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Abstract
The key advantage of using phase modulation (PM) instead of intensity modulation (IM) in radio-over-fiber (RoF) link is that no bias circuitry is needed. However, proper demodulation is important for the PM link's performance. In this paper, PM with interferometric detection is low biased to get better performance. The theory of this scheme is fully investigated, including the expressions for link gain (G), noise figure (NF) and spur-free dynamic range (SFDR). Both the theory calculation and simulation results verify that the performance improvement of PM RoF link can be realized by tuning the laser wavelength without complicating the system configuration.