Photobleaching of fiber bragg gratings written through the fiber coating
US12189176B2 · kind B2 · utility
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13Claims
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Key dates
| Filing date | Oct 15, 2021 |
| Grant date | Jan 7, 2025 |
| Priority date | — |
| Expiry date | Mar 15, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2006/02161
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method and a system for providing a low absorption Bragg grating along a grating region of an optical fiber are presented. The Bragg grating is written along the grating region by multiphoton absorption of ultrafast light pulses impinged on this grating region through a polymer coating of the optical fiber. The Bragg grating is then photobleached by propagating a photobleaching light beam along the optical fiber. The photobleaching light beam has optical parameters selected to reduce defects in the grating region induced by the writing of the Bragg grating in a substantially non-thermal regime.
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