L band amplifier with distributed filtering
US6459526B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1999 |
| Grant date | Oct 1, 2002 |
| Priority date | — |
| Expiry date | Aug 9, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S2301/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An L-band optical amplifier has a rare earth doped gain medium including a filter distributed over a finite physical portion of the gain medium. The filter is distributed over between about 25% to substantially the entire length of the gain medium. The distributed filter substantially eliminates out-of-band light emission (C-band ASE, 1520 nm-1565 nm) and thus improves the performance of L-band amplification (1565 nm-1620 nm). Examples of distributed filters include discrete type filters such as long period gratings, or continuous type filters such as rare earth doped, twin core fibers, non-adiabatically tapered fibers and coaxial resonant ring fibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.