Method and system for preventing low order optical transmission modes in multimode optical fiber computer network using annulus laser
US6556329B1 · kind B1 · utility
8Cited by
12References
38Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 21, 1998 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | May 21, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S2301/203
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for improving modal bandwidth in computer networks using multimode optical fiber and laser sources is disclosed in which an annular beam is generate by the laser source, thus preventing center fiber transmission modes from reaching the detector. This prevents or lessens a pulse-splitting effect at the detector. The annular beam is generated preferably by configuring a vertical cavity surface emitting laser to have a center totally-reflecting block of 5-7 microns to generate a substantially dark-centered beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.