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Study on 4PAM Radio over Fiber System Using Self Mixing Technique

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Figure

Figure 2. Schematic diagram of 60 GHz 4 PAM-RoF optical transmission system set up (ECL: external cavity laser; EA: electrical amplifier; MZM: Mach-Zehnder modulator; EDFA: erbium doped fiber amplifier; PIN PD: positive intrinsic-negative photodiode; LPF:
Figure 3. Time-domain wave, frequency-domain and optical spectrum in different stage of transmission
Figure 4. The EVM curves of NRZ and 4 PAM signal after transmission over different length fiber

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