Coherent light generators – Particular beam control device – Modulation
Patent
1992-01-08
1993-06-22
Scott, Jr., Leon
Coherent light generators
Particular beam control device
Modulation
372 31, 372 6, H01S 310
Patent
active
052220893
ABSTRACT:
An amplified signal source is provided for transmitting modulated information signals over a fiber optic communication link, which may have high fiber dispersion. A continuous wave laser produces an optical carrier at a wavelength .lambda..sub.1. The optical carrier is intensity modulated to provide a substantially chirp free output signal. The output signal is amplified in an optical amplifier and coupled for transmission over a link fiber that can have a minimum dispersion at a wavelength .lambda..sub.2 that is different than .lambda..sub.1. The nonzero gain slope of the optical amplifier does not significantly degrade the substantially chirp free output signal.
REFERENCES:
Hurer et al; "20 Channel VSB-AM CATV Link Utilizing an External Modulator, Erbium Laser and a High Power Erbium Amplifier", Technical Digest Ofc '91, IEEE/Lasers and Electro-Optics Soc. 18-22 Feb. '91.
Trisno et al, "Video Multicast Using a VSB-AM External Modulator at 1.5 .mu.m"; IEEE Photonics Letts. vol. 3, No. 7; Jul. 1991.
E. E. Bergmann and C. Y. Kuo, "Dispersion Induced Composite Second Order Distortion in Lightwave Analog AM CATV Transmission at 1.55 um," 1990 LEOS Annual Meeting, Boston, Mass., Nov., 1990, Paper PD12.
W. I. Way, et al., "Multi-Channel AM-VSB Television Signal Transmission Using an Erbium-Doped Optical Fiber Power Amplifier," IOOC, Kobe, Japan, Jul. 20, 1989.
E. E. Bergmann, C. Y. Ruo and S. Y. Huang, "Dispersion-Induced Composite Second-Order Distortion at 1.5 um, " IEEE Photonics Technology Letters, vol. 3, No. 1., Jan. 1991, pp. 59-61.
C. Y. Kuo and E. E. Bergmann, "Analog Distortion in EDFA and its Electronic Compensation," Optical Amplifiers and Their Applications, IEEE OSA, Snow Mass Village, Colo., Jul. 24-26, 1991, Paper PdP10-1.
General Instrument Corporation
Jr. Leon Scott
Lipsitz Barry R.
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