Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-10-26
1990-08-21
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
455612, H01J 516
Patent
active
049508873
ABSTRACT:
An optical fiber interface includes a detector assembly, which may include an integral fiber, for detecting an optical signal carried on a single fiber in an outbound direction and a piezo electric transducer or the like for providing relative movement between the fiber and the detector assembly to produce a modulated return optical signal in reflections of the outbound signal. The return optical signal has a lower frequency or data rate than the outbound signal. Several embodiments modulate the return signal by relative movement either perpendicular to or parallel to the fiber. The perpendicular movement modulates the reflected signal by varying alignment of the fiber and detector assembly, while the parallel movement modulates by varying a Fabry-Perot gap formed between the fiber and the detector assembly. One embodiment includes a cantilever beam of semiconductor material attached to the detector surface. The beam providing an integrated transducer and reflecting surface.
REFERENCES:
patent: 4195269 (1980-03-01), Ettenberg et al.
patent: 4709413 (1987-11-01), Forrest et al.
patent: 4741587 (1988-05-01), Jewell et al.
patent: 4815805 (1989-03-01), Levinson et al.
Hughes Richard P.
So Vincent C.
Vella Paul J.
Nelms David C.
Northern Telecom Limited
Smith Dallas F.
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