Title :
Tunable microwave fiber-optic bandpass filters
Author :
Hunter, David B. ; Minasian, Robert A.
Author_Institution :
Sch. of Electr. & Inf. Eng., Sydney Univ., NSW, Australia
fDate :
7/1/1999 12:00:00 AM
Abstract :
A new photonic filter which can realize both high-resolution bandpass microwave response and which is also widely tunable is presented. This is based on the use of long chirped Bragg gratings and a section of active fiber, and tuning is obtained by changing the carrier wavelength. A fractional tuning range of 20% is demonstrated experimentally, and this can readily be extended. A model is presented to describe the frequency limitations of the filter, and design guidelines are given to overcome the grating dispersion limits. The new structure enables the realization of wide-band continuously tunable filters with fast tuning and high-Q.
Keywords :
band-pass filters; diffraction gratings; microwave photonics; optical fibre filters; optical tuning; active fiber; carrier wavelength; design guidelines; fast tuning; fractional tuning range; grating dispersion limits; high-Q; high-resolution bandpass microwave response; long chirped Bragg gratings; photonic filter; tunable microwave fiber-optic bandpass filters; wide-band continuously tunable filters; widely tunable; Band pass filters; Bragg gratings; Fiber gratings; Frequency; Laser tuning; Microwave filters; Optical fiber filters; Optical fibers; Optical filters; Tunable circuits and devices;
Journal_Title :
Photonics Technology Letters, IEEE
