Abstract
This paper describes a phase-locked multicarrier light source that employs
a continuous wave (CW) light source, two phase modulators, and a dispersion
medium. A sinusoidal phase modulation (PM) with a modulation index of $\pi/4$ and a group
velocity dispersion of ${\pm}1/(4\pi
f_{m}^{2})$, where $f_{m}$ is the modulation frequency, are applied to a CW light followed
by a large sinusoidal PM. This configuration provides a multicarrier light
with a flattened optical power spectrum for any modulation index of the second
PM. By adopting a chirped fiber Bragg grating (FBG) as a dispersion medium
instead of a long normal dispersion fiber, we can increase the stability of
the optical output spectrum and reduce the size of the multicarrier light
generator. We have built a prototype with this configuration that generates
a 61-carrier light with a 25 GHz interval and a power deviation of less than
8 dB.
© 2009 IEEE
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