Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1989-11-01
1991-06-11
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
356352, H04B 1006
Patent
active
050239473
ABSTRACT:
An optical equalization receiver for countering the effects of delay distortion is realized by utilizing dynamically controllable Fabry-Perot etalon structures. By dynamically adjusting the frequency response of an etalon that is in a feedback loop configuration, the associated delay characteristic of the etalon may be used to counter the effects of delay distortion, thereby allowing higher transmission rates and transmission distances to be achieved. In one exemplary embodiment, an optical receiver comprising a reflective Fabry-Perot etalon and a piezoelectric transducer is used in a feedback loop configuration wherein a feedback control circuit monitors an output signal from the etalon for generating a control signal representing the amount of delay needed to compensate for distortion in an optical signal incident on the etalon. Specifically, the control signal causes a change in the optical path length of the etalon that results in a shift in its frequency response for producing a delay substantially equal and opposite to the associated delay distortion.
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Cimini, Jr. Leonard J.
Greenstein Larry J.
Saleh Adel A. M.
AT&T Bell Laboratories
Beek L. Van
Eisenzopf Reinhard J.
Ranieri Gregory C.
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