To reduce the complexity and commercial cost of radio over fiber (RoF) systems, this study proposes a modified uni-traveling carrier (MUTC) photodiode with a double Gaussian-doped absorption layer. Operating at 1 310 nm wavelength, the photodiode achieves high-speed and high-power output through precise electric field regulation, enabling direct antenna driving for signal transmission. Under a bias of -8 V, a 20 μm diameter photodiode demonstrates a 3 dB bandwidth of 30.9 GHz, a responsivity of 0.82 A/W, and peak radio frequency (RF) output powers of 34.8 dBm at 15 GHz and 34.4 dBm at 20 GHz.