Design considerations for the structural optimization of a single-mode fiber

Design considerations are made for the structural optimization of single-mode fibers used in high-bit-rate and long-haul transmission systems in the long-wavelength region. As the basic fiber parameters, a combination of the spot size W 0 and the effective cutoff wavelength λ ce is newly chosen, because the combination is found to suitably describe various actual index profiles which deviate from an ideal step-index profile. A procedure to specify the usable range of W 0 and λ ce is established, whereby the overall transmission-line loss in one repeater section is calculated using simple expressions for fiber intrinsic loss, excess loss in the cabling process, and splice loss, etc. The optimum values for a 400 Mbit/s transmission system operating at 1.3 μm with a repeater spacing of 20 km are obtained as W_{0} = 5.0 \pm 0.5\mu m and 1.1 μm \leq\lambda_{ce}\leq 1.28 \mu m taking into consideration the additional requirement for the possible use at \lambda=1.55 \mu m

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