Resonant Optical Nonlinearities from Intersubband Transitions in GaN/AlN Quantum Wells

  • Chen G.
  • Chu S.
  • Gmachl C.
  • Mitrofanov O.
  • Ng H.
  • Rapaport R.

We measured the resonant nonlinear optical response of the intersubband transitions in GaN/AlGaN multiple quantum well structures. The measured value for the nonlinear susceptibility is found to be much smaller than previous theoretical predictions. This is attributed to a large electron dephasing due to material imperfections. We show that at ...

Performance of an Optical Switch based on 3D MEMS crossconnect

  • Kim J.
  • Kozhevnikov M.
  • Lichtenwalner C.
  • Nuzman C.
  • Olkhovets A.
  • Phanaphat P.
  • Shin D.

We demonstrate 12-14 ms average time to establish multiple connections. Each connection supports dynamic gain equalization function. We have demonstrated a shared mesh restoration on a small optically-transparent network, with SONET-like restoration times.

Conductivity of Paired Composite Fermions

  • Bonesteel N.
  • Foster K.
  • Simon S.

We develop a phenomenological description of the $nu=5/2$ quantum Hall state in which the Halperin-Lee-Read theory of the half-filled Landau level is combined with a $p$-wave pairing interaction between composite fermions (CFs). The electromagnetic response functions for the resulting mean-field superconducting state of the CFs are calculated and used in ...

1100 x 1100-port MEMS-based Optical Crossconnect with 4 dB Maximum Loss

  • Aksyuk V.
  • Arney S.
  • Basavanhally N.
  • Bolle C.
  • Chan H.
  • Frahm R.
  • Gasparyan A.
  • Gates Ii J.
  • Haueis M.
  • Kim J.
  • Kolodner P.
  • Kraus J.
  • Kumar B.
  • Lichtenwalner C.
  • Lieuwen D.
  • Lifton V.
  • Neilson D.
  • Nuzman C.
  • Papazian A.
  • Pardo F.
  • Ramsey D.
  • Ryf R.
  • Shea H.
  • Simon M.
  • Weiss A.

We present a Micro-Electromechanical Systems (MEMS) based beam steering optical crossconnect switch with port count exceeding 1100 ports, featuring mean fiber-to-fiber insertion loss of 2.1 dB, and a maximum insertion loss of 4.0 dB across all possible connections. The challenge of efficient measurement and optimization of all possible connections was ...

Direct measurement of spatial Wigner function with area-integrated detection

  • Banaszek K.
  • Dorrer C.
  • Mukamel E.
  • Walmsley I.

We demonstrate experimentally a novel technique for characterizing transverse spatial coherence using the Wigner distribution function. The presented method is based on measuring interference between a pair of rotated and displaced replicas of the input beam with an area-integrating detector, and it can be superior in regimes when array detectors ...

Salt Precipitation and Scale Control in Supercritical Water Oxidation - Part B: Commercial/Full-Scale Applications

  • Hodes M.
  • Marrone P.
  • Smith K.
  • Tester J.

Despite the potential of supercritical water oxidation (SCWO) as a viable technology for organic waste destruction, its commercial development has been hindered by the problems of corrosion and salt precipitation/solids buildup. The extremely low solubility of polar inorganic salts in the supercritical water environment causes salts present in the feed, ...

Salt Precipitation and Scale Control in Supercritical Water Oxidation--Part A: Fundamentals and Research

  • Hodes M.
  • Hong G.
  • Marrone P.
  • Smith K.
  • Tester J.

Supercritical water oxidation (SCWO) is an effective technology for treatment of organics and organic components of aqueous wastes. Commercialization of SCWO processes has been hindered by concerns about corrosion and scale buildup/fouling which, when present, must be accommodated by system design and/or operational procedures. Salts are formed during SCWO when ...

Return-to-zero modulation with electrically continuously tunable duty cycle using a single NRZ modulator

  • Chandrasekhar S.
  • Winzer P.

We discuss two optical return-to-zero (RZ) modulation techniques, both based on a single Mach-Zehnder modulator driven by non- return-to-zero (NRZ) electrical signals. Both methods allow for continuously electrically tunable duty cycles and lead to chirped RZ formats.

Collision-induced time shift of a dispersion-managed soliton and its minimization in wavelength-division-multiplexed transmission

  • Liu X.
  • Mckinstrie C.
  • Mollenauer L.
  • Wei X.
  • Xie C.

The formula for the time shift of a dispersion-managed soliton that results from its collision with other solitons in different channels consists of two terms, one related to the frequency shift during the collision, and the other related to the residual frequency shift after the collision. It is found that ...

Outage Capacity with two-bit channel feedback for a two-transmit and single receive antenna system

  • Moustakas A.
  • Simon S.

Channel information at the transmitter is known to significantly increase the information throughput. However, practical constraints in the opposite link limit the possible amount of feedback. In this paper we describe a way to calculate the capacity of a simple, yet relevant feedback scheme. In particular, we consider the case ...

On The Uplink of a Cellular System with Imperfect Power Control and Multiple Services

  • Morrison J.
  • Whiting P.

We analyse a single cell wireless uplink using Code Division Multiple Access (CDMA) to resolve interference between a number of data users (of different classes). Received power control (with a lognormal error) is used to manage this interference. There is an outage probability that a user's signal-to-noise ratio requirement will ...

Optimization of broadband Quantum Cascade lasers for continuous wave operation

  • Capasso F.
  • Cho A.
  • Gmachl C.
  • Peabody M.
  • Sergent A.
  • Sivco D.
  • Soibel A.

We have optimized the design of the broadband quantum cascade laser for continuous wave operation. The improved design leads to a gain ripple about 4 1/cm over more than 0.5 micron spectral range. Simultaneous continuous wave emission at several wavelengths spanning the range between 6.7 and 7.4 micron has been ...

Performance Degradation due to Polarization Effects in a Dispersion- Managed Soliton Recirculating Loop System

  • Grant A.
  • Liu X.
  • Mollenauer L.
  • Xie C.

We investigate the performance degradation in dispersion-managed soliton systems caused by polarization dependent loss (PDL) and polarization mode dispersion (PMD) using a 600 km recirculating loop. We show that in an ultra-long haul transmission system, polarization effects can easily induce a variation in the bit error rate (BER) greater than ...

Crystalline Silicon Tilting Mirrors for Optical Cross Connect Switches

  • Bogart G.
  • Busch P.
  • Carr D.
  • Greywall D.
  • Pardo F.
  • Soh H.

This paper discusses a two-piece approach for fabricating two- dimensional arrays of tilting MEMS mirrors with application in very-large optical cross connect switches. In the new process a two-sided etching of SOI wafers is used to create crystalline mirrors on a first wafer that is later aligned and bonded to ...

Optical Switch Fabrics for Ultra-High Capacity IP-Routers

  • Bernasconi P.
  • Bhardwaj A.
  • Duelk M.
  • Gripp J.
  • Laznicka O.
  • Simsarian J.
  • Zirngibl M.

Next-generation switches and routers may rely on optical switch fabrics to overcome cost, power, space and scalability problems that arise in sizing traditional electrical backplanes into the terabit regime. In this paper we present and discuss several optical switch fabric technologies. We describe a promising approach based on arrayed waveguide ...

Dopant mapping for the nanotechnology age

  • Castell M.
  • Muller D.
  • Voyles P.

Dopant atoms in semiconductors need to be imaged with increasing precision to help keep Moore’s law on track. The ideal technique must be able to detect single dopants with atomic precision, and to distinguish between electrically active and inert dopants. Neither is an easy task.

A Sensitivity Result for Semidefinite Programs

  • Freund R.
  • Jarre F.

We study the sensitivity of strictly complementary solutions of linear semidefinite programs when the data is subject to small arbitrary changes. We show that the perturbations of the solutions are differentiable functions of the perturbations of the data, and we characterize the derivatives. This result improves upon earlier results that ...

Squeezing Quantum Information through a Classical Channel: Measuring the ``Quantumness'' of a Set of Quantum States

  • Fuchs C.
  • Sasaki M.

In this paper we propose a general method to quantify how "quantum" a set of quantum states is. The idea is to gauge the quantumness of the set by the worst-case difficulty of transmitting the states through a purely classical communication channel. Potential applications of this notion arise in quantum ...

Classical and Quantum communication without a shared reference frame

  • Bartlett S.
  • Rudolph T.
  • Spekkens R.

We show that communication without a shared reference frame is possible by employing entangled states. We prove that the amount of classical information that can be communicated without a shared reference frame asymptotically approaches one classical bit per quantum bit (qubit) sent, and that the number of encoded qubits which ...

Iterative MIMO ML detection with on-line initialization selection for unknown channels and unstructured asynchronous interference

  • Kuzminskiy A.

An iterative maximum likelihood (ML) detection for multiple transmit and receive antennas (MIMO) systems under asynchronous interference scenario is addressed. It has been observed that depending on the overlapping between interference and the training interval different initializations are required for the iterative ML scheme. A re-configurable receiver is proposed, which ...