Title :
Photonic Generation and Detection of W-Band Chirped Millimeter-Wave Pulses for Radar
Author :
Lin, Jim-Wein ; Lu, Chun-Liang ; Chuang, H.-P. ; Kuo, F.-M. ; Shi, Jin-Wei ; Huang, Chen-Bin ; Pan, Ci-Ling
Author_Institution :
Dept. of Phys., Nat. Tsing Hua Univ., Hsinchu, Taiwan
Abstract :
Based on the frequency-to-time mapping approach, we generate frequency-modulated millimeter-wave (MMW) pulses with central frequencies up to the W-band by a shaped optical pulse excitation of an MMW photonic transmitter with an ultrawide band photodiode as its key component. A coherent detection is achieved via a terahertz time-domain spectroscopic setup. Two different kinds of chirped MMW waveforms are generated; one is a linearly chirped sinusoidal pulse and the other is produced by a frequency-stepped modulation. Through appropriate optical spectral design, the frequency-chirped MMW pulses with instantaneous frequencies sweeping from 120 to 60 GHz, and a time-bandwidth product of ~ 25 is experimentally demonstrated.
Keywords :
FM radar; coherence; microwave photonics; millimetre wave radar; optical pulse shaping; photodiodes; radar transmitters; time-domain analysis; ultra wideband radar; MMW photonic transmitter; W-band chirped millimeter-wave pulses; central frequency; chirped MMW waveforms; coherent detection; frequency-chirped MMW pulses; frequency-modulated millimeter-wave pulses; frequency-stepped modulation; frequency-to-time mapping approach; instantaneous frequency; linearly chirped sinusoidal pulse; optical spectral design; photonic detection; photonic generation; radar; shaped optical pulse excitation; terahertz time-domain spectroscopic setup; time-bandwidth product; ultrawide band photodiode; Bandwidth; Chirp; Frequency modulation; Optical filters; Optical transmitters; Photonics; Radar; Millimeter wave (MMW); photonic transmitter (PT); pulse shaping; terahertz (THz);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2012.2205914
