Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1980-02-13
1982-05-04
Lee, John D.
Optics: measuring and testing
Range or remote distance finding
With photodetection
350 9612, 350358, 356350, 357 19, G02B 5174
Patent
active
043279627
ABSTRACT:
A double-heterojunction diode fabricated on a single crystal fiber which is voltage and acoustically controlled so as to alternately be caused to be a laser, an optical amplifier, or a detector of optical signals. A preferred embodiment utilizes gallium arsenide (GaAs) and gallium aluminum arsenide (GaAlAs). The double-heterojunction diode when electronically powered with the right polarity becomes an injection amplifier, with the addition of an acousto-optic grating of suitable period for feedback becomes a laser, and with a suitably reversed potential and different acoustic period becomes a heterodyne detector. In a preferred embodiment, the device is utilized to insert frequency controlled coherent optical or infrared signals in both directions in a fiber waveguide, amplify those signals, and detect the heterodyne difference frequency.
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Edelberg Nathan
Elbaum Saul
Gibson Robert P.
Lee John D.
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