Cryogenic signal coupler having imaging lens within a thermal barrier region for optoelectronic coupling
US5247183A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1991 |
| Grant date | Sep 21, 1993 |
| Priority date | — |
| Expiry date | Nov 18, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A cryogenic signal coupling apparatus includes a laser which launches optical power into an integrated optical waveguide (IOW) within a cryogenic region via an imaging lens. This optical power is then equally split by a passive optical splitter, and fed to one or more 1.times.2 IOW devices. Within the cryogenic region, a plurality of infrared sensing photodiodes provide electrical signal outputs in response to optical stimuli, which signal outputs are amplified and selected by a multiplexing arrangement for application as the modulating signal to one of the 1.times.2 IOW's. Control electronics also within the cryogenic region supply timing and control information to the other electronics therein. The IOW's modulate their input optical power in accordance with their respective modulating electrical input signals, and provide differential optical outputs which are directed across the thermal barrier to individual differential optical receivers. In one embodiment, the electrical signal from the light sensors is selected by an electrical multiplexer for application as the modulating signal to a single optical modulator, while in a second embodiment, there is disclosed an optical modula…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.