Photonic Bandwidth Compression Front End for Digital Oscilloscopes

Chou, Jason; Conway, Josh; Sefler, George A.; Valley, George C.; Jalali, Bahram

doi:10.1109/jlt.2009.2030519

Cited by 35 publications

(19 citation statements)

References 10 publications

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“…In Fig. 3 the curve is the signal after coherent detection algorithm described by equation (8). The RF signal is a 50GHz cosine signal and the modulation index is =5% m .…”

Section: Simulation and Discussionmentioning

confidence: 99%

Photonic time-stretch analog-to-digital converter employing phase-modulation and envelope removing

et al. 2013

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Time-stretch technique has been researched for a long time and many implementations with different performance have been proposed. In this paper, we utilize phase modulation and optical coherent detection (PM-CD) to implement photonic time-stretch analog-to-digital converter. In this implementation scheme, only one optical source is used to ensure the coherence of the modulated signal and the reference signal. Besides, envelope removing technique is also employed to remove the Gaussian envelope contained in the stretched radio frequency (RF) signal. As a proof of its feasibility, this paper presents a brief analysis of the time-stretch technique and the implementation of the PM-CD system we proposed. A comprehensive mathematical model for the PM-CD combining with envelope removing technique is developed and a numerical simulation is also presented. Simulation results show this technique can not only slow down the high frequency RF signal but also recover the stretched RF signal with little distortion. The most important point is the phase error in PM-CD, the nonlinearity of the photodetector (PD) and the pulse-to-pulse variations can be eliminated at the same time. This technique is an improvement compared to the previously proposed PM-CD time-stretch analog-to-digital converter.

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“…In Fig. 3 the curve is the signal after coherent detection algorithm described by equation (8). The RF signal is a 50GHz cosine signal and the modulation index is =5% m .…”

Section: Simulation and Discussionmentioning

confidence: 99%

Photonic time-stretch analog-to-digital converter employing phase-modulation and envelope removing

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Two particularly useful architectures involve time-stretch sampling [18], [19] and nonuniform sampling [20]. In time-stretch sampling, the optical pulse is chirped and stretched prior to encoding to form a linear optical frequency-(or wavelength-) to-time mapping within a single sampling pulse.…”

Section: Photonic Downconversion and Microwave-to-digital Subsystemsmentioning

confidence: 99%

Photonics for RF Front Ends

Clark

Waterhouse

2011

IEEE Microwave

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“…With several decades of research in photonic analog-to-digital converters (ADCs) [1,2], last few years have seen a renewed interest in this technology [3][4][5][6][7], considered as capable of delivering orders-of-magnitude improvement in accurate digitization of high-speed RF signals. The progress in electronic ADC performance is facing two major challenges: aperture jitter of the sampling clock and comparator ambiguity [8].…”

Section: Introductionmentioning

confidence: 99%

“…With the photonic time-stretch approach [17], the bandwidth of the time-division multiplexed channels is reduced, enabling sampling rates as high as 10 TSa/s [18]. Some recent photonic ADC demonstrations include sampling of a 733 MHz RF tone with 9.8 effective number of bits (ENOB) [19], a 35 GHz tone with 2.5 ENOB [3], 4 GHz with 7.2 ENOB and 10 GHz with 6.65 ENOB [4], 6.5 GHz with 6.65 ENOB and 10 GHz with 6.15 ENOB [5], 40 GHz with 6.0 ENOB [6], and 41 GHz with 7.0 ENOB [7]. What makes these developments especially exciting is that with the recent progress made in silicon photonic and electronic-photonic integration technologies [20][21][22], it becomes feasible to transfer the photonic ADC systems from an optical table to a single silicon chip.…”

Section: Introductionmentioning

confidence: 99%

Progress in Photonic Analog-to-Digital Conversion

Kärtner

Khilo²

2013

Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2013

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Recent progress in using photonics for highly-accurate analog-to-digital conversion of wideband RF signals is reviewed, its capabilities and limitations are discussed. A down-converting electronic-photonic ADC digitizing a 41GHz tone with 16fs equivalent jitter is presented. IntroductionWith several decades of research in photonic analog-to-digital converters (ADCs) [1,2], last few years have seen a renewed interest in this technology [3][4][5][6][7], considered as capable of delivering orders-of-magnitude improvement in accurate digitization of high-speed RF signals. The progress in electronic ADC performance is facing two major challenges: aperture jitter of the sampling clock and comparator ambiguity [8]. In the photonic approach, the problem of aperture jitter is addressed by sampling the RF signal optically with ultra-stable pulse trains available from mode-locked lasers; the timing jitter of such pulse trains can approach few attoseconds [9][10][11][12], which is over four orders of magnitude less than the jitter in state-of-the-art electronic ADCs [8]. The second challengecomparator ambiguity -is completely eliminated by separating the fast RF signal into multiple slower channels, using a time- . What makes these developments especially exciting is that with the recent progress made in silicon photonic and electronic-photonic integration technologies [20][21][22], it becomes feasible to transfer the photonic ADC systems from an optical table to a single silicon chip. This means that the road is now open to the arrival of an accurate, high-speed, integrated electronic-photonic ADC as a practical consumer product.In this presentation, we will overview recent progress made in photonic ADCs, explain the principles and main schemes for photonic analog-to-digital (A/D) conversion, present some of our results on the way to build a monolithic photonic ADC, and speculate about the future of photonic ADC technology.

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Photonic Bandwidth Compression Front End for Digital Oscilloscopes

Cited by 35 publications

References 10 publications

Photonic time-stretch analog-to-digital converter employing phase-modulation and envelope removing

Photonic time-stretch analog-to-digital converter employing phase-modulation and envelope removing

Photonics for RF Front Ends

Progress in Photonic Analog-to-Digital Conversion

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