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US 6,862,322 B1Granted
Switchable-bandwidth optical receiver
AssigneeInternational Business Machines Corporation
InventorsJohn Farley Ewen, William K. Hogan, Kenneth Paul Jackson, Michael William Marlowe, Clint Lee Schow
Life of this patent
Estimating the term…
Abstract
A switchable bandwidth optical receiver is implemented in a front-end of the receiver in at least one of three ways. A switchable impedance may be provided at the input to a preamplifier of the front end, the preamplifier of the front-end may have a switchable impedance therein, and/or a switchable filter may be provided at an output of the preamplifier.
Claims16
An optical receiver comprising:
- an optical signal detector for detecting an optical input signal and producing an output in accordance with the optical input signal;
- a preamplifier coupled to receive the output from the optical signal detector and amplify the output signal;
- and
- means for changing the bandwidth of the optical receiver based on the bit-rate of the optical input signal, wherein the means for changing the bandwidth of the optical receiver comprises:
- at least one switchable impedance disposed between the optical signal detector and the preamplifier.
2 more elements
An optical receiver comprising:
- an optical signal detector for detecting an optical input signal and producing an output in accordance with the optical input signal;
- a preamplifier coupled to receive the output from the optical signal detector and amplify the output signal;
- and
- means for changing the bandwidth of the optical receiver based on the bit-rate of the optical input signal, wherein the means for changing the bandwidth of the optical receiver comprises at least one switchable filter disposed at an output of the preamplifier.
1 more element
An optical receiver comprising:
- an optical signal detector for detecting an optical input signal and producing an output in accordance with the optical input signal;
- a preamplifier coupled to receive the output from the optical signal detector and amplify the output signal;
- and
- means for changing the bandwidth of the optical receiver based on the bit-rate of the optical input signal, wherein the means for changing the bandwidth of the optical receiver comprises:
- means for controlling a bias of the optical signal detector.
2 more elements
An optical receiver comprising:
- an optical signal detector for detecting an optical input signal and producing an output in accordance with the optical input signal;
- a preamplifier coupled to receive the output from the optical signal detector and amplify the output signal;
- and
- means for changing the bandwidth of the optical receiver based on the bit-rate of the optical input signal, wherein the optical signal detector and the means for changing the bandwidth of the optical receiver comprise a controlled-bias photodetector, the impedance thereof being proportional to the bias thereon.
1 more element
An optical receiver comprising:
- an optical signal detector for detecting an optical input signal and producing an output in accordance with the optical input signal;
- a preamplifier coupled to receive the output from the optical signal detector and amplify the output signal;
- and
- means for changing the bandwidth of the optical receiver based on the bit-rate of the optical input signal, wherein the means for changing the bandwidth of the optical receiver comprises a plurality of switchable filters disposed at an output of the preamplifier.
1 more element
Dependencies are inferred from the claim text.