Abstract
A frequency modulated (FM) analog optical link using an FM discriminator
is analyzed. Figures-of-merit are derived, including expressions for the
second-order (OIP2) and third-order intercept points (OIP3), spurious-free
dynamic range (SFDR) and noise figure (NF). It is found that a discriminator
with linear field transmission and constant group delay will produce no
third-order or higher-order distortions, and balanced detection will
suppress the remaining second-order distortion. Low biasing the
discriminator is found not to improve the NF of the link. Residual intensity
modulation (IM) of the laser is shown to significantly increase the link's
distortion. A discriminator using tenth-order finite-impulse response (FIR)
filters implemented in planar lightwave circuits (PLC) is proposed and shown
to improve OIP3 by 31 dB over a Mach-Zehnder interferometer (MZI)
discriminator.
© 2009 IEEE
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