Amplifiers – Parametric amplifiers – Semiconductor type
Patent
1978-03-30
1982-12-14
Moskowitz, Nelson
Amplifiers
Parametric amplifiers
Semiconductor type
372 8, 372 25, 332 751, 372 26, H01S 310
Patent
active
043640141
ABSTRACT:
An optical modulator is provided in which one light beam is modulated by another. The modulator of the invention includes a saturable medium which is capable of amplifying an optical signal by stimulated emission of radiation. Two optical signals, in the form of two light beams are caused to pass through the medium and to emerge from the medium in amplified form. The beams, however, are caused to have different gains in the medium either by causing the beams to have different path lengths, or by other means. The beams are intercoupled by cross-saturation of the medium. Thus, any variations in the intensity of one of the beams causes a change in intensity in the other beam. Since one of the beams has a greater gain than the other, a small change in the intensity of one of the beams will produce a large change in the intensity of the other beam, thus producing in many aspects the optical analog of the transistor. The modulator of the invention shall be referred to herein as an "opto-optic" modulator.
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Pheneger, "Interaction Effects Between Coupled Lasers", p. 116, Stamford Univ., Order No. 68-15,087, Thesis.
Roslear, "Laser Modulation Control Method", 8/69, p. 485, PBM Tech. Discl. Bull., vol. 12, #3.
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