Abstract
A simple method to achieve a large and tunable time delay of an optical
signal by using a linearly chirped fiber Bragg grating (LCFBG) written in
an erbium–ytterbium (Er/Yb) codoped fiber is proposed and demonstrated.
The group delay response of the LCFBG can be tuned by optically pumping the
LCFBG with different pumping powers, which leads to the tuning of the time
delay. An LCFBG written in an Er/Yb codoped fiber is fabricated. A continuously
tunable time delay up to 200 ps for a Gaussian pulse with a full-width at
half-maximum of 7.6 GHz is experimentally demonstrated. The influence of the
dispersion, the magnitude and group delay ripples of the LCFBG on the time
delay performance, and also the stability of operation are investigated.
© 2011 IEEE
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