm. The investigation gives the details of the effect of different geometrical parameters along with the infiltrating liquids on the dispersion characteristics of the fiber. 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).
0 kommentar(er)
