Calculating the CSO/CTB spectrum of CATV amplifiers and optical receivers

Author

Germanov, V.

Volume

44

Issue

3

fYear

1998

fDate

9/1/1998 12:00:00 AM

Firstpage

363

Lastpage

370

Abstract

The discrete CSO/CTB intermodulation distortion has a big influence on the CATV net quality. This article describes a new method to calculate the composite second order (CSO) and composite triple beat (CTB) intermodulation distortion spectrum for the full frequency range of a coaxial cable CATV amplifier for any input frequency plan. The calculation takes into account the output level ripple and preemphasis, using frequency dependent intermodulation coefficients. These coefficients have been established through CSO/CTB measurements on multichannel test systems for standard frequency plans at 5-8 intermodulation frequencies or on distortion arrays for the two (three) oscillator measuring test system. The defined intermodulation coefficients are unrelated to the frequency plan and the input/output level ripple. It is also possible to calculate the CSO/CTB spectrum caused by analogue channels within digital QAM channels. The results equally apply to optical CATV receivers. Simulation results have been verified using extensive data from multichannel measurement systems

Keywords

cable television; coaxial cables; intermodulation distortion; optical fibre networks; optical receivers; television receivers; video amplifiers; CATV amplifiers; CSO/CTB spectrum; analogue channels; coaxial cable CATV amplifier; composite second order intermodulation distortion spectrum; composite triple beat intermodulation distortion spectrum; digital QAM channels; distortion arrays; frequency dependent intermodulation coefficients; input frequency plan; intermodulation distortion; multichannel measurement systems; multichannel test systems; optical CATV receivers; optical receivers; output level ripple; preemphasis; Coaxial cables; Distortion measurement; Frequency measurement; Intermodulation distortion; Optical amplifiers; Optical distortion; Optical receivers; Semiconductor optical amplifiers; Stimulated emission; System testing;

fLanguage

English

Journal_Title

Broadcasting, IEEE Transactions on

Publisher

ieee

ISSN

0018-9316

Type

jour

DOI

10.1109/11.715324

Filename

715324