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An optical fiber grating device including a length of optical fiber having a predetermined fundamental mode effective guide index and a longitudinally tapered region for accessing a fundamental mode of light. The tapered region has a grating with a predetermined light spectral shaping property that

An optical fiber grating device including a length of optical fiber having a predetermined fundamental mode effective guide index and a longitudinally tapered region for accessing a fundamental mode of light. The tapered region has a grating with a predetermined light spectral shaping property that shapes the light spectrum of the fundamental mode. A coating surrounds the tapered region of the fiber for modifying the fundamental mode effective guide index of the fiber in order to change the spectral shaping property of the grating.

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[ What is claimed is:] [1.]1. An optical fiber grating device comprising:a length of optical fiber having a predetermined fundamental mode effective guide index;a longitudinally tapered region formed in the fiber for accessing a fundamental mode of light guided by the fiber, the tapered region compr

[ What is claimed is:] [1.]1. An optical fiber grating device comprising:a length of optical fiber having a predetermined fundamental mode effective guide index;a longitudinally tapered region formed in the fiber for accessing a fundamental mode of light guided by the fiber, the tapered region comprising two adiabatic tapered sections with a minimum outer diameter section therebetween;a grating defined in the minimum outer diameter section of the tapered region, the grating having a predetermined light spectral shaping property that shapes the light spectrum of the fundamental mode; anda coating peripherally surrounding the minimum outer diameter section of the tapered region of the fiber for modifying the fundamental mode effective guide index of the fiber in order to change the spectral shaping property of the grating.