Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1980-09-05
1982-05-18
Orsino, Jr., Joseph A.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455607, 455618, 455619, H04B 900
Patent
active
043308708
ABSTRACT:
The disclosed optical data link provides full-duplex, high-data rate optical communications between geographically separate data processing facilities by means of identical optical transceivers. Transmitter optics include an LED and a collimating Fresnel lens for providing a collimated, modulated light beam. Receiver optics include a focusing Fresnel lens and a photoreceptor for converting the impinging modulated light beam into corresponding electrical signals, which are amplified by a gain-controlled amplifier. The LED is selectively translatable along its optical axis to provide focal length correction for temperature-induced focal length distortion, while the photoreceptor is selectively translatable along its optical axis to provide, in addition to focal length correction, a preselected amount of optical energy attenuation. To control the output signal level from the gain-controlled amplifier, a microprocessor in the gain control loop is responsive to a signal level code to selectively enable successive levels of electronic attenuation in the gain-controlled amplifier, and, if the dynamic range of electronic attenuation is exhausted without achieving an optimum output signal level, to selectively adjust the level of optical attenuation by incrementally translating the photoreceptor. To control transmitted signal power, the microprocessor is responsive to a temperature indication code to translate the light emitting diode to the actual focal length of the associated Fresnel lens, thereby correcting temperature-induced focal length distortion and optimizing transmitted signal power.
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Datapoint Corporation
Orsino Jr. Joseph A.
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