Abstract
A variable fiber-optic delay line (VFODL) is introduced that,to the
best of the authors' knowledge, is the first time that a hybrid
analog-digital VFODL is proposed to solve the dilemma of efficiently
enabling many settable and long-duration time delays together with
continuous and short time delays. In essence, this VFODL can provide
near-continuous high-resolution time generation across an entire
long-time-delay band. The VFODL is based on the concept of cascaded
wavelength-sensitive and wavelength-insensitive time delays. A
proof-of-concept VFODL built demonstrates near-continuous
0.5-ps-resolution time-delay control across an entire 25.6-ns time-delay
band generating a total of 51 200 measurable time-delay bins. The
experimental VFODL also gives a 4.95-dB total optical loss and a 1-ms
time-delay control-setting speed. The proposed VFODL can be used in
applications such as radio frequency photonic signal processing and radar
testing.
© 2004 IEEE
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