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A theoretical analysis is performed of transmission of optical signals in a fiber-optic link with external light intensity modulation by an electro-optic dual-drive Mach-Zehnder modulator and direct detection of the signals. The most general analytical expressions are obtained for the optical signals at the output from the modulator and at the receiving end of the fiber-optic link. Special attention is paid to the single-sideband-with-carrier (SSB+C) and the double-sidebands-withsuppressed-carrier (DSB+SC) modulation formats. A family of new SSB+C modulation formats of dual-drive Mach-Zehnder modulator is determined. Within the framework of linear approximation, the explicit expressions for SSB+C and DSB+SC optical signals are obtained. Transmission of such signals without dispersion-induced power degradation is clearly demonstrated.

GENERATION OF OPTICAL SIGNALS RESISTANT TO DISPERSION-INDUCED POWER DEGRADATION