RF wide bandwidth lossless high performance low noise transmissive link
US6175672A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1999 |
| Grant date | Jan 16, 2001 |
| Priority date | — |
| Expiry date | Jun 18, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/2575
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A substantially lossless transmissive link, such as an RF fiber optic link, that selectively employs a number of techniques to improve various link parameters. The link may be structured to comprise a high power light source, such as a laser, that provides light output having a high level of optical power. A feedback circuit may be disposed around the light source that reduces relative-intensity-noise levels produced by the light source at low frequencies. A modulator is provided that modulates the light output of the light source. Preferably, a dual output modulator may be used to provide two modulated optical signals whose respective RF modulation is "effectively" 180 degrees out of phase. An optical fiber that transmits the modulated optical signal(s). A photodetector without a load resistor directly on its output that is operable at the high level of optical power, receives the modulated light and recovers the RF signal. A dual balaniced photodetector that is used in conjunction with the dual output modulator. An RF component, such as an amiplifier, that is coupled directly to an output of the photodetector that provides a load resistance for the link.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.