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The feasibility of using a frequency-modulated laser followed by an interferometer in a subcarrier multiplexed system is considered. It is found that a Fabry-Perot is not sufficiently linear for multichannel AM-VSB systems. A Mach-Zehnder has acceptable performance only if the losses in each arm of the interferometer are balanced, and a high-power laser diode is used.
Inspec keywords: frequency modulation; cable television; community antenna television; laser beam applications; frequency division multiplexing; optical communication equipment; optical modulation; light interferometers
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Subjects: Laser applications; CATV and wired systems; Modulation and coding methods; Optical communication