Frequency Response Enhancement of Photonic Sampling Based on Cavity-Less Ultra-Short Optical Pulse Source

Li, Zhengkai; Ma, Yangxue; Xu, Ying; He, Yutong; Lyu, Weiqiang; Fu, Zhenwei; Zhang, Zhiyao; Zhang, Shangjian; Li, Heping; Liu, Yong

doi:10.1109/jphot.2022.3162667

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…1 is carried out to verify the feasibility of the proposed scheme. In the optical pulse source, a continuous-wave (CW) light with a wavelength of 1555.6 nm from a DFB-LD is carved into an optical pulse train with a repetition frequency of 5 GHz via MZM1 (AX-0MSS-20-PFAPFA-LV) driven by a single-tone microwave signal with a frequency of 5 GHz and biased at its low point (i.e., below the quadrature point) [12] . Two PMs (PM-5S5-20-PFAPFA-UV), which are driven by the single-tone microwave signals synchronized with that to MZM1 with a frequency of 5 GHz, are used to introduce an approximately linear chirp into each optical pulse.…”

Section: Experiments Resultsmentioning

confidence: 99%

Dynamic range enhancement of photonic sampling based on chirp management in cavity-less optical pulse source

Gao,

Li,

Zhang

et al. 2023

AOPC 2023: AI in Optics and Photonics

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Section: Experiments Resultsmentioning

confidence: 99%

Dynamic range enhancement of photonic sampling based on chirp management in cavity-less optical pulse source

Gao,

Li,

Zhang

et al. 2023

AOPC 2023: AI in Optics and Photonics

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Photonic sampling analog-to-digital conversion based on time and wavelength interleaved ultra-short optical pulse train generated by using monolithic integrated LNOI intensity and phase modulator

Wang

Zhang

et al. 2022

Opt. Express

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High-speed analog-to-digital conversion (ADC) is experimentally demonstrated by employing a time and wavelength interleaved ultra-short optical pulse train to achieve photonic sampling and using wavelength division demultiplexing to realize speed matching between the fast optical front-end and the slow electronic back-end. The sampling optical pulse train is generated from a cavity-less ultra-short optical pulse source involving a packaged device that monolithically integrates an intensity modulator and a phase modulator into a chip based on lithium niobate on insulator (LNOI). In the experiment, the fiber-to-fiber insertion loss of the packaged modulation device is measured to be 6.9 dB. In addition, the half-wave voltages of the Mach-Zehnder modulator and the phase modulator in the LNOI-based modulation device are measured to be 3.6 V and 3.4 V at 5 GHz, respectively. These parameters and the device size are superior to those based on cascaded commercial devices. Through using the packaged modulation device, two ultra-short optical pulse trains centered at 1541.40 nm and 1555.64 nm are generated with time jitters of 19.2 fs and 18.9 fs in the integral offset frequency range of 1 kHz to 10 MHz, respectively, and are perfectly time interleaved into a single pulse train with a repetition rate of 10 GHz and a time jitter of 19.8 fs. Based on the time and wavelength interleaved ultra-short optical pulse train, direct digitization of microwave signals within the frequency range of 1 GHz to 40 GHz is demonstrated by using a two-channel wavelength demultiplexing photonic ADC architecture, where the effective number of bits are 5.85 bits and 3.75 bits for the input signal at 1.1 GHz and 36.3 GHz, respectively.

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Instantaneous bandwidth expansion of photonic sampling analog-to-digital conversion for linear frequency modulation waveforms based on up-sampling and fractional Fourier transform signal processing

Li¹,

Tian²,

Lyu³

et al. 2023

Opt. Express

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An approach to expanding the instantaneous bandwidth of a photonic sampling analog-to-digital converter (ADC) for receiving linear frequency modulation waveforms (LFMWs) is proposed and experimentally demonstrated based on up-sampling and filtering in the fractional Fourier domain. Through twice zero interpolation, the equivalent sampling rate is quadrupled, which also quadruples the nominal instantaneous bandwidth of the photonic sampling ADC. In addition, with the assistance of bandpass filtering in the fraction Fourier domain, the image signals and the harmonic distortions generated in the interpolation process are filtered out. As a result, the effective instantaneous bandwidth of the photonic sampling ADC is doubled. In the experiment, the instantaneous bandwidth of a photonic sampling ADC with a sampling rate of 5 GSa/s for receiving LFMWs is increased from 2.5 GHz to 5 GHz by using the proposed method. Input LFMWs within the frequency range of 24–27 GHz and 30–33 GHz, i.e., with an instantaneous bandwidth of 3 GHz, are digitized without frequency-domain aliasing. Besides, the ability of the proposed method to enhance the ranging accuracy in a broadband radar system is demonstrated. This method reduces the hardware complexity of the photonic sampling ADC for receiving broadband LFMWs in radar systems.

show abstract

Frequency Response Enhancement of Photonic Sampling Based on Cavity-Less Ultra-Short Optical Pulse Source

Cited by 3 publications

References 22 publications

Dynamic range enhancement of photonic sampling based on chirp management in cavity-less optical pulse source

Dynamic range enhancement of photonic sampling based on chirp management in cavity-less optical pulse source

Photonic sampling analog-to-digital conversion based on time and wavelength interleaved ultra-short optical pulse train generated by using monolithic integrated LNOI intensity and phase modulator

Instantaneous bandwidth expansion of photonic sampling analog-to-digital conversion for linear frequency modulation waveforms based on up-sampling and fractional Fourier transform signal processing

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