Title :
Optically Controlled Low-Distortion Delay of GHz-Wide Radio-Frequency Signals Using Slow Light in Fibers
Author :
Zadok, Avi ; Raz, Oded ; Eyal, Avishay ; Tur, Moshe
Author_Institution :
Fac. of Eng., Tel-Aviv Univ.
fDate :
4/1/2007 12:00:00 AM
Abstract :
Continuously tunable delay of broadband analog signals for microwave photonics applications is described and demonstrated, based on stimulated Brillouin scattering (SBS) in optical fibers. The optical spectrum of the pump laser is synthesized using chirp control, in order to obtain a broadened SBS "slow light" process, with long delay and low amplitude and phase distortions. The resulting SBS process is applied to delay 1-GHz-wide linear frequency modulated radio-frequency signals of arbitrary carrier frequency. Delays up to 230 ps are observed, with a worst-case sidelobe suppression ratio of -26 dB
Keywords :
chirp modulation; delays; microwave photonics; optical distortion; optical fibres; optical pumping; radio-over-fibre; stimulated Brillouin scattering; 1 GHz; 230 ps; analog signals; broadband signals; chirp control; continuously tunable delay; delays; linear frequency modulation; low-distortion delay; microwave photonics; optical fibers; optical spectrum; optically controlled delay; phase distortions; pump laser; radiofrequency signals; side-lobe suppression ratio; slow light; stimulated Brillouin scattering; Brillouin scattering; Chirp modulation; Delay; Fiber nonlinear optics; Lighting control; Optical control; Radio control; Radio frequency; Slow light; Stimulated emission; Microwave photonics; optical antenna beam-forming; optical signal processing; slow light; stimulated Brillouin scattering (SBS);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.891980
