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Generation and control of optical signals in a wide wavelength range is of significant importance in optical gates and coherent control. Optical signals of two different wavelengths in the IR regime were generated in atomic Rb vapor using broad bandwidth laser pulses, and competition between the two signals was observed. The effects of pump laser intensity, chirp of laser pulses and Rb number density on the characteristics of the two signals were investigated. The results show that the two signals were generated from two coupled parametric sixwave mixing processes, and the signals vary with pump laser intensity, chirp of pump laser pulses and Rb number density. Moreover, the competition between the two signals was dominantly governed by phase matching conditions closely related to Rb number density. [ABSTRACT FROM AUTHOR]