SEGMENTED-CORE SINGLE MODE OPTICAL FIBER WITH ULTRA-LARGE-EFFECTIVE-AREA, LOW DISPERSION SLOPE AND FLATTENED DISPERSION FOR DWDM OPTICAL COMMUNICATION SYSTEMS

In this paper we present designs of flbers having non-zero positive, non-zero negative and near-zero ultra-∞attened dispersion with small dispersion slope and ultra-large efiective area over a wide spectral range. The designs consist of a concentric multilayer segmented core followed by a trench assisted cladding and a thin secondary core. The central segmented core helps in maintaining desired dispersion over a wide range of wavelength. The second core of the flber helps in achieving ultra-large efiective area and trench assisted cladding reduces the bending loss. The designs of the flber have been analyzed by using the transfer matrix method. For positive non-zero dispersion ∞attened flber we have optimized dispersion near +4:5ps/km/nm in the wavelength range 1.46{1.65"m. Maximum value of dispersion slope of the flber in above mentioned wavelength range is 0.026ps/km/nm 2 . In the design of negative non-zero dispersion ∞attened flber, dispersion has been achieved near i6ps/km/nm in the spectral range of 1.33{1.56"m and maximum value of dispersion slope is 0.048ps/km/nm 2 . Dispersion and dispersion slope of near zero dispersion ∞attened flber lie in the range (0.0039{ 0.520)ps/km/nm and ((0.0004){(0.0365))ps/km/nm 2 respectively in the spectral range of 1.460{1.625"m. The near zero dispersion ∞attened flber has an ultra-high efiective area ranging from 114"m 2 to 325.95"m 2 in the aforementioned wavelength range, which covers the entire S+C+L-band. These values of mode area are noticeably higher than those reported in literature for ∞attened dispersion flbers with large mode area. Designed flber shows very small bending loss. We report breakthrough in the mode area of the single mode optical flber with ultra ∞attened dispersion and low dispersion slope.