Apparatus and method for fiber optics communication with dark cu

Optical: systems and elements – Deflection using a moving element – Using a periodically moving element

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Details

25014B, 359161, H04B 1024

Patent

active

051192241

ABSTRACT:
The disclosure is directed to an apparatus and method for receiving and processing an optical signal representative of electronic information. In an embodiment of the invention there is provided a light-emitting diode which is reverse biased to receive the optical signal and convert the optical signal to an electronic signal. Means are provided for determining time periods during which the electronic signal produced by the light-emitting diode is below a predetermined threshold. Means are provided for generating a dark current error signal indicative of a sampled output of the light-emitting diode during said time periods. Means are also provided for holding the error signal during other time periods when the electronic signal produced by the light-emitting diode is not below the predetermined threshold. Finally, means are provided for modifying the electronic signal produced by the light-emitting diode as a function of the held error signal to obtain an output electronic signal. In the disclosed embodiment, the light-emitting diode is reverse biased and coupled across an input of an operational amplifier which is arranged to produce an output voltage that depends upon the current in the light-emitting diode. A resistor is coupled between the output of the operational amplifier and the input of a voltage buffer. A threshold detector determines when the output of the voltage buffer is below a predetermined threshold, and produces an enable signal when the voltage buffer output is below the threshold. A sample-and-hold circuit samples the output of the buffer in response to the enable signal. The output of the sample-and-hold circuit is coupled via a resistor to the input of the voltage buffer. An output terminal is coupled to the output of the voltage buffer.

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patent: 4551762 (1985-11-01), Levine
patent: 4654891 (1987-03-01), Smith
patent: 4689826 (1987-08-01), Smith
patent: 4786969 (1988-11-01), Shouji
patent: 4820917 (1989-04-01), Ioannou

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