Title :
Fiber-optic tunable microwave transversal filter
Author :
Frankel, Michael Y. ; Esman, Ronald D.
Author_Institution :
Div. of Opt. Sci., Naval Res. Lab., Washington, DC, USA
Abstract :
A fiber-optic finite impulse response filter with continuously tunable unit time delays is developed and studied. The filter consists of eight taps with progressively longer segments of high-dispersion fiber, but completed with dispersion-shifted fiber to nominally identical overall lengths. The time delays through each tap are tuned by varying the wavelength of the optical carrier. The constructed 8-tap filter exhibits bandpass characteristics with a Q of 30. The bandpass band is continuously tuned over a full octave from under 9 GHz to over 18 GHz with a single low-voltage control signal that demonstrates the technique´s applicability to adaptive systems.<>
Keywords :
band-pass filters; delays; optical fibre dispersion; optical fibre filters; transient response; tuning; 8-tap filter; 9 to 18 GHz; adaptive systems; bandpass band; bandpass characteristics; continuously tunable unit time delays; dispersion-shifted fiber; fiber-optic finite impulse response filter; fiber-optic tunable microwave transversal filter; high-dispersion fiber; low-voltage control signal; octave; optical carrier; Adaptive systems; Band pass filters; Control systems; Delay effects; Finite impulse response filter; Microwave filters; Optical fiber filters; Optical filters; Programmable control; Transversal filters;
Journal_Title :
Photonics Technology Letters, IEEE
