Athermal Optical Demodulator for ITU 50-GHz-Grid OC-768 DPSK Signals Over C+L Band

  • Chiayu A.
  • Chien V.
  • Gnauck A.
  • Hsieh J.
  • Liu X.
  • Wei X.

We report an athermal optical-delay-interferometer capable of demodulating any OC-768 DPSK signal on the ITU 50-GHz-grid over the C+L band. Its decoding penalty, compared to a temperature- controlled 1-bit delay-interferometer, is <0.5 dB over 0~70°C for NRZ-DPSK and 67%RZ-DPSK signals.

Hybrid free-space and planar lightwave circuit wavelength-selective 1×3 switch with integrated drop-side demultiplexer

  • Cappuzzo M.
  • Chen E.
  • Doerr C.
  • Gomez L.
  • Marom D.
  • Wong-Foy A.

We propose and demonstrate a 100GHz-spaced, wavelength-selective switch with a single input port, three multiplexed output ports for mesh networking functionality, and an integrated demultiplexer for locally dropping channels for detection.

Quantum Noise Properties of Parametric Process I: General Results

  • Mckinstrie C.
  • Radic S.
  • Raymer M.
  • Yu M.

In this report the quantum noise properties of phase-insensitive and phase-sensitive parametric processes are studied. Formulas for the field-quadrature and photon-number means and variances are derived, for processes that involve arbitrary numbers of modes. These quantities determine the signal-to-noise ratios associated with the direct and homodyne detection of optical signals.

Modulation and Detection Techniques for Optically-Routed Networks

  • Essiambre R.
  • Winzer P.

We discuss properties of optical modulation formats and digital signal pre- and post-processing techniques that are important for transparent optical networking.

Bound-to-bound mid-infrared intersubband absorption in carbon- doped GaAs/AlGaAs quantum wells

  • Gmachl C.
  • Malis O.
  • Pfeiffer L.
  • Sergent A.
  • West K.

Abstract. Bound-to-bound intersubband absorption in the valence band of modulation -doped GaAs quantum wells with digitally alloyed AlGaAs barriers was studied in the mid-infrared wavelength range. A novel high-purity solid carbon source was used for the p-type doping. Strong, narrow absorption peaks due to heavy- to-heavy hole transitions are observed ...

Signal analysis tools applied to the temporal characterization of ultrashort optical pulses

  • Dorrer C.

Concepts for the measurement of the temporal electric field of optical pulses are reviewed. Examples of characterization techniques based on the concepts of spectrography, interferometry and tomography are presented.

Organic Field-Effect Transistors Comprising Semiconductor Layers Laminated on Thermoplastic Gate Dielectric Layers

  • Katz H.
  • Kloc C.
  • Lovinger A.
  • Maliakal A.
  • Ofuji M.
  • Siegrist T.

Organic field-effect transistors (FETs) may be cost-effective alternatives to amorphous-silicon transistors in certain applications. Vacuum-deposited polycrystalline organic semiconductor films exhibit equivalent mobilities to amorphous silicon, and typically outperform polymeric semiconductors. While polymers can be deposited by inkjet printing or thermal transfer, efficient additive deposition of vacuum-deposited and insoluble organics has ...

Optical Amplification and Signal Processing in Highly Nonlinear Optical Fiber

  • Mckinstrie C.
  • Radic S.

Fundamentals of parametric processing in highly nonlinear optical fiber are reviewed. Experimental procedures necessary for construction of one- and two-pump parametric amplifier architectures are described. Pump phase broadening, dispersion fluctuation and birefringence form basic impairment mechanisms in fiber parametric devices and are analyzed in two-pump parametric devices. Parametric signal processing ...

Computing Large Signal Distortions and Bit-Error-Ratios in DPSK Transmission Systems

  • Kath W.
  • Mckinstrie C.
  • Moore R.
  • Spiller E.

We demonstrate the application of importance sampling (IS) to the simulation of a soliton-based differential phase-shift keyed (DPSK) optical transmission system. We use an approximation to the pulse evolution given by perturbation theory and optimized with calculus of variations to guide full numerical Monte-Carlo simulations employing IS. The method not ...

Beyond Rapid Provisioning: Driving Value-Added Services On Control Plane Foundations

  • Acharya S.
  • Liebenow J.
  • Risbood P.
  • Rothkegel W.
  • Srivastava A.

Optical control planes came to fore during the Internet boom of the late nineties as the network operations solution of choice for the emerging mesh architectures. However, in spite of the numerous advantages, their deployments in service provider networks have been below expectations. While the telecom downturn of the last ...


  • Duelk M.
  • Gutierrez-Castrejon R.

We present an advanced and comprehensive semiconductor optical ampli&#64257;er model to analyse the propagation and ampli&#64257;cation of 10 to 160 Gb/s ultra–short pulse sequences.Through appropriate transformation,the partial di&#64256;erential propagation- rate equation problem is numerically solved in a two–dimesional grid of &#64257;ne resolution.The corresponding simulator, entirely programmed in LabVIEW, is compared ...

Corrections to "Stability in Recurrence Systems whose Recurrence Relations Possess a Certain Positivity Property"

  • Nuzman C.

Counterexamples demonstrate that certain theorems about global properties of recurrence relations with positive derivatives do not hold. The theorems appeared in [G. C. Taylor, "Stability in Recurrence Systems Whose Recurrence Relations Posess a Certain Positivity Property",SIAM J. Applied Mathematics, Vol. 35, 1978].

Refined Large Deviation Asymptotics for the Classical Occupancy Problem

  • Dupuis P.
  • Whiting P.
  • Zhang J.

In this paper refined large deviation asymptotics are derived for the classical occupancy problem. The asymptotics are established for a sequential filling experiment and an occupancy experiment. In the first case the random variable of interest is the number of balls required to fill a given fraction of the urns, ...

Software-Hardware Partitioning in Scheduled Medium-Access Protocols

  • Carroll M.
  • Hadzic I.
  • Suvakovic D.

A scheduled medium-access protocol (SMAP) is a shared medium access control protocol that avoids collisions by scheduling the transmissions of stations in the network. Typically there is a central entity in the sytem (the scheduler) that determines and communicates the schedule to all other stations. Broadband access networks such as ...

Moment equations for optical pulses in systems with filters

  • Kozlov M.
  • Mckinstrie C.
  • Xie C.

In previous reports (ITD-02-42927K, ITD-02-43137N and ITD-02- 43768Z) the moment method was used to derive evolution equations for the energy, width and chirp of an optical pulse in a dispersive and dissipative (filtered) system. In this report the moment equations are reviewed, and used to study the effects of filtering ...

Self-mode-locked semiconductor lasers at 1.56 um

  • Bernasconi P.
  • Sauer N.
  • Yang W.
  • Zhang L.

We report self-mode-locked semiconductor lasers at 1.56 um operating at 40 GHz repetition rate. These devices are based on enhanced Kerr lens mode-locking by vertically combining the active section with a passive waveguiding layer. The FWHM width of the pulse spectrum is over 8 nm and the time domain pulse ...

Selective randomized load balancing and mesh networks with changing demands

  • Oswald P.
  • Shepherd F.
  • Winzer P.
  • Zirngibl M.

We consider the problem of building cost-effective network architectures, which are robust to dynamic changes in demand patterns, and are thus highly suitable for emerging services such as virtual private networks (VPNs) or distributed storage and computing. Applying previous research on randomized load balancing and VPN-Tree network design, we explore ...

Chirped RZ-DPSK Based on Single Mach-Zehnder Modulator and Its Nonlinear Transmission Performance

  • Kao Y.
  • Liu X.

We present a detailed analysis of positively and negatively chirped return-to-zero differential phase-shift keyed (CRZ- DPSK) signals that are generated using a single Mach-Zehnder modulator at the transmitter. Supporting CRZ-DPSK experiments at 10-Gb/s showed a nominal receiver sensitivity of –42 dBm at BER=10-9. We find that CRZ-DPSK signals with a ...

Acoustic phonon scattering in a low density, high mobility AlGaN/GaN field effect transistor

  • Ahmadian Y.
  • Baldwin K.
  • Henriksen E.
  • Manfra M.
  • Sergent A.
  • Stormer H.
  • Syed S.

We report on the temperature dependence of the mobility of the two-dimensional electron gas in a variable density AlGaN/GaN field effect transistor, with carrier densities ranging from 0.4x1012cm-2 to 3.0x1012cm-2 and a peak mobility of 80,000cm2/Vs. Between 20K and 50K we observe a linear dependence (mobility)^- 1=alpha*T indicating that acoustic ...

A Rate Control Algorithm for Uplink High-Speed Packet Data Transmission in UMTS

  • Lee J.
  • Nagaraj S.
  • Rao A.

High speed data services are becoming increasingly important in the uplink of wireless communication systems in order to support applications such as FTP, E-Mail, and gaming. In Release 6 of the Universal Mobile Telecommunications System (UMTS) standard, an Enhanced Dedicated Channel (E-DCH) has been introduced to provide high-speed packet data ...