A scheme of triangular-shaped pulses with full duty cycle generation is proposed and analyzed.Benefiting from the feature of orthogonal polarization,two approximate sinusoidal signals on different polarization states can be combined without inducing coherent interference.By tuning the time mismatching between the two signals,an approximately triangular-shaped profile can be obtained in the optical intensity.It is found that the modulation index β is no longer a fixed one,but it can be aligned within a proper range of 0.92 to 1.57.To evaluate the proposal,impacts of radio frequency voltage fluctuation,bias voltage drift,and time mismatching are discussed.Within the defined fitting error(η≤ 3%),the tolerable range of the modulation index,time mismatching,and voltage have been found,which insures a simple operation in practice. A scheme of triangular-shaped pulses with full duty cycle generation is proposed and analyzed. Benefit from the feature of orthogonal polarisation, two approximate sinusoidal signals on different polarization states can be combined without inducing coherent interference. By tuning the time mismatching between the two signals , an approximately triangular-shaped profile can be obtained in the optical intensity. It is found that the modulation index β is no longer a fixed one, but it can be aligned within a proper range of 0.92 to 1.57.To evaluate the proposal, impacts of radio frequency voltage fluctuation, bias voltage drift, and time mismatching are discussed. Since the defined fitting error (η ≦ 3%), the tolerable range of the modulation index, time mismatching, and voltage have been found, which insures a simple operation in practice.