Abstract
A novel technique to generate binary phase-coded, direct-sequence
ultra-wideband (DS-UWB) signals in the optical domain is proposed and demonstrated.
In the proposed system, the wavelengths from a laser array are modulated by
a Gaussian pulse, which is sent to a multichannel optical frequency discriminator,
to generate a UWB monocycle or doublet pulse sequence with a predetermined
phase-code pattern. By tuning the wavelengths of the laser array, or by tuning
the states of polarization of the wavelengths, the generated pulse shape and
code pattern can be changed. The key device in the system is the multichannel
dispersive chirped fiber Bragg grating (FBG), which functions, in combination
with a dispersive fiber, as a multichannel frequency discriminator with a
step-increased group-delay response, to ensure the generated UWB sequence
to have uniform time spacing among the chips and to compensate for the fiber-induced
chromatic dispersion. The proposed scheme is experimentally demonstrated.
A multichannel chirped FBG is designed and fabricated. Binary phase-coded
DS-UWB signals with different code patterns are experimentally generated.
© 2008 IEEE
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