P.R. Prucnal

Princeton University, Princeton, New Jersey, United States

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Publications (443)497.45 Total impact

  • Matthew Chang, Noelle Wang, Ben Wu, Paul Prucnal
    Journal of Lightwave Technology 01/2015; DOI:10.1109/JLT.2015.2400399 · 2.86 Impact Factor
  • IEEE Photonics Technology Letters 01/2015; DOI:10.1109/LPT.2015.2405498 · 2.18 Impact Factor
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    ABSTRACT: We propose an on-chip optical architecture to support massive parallel communication among high-performance spiking laser neurons. Designs for a network protocol, computational element, and waveguide medium are described, and novel methods are considered in relation to prior research in optical on-chip networking, neural networking, and computing. Broadcast-and-weight is a new approach for combining neuromorphic processing and optoelectronic physics, a pairing that is found to yield a variety of advantageous features. We discuss properties and design considerations for architectures for scalable wavelength reuse and biologically relevant organizational capabilities, in addition to aspects of practical feasibility. Given recent developments commercial photonic systems integration and neuromorphic computing, we suggest that a novel approach to photonic spike processing represents a promising opportunity in unconventional computing.
    Journal of Lightwave Technology 11/2014; 32(21). DOI:10.1109/JLT.2014.2345652 · 2.86 Impact Factor
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    ABSTRACT: We propose and experimentally demonstrate a wavelength-division multiplexed (WDM) optical stealth transmission system carried by amplified spontaneous emission (ASE) noise. The stealth signal is hidden in both time and frequency domains by using ASE noise as the signal carrier. Each WDM channel uses part of the ASE spectrum, which provides more flexibility to apply stealth transmission in a public network and adds another layer of security to the stealth channel. Multi-channel transmission also increases the overall channel capacity, which is the major limitation of the single stealth channel transmission based on ASE noise. The relations between spectral bandwidth and coherence length of ASE carrier have been theoretically analyzed and experimentally investigated.
    Optics Letters 10/2014; 39(20). DOI:10.1364/OL.39.005925 · 3.39 Impact Factor
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    Ben Wu, B.J. Shastri, P.R. Prucnal
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    ABSTRACT: System performance of optical steganography is theoretically analyzed and experimentally demonstrated. The optical stealth channel is carried by amplified spontaneous emission noise, which hides the stealth data in both the time and frequency domain. Meanwhile, because the stealth channel uses noise as the signal carrier, the relation between signal-to-noise ratio (SNR) and carrier power is fundamentally different from the traditional optical channels carried by modulating lasers. To transmit and hide the stealth signal in the existing public network, the degradation principle of SNR of the stealth channel is studied. Such principle can guide the design of the stealth transmission system and optimize the carrier power of the stealth channel.
    IEEE Photonics Technology Letters 10/2014; 26(19):1920-1923. DOI:10.1109/LPT.2014.2341917 · 2.18 Impact Factor
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    ABSTRACT: We propose and simulate a novel excitable laser employing passively -switching with a graphene saturable absorber for spike processing. Our approach combines the picosecond processing and switching capabilities of both linear and nonlinear optical device technologies to integrate both analog and digital optical processing into a single hardware architecture capable of computation without the need for analog-to-digital conversion. We simulate the laser using the Yamada model-a three-dimensional dynamical system of rate equations-and show behavior that is typical of spiking processing algorithms simulated in small circuits of excitable lasers.
    Optical and Quantum Electronics 10/2014; 46(10):1353-1358. DOI:10.1007/s11082-014-9884-4 · 1.08 Impact Factor
  • John Chang, James Meister, P.R. Prucnal
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    ABSTRACT: A novel highly scalable adaptive photonic beamformer is proposed and experimentally verified. A single-mode-to-multimode combiner allows our system to recycle the same set of wavelengths for each antenna in the array. A “blind” search algorithm called the guided accelerated random search (GARS) algorithm is shown. A maximum cancellation of ∼37 dB is achieved within 50 iterations, while the presence of a signal of interest (SOI) is maintained. Cancellation across the 900 MHz and 2.4 GHz bands are shown to prove the broadband nature of the optical beamformer.
    Journal of Lightwave Technology 10/2014; 32(20):3623-3629. DOI:10.1109/JLT.2014.2309691 · 2.86 Impact Factor
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    ABSTRACT: We propose an equivalent circuit model for photonic spike processing laser neurons with an embedded saturable absorber---a simulation model for photonic excitable lasers (SIMPEL). We show that by mapping the laser neuron rate equations into a circuit model, SPICE analysis can be used as an efficient and accurate engine for numerical calculations, capable of generalization to a variety of different laser neuron types found in literature. The development of this model parallels the Hodgkin--Huxley model of neuron biophysics, a circuit framework which brought efficiency, modularity, and generalizability to the study of neural dynamics. We employ the model to study various signal-processing effects such as excitability with excitatory and inhibitory pulses, binary all-or-nothing response, and bistable dynamics.
    Optics Express 09/2014; 23(6). DOI:10.1364/OE.23.008029 · 3.53 Impact Factor
  • Alexander N. Tait, Paul R. Prucnal
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    ABSTRACT: We discuss a novel application of a photonic circuit for integrated high-performance neuromorphic signal processing. Large fan-in is an especially important capability in distributed systems; however, electronic physics impose tradeoffs between bandwidth performance and fan-in degree. A circuit developed in the field of radio frequency (RF) photonics, wavelength(λ)-fan-in does not exhibit a corresponding tradeoff and can circumvent prior challenges to fan-in in optical distributed processing applications.
    2014 IEEE/ACM International Symposium on Nanoscale Architectures (NANOARCH); 07/2014
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    ABSTRACT: An optical encryption method based on analog noise is proposed and experimentally demonstrated. The transmitted data is encrypted with wideband analog noise. Without decrypting the data instantly at the receiver, the data is damaged by the noise and cannot be recovered by post-processing techniques. A matching condition in both phase and amplitude of the noise needs to be satisfied between the transmitter and the receiver to cancel the noise. The precise requirement of the phase and amplitude matching condition provides a large two-dimensional key space, which can be deployed in the encryption and decryption process at the transmitter and receiver.
    Optics Express 06/2014; 22(12):14568-14574. DOI:10.1364/OE.22.014568 · 3.53 Impact Factor
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    ABSTRACT: We propose an optical encryption technique where the data is encrypted with wideband analog noise. Matching both the phase and amplitude of the noise is required, providing a large key space for the encryption process.
    CLEO: Applications and Technology; 06/2014
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    ABSTRACT: We demonstrate a photonic coincidence detection circuit with a graphene excitable laser. This technology is a potential candidate for applications in novel all-optical devices for information processing and computing.
    CLEO: Science and Innovations; 06/2014
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    ABSTRACT: The marriage of two vibrant fields---photonics and neuromorphic processing---is fundamentally enabled by the strong analogies within the underlying physics between the dynamics of biological neurons and lasers, both of which can be understood within the framework of nonlinear dynamical systems theory. Whereas neuromorphic engineering exploits the biophysics of neuronal computation algorithms to provide a wide range of computing and signal processing applications, photonics offer an alternative approach to neuromorphic systems by exploiting the high speed, high bandwidth, and low crosstalk available to photonic interconnects which potentially grants the capacity for complex, ultrafast categorization and decision-making. Here we highlight some recent progress on this exciting field.
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    ABSTRACT: We present the design and simulation results for a photonic integrated circuit (PIC) that performs in-channel and broadband radio-frequency self-interference cancellation. The PIC removes interference by modeling channel effects and inverting a known interferer prior to combining it with the corrupted signal. We present key simulation results showing that the PIC can cancel extremely wideband interferers by ~20 dB. The PIC performance can be improved by reducing signal attenuation and nonlinearities. We plan to fabricate the PIC on a hybrid silicon-on-insulator III-V evanescent photonic platform.
    2014 23rd Wireless and Optical Communication Conference (WOCC); 05/2014
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    ABSTRACT: Sillion photonic platform development has revolved around point-to-point links for multi-core computing systems. We examine an opportunity for this technology to extend to unconventional architectures that rely heavily on interconnect performance. Broadcast-and-weight is a new approach for joining neuron-inspired processing and optical interconnect physics.
    2014 IEEE Optical Interconnects Conference (OI); 05/2014
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    ABSTRACT: A temporal phase mask encryption method is proposed and experimentally demonstrated to improve the security of the stealth channel in an optical steganography system. The stealth channel is protected in two levels. In the first level, the data is carried by amplified spontaneous emission (ASE) noise, which cannot be detected in either the time domain or spectral domain. In the second level, even if the eavesdropper suspects the existence of the stealth channel, each data bit is covered by a fast changing phase mask. The phase mask code is always combined with the wide band noise from ASE. Without knowing the right phase mask code to recover the stealth data, the eavesdropper can only receive the noise like signal with randomized phase.
    Optics Express 01/2014; 22(1):954-61. DOI:10.1364/OE.22.000954 · 3.53 Impact Factor
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    ABSTRACT: We propose and experimentally demonstrate a method for generating and sharing a secret key using phase fluctuations in fiber optical links. The obtained key can be readily used to support secure communication between the parties. The security of our approach is based on a fundamental asymmetry associated with the optical physical layer: the sophistication of tools needed by an eavesdropping adversary to subvert the key establishment is significantly greater and more costly than the complexity needed by the legitimate parties to implement the scheme. In this sense, the method is similar to the classical asymmetric algorithms (Diffie-Hellman, RSA, etc.).
    Optics Express 10/2013; 21(20):23756-23771. DOI:10.1364/OE.21.023756 · 3.53 Impact Factor
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    ABSTRACT: This letter presents a novel architecture for a wideband photonic beamformer. The system is best suited for an adaptive beamforming application related to a highly non-stationary environment, requiring rapid beam steering. Using optical transversal filters for each antenna element, the array is capable of both spatial beamforming and frequency-domain filtering. With the use of a single-mode fiber to multimode fiber coupling technique, our system is highly scalable, and the same set of laser wavelengths can be used for every antenna in the system. Experimental results are presented to show proof-of-concept and demonstrates proposed adaptive beamformer performance.
    IEEE Microwave and Wireless Components Letters 10/2013; 23(10):563-565. DOI:10.1109/LMWC.2013.2247746 · 2.24 Impact Factor
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    ABSTRACT: We propose an original design for a neuron-inspired photonic computational primitive for a large-scale, ultrafast cognitive computing platform. The laser exhibits excitability and behaves analogously to a leaky integrate-and-fire (LIF) neuron. This model is both fast and scalable, operating up to a billion times faster than a biological equivalent and is realizable in a compact, vertical-cavity surface-emitting laser (VCSEL). We show that-under a certain set of conditions-the rate equations governing a laser with an embedded saturable absorber reduces to the behavior of LIF neurons. We simulate the laser using realistic rate equations governing a VCSEL cavity, and show behavior representative of cortical spiking algorithms simulated in small circuits of excitable lasers. Pairing this technology with ultrafast, neural learning algorithms would open up a new domain of processing.
    IEEE Journal of Selected Topics in Quantum Electronics 09/2013; 19(5):1-12. DOI:10.1109/JSTQE.2013.2257700 · 3.47 Impact Factor
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    ABSTRACT: We demonstrate for the first time an excitable laser using graphene. This technology is a potential candidate for applications in novel all-optical devices for information processing and computing.
    IEEE Photonics Conference (IPC), Seattle, WA, USA; 09/2013

Publication Stats

5k Citations
497.45 Total Impact Points


  • 1986–2014
    • Princeton University
      • Department of Electrical Engineering
      Princeton, New Jersey, United States
  • 2010
    • University of Strathclyde
      • Department of Electronic and Electrical Engineering (EEE)
      Glasgow, Scotland, United Kingdom
  • 2007
    • McGill University
      • Department of Electrical & Computer Engineering
      Montréal, Quebec, Canada
  • 1993–2006
    • Hofstra University
      • Department of Engineering
      Hempstead, New York, United States
  • 2001–2003
    • Comenius University in Bratislava
      • Faculty of Mathematics, Physics and Informatics
      Presburg, Bratislavský, Slovakia
  • 1996
    • Università degli studi di Parma
      Parma, Emilia-Romagna, Italy
  • 1995
    • NEC Corporation
      Edo, Tōkyō, Japan
  • 1986–1987
    • Columbia University
      New York City, New York, United States