By Bishnu Pal (Ed)
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2005a). Also of interest is the high nonlinearity of these glass compositions. The high χ(3) nonlinearities of chalcogenide glasses make them excellent candidates for applications such as all optical processing, Raman amplification, parametric amplifiers and supercontinuum generation. 2. , 1994a). Typical melt temperatures range from 600oC to 900oC, depending upon composition. The liquids are quenched and the glass rods annealed at temperatures around the appropriate softening temperatures. , 1995).
Thus if a DCF is so designed that its RDS matches that of the transmission fiber then that DCF would ensure perfect compensation for all the signal wavelengths. Such DCFs are known as dispersion slope compensating fibers (DSCF). 00335 nm−1. One recent dual-core DCF design, whose refractive index profile was similar to that shown in Fig. km) at 1558 nm) in a DCF. The two cores essentially function like a directional coupler. Since these two concentric fibers are significantly non-identical, through adjustments of index profile parameters their mode effective indices could be made equal at some desired wavelength called phase matching wavelength (λp), in which case the effective indices as well as modal field distributions of the normal modes of this dual core fiber exhibit rapid variations with λ around λp [Thyagarajan & Pal, 2007].
Actually, the theoretical gain (Gth), expressed in dB, as given by Eq 10, could be used instead to compare different fibers, if one considers a standard fiber length of 1 m and a standard pump power of 1 mW. Then, the theoretical gain is given by Eq. , 2006; Lee et al. , 2006), along with the results reported here. 5). Also included is the FOM as defined above for completion. One can easily notice the significant increase in the theoretical gain (or FOM) for the As2S3 fiber due to its smaller core, lower loss and slightly reduced refractive index.
