Title :
Spectral filtering and dispersion penalties associated with broad-band sources in digital broadcast video delivery
Author :
Reichmann, Kenneth C. ; Frigo, Nicholas J.
Author_Institution :
Crawford Hill Lab., AT&T Bell Labs., Holmdel, NJ, USA
fDate :
4/1/1997 12:00:00 AM
Abstract :
Broadcast digital video with QPSK modulation has been delivered over WDM passive optical networks by using spectral slicing of broad-band sources such as LED´s. We compare a model for, and experimental measurements of, dispersion induced impairments in QPSK video transmission systems with broadband optical carriers. The model is a universal function of RF frequencies, PON fiber length, and source spectral width for any given spectral shape, and describes the functional form and major portion of the observed impairments. The system implications of spectral filtering for unamplified systems are also discussed.
Keywords :
digital television; electro-optical modulation; light emitting diodes; optical fibre dispersion; optical fibre subscriber loops; optical filters; quadrature phase shift keying; television networks; wavelength division multiplexing; LED; PON fiber length; QPSK modulation; RF frequencies; WDM passive optical networks; broad-band sources; broadband optical carriers; broadcast digital video; digital broadcast video delivery; dispersion induced impairments; dispersion penalties; source spectral width; spectral filtering; spectral shape; spectral slicing; unamplified systems; Digital filters; Digital modulation; Digital video broadcasting; Dispersion; Filtering; Optical filters; Passive optical networks; Quadrature phase shift keying; WDM networks; Wavelength division multiplexing;
Journal_Title :
Photonics Technology Letters, IEEE
