Coherent light generators – Particular component circuitry – Optical pumping
Patent
1980-09-29
1983-06-14
Edlow, Martin H.
Coherent light generators
Particular component circuitry
Optical pumping
357 19, 357 30, 357 38, 357 61, 372 50, H01L 3300, H01S 3319, H01L 2714, H01L 29161
Patent
active
043886337
ABSTRACT:
Modulated signal levels in the range of 1 .mu.V, as is typical for radar returns, can be used to achieve a useful modulated optical signal that can be launched into a fiber optic waveguide for transmission to a remote location for signal processing. The device of the invention achieves such a conversion by suitably integrating a high gain bipolar transistor with an electroluminescent diode, such as a light emitting diode or diode laser, into a compact monolithic structure.
In one structural configuration, the bipolar transistor comprises an emitter comprising a layer of doped n-(Al,Ga)As supported on a base comprising a layer of doped p-GaAs, in turn supported on a collector comprising a layer of undoped n-GaAs or n-(Al,Ga)As. The electroluminescent diode in this embodiment comprises a light-emitting diode formed by a p-n junction between the undoped n-GaAs or n-(Al,Ga)As layer and a supporting doped p-GaAs layer, in turn supported on a doped p.sup.+ -GaAs substrate. Collector contact is made to the backside of the substrate.
An electrical signal at the base is amplified by transistor action, resulting in a high gain optical output by the LED, which may be launched into an optical fiber in either a Burrus or edge-emitting configuration. Direct optical amplification of optical radiation may be made by omitting electrical contact to the base and introducing the optical radiation into the emitter.
REFERENCES:
patent: 2569347 (1951-09-01), Shockley
Transistors with high current gain, "Journal of Applied Physics", vol. 48, No. 10 (1977), pp. 4389-4394.
J. Katz, N. Bar-Chaim, P. C. Chen, S. Margalit, I. Ury, D. Wilt, M. Yust and A. Yariv, "A monolithic integration of GaAs/GaAlAs bipolar transistor and heterostructure laser", Applied Physics Letters, vol. 37, No. 2, (1980), pp. 211-213.
M. Konagai, K. Katsukawa and K. Takahashi, "(GaAl)As/GaAs heterojunction photo".
Bethurum W. J.
Carroll J.
Collins David W.
Edlow Martin H.
Hughes Aircraft Company
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