Abstract
We present a linearized phase-modulated analog photonic link that utilizes
parallel interferometric demodulation to suppress the third-order intermodulation
distortion present in the link. By utilizing two parallel interferometers
with different differential delays, we are able to balance the third-order
distortion in the output photocurrent and achieve a fifth-order limited link
response. We demonstrate shot noise-limited spurious-free dynamic ranges of ${\sim 130} $ dB
(1-Hz bandwidth) at ${\sim
1} $ GHz for a total DC photocurrent ${I_{dc}}\sim 8 $ mA and ${\sim 131} $ dB (1-Hz bandwidth) at ${\sim 5} $ GHz for
a total DC photocurrent ${I_{dc}}\sim 7 $ mA.
These results represent a nearly two order-of-magnitude improvement in dynamic
range over conventional intensity- or phase-modulated analog photonic links
for a fixed received photocurrent.
© IEEE
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