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:
May. 28, 1991
Filed:
Oct. 13, 1989
George E Bodeep, Point Pleasant, NJ (US);
Thomas E Darcie, Middletown, NJ (US);
Edward J Flynn, Summit, NJ (US);
Jan Lipson, Breinigsville, PA (US);
Carl J McGrath, Atkinson, NH (US);
Charles B Roxlo, Bridgewater, NJ (US);
Mark S Schaefer, Salem, NH (US);
L C Upadhyayula, Macungie Township, Lehigh County, PA (US);
AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
An amplitude-modulated vestigial-sideband, television channel sub-carrier multiplexed optical fiber transmission system includes a laser diode operating linearly throughout the desired range of multiplex frequencies. Such linear laser diode operation is accomplished by limiting leakage current within the laser diode to a very low level. The composite second-order distortion in the optical output signal from the laser diode is down typically 50 db from the video carrier for each channel. For some laser diodes that exhibit slow turn-on in the L-I characteristic, there is a point of inflection in the L-I curve. Operation with the laser biased at or near this point results in extremely linear performance, even though the laser may have insufficient blocking of leakage current to otherwise produce acceptable linearity.