Signal Reconstruction by Phase Retrieval and Optical Backpropagation in Phase-Diverse Photonic Time-Stretch Systems

Stigwall, Johan; Galt, Sheila

doi:10.1109/jlt.2007.905893

Cited by 29 publications

(19 citation statements)

References 14 publications

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“…As seen from the simulation results, there is an excellent agreement with the output TBP equations given by Eq. (11). We can identify three regions of operation spanning the near-to far-field regimes.…”

Section: Research Articlementioning

confidence: 99%

“…With respect to the field of optics, this predicament arises in fiber optic communication and in real-time optical instruments [1]. Such instruments are used in study of optical rogue waves [2][3][4][5], in ultrafast signal measurement [6][7][8][9][10][11][12], and ultrafast imaging [13][14][15]. Owing to their high measurement rate, real-time instruments produce a fire hose volume of data that overwhelms even the most advanced computers [16].…”

Section: Introductionmentioning

confidence: 99%

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Time–bandwidth engineering

Jalali¹,

Chan²,

Asghari³

2014

Optica

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We describe compression and expansion of the time-bandwidth product of signals and present tools to design optical data compression and expansion systems that solve bottlenecks in the real-time capture and generation of wideband data. Applications of this analog photonic transformation include more efficient ways to sample, digitize, and store optical data. Time-bandwidth engineering is enabled by the recently introduced Stretched Modulation (S M ) Distribution function, a mathematical tool that describes the bandwidth and temporal duration of signals after arbitrary phase and amplitude transformations. We demonstrate design of time-bandwidth engineering systems in both near-field and far-field regimes that employ engineered group delay (GD), and we derive closed-form mathematical equations governing the operation of such systems. These equations identify an important criterion for the maximum curvature of warped GD that must be met to achieve time-bandwidth compression. We also show application of the S M Distribution to benchmark different GD profiles and to the analysis of tolerance to system nonidealities, such as GD ripples.

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Section: Research Articlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Time–bandwidth engineering

Jalali¹,

Chan²,

Asghari³

2014

Optica

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“…Overall, this approach presents itself as an extremely flexible and potentially cost effective measurement system. Numerical studies of time-stretch systems may performed by calculation of the full-complex fields in the time-and frequencydomain without nonlinearities [6]. But in the presence of nonlinearities, the split-step-method [7] and chirp evolution algorithms [8] can be used for numerical simulations.…”

Section: Resonator-based Tsadcmentioning

confidence: 99%

“…In combination with dual-output demodulation algorithms like differential-and asin-algorithm [13], maximum ratio combining method MRC [14], and optical backpropagation method OBPM [6] the original RF-signal can be calculated. In Fig.…”

Section: Dispersion Penalty In R-tsadcmentioning

confidence: 99%

“…The influences due to the wavelength-to-time mismapping, nonlinearities and dispersion penalty can be reduced by postprocessing algorithms, like optical backpropagation method [6] in combination with a correction-function for the time axis. With this signal processing we achieve at least 6 ENOBs over more than one RF-oscillation period for a 10 GHz sine wave with a magnification of M = 15.5.…”

Section: Dispersion Penalty In R-tsadcmentioning

confidence: 99%

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Magnification Dependent Dispersion Penalty Studied With Resonator-Based Time-Stretch Oscilloscope

Weber

Reinheimer

Freymann

2014

J. Lightwave Technol.

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Photonic time‐stretch digitizer and its extension to real‐time spectroscopy and imaging

Fard

Gupta

Jalali

2013

Laser & Photonics Reviews

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Real-time wideband digitizers are the key building block in many systems including oscilloscopes, signal intelligence, electronic warfare, and medical diagnostics systems. Continually extending the bandwidth of digitizers has hence become a central challenge in electronics. Fortunately, it has been shown that photonic pre-processing of wideband signals can boost the performance of electronic digitizers. In this article, the underlying principle of the time-stretch analog-to-digital converter (TSADC) that addresses the demands on resolution, bandwidth, and spectral efficiency is reviewed. In the TSADC, amplified dispersive Fourier transform is used to slow down the analog signal in time and hence to compress its bandwidth. Simultaneous signal amplification during the time-stretch process compensates for parasitic losses leading to high signal-to-noise ratio. This powerful concept transforms the analog signal's time scale such that it matches the slower time scale of the digitizer. A summary of time-stretch technology's extension to highthroughput single-shot spectroscopy, a technique that led to the discovery of optical rouge waves, is also presented. Moreover, its application in high-throughput imaging, which has recently led to identification of rogue cancer cells in blood with record sensitivity, is discussed.

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Signal Reconstruction by Phase Retrieval and Optical Backpropagation in Phase-Diverse Photonic Time-Stretch Systems

Cited by 29 publications

References 14 publications

Time–bandwidth engineering

Time–bandwidth engineering

Magnification Dependent Dispersion Penalty Studied With Resonator-Based Time-Stretch Oscilloscope

Photonic time‐stretch digitizer and its extension to real‐time spectroscopy and imaging

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