Twisted long-period fiber grating and method for reducing polarization dependent loss and shifting wavelength of a long-perion fiber grating
US6707966B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 2000 |
| Grant date | Mar 16, 2004 |
| Priority date | — |
| Expiry date | May 10, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/02095
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A long-period fiber grating includes a fiber having a core surrounded by a cladding, and a plurality of refractive index variations periodically spaced along the longitudinal axis of a portion of the core of the fiber. The fiber is twisted throughout at least a portion of its length that includes the plurality of refractive index variations. By twisting the long-period fiber grating, polarization dependent loss is reduced by as much as 30 percent. Also, the peak wavelength of the light propagating through the long-period fiber grating that is coupled into the cladding of the fiber may be adjusted. The peak wavelength may be adjusted in as little as 0.1 nm increments by twisting the long-period fiber grating after the grating has been written and annealed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.