Satellite Payloads Pay Off

Pan, Shilong; Zhu, Dan; Liu, Shifeng; Xu, Kun; Dai, Yitang; Wang, Tianliang; Liu, Jianguo; Zhu, Ning; Xue, Yong; Liu, Naijin

doi:10.1109/mmm.2015.2441619

Cited by 129 publications

(38 citation statements)

References 75 publications

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“…Given that the MIs are usually small, the higher-order optical sidebands are ignored in (1). If the Bessel functions in (1) are approximately expanded using Fig.…”

Section: A Photonic Microwave Mixer Based On a Demzmmentioning

confidence: 99%

See 1 more Smart Citation

Efficient Photonic Microwave Mixer With Compensation of the Chromatic Dispersion-Induced Power Fading

Gao

Wen

Wu³

et al. 2016

J. Lightwave Technol.

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The conversion gain of a photonic microwave mixer is often limited by the large carrier of the modulated optical signal, and may be further deteriorated by the chromatic dispersion-induced power fading after transmission over fiber. To solve this problem, an efficient photonic microwave mixer based on a dual-electrode Mach-Zehnder modulator (DEMZM) is proposed in this paper. The carrier of the modulated optical signal is suppressed by bidirectional use of the modulator in a Sagnac loop, and a 21.9-dB improvement of the conversion gain is achieved in the experiment. In addition, the frequency response of the mixer after transmission over fiber can be tuned by simply adjusting the direct current (DC) bias of the modulator. This feature is applied to compensate the dispersion-induced power fading of the mixing product. In the proof of concept experiment, a vector signal centered at 2.4 GHz is up-converted to 16 GHz and transmitted over 25-km single mode fiber (SMF). After power compensation, the constellation diagram, error vector magnitude (EVM) and receiver sensitivity are significantly improved, and are almost as good as that without fiber transmission.Index Terms-Chromatic dispersion, microwave photonics, microwave mixer, photonic frequency conversion, power fading.

show abstract

“…Given that the MIs are usually small, the higher-order optical sidebands are ignored in (1). If the Bessel functions in (1) are approximately expanded using Fig.…”

Section: A Photonic Microwave Mixer Based On a Demzmmentioning

confidence: 99%

“…Thanks to the merits of large operation bandwidth and electromagnetic immunity compared to conventional mixers, photonic microwave mixer shows great potential in many applications such as radar, electronic warfare, communications, and deep space tracking, telemetry and control (TT&C) systems [1]- [3].…”

Section: Introductionmentioning

confidence: 99%

Efficient Photonic Microwave Mixer With Compensation of the Chromatic Dispersion-Induced Power Fading

Gao

Wen

Wu³

et al. 2016

J. Lightwave Technol.

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show abstract

“…On the other hand, the precision of analog-to-digital converters (ADCs) in the receiver drops rapidly as the input bandwidth and sampling rate increase, which severely restricts the resolution as well as the processing speed. Recently, microwave photonic technologies have been proposed as a promising solution for the generation, detection, and processing of high-frequency RF signals 3–6 , taking advantage of the high-frequency and broadband operation capability provided by optical components. Up to now, a lot of schemes for photonic generation of broadband LFM signals have been demonstrated 7–10 , where a signal bandwidth over 10 GHz can be easily achieved.…”

Section: Introductionmentioning

confidence: 99%

Photonics-based real-time ultra-high-range-resolution radar with broadband signal generation and processing

Zhang

Guo

Pan

2017

Sci Rep

Self Cite

120

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Real-time and high-resolution target detection is highly desirable in modern radar applications. Electronic techniques have encountered grave difficulties in the development of such radars, which strictly rely on a large instantaneous bandwidth. In this article, a photonics-based real-time high-range-resolution radar is proposed with optical generation and processing of broadband linear frequency modulation (LFM) signals. A broadband LFM signal is generated in the transmitter by photonic frequency quadrupling, and the received echo is de-chirped to a low frequency signal by photonic frequency mixing. The system can operate at a high frequency and a large bandwidth while enabling real-time processing by low-speed analog-to-digital conversion and digital signal processing. A conceptual radar is established. Real-time processing of an 8-GHz LFM signal is achieved with a sampling rate of 500 MSa/s. Accurate distance measurement is implemented with a maximum error of 4 mm within a range of ~3.5 meters. Detection of two targets is demonstrated with a range-resolution as high as 1.875 cm. We believe the proposed radar architecture is a reliable solution to overcome the limitations of current radar on operation bandwidth and processing speed, and it is hopefully to be used in future radars for real-time and high-resolution target detection and imaging.

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“…This is mainly caused by the differences in the radiation features of the four antennas in the array, i.e., the second term in Eq. (2). Since the deviation is negligible in general, the proposed wideband-generalized pattern multiplication approach is valid so that the performance evaluation of the optical beamforming-based wideband antenna array can be conducted using only a small anechoic chamber.…”

mentioning

confidence: 99%

“…Optical beamforming, which is one of the most promising solutions to the beam-squint problem in wideband array antenna systems, such as high-resolution radars, electronic warfare systems, and the upcoming 5G mobile communication systems, has been a topic of interest in the last few decades [1][2][3][4][5][6][7] . Thanks to the intrinsic advantage of large instantaneous bandwidth brought by optical technologies, broadband and large-range true time delay (TTD) can be easily implemented in the optical domain [8][9][10][11][12] .…”

mentioning

confidence: 99%

Performance evaluation of optical beamforming-based wideband antenna array (Invited Paper)

Zhang

et al. 2017

Chin. Opt. Lett.

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A wideband-generalized pattern multiplication approach to evaluate the performance of an optical beamforming-based wideband antenna array is proposed and experimentally demonstrated, which enables the far-field measurement of a large wideband array with a small anechoic chamber. Because the optimum reception of a wideband microwave signal is highly related to the time-domain distortions of the beamforming system, a correlation-receiver-based radiation pattern is applied to take the fidelity of the wideband signals into account. A four-element optical beamforming system is built to verify the feasibility of the proposed method. The results achieved by the proposed method agree well with the conventional direct measurements.

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Satellite Payloads Pay Off

Cited by 129 publications

References 75 publications

Efficient Photonic Microwave Mixer With Compensation of the Chromatic Dispersion-Induced Power Fading

Efficient Photonic Microwave Mixer With Compensation of the Chromatic Dispersion-Induced Power Fading

Photonics-based real-time ultra-high-range-resolution radar with broadband signal generation and processing

Performance evaluation of optical beamforming-based wideband antenna array (Invited Paper)

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