Single-sideband modulation in photonictime-stretch analogue-to-digital conversion

Fuster, J.M.; Novak, D.; Nirmalathas, Ampalavanapillai; Martí, J.

doi:10.1049/el:20010046

Cited by 47 publications

(20 citation statements)

References 4 publications

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“…The process described by (1) is similar to the dispersion penalty observed in RF fiber-optic links although, for a given fiber length, its magnitude is less due to the stretch process [6]. Recognizing this similarity, optical SSB intensity modulation can be employed for mitigating the dispersion penalty in the TS-ADC system [7]. In the context of the time-bandwidth product, SSB modulation eliminates the tradeoff between the large time aperture and the large bandwidth.…”

Section: Time-bandwidth Product For Optical Ssb Intensity Modulationmentioning

confidence: 99%

“…The length of fiber 1 or, equivalently, the time aperture, could then be freely optimized without sacrificing the RF bandwidth if a broad-band SSB-modulation scheme is achievable. We note that, for the SSB case, a nonlinear phase distortion is present in the output waveform [7]. However, this can be removed in the digital domain using the known dispersion behavior of the fiber.…”

Section: Time-bandwidth Product For Optical Ssb Intensity Modulationmentioning

confidence: 99%

“…Assuming that the SSB modulator shown in Fig. 2 is used, the output optical field could be related to the input optical field by (7) where the modulator is biased at the quadrature point. is the RF angular frequency and is the optical modulation index defined as , in which and are the RF voltage amplitude and the half-wave voltage, respectively.…”

Section: Analysis Of Ssb-modulated Time-stretched Systemmentioning

confidence: 99%

“…The dispersion penalty is qualitatively similar to that occurring in analog fiber links [6]. Therefore, it has been suggested that the penalty can be minimized by employing optical SSB intensity modulation instead of the conventional optical DSB intensity modulation [7]. Optical SSB intensity modulation techniques can be classified into the categories of: 1) filtering and 2) phase discrimination.…”

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confidence: 99%

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Time-bandwidth product of the photonic time-stretched analog-to-digital converter

Han

Jalali

2003

IEEE Trans. Microwave Theory Techn.

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The time-bandwidth product of the photonic time-stretched system is modeled in terms of physical system parameters. Using the time-bandwidth product as figure-of-merit, the performances of optical double-sideband and single-sideband (SSB) intensity modulation are compared, and optical SSB intensity modulation is identified as a potential solution to extend the system's time-bandwidth product. An SSB-modulated time-stretched system is theoretically analyzed and experimentally demonstrated. As an important practical consideration, the analytical model relating the system performance to the phase and amplitude mismatches in the SSB modulator is presented. The results show that the system is tolerant to such unavoidable mismatches. Experiments using commercially available components suggest that the dispersion-induced power penalty can be kept below 2.5 dB over 4-20 GHz bandwidth for any stretch factor. Additional experiments demonstrating 120-GSamples/s real-time digitization of a 20-GHz SSB-modulated signal are also reported.

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Section: Time-bandwidth Product For Optical Ssb Intensity Modulationmentioning

confidence: 99%

Section: Time-bandwidth Product For Optical Ssb Intensity Modulationmentioning

confidence: 99%

Section: Analysis Of Ssb-modulated Time-stretched Systemmentioning

confidence: 99%

mentioning

confidence: 99%

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Time-bandwidth product of the photonic time-stretched analog-to-digital converter

Han

Jalali

2003

IEEE Trans. Microwave Theory Techn.

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“…This occurs due to destructive interference between the frequency mixing terms of the upper and lower modulation sidebands of the optical carrier. Single-sideband modulation has been proposed and demonstrated as a possible solution to extend the analog bandwidth [9]. An alternative technique using phase diversity has also been proposed and demonstrated to eliminate this bandwidth limitation [8,10].…”

Section: Introductionmentioning

confidence: 99%

4-Channel Continuous-Time 77 GSa/s ADC using Photonic Bandwidth Compression

Chou

Sefler

Conway

et al. 2007

Microwave Photonics, 2007 Interntional Topical Meeting On

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A four-channel continuous-time implementation of photonic bandwidth compression technique is reported. In our approach, which is based on the transient time-stretched analogto-digital converter (ADC) technology, continuous high speed RF signals are segmented in the time domain and multiplexed into an array of parallel channels. The segments in each channel are temporally stretched, or equivalently compressed in bandwidth, before digitization.Benefits of our technique include multiplying the effective sample rate and input bandwidth of an ADC. Segments from all 4-channels are concatenated to form the continuous signal using an out-of-band real-time calibration tone to independently correct for gain and timing errors.In this paper, a 4-channel continuous-time architecture is demonstrated that increases the bandwidth and sampling rate of a state-of-the-art real-time 50 GSa/s digitizer by 55%. A 4-channel system is of particular interest because it matches the number of input channels available on commercial oscilloscopes. The results indicate a viable path to a 4-channel continuous-time system that would be capable of enhancing existing digitizers by more than 300% and achieving 150 GSa/s over 50 GHz in real-time.

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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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Single-sideband modulation in photonictime-stretch analogue-to-digital conversion

Cited by 47 publications

References 4 publications

Time-bandwidth product of the photonic time-stretched analog-to-digital converter

Time-bandwidth product of the photonic time-stretched analog-to-digital converter

4-Channel Continuous-Time 77 GSa/s ADC using Photonic Bandwidth Compression

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

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