Simultaneous Noise Reduction and Linearity Improvement of Optical Feedforward Transmitter for Radio over Fiber Systems

One of the major concern for the system is the issue of noise and interference. The majority source of nonlinearity come from laser diode nonlinearity. Likewise, the linearity improvement of optical transmitter is very important to enhance system performance in term of dynamic range. This paper demonstrated the simultaneous noise reduction and linearity improvement of optical transmitter using proposed feedforward linearization scheme for radio over fiber system. The system performance is predicted based on the simulation result in term of third order intermodulation distortion (IMD3) and relative intensity noise (RIN) reduction. The results show that simultaneous reduction of IMD3 up to 33 dB and RIN up to 20 dB employing the proposed system.