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US 5,218,655 AGranted
Article comprising an optical waveguide with in-line refractive index grating
AssigneeAT&T Bell Laboratories
InventorVictor Mizrahi
Life of this patent
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Abstract
Broadband in-line gratings in optical waveguides are disclosed. The gratings have a bandwidth of at least 2 nm (preferably at least 4 nm) and a peak reflectivity of at least 70% (preferably at least 90%). Exemplarily, such gratings can be formed in H.sub.2 -treated Si-based fibers that support a normalized index change of at least 10.sup.-3. Gratings according to the invention can be used, for instance, to form pump radiation reflectors in an optical fiber communication system with Er-doped fiber amplifiers.
Claims6
An article comprising
- a) means for generating optical radiation of wavelength .lambda..sub.0 ;
- b) means responsive to said optical radiation;
- c) an optical waveguide radiation transmission path linking the means of a) and the means of b), a portion of said transmission path being an optical waveguide which comprises a core region that is at least partially surrounded by a cladding, the core having a longitudinally varying refractive index, the index varying such that said portion of the transmission path can reflect radiation of a predetermined wavelength, said portion to be referred to as the grating, associated with said grating being a center wavelength, a reflection bandwidth and a peak reflectivity;
- characterized in that
- the grating has a reflection bandwidth of at least 2 nm and a peak reflectivity of at least 70% .
2 more elements
Dependencies are inferred from the claim text.