Abstract
We propose and experimentally demonstrate an approach to generating large
time-bandwidth product (TBWP) microwave arbitrary waveforms based on optical
pulse shaping using a single spatially discrete chirped fiber Bragg grating
(SD-CFBG). The SD-CFBG functions to perform simultaneously spectral slicing,
frequency-to-time mapping, and temporal shifting of the input optical pulse,
which leads to the generation of an optical pulse burst with the individual
pulses in the burst temporally spaced by the time delays determined by the
SD-CFBG. With the help of a bandwidth-limited photodetector (PD), a smooth
microwave waveform is obtained. The SD-CFBG is fabricated using a linearly
chirped phase mask by axially shifting the photosensitive fiber to introduce
a spatial spacing between two adjacent sub-gratings during the fabrication
process. By properly designing the fiber shifting function, a large TBWP
microwave arbitrary waveform with the desired frequency chirping or phase
coding can be generated. An equation that relates the fiber shifting
function and the microwave waveform frequency chirping is derived. The
photonic generation of large TBWP microwave waveforms with a linear,
nonlinear and stepped frequency chirping is experimentally
demonstrated.
© 2010 IEEE
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