Ka-band RF photonic link with optimized performance

We demonstrate an RF photonic link architecture operating over 26 – 40 GHz with optimized link performance. The link features optical pre-amplification in conjunction with low biasing of an ultra-highspeed external modulator. A + 27 dBm polarization maintaining fiber amplifier and a low drive voltage, 40 GHz GaAs mode-converter-based polarization modulator were used in the configuration. A spurious-free dynamic range in excess of 118 dB-Hz
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was measured across the entire Ka-band. The link gain was −15 dB and the noise figure estimated to be < 17 dB. A dither-free bias controller was also developed to achieve long-term stability of the Ka-band link.