Method and arrangement for increasing the dynamic range at an input stage of an optical receiver
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United States of America Patent
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Feb 14, 1989
Grant Date -
N/A
app pub date -
Dec 15, 1986
filing date -
Dec 15, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a method and arrangements for increasing the dynamic range at an input stage of an optical receiver, which input stage comprises a photodiode acting as a photodetector and an amplifying means the input of which is connected to one terminal of the photodiode. The input of the amplifier is connected to a diode attenuator the dynamic resistance of which is adjusted by means of a direct current proportional to the received optical level and substantially greater than the peak value of the detected signal current. At low levels of the optical signal the diode attenuator is brought into a high-impedance state.
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