Title :
Improvements in fiber-optic transmission of multicarrier TV signal
Author :
Berceli, Tibor ; Frigyes, István ; Gottwald, Péter ; Herczfeld, Peter R. ; Mernyei, Ferenc
Author_Institution :
Dept. of Electr. Eng., Tech. Univ. of Budapest, Hungary
fDate :
5/1/1992 12:00:00 AM
Abstract :
When the number of TV channels is high, a significant harmonic and intermodulation distortion arises. These distortions can be reduced by improving the modulation linearity of the laser or by applying a more appropriate modulation method. Both solutions are discussed and evaluated in detail. The linearity has been significantly improved by applying an active matching technique. The improvement achieved by the new driving circuit over the conventional one is 15 dB considering the third harmonic distortion. The sensitivity of QPSK TV transmission to disturbing interferences has been investigated. A so-called group modulation method offers a better approach for optical multicarrier TV transmission
Keywords :
cable television; carrier communication; intermodulation; optical links; optical modulation; phase shift keying; television interference; IMD; QPSK TV transmission; active matching; driving circuit; fiber-optic transmission; group modulation method; intermodulation distortion; laser modulation linearity; multicarrier TV signal; optical fibre links; third harmonic distortion; Circuits; Fiber lasers; Harmonic distortion; Intermodulation distortion; Laser noise; Linearity; Optical distortion; Optical modulation; Quadrature phase shift keying; TV interference;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
