| 摘要 |
Disclosed is a dispersion-compensating (DC) optical fiber 10 that is designed to support the fundamental mode of radiation at 1550 nm. The DC fiber is fabricated from silica glass and has a refractive index profile that includes a core region 51 surrounded by a cladding region 52 having a nominal refractive index n4. The core region includes a central core 511 having a nominal refractive index n1, a "trench" 512 surrounding the central core having a nominal refractive index n2, and a "ridge" 513 surrounding the trench having a nominal refractive index n3. A range of refractive index profiles has been found that provides relative dispersion slopes (RDS) that are greater than 0.012 nm-1 and figures of merit that are greater than 200 ps/(nm.dB). The range is conveniently expressed in terms of index differences and radial dimensions:central core: radius=1.5±0.5 mum, and 0.015<n1-n4<0.035;trench: width=4.3±1.0 mum, and -0.012<n2-n4<-0.006; andridge: width=2.4±1.0 mum; and 0.002<n3-n4<0.015.
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