 Transmission power control circuit |
| An object of the invention is in that the gate bias voltage of the RF power module is varied in ... |
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| Protected amplifier apparatus |
| In FIG. 1, an input lead 10 provides RF signals to an ALC (automatic level control) block gain ... |
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| Transmitter testing method |
| OF INVENTION While the present invention will be described more fully hereinafter with reference ... |
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| Digital premodulation filter |
| It is an object of the present invention to provide a digital premodulation filter circuit for ... |
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| Modulator having direct digital synthesis for broadband RF transmission |
| In accordance with the invention, a modulator is provided for use in the 5-40 MHz reverse channel ... |
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| Amplitude and phase error normalization of subcarrier generator |
| A subcarrier generator under a preferred form of the present invention includes a bandpass finite ... |
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| Signal processor |
| An object of the present invention is to provide a signal processor of the above known type, but ... |
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| Analog to digital converter |
| In view of the above-described problem of the prior art, it is an object of the present invention ... |
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| High frequency multichannel diversity differential phase shift (DPSK) communications system |
| The object of the present invention is to provide a multichannel diversity DPSK modulated ... |
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Fiber-optic feed network using series/parallel connected light emitting opto-electronic components
| Details |
Inventors: de La Chapelle, Michael; Hsu, Hui-Pin; Lewis, Gib F.; Mantele, John E.;
Assignee: Hughes Aircraft Company (Los Angeles, CA)
Primary Examiner: Lee; John D.
Assistant Examiner:
Attorney, Agent or Firm: Hays; R. A., Karambelas; A. W.
The corporate feed network employs light emitting opto-electronic components, such as laser diodes (12), connected together in a string (14) for distributing RF, microwave, MMW, digital signals, and pulse modulated light. Each diode provides two ports or facets which are coupled to optical fibers (16, 18) to connect to an active phased array antenna, for example. The diodes are selected in number and impedance to provide a good wideband impedance match to the RF/microwave/MMW/digital driving source. Multiple series strings of diodes may be employed, connected in parallel for larger corporate feed structures. |
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DETAILED DESCRIPTION What is claimed is: 1.
A fiber-optic feed network comprising: means for supplying RF feed energy; a first string of series connected light emitting optoelectronic components, said string having a preselected number of said optoelectronic components therein, said string being coupled to said means for supplying RF feed energy, said means for supplying RF feed energy having a characteristic impedance substantially matched by said optoelectronic components in said first string such that RF feed energy supplied by said means for supplying RF feed energy is efficiently converted to optical energy; and a plurality of fiber-optic cables, each of said optoelectronic components in said first string having at least one of said cables coupled thereto such that said fiber-optic cables provide a feed network for distributing said optical energy.
2.
The feed network of claim 1, wherein said feed energy is continuous wave energy.
3.
The feed network of claim 1, wherein said feed energy is pulsed energy.
4.
The feed network of claim 1, wherein said optoelectronic components comprise series connected laser diodes.
5.
The feed network of claim 4, further comprising a DC current source for biasing said diodes, said DC current source having means for isolating itself from said feed energy means.
6.
The feed network of claim 4, wherein each diode is optically coupled to two fiber-optic cables.
7.
The feed network of claim 4 wherein each diode has two optical energy emitting facets with each of said facets being optically coupled to one of said fiber-optic cables.
8.
The feed network of claim 1 further comprising: a plurality of other strings of series connected optoelectronic components, each said other string coupled in parallel with said first string, and each of said other optoelectronic components having at least one of said cables coupled thereto.
9.
The feed network of claim 8, wherein each said string has an equal number of series connected laser diodes.
10.
The feed network of claim 9 wherein said strings comprise two parallel strings of sixteen series connected laser diodes
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Audio Signal Processing 
