Multiple LP-mode fiber designs for mode-division multiplexing
US9709731B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2014 |
| Grant date | Jul 18, 2017 |
| Priority date | — |
| Expiry date | Dec 18, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/268
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A few-mode fiber is described, having a graded-index core and a surrounding cladding comprising a ledge between the core and the trench, a down-doped trench abutting the ledge, and an undoped cladding region abutting the trench. The fiber's refractive index profile is configured to support 9 or more LP modes for transmission of a spatially-multiplexed optical signal. Undesired modes have respective effective indices that are close to, or less than, the cladding index so as to result in leakage of the undesired modes into the outer cladding. The index spacing between the desired mode having the lowest effective index and the leaky mode with the highest effective index is sufficiently large so as to substantially prevent coupling therebetween.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.