Optical Fiber Communications. Fiber Fabrication by Tingye Li (Eds.)

By Tingye Li (Eds.)

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29 μπι (Lin et al, 1981; Ritger et al, 1982), approximately three times lower than the theoretically predicted bandwidth. The attainable bandwidth is limited by profile perturbations and variations relative to the ideal a profile. , 1982; Chapman # al, 1982; Wrisley and Blaszyk, 1982; Part 5). The transmission bandwidth properties offibersof this design relating the profile parameter a to wavelength and the effect of spectral source width on the achievable bandwidth have been investigated (Horiguchi et al, 1980; Ohmori, 1981; Ohmori et al, 1978).

1) where Fis the normalized frequency and nc the refractive index of the core. 405 for thefirsthigher-order mode beyond which only the fundamental mode will be propagated in the lightguide. In MCVD fibers, the actual cut-off frequency is affected by profile perturbations, the central index dip, and the exact shape of the refractive index profile (Gambling etal, 1978). Because only one mode propagates in a single-mode fiber, there is no intermodal dispersion. The dispersion of the lightguide is due only to chromatic dispersion, which consists of both material dispersion and waveguide dispersion effects (Gloge, 1971a,b; Kapron and Keck, 1971).

This fiber design has been studied extensively by many investigators and represents a good compromise based on source-coupling efficiency, microbending performance, process economics, and splicing and connection considerations. 3. Excellent loss performance in MCVD fibers using this design has been reported by numerous manufacturers. 23 in which the losses are very close to the theoretically predicted limits. 1^. 7 WAVELENGTH (μΠ\) FIG. 32. 5 g/min deposition rate. 23 NA. Numbers presented are values of loss at particular points.

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