Low-Distortion Long Variable Delay of Linear Frequency Modulated Waveforms

Author

Stern, Yonatan ; Klinger, Ofir ; Schneider, Thomas ; Jamshidi, Kambiz ; Peer, Avi ; Zadok, Avi

Author_Institution

Fac. of Eng., Bar-Ilan Univ., Ramat-Gan, Israel

Volume

4

Issue

2

fYear

2012

fDate

4/1/2012 12:00:00 AM

Firstpage

499

Lastpage

503

Abstract

The impulse response of 500-MHz-wide, linear frequency modulated (LFM) waveforms is delayed and advanced by 50 ns using microwave-photonic processing. The delays are obtained through the application of a variable frequency offset to a single optical sideband using an acousto-optic modulator. The peak-to-sidelobe ratio (PSLR) and integrated sidelobe ratio (ISLR) of the processed impulse response functions are higher than 18 and 20 dB, respectively, for the entire range of delay and advancement. The ISLR is 14 dB better than that of corresponding previous demonstrations. The results provide, for the first time, 100-ns microwave-photonic delay variations of practical radar signals with a high fidelity that complies with application standards. The method is applicable to LFM waveforms of arbitrary bandwidths and central radio frequencies.

Keywords

acousto-optical modulation; frequency modulation; microwave photonics; acousto-optic modulator; bandwidth 500 MHz; linear frequency modulated waveform; low distortion long variable delay; microwave photonic delay; microwave photonic processing; optical sideband; radar signal; variable frequency offset; Amplitude modulation; Chirp modulation; Delay; Frequency modulation; Microwave theory and techniques; Optical modulation; Photonics; Linear frequency modulated (LFM) waveforms; microwave photonics (MWPs); optical beam forming; variable optical delay;

fLanguage

English

Journal_Title

Photonics Journal, IEEE

Publisher

ieee

ISSN

1943-0655

Type

jour

DOI

10.1109/JPHOT.2012.2191947

Filename

6174423