In order to generate a high quality multicarrier, the phenomenon caused by different phase deviation of radio frequency was analysed. In this paper, the theoretical analysis revealed that the quality of multicarrier would deteriorate gradually when the phase deviation decreases from 90° to 0°. But when phase deviation is slightly different from 90°, the quality of multicarrier is good enough for the application of optical communication. In the experiment, the qualities of multicarriers with phase deviation of 90°, 45° and 0° were compared. The best performance is obtained at 90°. Under the 45° phase deviation, fifty carriers can also be otainted, but the quality decreases slightly that is good enough to apply to optical communication. And a multicarrier under 0° phase deviation cannot be obtained.