Abstract
We report the generation of fifty 12.5-GHz-spaced optical carriers with
high power flatness and stability by using a single-side band (SSB) modulator-based
recirculating frequency shifter (RFS). The peak-to-peak power difference and
the RMS power difference of the generated carriers are 2.5 and 0.3 dB, respectively.
We also experimentally investigate the impact of implementation imperfections
on the flatness of the generated carriers. The important factors that contribute
to the flatness of the generated carriers are found to be the amplitude balance
of two inphase (I) and quadrature (Q) drive signals for the SSB modulator,
the time misalignment between the I and Q signals, the accuracy of the $\pi/2$ phase bias
of the SSB modulator and the stability of the polarization alignment in the
RFS. By carefully controlling all the factors mentioned earlier, we obtain
stable operation of 50 frequency-locked carriers; showing that the SSB modulator-based
RFS is a promising technique for future terabit per second multicarrier transmission.
© 2011 IEEE
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