Abstract
We demonstrate a millimeter-wave (mm-wave) synthesizer based on spectral
filtering of the ${\pm}2$ harmonics of a phase-modulated (PM) laser. Optical filters with
narrow passband, good extinction ratio and tunable peak wavelengths are
obtained by introducing distributed phase-shifts in a chirped fiber Bragg
grating (CFBG) using current-controlled heating elements. Detailed modeling
and analysis of the filter is performed using the effective index model and
coupled-mode theory. We present several optimization criteria to customize
the grating design and two experimental configurations are tested. The more
flexible approach is based on a fiber Mach–Zehnder structure with
a tunable phase-shifted CFBG in each arm. We show generation of mm-wave from
33 GHz to 48GHz, with a maximum frequency
limited by the bandwidth of the photodetector.
© 2009 IEEE
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