Hybrid analog-digital variable fiber-optic delay line
Abbreviated Journal Title
J. Lightwave Technol.
fiber Bragg grating (FBG); fiber delay line (FDL); optical delay; variable delay; PHASED-ARRAY ANTENNAS; TIME-DELAY; ARCHITECTURES; SWITCHES; Engineering, Electrical & Electronic; Optics; Telecommunications
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 51200 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.
Journal of Lightwave Technology
"Hybrid analog-digital variable fiber-optic delay line" (2004). Faculty Bibliography 2000s. 4744.