Photonic Generation of Linear-Frequency-Modulated Waveforms With Improved Time-Bandwidth Product Based on Polarization Modulation

Zhang, Yamei; Ye, Xingwei; Guo, Qing; Zhang, Fangzheng; Pan, Shilong

doi:10.1109/jlt.2017.2651902

Cited by 61 publications

(23 citation statements)

References 23 publications

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“…In addition to these methods, radar waveforms can also be generated with photonic microwave phase modulation [124], [161], [242], photonic microwave delay-line filtering [243], heterodyning of a fixed wavelength and a wavelength-swept laser [244] and so on. These methods are not discussed in detail here due to their limited phase coherence, system complexity, poor stability or small TBWP at the current stage, but they are likely to contribute to radar applications after certain improvement.…”

Section: B Photonic Radar Waveform Generationmentioning

confidence: 99%

Microwave Photonic Radars

Pan

Zhang

2020

J. Lightwave Technol.

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279

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As the only method for all-weather, all-time and longdistance target detection and recognition, radar has been intensively studied since it was invented, and is considered as an essential sensor for future intelligent society. In the past few decades, great efforts were devoted to improving radar's functionality, precision, and response time, of which the key is to generate, control and process a wideband signal with high speed. Thanks to the broad bandwidth, flat response, low loss transmission, multidimensional multiplexing, ultrafast analog signal processing and electromagnetic interference immunity provided by modern photonics, implementation of the radar in the optical domain can achieve better performance in terms of resolution, coverage, and speed which would be difficult (if not impossible) to implement using traditional, even state-of-the-art electronics. In this tutorial, we overview the distinct features of microwave photonics and some key microwave photonic technologies that are currently known to be attractive for radars. System architectures and their performance that may interest the radar society are emphasized. Emerging technologies in this area and possible future research directions are discussed.

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Section: B Photonic Radar Waveform Generationmentioning

confidence: 99%

Microwave Photonic Radars

Pan

Zhang

2020

J. Lightwave Technol.

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279

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“…Different photonics techniques have been demonstrated to generate linearly chirped waveforms, including direct space-to-time mapping [4], spectral shaping combined with frequency-to-time mapping (FTTM) [5], interference of two ultra-short optical pulses with different dispersions [6] [7], phase modulating two continuous optical wavelengths with an electrical parabolic waveform [8], and so on. However, the time-bandwidth produce (TBWP) of the generated chirped waveforms based on the mentioned schemes still limited.…”

Section: Introductionmentioning

confidence: 99%

Photonics Improvement of the Time-Bandwidth Product for a Linearly Chirped Waveform

Li¹,

Zhao²,

Wang³

et al. 2020

JAMP

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“…This requirement brings great challenges to electrical waveform generation [4,5]. In order to solve this problem, photonic technologies have been introduced to realize flexible waveform generation, especially the linearly frequencymodulated (LFM) signals, due to the advantages of broad instantaneous bandwidth and parallel processing capability brought by photonics [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. One typical method to generate the LFM signal in the optical domain is to employ space-to-time mapping [6] or frequency-to-time mapping [7], which, however, can only produce RF signals with very small time duration (several nanoseconds).…”

Section: Introductionmentioning

confidence: 99%

“…But the time bandwidth products (TBWPs) of the generated waveforms are usually small (around 100). In [13], an electrically split parabolic signal for phase modulation is introduced to improve the TBWP, but the improvement is limited due to the deterioration of the generated signal's spectrum purity when increasing the slicing of the parabolic phase modulation signal. To remedy this, the linearly chirped optical pulses can be generated by changing the electrical drive current of a semiconductor laser [14,15] or the power of an external injection light [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Photonics-based reconfigurable multi-band linearly frequency-modulated signal generation

et al. 2018

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A photonics-based multi-band linearly frequency-modulated (LFM) waveform generator with reconfigurable center frequency, bandwidth and time duration is proposed and demonstrated. By introducing two coherent optical frequency combs (OFCs) with a frequency shift and different free spectral ranges (FSRs) as multi-frequency optical LOs, a set of LFM signals with different center frequencies will be generated if one of the combs is modulated by an intermediate-frequency (IF) LFM signal. The center frequencies of the generated RF-LFM signals can be flexibly tuned by adjusting the frequency shift between the two OFCs. In addition, by introducing a series of proper time delays to the LFM signals and combining them, a frequency-stepped LFM signal can be generated. Furthermore, when the bandwidth of the IF-LFM signal equals the difference of the comb FSRs, and the time duration of IF-LFM signal equals the time delay of the consecutive channels, a LFM signal with both bandwidth and time duration multiplied can be obtained. With N comb lines, the maximum achievable timebandwidth product (TBWP) is N × N times of the applied IF LFM signal. A proof-of-concept experiment is carried out. A set of LFM signals with frequencies ranging from L to Ka bands are generated. By introducing proper time delays, a frequency-stepped LFM signal with frequency steps between 10 GHz and 20 GHz is also produced. In addition, LFM signals with the bandwidth and time duration multiplied by 2 and 5 are realized (4-GHz bandwidth, 2-μs time duration and 10-GHz bandwidth, 5-μs time duration), respectively. Correspondingly, the TBWPs are increased by 4 and 25 times.

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Photonic Generation of Linear-Frequency-Modulated Waveforms With Improved Time-Bandwidth Product Based on Polarization Modulation

Cited by 61 publications

References 23 publications

Microwave Photonic Radars

Microwave Photonic Radars

Photonics Improvement of the Time-Bandwidth Product for a Linearly Chirped Waveform

Photonics-based reconfigurable multi-band linearly frequency-modulated signal generation

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