Abstract
This paper presents a detailed theoretical analysis to measure the photodiode non-linearity including the effect of the optical modulator in terms of output third-order intercept point (OIP3). Besides it, a polarization-based technique is proposed to mitigate the non-linearity of photodiode for a two-tone radio over fiber (RoF) link using Mach Zehnder modulator (MZM). OIP3 is measured for avalanche photodiode (APD) and PIN photodiode against offset voltage & extinction ratio of MZM, APD gain and distance. The numerical investigation carried out shows that the proposed polarization-based link yields higher values of OIP3 over the conventional link implying improved linearity in output. The electric spectrum obtained at the receiver end reveals that third order intermodulation distortion (IMD3) components are suppressed by almost 10dB through polarization-based RoF link compared to conventional links. Further, the eye diagram obtained also reports enhanced signal quality for the proposed link.
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Garg, D., Nain, A. Analysis and mitigation of photodiode non-linearity under the influence of optical modulator in multitone RoF link. J Opt 51, 482–490 (2022). https://doi.org/10.1007/s12596-021-00794-9
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DOI: https://doi.org/10.1007/s12596-021-00794-9