Cryogenic signal coupler having imaging lens within a thermal ba

Details Cryogenic signal coupler having imaging lens within a thermal ba Cryogenic signal coupler having imaging lens within a thermal ba

1991-11-18

1993-09-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

250238, 250332, G02B 2700

Patent

active

052471837

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 modulator associated with each light sensor, and the source light power to be modulated is selectively switched to only one modulator by an optical multiplexing arrangement.

REFERENCES:
patent: 4810978 (1989-03-01), Sato et al.

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