Opto-acoustic transducer and telephone receiver

Details Opto-acoustic transducer and telephone receiver Opto-acoustic transducer and telephone receiver

1981-01-19

1982-06-08

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455612, 455619, 350 9629, 179110R, H04B 900

Patent

active

043343210

ABSTRACT:
An optical fiber element of low density, low heat capacity, a large coefficient of thermal expansion, and a large Young's modulus varies in light transmissivity gradually between its ends from high transmissivity to opacity, whereby power modulated light transmitted through the fiber element is absorbed to cause a change in temperature of the fiber element and a resultant thermal expansion and contraction thereof. As a transducer in a telephone receiver, a light absorbing fiber element or group of such elements is coupled between the optical fiber waveguide in the receiver and a resiliently mounted acoustical diaphragm which is caused to respond over the audible range.

REFERENCES:
patent: 254642 (1882-03-01), Hale
patent: 345084 (1886-07-01), Spaulding
patent: 3175088 (1965-03-01), Herriott
patent: 3314306 (1967-04-01), Alabaster et al.
patent: 3466446 (1969-09-01), Fassett
patent: 4002897 (1977-01-01), Kleinman et al.
patent: 4310731 (1982-01-01), Carlsen

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