P.R. Prucnal

Princeton University, Princeton, New Jersey, United States

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Publications (397)425.1 Total impact

  • [Show abstract] [Hide abstract]
    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. · 3.55 Impact Factor
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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. · 3.55 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. · 3.55 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
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    ABSTRACT: We report new approaches for signal generation in Chirped Laser Dispersion Spectroscopy (CLaDS). Two optical arrangements based on electro-optical modulators significantly reduce CLaDS system complexity and enable optimum performance when applied to detection of GHz-wide molecular transitions. Proof-of-principle experiments in the near-infrared spectral range are presented and potential strategies for application in the mid-infrared are discussed.
    Optics Express 06/2013; 21(12):14649-14655. · 3.55 Impact Factor
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    ABSTRACT: We propose and demonstrate a proof-of-concept for a novel multiplexing scheme for high-performance optical interconnects. Our approach is based on waveguide coupling using multilevel detection to increase the system throughput without increasing aggregate bit rate.
    CLEO; 06/2013
  • Yue Tian, Mable P. Fok, Paul R. Prucnal
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    ABSTRACT: We experimentally demonstrate a reconfigurable and timing-jitter insensitive AND/NOT gate based on tunable gain dynamics in a semiconductor optical amplifier and optical thresholding. The measured jitter tolerance is up to ±50 ps or ±25 ps for the AND/NOT gate.
    CLEO: Science and Innovations; 06/2013
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    ABSTRACT: Here, we provide an overview of broadband cosite interference reduction using an optical system to perform incoherent counter-phase modulation and subtraction. The equation governing interference cancellation depth is derived and discussed with respect to two key parameters, attenuation and delay accuracy. Cancellation depth is then examined with respect to signal bandwidth and device parameters to provide a context for predicted cancellation performance. Experimentally recorded interference cancellation data is presented along with predicted performance to show the agreement of theory and data.
    Optical Engineering 05/2013; · 0.88 Impact Factor
  • Maddie Lu, Matt Chang, Yanhua Deng, Paul R Prucnal
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    ABSTRACT: The performance of three optics-based interference cancellation systems are compared and contrasted with each other, and with traditional electronic techniques for interference cancellation. The comparison is based on a set of common performance metrics that we have developed for this purpose. It is shown that thorough evaluation of our optical approaches takes into account the traditional notions of depth of cancellation and dynamic range, along with notions of link loss and uniformity of cancellation. Our evaluation shows that our use of optical components affords performance that surpasses traditional electronic approaches, and that the optimal choice for an optical interference canceller requires taking into account the performance metrics discussed in this paper.
    Applied Optics 04/2013; 52(11):2484-93. · 1.69 Impact Factor
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    ABSTRACT: We propose a novel all-optical integrated thresholder called the dual resonator enhanced asymmetric Mach–Zehnder interferometer (DREAM). Unlike prior integrated photonic devices, the DREAM exhibits properties of stable binary decision making, outputting a constant “one” power value for signals above a certain power level and “zero” for signals of lower powers. This thresholding shape arises from the interference of complementary nonlinear effects of two microring resonators (MRR), one in each arm of a Mach–Zehnder interferometer (MZI). The proposed de- vice performs several orders of magnitude better in size, decision latency, energy efficiency, and stability compared to fiber-based methods of optical thresholding. It is best suited for application in densely integrated systems where rapid conversion between analog and digital signal domains is ubiquitous, such as hybrid analog-digital and neuromorphic processing architectures. We derive analytical steady-state solutions to the nonlinear MRR, which enable design simulation, optimization, and au- tomation of a continuous signal thresholder about three orders of magnitude faster than with numerical simulation. Additional numerical simulations indicate the possibility of a 50 GHz pulse thresholder with a 380 pJ switching threshold in a silicon-on-insulator (SOI) platform. The proposed circuit design techniques are potentially applicable to a wide range of materials, waveguide platforms, and resonator types, but for concreteness, we limit the focus of this paper to MRRs in SOI.
    Journal of Lightwave Technology 04/2013; 31(8):1263-1272. · 2.56 Impact Factor
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    ABSTRACT: In this paper we present a fully tunable and reconfigurable single-laser multi-tap microwave photonic FIR filter that utilizes a special SM-to-MM combiner to sum the taps. The filter requires only a single laser source for all the taps and a passive component, a SM-to-MM combiner, for incoherent summing of signal. The SM-to-MM combiner does not produce optical interference during signal merging and is phase-insensitive. We experimentally demonstrate an eight-tap filter with both positive and negative programmable coefficients with excellent correspondence between predicted and measured values. The magnitude response shows a clean and accurate function across the entire bandwidth, and proves successful operation of the FIR filter using a SM-to-MM combiner.
    Optics Express 03/2013; 21(5):5585-5593. · 3.55 Impact Factor
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    ABSTRACT: We demonstrate a hybrid optical/digital phase-sensitive boosting (PSB) technique for long-haul wavelength division multiplexing (WDM) transmission systems. The approach uses four-wave mixing (FWM) to generate a phase-conjugated idler alongside the original signal. At the receiver, the signal and idler are jointly detected, and the phases of the idler symbols are conjugated and summed with the signal symbols to suppress noise and nonlinear phase distortion. The proposed hybrid PSB scheme is independent of modulation format and does not require an optical phase-locked loop to achieve phase matching required by conventional phase-sensitive amplifiers. Our simulation and experimental results of 112-Gb/s dual-polarization quadrature phase-shift-keying (DP-QPSK) transmission confirmed the principle of the PSB scheme, attaining a Q-factor improvement of 2.4 dB over conventional single-channel transmission after 4,800 km of dispersion-managed fiber (DMF) link at the expense of 50% reduction in spectral efficiency and extending the system reach by 60% to 7,680 km.
    Optics Express 02/2013; 21(4):5099-5106. · 3.55 Impact Factor
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    ABSTRACT: Biological neurons perform information processing using a model called pulse processing, which is both computationally efficient and scalable, adopting the best features of both analog and digital computing. Implementing pulse processing with photonics can result in bandwidths that are billions of times faster than biological neurons and substantially faster than electronics. Neurons have the ability to learn and adapt their processing based on experience through a change in the strength of synaptic connections in response to spiking activity. This mechanism is called spike-timing-dependent plasticity (STDP). Functionally, STDP constitutes a mechanism in which strengths of connections between neurons are based on the timing and order between presynaptic spikes and postsynaptic spikes, essentially forming a pulse lead/lag timing detector that is useful in feedback control and adaptation. Here we report for the first time the demonstration of optical STDP that is useful in pulse lead/lag timing detection and apply it to automatic gain control of a photonic pulse processor.
    Optics Letters 02/2013; 38(4):419-21. · 3.39 Impact Factor
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    ABSTRACT: We propose and experimentally demonstrate an optical steganography method in which a data signal is transmitted using amplified spontaneous emission (ASE) noise as a carrier. The ASE serving as a carrier for the private signal has an identical frequency spectrum to the existing noise generated by the Erbium doped fiber amplifiers (EDFAs) in the transmission system. The system also carries a conventional data channel that is not private. The so-called "stealth" or private channel is well-hidden within the noise of the system. Phase modulation is used for both the stealth channel and the public channel. Using homodyne detection, the short coherence length of the ASE ensures that the stealth signal can only be recovered if the receiver closely matches the delay-length difference, which is deliberately changed in a dynamic fashion that is only known to the transmitter and its intended receiver.
    Optics Express 01/2013; 21(2):2065-71. · 3.55 Impact Factor
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    ABSTRACT: We report the experimental demonstration of a room temperature, high responsivity, short wavelength II-VI Zn0.51Cd0.49Se/Zn0.29Cd0.26Mg0.45Se based quantum well infrared photodetector operating between 3 and 5 μm. Spectral response was observed up to room temperature with a cut off wavelength of 5 μm at 280 K. Measurements with a calibrated blackbody source yielded a peak responsivity of over 30 A/W at 280 K and an applied bias of −3 V. The dark current limited peak detectivity at 80 K and 280 K were measured to be 2 × 109 cm √Hz/W and 4 × 107 cm √Hz/W, respectively. These results are consistent with theoretical calculations that predict a maximum detectivity of the order of 107 cm √Hz/W at room temperature for typical carrier lifetimes and optimized doping levels.
    Applied Physics Letters 01/2013; 102:161107. · 3.79 Impact Factor
  • J. Chang, P.R. Prucnal
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    ABSTRACT: A novel analog optical technique for multipath interference cancellation of broadband signals is proposed. Multiple optical compensation branches are utilized to replicate wireless multipath channel effects. The duplicated signal is subtracted from the total received signal to recover the signal of interest while suppressing interference. The proposed architecture achieved 40 dB of cancellation over 200 MHz and 50 dB over 10 MHz. The depth and broadband nature of the cancellation demonstrates the precision of optical components and the validity of our interference cancellation scheme.
    IEEE Microwave and Wireless Components Letters 01/2013; 23(7):377-379. · 1.78 Impact Factor
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    ABSTRACT: Phase mask encryption is proposed to improve the transmission privacy of an optical steganography system. The stealth signal carried by amplified spontaneous emission noise is encrypted by a fast changing code.
    Photonics Conference (IPC), 2013 IEEE; 01/2013
  • M.P. Fok, P.R. Prucnal
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    ABSTRACT: We propose and experimentally demonstrate a bio-inspired intelligent hybrid photonic processing devices for optical interconnection networks which is capable of performing complex processing of broadband signal as well as learning and adapting to changes.
    Optical Interconnects Conference, 2013 IEEE; 01/2013
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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 01/2013; 19(5):1-12. · 4.08 Impact Factor
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    ABSTRACT: We propose a novel excitable laser employing passively Q-switching with a graphene saturable absorber for spike processing networks. 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 ultrafast computation without the need for analog-to-digital conversion.
    Numerical Simulation of Optoelectronic Devices (NUSOD), 2013 13th International Conference on; 01/2013

Publication Stats

2k Citations
425.10 Total Impact Points


  • 1988–2013
    • 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
    • University of California, San Diego
      San Diego, California, United States
    • McGill University
      • Department of Electrical & Computer Engineering
      Montréal, Quebec, Canada
  • 1993–2006
    • Hofstra University
      • Department of Engineering
      Hempstead, New York, United States
  • 1998
    • New Mexico Highlands University
      Las Vegas, Nevada, United States
  • 1996
    • Università degli studi di Parma
      Parma, Emilia-Romagna, Italy
  • 1995
    • NEC Corporation
      Edo, Tōkyō, Japan
  • 1987
    • Columbia University
      New York City, New York, United States