Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1985-07-12
1987-09-22
Orsino, Jr., Joseph A.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
350 9615, 356138, H04B 900
Patent
active
046960627
ABSTRACT:
A fiber optic switching system and method is described which is capable of rapidly switching among a number of closely spaced optical rods for optical connection with a communications channel, while alleviating alignment problems caused by vibration and similar environmental conditions. Focusing lenses are moved relative to stationary multirod cables, and brought into coarse alignment with desired rods in each cable in a programmed switching sequence. At each coarse lens position a fine alignment is achieved between the lens and rod by directing an optical alignment beam along the focal axis of the lens, reflecting the beam off the rod, and sensing the portion of the alignment beam which is reflected back through the lens as an indication of the misalignment. The misalignment detectors form part of a servomechanism that rapidly adjusts the lens position in response to detected misalignments to bring the lens into alignment with the desired rod. The alignment beam is preferably generated at a different frequency from the data signal, and beam directing elements associated with the servomechanism discriminate between the data and alignment beams so that the data beam is transmitted to a communications channel while the alignment beam is forwarded to the lens position control apparatus.
REFERENCES:
patent: 3781546 (1973-12-01), Christian et al.
patent: 4204742 (1980-05-01), Johnson et al.
patent: 4452506 (1984-06-01), Reeve et al.
patent: 4474469 (1984-10-01), Abe
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