Abstract
We present a novel dispersion equalizer design for the compensation
of chromatic dispersion and chromatic dispersion slope in WDM systems. The
device is based on a cascade of complex quasi-periodic chirped fiber Bragg
gratings. We show that the use of a low chirp results in the distribution
of the resonating cavities along the optical fiber length, which allows reconfiguration
of the spectral characteristics by the application of a temperature profile.
This paper exposes in detail the numerical techniques used in the optimization
of the fiber Bragg grating filters taking into account fabrication imperfections.
We present a specific design for a 32-channel dispersion equalizer for 10
Gbit/s and a 50-GHz channel spacing. We examine the spectral characterization
of a device fabricated using a phase-apodized mask for various settings of
the chromatic dispersion profile. We demonstrate a tuning range of ± 800 ps/nm over
a bandwidth of 30 GHz. On average, the standard deviation of the phase ripple
was below 0.1 rad. Finally, we evaluate the performance of this device by
bit error rate measurements.
© 2008 IEEE
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