Multiplex communications – Wide area network – Packet switching
Patent
1989-10-13
1991-05-28
Eisenzopf, Reinhard J.
Multiplex communications
Wide area network
Packet switching
370 1, 455609, 455611, 455618, H04J 100
Patent
active
050200496
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.
REFERENCES:
patent: 4101847 (1978-07-01), Albanese
patent: 4601027 (1986-07-01), Scarr et al.
patent: 4722081 (1988-01-01), Fujito et al.
patent: 4768186 (1988-08-01), Bodell
patent: 4893300 (1990-01-01), Carlin et al.
patent: 4953156 (1990-08-01), Olshansky et al.
T. E. Darcie et al., "Lightwave Multi-Channel Analog AM Video Distribution Systems", ICC, Jun. 1989, pp. 1004-1007.
T. E. Darcie et al., "Intermodulation and Harmonic Distortion in InGaAsP Lasers", Electronic Letters, Aug. 1985, vol. 21, No. 16, pp. 665-666; erratum, Electronic Letters, May 1986, vol. 22, No. 11, p. 619.
J. Milo et al., "InGaAsP Double-Channel-Planar-Buried-Heterostructure Laser Diode (DC-DBH LD) With Effective Current Confinement", Journal of Lightwave Technology, vol. LT-1, Mar. 1983, pp. 195-202.
Bodeep George E.
Darcie Thomas E.
Flynn Edward J.
Lipson Jan
McGrath Carl J.
AT&T Bell Laboratories
Eisenzopf Reinhard J.
Havill Richard B.
Negash Kinfe-Michael
Ranieri Gregory C.
LandOfFree
Optical sub-carrier multiplex television transmission system usi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical sub-carrier multiplex television transmission system usi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical sub-carrier multiplex television transmission system usi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-40999