Optimal Biasing of a Self-Homodyne Optically Coherent RF Receiver

<para> We present a technique that achieves the most efficient use of the linear dynamic range of available photodiodes without sacrificing the linearity of the radio-frequency (RF) digital receiver and photonic link based on optical phase modulation and coherent in-phase quadrature <formula formulatype="inline"><tex Notation="TeX">$(I/Q)$</tex> </formula> demodulation. We demonstrate, with a relative intensity noise (RIN)-limited optical system, that under these optimal bias conditions our 1-GHz coherent receiver achieves a link spurious-free dynamic range (SFDR), gain, and noise figure of 126.8 <formula formulatype="inline"><tex Notation="TeX">$\hbox{dB-Hz}^{2/3}$</tex></formula>, 8 dB, and 18.6 dB, respectively, and show the capability, with a shot-noise-limited optical source, to achieve an SFDR of 135.3 <formula formulatype="inline"><tex Notation="TeX">$\hbox{dB-Hz}^{2/3}$</tex></formula> and a noise figure of 6 dB. </para>

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