Significant suppression of the third intermodulation distortion in transmission system with optical feedforward linearized transmitter

Although the field applications of conventional optical feedforward transmitters were limited due to stationary transmission distance, the proposed optical feedforward transmitter overcame the limitations using vector control theory. A vector control circuit achieved perfectly the third-order intermodulation (IMD3) suppression regardless of distance or dispersion. The experimental results show that the IMD3 for two-tones was suppressed by maximum 38 dB even after 20 km. This work shows that the proposed optical feedforward transmitter is applicable to optical fiber radio transmission system.