Broadband photonic ADC for microwave photonics-based radar receiver

Jiaqian Yang; Shangyuan Li; Xuedi Xiao; Dexin Wu; Xiaoxiao Xue; Xiaoping Zheng

doi:10.3788/COL201816.060605

Journals >Chinese Optics Letters >Volume 16 >Issue 6 >Page 060605 > Article

Chinese Optics Letters
Vol. 16, Issue 6, 060605 (2018)

Broadband photonic ADC for microwave photonics-based radar receiver

Jiaqian Yang, Shangyuan Li, Xuedi Xiao, Dexin Wu, Xiaoxiao Xue, and Xiaoping Zheng^*

Author Affiliations

Tsinghua National Laboratory for Information Science and Technology, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China

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DOI: 10.3788/COL201816.060605 Cite this Article Set citation alerts

Jiaqian Yang, Shangyuan Li, Xuedi Xiao, Dexin Wu, Xiaoxiao Xue, Xiaoping Zheng. Broadband photonic ADC for microwave photonics-based radar receiver[J]. Chinese Optics Letters, 2018, 16(6): 060605 Copy Citation Text

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Abstract

A broadband photonic analog-to-digital converter (ADC) for X-band radar applications is proposed and experimentally demonstrated. An X-band signal with arbitrary waveform and a bandwidth up to 2 GHz can be synchronously sampled and processed due to the optical sampling structure. In the experiment, the chirp signal centered at 9 GHz with a bandwidth of 1.6 GHz is sampled and down-converted with a signal-to-noise ratio of 7.20 dB and an improved noise figure. Adopting the photonic ADC in the radar receiver and the above signal as the transmitted radar signal, an X-band inverse synthetic aperture radar system is set up, and the range and cross-range resolutions of 9.4 and 8.3 cm are obtained, respectively.

V_{in} (t) = V_{s} \cos [2 π (f_{0} t + \frac{1}{2} \frac{B}{T} t^{2})],

(1)

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E_{MZM} (t) = E_{in} (t) \cos {\frac{π}{2 V_{π}} [V_{in} (t) + V_{b}]} e^{j φ_{M}},

(2)

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I (t) = \frac{1}{2} ℜ {| E_{in} |}^{2} {\begin{matrix} 1 - 2 J_{1} (2 m) \cos 2 π (f_{0} t + \frac{1}{2} \frac{B}{T} t^{2}) + \\ 2 J_{3} (2 m) \cos 6 π (f_{0} t + \frac{1}{2} \frac{B}{T} t^{2}) + \dots \end{matrix}},

(3)

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SNR = - 10 \log [δ_{A}^{2} + {(2 π f σ_{j})}^{2} + δ_{EDFA}^{2} + δ_{b}^{2} + \frac{1}{3 \times 2^{2 N - 1}}] .

(4)

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Jiaqian Yang, Shangyuan Li, Xuedi Xiao, Dexin Wu, Xiaoxiao Xue, Xiaoping Zheng. Broadband photonic ADC for microwave photonics-based radar receiver[J]. Chinese Optics Letters, 2018, 16(6): 060605

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