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Optimal Biasing of a Self-Homodyne Optically Coherent RF Receiver

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3 Author(s)
O'Connor, S.R. ; Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA ; Dennis, M.L. ; Clark, T.R.

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 (I/Q) 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 \hbox {dB-Hz}^{2/3} , 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 \hbox {dB-Hz}^{2/3} and a noise figure of 6 dB.

Published in:

Photonics Journal, IEEE  (Volume:2 ,  Issue: 1 )