The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 22, 1991
Filed:
Aug. 10, 1989
Arnold M Frisch, Portland, OR (US);
Thomas A Almy, Tualatin, OR (US);
Tektronix, Inc., Beaverton, OR (US);
Abstract
A low distortion optic fiber network having a feedback system which injects pilot tones into a base band input signal directly modulating an LED, optically detects the output resulting from the pilot tones, digitally samples the detected signal, and generates correction coefficients. The correction coefficients and the base band input signal are input to a correction circuit that pre-distorts the input signal in a non-linear manner and uses the distorted signal to modulate the LED. Pre-distorting the LED input signal compensates for the non-linearities of diode transfer characteristics and intermodulation between signals in the network thereby reducing harmonic and intermodulation distortion.