An optimized scheme was proposed to generate optical triangular pulses by using chirped fiber Bragg grating(FBG) and Mach-Zehnder modulator. Optical triangular pulses were obtained based on dispersion character of standard single-mode fiber substituted for a chirped FBG combined with optical carrier suppression modulation. The obtained triangular pulses' linear feature was optimized by simulation analysis of length, modulation index, and appropriate apodization of FBG. The simulation results indicate that the distortion of finally generated triangular pulses increase with the modulation index′s raising under the same chirp coefficient. The length of fiber grating and the apodization also have an obvious impact on the triangular pulses. Compared with the present generator, the proposed system has distinct advantages of simple configuration and the triangular pulses have better linear characteristic own to the small size chirped fiber grating replacing the long distance optical fiber.