The analytical formulas of dispersion and mode field radii variation due to the preformfiber drawing ratio (s) and the core-clad index difference (Δn) is derived to approach low loss dispersion-flattened fibers with multiple-cladding. If s2Δn is constant, bend and splice loss will be approximately invariant; both lowering s and raising Δn will lower the dispersion curve. This approach can result in great waveguide dispersion without increasing loss; if s Δn is enlarged, the dispersion curve can be designed to be basically invariant by appropriately lowering s and raising Δn, while bend and splice loss is reduced. Hence the combination of higher core-clad index difference and smaller drawing ratio will be more reasonable for actual low loss dispersion-flattened fibers. On the other hand, adjusting s can compensate dispersion deviation due to disturbed Δn, especially for λ < 1.55 μm. Beyond 1.55 μm, lowering s and raising Δn might make the dispersion-flattening property poor. By selecting suitable s and Δn and adjusting other parameters of arbitrary quadruple-clad profile, low loss dispersion-flattened fibers may be optimized and trial-fabricated.
Simple formulas are derived for the sensitivity of dispersion, mode field radii, and cutoff wavelengths in single‐mode fibers due to arbitrary variations of the drawing ratio and the relative index difference simultaneously. For calculations only the propagation characteristic spectrum of the ideal fiber is required. Some applications are given.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.