High-fidelity lightwave transmission of multiple AM-VSB NTSC signals

Author

Lipson, Jan ; Upadhyayula, L. Chainulu ; Huang, Sun-Yuan ; Roxlo, Charles B. ; Flynn, E.J. ; Nitzsche, Paul M. ; Mcgrath, Carl J. ; Fenderson, Gerald L. ; Schaefer, Mark S.

Author_Institution

AT&T Bell Lab., Breinigsville, PA, USA

Volume

38

Issue

5

fYear

1990

fDate

5/1/1990 12:00:00 AM

Firstpage

483

Lastpage

493

Abstract

The progress towards developing AM lightwave links for the transmission of multiple TV signals is reported. While the signal-quality objectives and transmission distances are appropriate for CATV trunking, the technology is expected to have applicability to the distribution of video signals in the subscriber loop. Highly linear 1.3-μm distributed feedback (DFB) lasers designed expressly for analog requirements are used to transmit 42 continuous wave carriers according to the standard US CATV frequency plan. For the best lasers, when evaluated over 12 km of fiber, carrier to noise was >52 dB, composite second-order distortion was >70 dBc, and composite triple beat was >70 dBc. The relationship between measurements with continuous wave carriers and actual video signals is discussed. System design rules are offered. Properties that lead to superior analog performance are discussed. Data from 700 links indicate that composite third-order distortion generally scales with product count but that composite second-order distortion has a significant frequency-dependent component

Keywords

cable television; community antenna television; distributed feedback lasers; frequency division multiplexing; optical communication equipment; optical fibres; optical links; semiconductor junction lasers; subscriber loops; 1.3 micron; 12 km; 52 dB; AM lightwave links; C/N ratio; CATV trunking; CW carriers; DFB lasers; analog modulation; carrier to noise ratio; composite second-order distortion; composite third-order distortion; composite triple beat; continuous wave carriers; distribution of video signals; lightwave transmission; linear lasers; multiple AM-VSB NTSC signals; signal-quality objectives; standard US CATV frequency plan; subcarrier multiplexing; subscriber loop; transmission distances; transmission of multiple TV signals; Appropriate technology; Distributed feedback devices; Fiber lasers; Frequency; Laser feedback; Laser noise; Optical design; Optical fiber subscriber loops; Subscriber loops; TV;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.54915

Filename

54915