A scheme for generating broadband optical frequency comb was proposed and numerically simulated. For this scheme, a 1 550 nm vertical-cavity surface-emitting laser under a large signal current modulation with a modulation frequency of f_m=f₀/n (f₀ is the frequency interval of two orthogonal polarization components of a 1 550 nm vertical-cavity surface-emitting laser, n is an integer) can output an optical frequency comb in the dominant Y polarization component direction while the X polarization component is suppressed. By further introducing a linearly polarized optical injection, both the two polarization components (spectral main-peak ratio less than 15 dB) can output optical frequency combs. Finally, via a polarizer the two optical frequency combs with orthogonal polarization components can be decomposed by spectral splicing to obtain a broadband optical frequency comb. Based on the spin-flip model, the optical frequency comb performances of generated by this scheme is numerically investigated. The numerical results demonstrate that, when the bias current of a 1 550 nm vertical-cavity surface-emitting laser with a threshold current of 2.6 mA is set at 11.5 mA, the Y polarization component dominates while the X polarization component was suppressed, and the ratio of the main spectral peaks of the two polarization components is more than 30 dB. Under a current modulation with a large modulation index, only the Y polarization component of the laser can realize an optical frequency comb output. By further introducing a linearly polarized optical injection, both two polarization components can output optical frequency combs by adjusting the polarization direction of the linearly polarized light. Finally, a polarizer is used to guide the two polarization components to the transparent direction of the polarizer to achieve the spectral splicing, and then an optical frequency comb with a bandwidth more than 80 GHz can be obtained.