Abstract
A multichannel photonic temporal differentiator implemented based on a
single multichannel fiber Bragg grating (FBG) for
wavelength-division-multiplexed (WDM) signal processing is proposed for the
first time to our knowledge. The multichannel FBG is designed using the
discrete layer peeling (DLP) algorithm together with the spatial sampling
technique. Specifically, the DLP algorithm is used to design the spectral
response of an individual channel, while the spatial sampling is employed to
generate a multichannel response. The key feature of the proposed temporal
differentiator is that WDM signals at multiple optical wavelengths can be
simultaneously processed. Two sampling techniques, the phase-only and the
amplitude-only, are employed. The use of the phase-only sampling technique
to design a 45-channel first-order and second-order temporal differentiator
is performed, and the use of the amplitude sampling technique to design a
3-channel first-order and second-order temporal differentiator is also
performed. A proof-of-concept experiment is then carried out. A 3-channel
first-order differentiator with a bandwidth of 33.75 GHz and a channel
spacing of 100 GHz is fabricated. The use of the fabricated 3-channel FBG to
perform first-order temporal differentiation of a 13.2-GHz Gaussian-like
optical pulse with different optical carrier wavelength is
demonstrated.
© 2011 IEEE
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