Metal working – Plural diverse manufacturing apparatus including means for... – Common reciprocating support for spaced tools
Patent
1982-05-20
1984-04-03
Ozaki, G.
Metal working
Plural diverse manufacturing apparatus including means for...
Common reciprocating support for spaced tools
29576E, 29572, 29591, 148171, 148175, H01L 2120
Patent
active
044399103
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.
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Katz et al., Appli. Phys. Lett., vol. 37(2), Jul. 15, 1980, pp. 211-213.
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Bethurum W. J.
Collins David W.
Hughes Aircraft Company
Karambelas A. W.
Ozaki G.
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