All-optical regeneration on a silicon chip

School of Applied and Engineering Physics, Cornell University, Итак, New York, United States
Optics Express (Impact Factor: 3.49). 07/2007; 15(12):7802-9. DOI: 10.1364/OE.15.007802
Source: PubMed


We demonstrate optical 2R regeneration in an integrated silicon device consisting of an 8-mm-long nanowaveguide followed by a ring-resonator bandpass filter. The regeneration process is based on nonlinear spectral broadening in the waveguide and subsequent spectral filtering through the ring resonator. We measure the nonlinear power transfer function for the device and find an operating peak power of 6 W. Measurements indicate that the output pulse width is determined only by the bandwidth of the bandpass filter. Numerical modeling of the nonlinear process including free-carrier effects shows that this device can be used for all-optical regeneration at telecommunication data rates.

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    • "The above motivations led to considerable research efforts on nonlinear silicon photonics in recent years [26] [27] [28] [29] [30]. Nonlinear effects such as SRS [67] [68] [69] [70] [71] [72] [73] [74] [75] [76] [77] [78] [79] [80] [81] [82] [83], self-and cross-phase modulation (SPM and XPM) [84] [85] [86] [87] [88] [89] [90] [91], fourwave mixing (FWM) [92] [93] [94] [95] [96] [97] [98] [99] [100] [101] [102], and supercontinuum generation [60, 61, 103–108] are actively investigated. The main focus is on the near-IR wavelength range, around the telecom window. "
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    ABSTRACT: Group IV photonics hold great potential for nonlinear applications in the near- and mid-infrared (IR) wavelength ranges, exhibiting strong nonlinearities in bulk materials, high index contrast, CMOS compatibility, and cost-effectiveness. In this paper, we review our recent numerical work on various types of silicon and germanium waveguides for octave-spanning ultrafast nonlinear applications. We discuss the material properties of silicon, silicon nitride, silicon nano-crystals, silica, germanium, and chalcogenide glasses including arsenic sulfide and arsenic selenide to use them for waveguide core, cladding and slot layer. The waveguides are analyzed and improved for four spectrum ranges from visible, near-IR to mid-IR, with material dispersion given by Sellmeier equations and wavelength-dependent nonlinear Kerr index taken into account. Broadband dispersion engineering is emphasized as a critical approach to achieving on-chip octavespanning nonlinear functions. These include octave-wide supercontinuum generation, ultrashort pulse compression to sub-cycle level, and mode-locked Kerr frequency comb generation based on few-cycle cavity solitons, which are potentially useful for next-generation optical communications, signal processing, imaging and sensing applications.
    Nanophotonics 08/2014; 3(4-5). DOI:10.1515/nanoph-2013-0020 · 5.69 Impact Factor
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    • "As optical interconnects find application at progressively shorter scales in computing systems, reliable, integrable, and efficient all-optical processing devices will become especially critical to support speed and energy performance scaling. Integrated devices that can reduce noise corruptions to a binary signal have been demonstrated [6]; in contrast, a thresholder must produce an approximately binary output from on a continuous valued analog input signal, thus making a decision. Ultrafast all-optical thresholders have previously been constructed using fiber based interferometers [7], [8]; however, the long interaction lengths required for switching in nonlinear fibers (meters to kilometers) and transfer function ripple in the abovethreshold one-level region limit these techniques to specialized applications. "
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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. DOI:10.1109/JLT.2013.2246544 · 2.97 Impact Factor
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    • "For ultra-fast telecommunication systems, all-optical data processing functions such as signal regeneration, wavelength conversion, and dynamical switching are highly desirable [1] [2] [3] [4] [5]. To this avail, most research efforts are devoted to the development of complex technical platforms. "
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    ABSTRACT: Micro- and nanofibers constitute an attractive platform for testing nonlinear devices with millimeter size in a simple and flexible fashion, with potential applications in ultra-fast all-optical communications. In this article, we present challenges that must be addressed and targets that can be reached using such a platform. We describe a tunable laser source capable of delivering pulses with a kilowatt peak power and a sub-0.1-nm linewidth that is specially designed for the study of resonant devices such as the nonlinear loop resonator. Experimental and simulation results are presented for silica microfiber based nonlinear devices. The prospect of developing hybrid devices combining highly nonlinear glasses and silica fibers is supported by numerical simulations of the coupling between two nanofibers of largely different optical indices.
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