Abstract
We report here a detailed investigation of multi-order dispersion engineering in soft-glass (SF6/SF57/LLF1) based binary multi-clad microstructured fiber (BMMF) in designing nonlinear fiber devices. A full-vector modal analysis is devised to obtain all six field components of the guided mode in order to procure the exact propagation characteristics in an N-layered fiber structure. Investigations for these SF6/LLF1 based BMMF reveal the presence of significant longitudinal field, typical electric field discontinuity and feeble ellipticity in the dominant magnetic field. Subsequently, we analysed in details the dependence of dispersion characteristics on the associated structural parameters. It is seen that the transverse design parameters (core-diameter, pitch and the low-index filling fraction) can be used as a key to widely tune the zero-dispersion-wavelength (ZDW). Various interesting dispersion profiles from the point of view of nonlinear application, namely, ultra-flat dispersion, all-normal dispersion, two-zero-dispersion, three-zero-dispersion are extracted by modifying the geometry. We then discuss an advanced aspect of dispersion engineering that involves minute control over the individual higher-order dispersion parameters. It is observed that this novel structure can yield fine-tuning of HOD’s while keeping the ZDW/maximum dispersion wavelength fixed at the desired operating wavelength. We mark our achievement in demonstrating an incredible control of dispersion through exact structural designing of soft-glass BMMF in the limit of practical realization. The effectiveness of this advanced dispersion tuning is readily implemented in designing a host BMMF that yields a two-octave spanning SC source, wideband fiber-optic parametric amplifier and narrow-band parametric sources in the near infrared to short-wave infrared (NIR–SWIR) region where efficient light sources, amplifiers presently do not exist.
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