Title :
Implementation and evaluation of a dual parallel linearization system for AM-SCM video transmission
Author :
Brooks, J.L. ; Becker, R.A.
Author_Institution :
Raynet Corp., Menlo Park, CA
fDate :
1/1/1993 12:00:00 AM
Abstract :
An externally modulated transmitter was linearized for AM subcarrier multiplexing (AM-SCM) video transmission. Linearization was accomplished by combining the outputs of two lithium niobate Mach-Zehnder interferometers which were simultaneously modulated. By controlling the optical and RF power at each modulator, more than 20 dB of third-order distortion cancellation was demonstrated for a multitone video spectrum. Results are presented for both NTSC and PAL B/G frequency plans. The effects of modulator nonideality on system performance are analyzed and confirmed experimentally. In particular, overall system performance is shown to be very sensitive to acoustic effects and to optical and electrical multipath interference. System modeling is used to provide tolerances on various critical parameters
Keywords :
amplitude modulation; electro-optical devices; integrated optics; light interferometers; lithium compounds; optical links; optical modulation; phase modulation; subcarrier multiplexing; video signals; AM-SCM video transmission; LiNbO3; Mach-Zehnder interferometers; RF power; acoustic effects; dual parallel linearization system; electrical multipath interference; electrooptical devices; externally modulated transmitter; modulator nonideality; multitone video spectrum; optical interference; optical links; optical modulation; optical power; phase modulation; subcarrier multiplexing; system performance; third-order distortion cancellation; Acoustic distortion; Lithium niobate; Optical control; Optical distortion; Optical interferometry; Optical modulation; Optical sensors; Optical transmitters; Radio frequency; System performance;
Journal_Title :
Lightwave Technology, Journal of
