Abstract
A class-B microwave-photonic link using optical frequency modulation
(FM) and fiber-Bragg gratings (FBGs) is analyzed and results verified with
measurements. Input voltage is converted linearly to FM, and this FM is converted
by each FBG to intensity modulation. For small FM index <i>β</i>, the signal increases as <i>β</i><sup>3</sup>, becoming linear in <i>β</i> with a frequency offset or carrier leakage, and
third-order distortion resulting from the detection process is shown to be
worse than that obtained using a Mach–Zehnder intensity modulator at
the same modulation index. For large <i>β</i>
(> 10), third-order distortion approaches zero and ideal
class-B operation is predicted, and the only shot noise and relative intensity
noise (RIN) added is that which arises from the detected signal power.
© 2008 IEEE
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