Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1987-08-05
1989-02-21
Moskowitz, Nelson
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
350373, 350378, G02F 109, H04B 900
Patent
active
048068853
ABSTRACT:
A magneto-electro-optic effect light modulator has a rectangular solid-like semiconductor element made of one member selected from the group of an n-type semiconductor, a p-type semiconductpr and an intrinsic semiconductor. The semiconductor element has no pn-junction and has a band-gap corresponding to the energy of infrared light concerned. Also provided are a magnet for applying a magnetic field H to the semiconductor element and electrodes for passing an electric current through the semiconductor element access the magnetic field. A power source supplies an electric current passing through the semiconductor element in order to modulate the light incident upon the semiconductor element. An entrance polarizer disposed in front of the semiconductor element linearly polarizes the infrared-light transmitting therethrough. An exit polarizer disposed behind the semiconductor element linearly polarizes the infrared-light transmitting therethrough, the exit polarizer has a polarization plane different form the entrance polarizer. The light modulator utilizes the population inversion causd by a cooperation of current J and magnetic field H to modulate the light incident upon the semiconductor element.
REFERENCES:
patent: 3247765 (1966-04-01), Cocca et al.
patent: 3580664 (1971-05-01), Bongers et al.
patent: 3899430 (1975-08-01), Johnson
patent: 4027948 (1977-06-01), Tanton et al.
patent: 4450460 (1984-05-01), Morimoto
Morimoto et al., "Characteristics of . . . Diode", J. Appl. Phys., Part 2, vol. 23, #11, pp. L821-823, 11/84, abst. only.
Morimoto et al., "Induced Absorption . . . Temperatures," Phys. Lett., vol. 110A, #9, pp. 473-476, 8/19/85.
Morimoto et al., "Light Amplification . . . InSb", Phys. Lett., vol. 104A, #1, pp. 55-58, 8/6/84.
Berman et al., "Luminescence of Hot Holes . . ," Fig. & Tekh., Poluprovadn, vol. 19, #3, pp. 369-377, 3/85, abst. only.
Lavallard et al., "Saturation of Optical . . . Crystals," Phys. Rev. B., vol. 16, #6, pp. 2804-2810, 9/15/77, abst. only.
Sorahin et al., "Standard Measures . . . of the Spectrum", Meas. Tech., vol. 22, #2, pp. 138-139, 2/79, Abst Only.
Little et al., "High-Resolution Magneto-Optical . . . ", Phys. Rev. B., vol. 27, #12, pp. 7473-7488, 6/15/83, Abst. Only.
Morimoto et al., "D/Sup-2/Thickness . . . Diode," JPN J. Appl. Phys., Part I, vol. 25, #2, pp. 289-296, 2/86, Abst.
Applied Optics, vol. 25, No. 12, Jun. 15, 1986, "Temperature-Stable Faraday Rotator Material and Its Use in High-Performance Optical Isolators", pp. 1940-1945, S. Matsumoto et al.
High-Efficiency Modulator for Infrared Laser Beams by Inter-Valence Band Transition in Germanium, Umeno et al., pp. 68-69, Department of Electronics. Nagoya University, Nagoya, Japan.
Springer Series in Solid-State Sciences, vol. 71: High Magnetic Fields in Semi-Conductor Physics, "Population Inversion and Anomalous Voight Effect Due to J.times.H Force in InSb", Morimoto et al., Institute of Atomic Energy, pp. 470-471.
Moskowitz Nelson
Sumitomo Electric Industries Ltd.
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