Fade tolerant optical communication receiver
AssigneeNorthrop Grumman Systems Corporation
InventorsEduard Y. Luzhanskiy, James D. Crockett
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Abstract
A system includes a first low noise amplifier (LNA) having a first gain to amplify an optical input signal and to generate an amplified optical output signal. The first gain is set to compensate for signal losses in the optical input signal due to atmospheric fading. A second LNA having a second gain amplifies the amplified optical output signal from the first LNA and generates a saturated output signal when the combined first and second gain of the first LNA and the second LNA exceeds a predetermined output saturation level of a photo detector.
Claims20
A system comprising:
- a first low noise amplifier (LNA) having a first gain to amplify an optical input signal and to generate an amplified optical output signal, wherein the first gain is set to compensate for signal losses in the optical input signal due to atmospheric fading;
- and
- a second LNA having a second gain to amplify the amplified optical output signal from the first LNA and to generate a saturated output signal when the combined first and second gain of the first LNA and the second LNA exceeds a predetermined output saturation level of a photo detector.
An optical preamplifier comprising:
- a first low noise amplifier (LNA) having a first gain to amplify an optical input signal and to generate an amplified optical output signal, wherein the first gain is set to compensate for signal losses in the optical input signal due to atmospheric fading;
- a second LNA having a second gain to amplify the amplified optical output signal from the first LNA and to generate a saturated output signal when the combined first and second gain of the first LNA and the second LNA exceeds a predetermined output saturation level of a photo detector;
- and
- an optical attenuator to limit the saturated signal output of the second LNA from saturating the photo detector.
An optical preamplifier comprising:
- a first low noise amplifier (LNA) having a first gain to amplify an optical input signal and to generate an amplified optical output signal, wherein the first gain is set to compensate for signal losses in the optical input signal due to atmospheric fading;
- a first band pass filter that filters the amplified optical output signal generated by the first LNA to provide a first filtered output signal;
- a second LNA having a second gain to amplify the first filtered output signal from the first band pass filter and to generate a saturated output signal when the combined first and second gain of the first LNA and the second LNA exceeds a predetermined output saturation level of a photo detector;
- a second band pass filter that filters the saturated output signal generated by the second LNA to provide a second filtered output signal;
- and
- an optical attenuator to limit the second filtered output signal from the second band pass filter from saturating the photo detector.
Dependencies are inferred from the claim text.