At&t Bell Laboratories

Bell Communications Research, Inc.

Jan Lipson

Thomas Edward Darcie

Charles B Roxlo

George E Bodeep

Stewart David Personick

Edward J Flynn

Steven S Cheng

Carl J McGrath

Mark Steven Schaefer

L C Upadhyayula

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.

Optical sub-carrier multiplex television transmission system using a

An optical distribution architecture is disclosed wherein wavelength stabilized continuous wavelength lasers are centrally positioned in tandem with star couplers to distributed laser power among a plurality of lightguide paths. The laser power apportioned to each such path may then be locally or remotely modulated thereby reducing the number of lasers required to equip a network. Advantageously, lightguide fibres are single mode and polarization maintaining.

Optical transmission

Growing community of inventors

Bethlehem, PA, United States of America

Jan Lipson