Abstract
There is great interest in finding a way to control the propagation speed of
optical pulses through a medium. A pulse delay control technique that uses a dispersive
medium and wavelength conversion has attracted a lot of attention because it is
transparent as regards the format or bit rate of incoming signals. However, a long
length of fiber is needed to obtain a sufficient delay in the delay line. In this paper,
we propose a tunable optical delay line with a highly dispersive dual concentric core
fiber (DCCF) that enables us to obtain a large time delay efficiently. The fabricated
DCCF has a minimum dispersion of - 2800 ps/nm/km, and has the potential to generate
a 54 ns/km delay by employing wavelength conversion within the <i>C</i>-band. We also evaluate
the signal quality by measuring the bit error rate characteristics of the delayed
signals through the proposed delay line.
© 2011 IEEE
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