Abstract
In this paper, an optically controlled tunable delay scheme has been proposed
using four-wave mixing (FWM) wavelength conversion in a 35-cm highly nonlinear
bismuth-oxide fiber (Bi-NLF) together with group velocity dispersion (GVD) in a chirped
fiber Bragg grating (CFBG). The Bi-NLF offers a very large nonlinearity and gives rise
to significant FWM over a short fiber segment. With the use of a CFBG, a delay range
over 185 ps has been experimentally demonstrated. To investigate the performance of the
tunable delay, we have applied the scheme for variable delays of 10-Gb/s amplitude-shift
keying (ASK) and differential phase-shift keying (DPSK) data signals. The bit error rate
(BER) measurements show a power penalty of less than 3.5 dB for both amplitude- and
phase-modulated data formats. To further increase the delay time, the CFBG has been
replaced by a dispersion compensated fiber (DCF) that provides a wider bandwidth of
operation. A variable delay up to 840 ps has been obtained using dual-pump FWM that
offers a conversion bandwidth of about 40 nm. The large conversion range helps to
minimize GVD-induced pulse distortion as a shorter DCF can be used for a given delay.
The Bi-NLF provides an enhanced stimulated Brillouin scattering (SBS) threshold, a
reduced latency, and an increased compactness of the approach for practical
applications.
© 2008 IEEE
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