With the recent data rate increase it is very challenging to build a fibre optic network that would enable a high data rate transmission over a long haul distance. The signal suffers large degradation over a certain distance due to distortion by the nonlinear effects of the optical fibres. In particular, transmission of high data rates over existing fibre optic systems, while keeping the cost low, avoiding an increase of the system's complexity and the usage of expensive devices, would be a very challenging task. In this paper, we address this problem by increasing the transmission distance in the fibre optic links for up to 2500km. We have used Standard Single Mode Fibre (SSMF) and Dispersion Compensation Fibre (DCF), where DCF is used as a loss compensator in Radio-Over-Fibre (RoF) systems. A mixture combination of the pre, post and symmetrical fibre compensation schemes were developed to overcome the dispersion in the fibre. We have found that in order to achieve high RF over fibre optic system performance for high data rates and long transmission, there is a requirement to upgrade the optical configuration scheme in a proportional way, by raising the length of the fibre span, compensation span and amplification. We have reported optimised RF over fibre configuration schemes that would have a great impact on reducing the cost, reducing the system's complexity and avoiding usage of expensive devices, in order to achieve high data rate transmission over existing fibre optic systems.
In this paper, a high linear Analogue Microwave Photonic Link (AMPL) is proposed and experimentally demonstrated by unique ways of deploying Gallium Arsenide (GaAs), two Electro-optic Mach-Zehnder Modulators (MZMs), and Balanced Photo detector (BPD). All even and odd intermodulation distortions products are suppressed under noise floor. Second Order Harmonics (SOH) are also significantly suppressed by careful arrangements of microwave shifters and MZMs. The proposed configuration of AMPL is a single-side band. We have also developed and implemented a full mathematical model for proposed configuration, and linearization of the system is tested by introducing an additional RF signal. Our experimental measurements exhibit the suppression under the noise floor of all even and odd IMD and significant suppression of SOH. Spurious Free Dynamic Range (SFDR) of the proposed analogue photonic link for a linearized signal is 119.5 dB.Hz2/3. The proposed novel AMPL would have a great impact on future aerospace, defense and satellite-to-ground downlink communication systems applications.
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