OPTICS 2012 Abstracts


Full Papers
Paper Nr: 10
Title:

Channel-encoded and SVD-assisted MIMO Multimode Transmission Schemes with Iterative Detection

Authors:

Sebastian Aust, Andreas Ahrens and Steffen Lochmann

Abstract: In this contribution a coherent (2 ×2) MIMO (multiple input multiple output) transmission with iterative detection over a measured multimode fiber channel at 1325 nm as well as at 1570 nm operating wavelength is studied. For the channel measurements a fibre length of 1,4 km were chosen. Extrinsic information transfer (EXIT) charts are used for analyzing and optimizing the convergence behaviour of the iterative demapping and decoding. Our results show that in order to achieve the best bit-error rate, not necessarily all MIMO layers have to be activated.

Paper Nr: 13
Title:

High Repetition Frequency Mode-locked Semiconductor Disk Laser

Authors:

Yanrong Song, Peng Zhang, Jinrong Tian, Zhigang Zhang, Hark Hoe Tan and C. Jagadish

Abstract: A compact passively mode-locked semiconductor disk laser with a high repetition frequency of 3GHz is demonstrated. 4.9ps pulse duration and 30mW average output power are obtained with 1.4W of 808nm incident pump power. The gain chip consists of 16 compressively strained InGaAs symmetrical step quantum wells in the active region.

Paper Nr: 17
Title:

Behavior Analysis of a Gaussian Beam Optical Trap in the Rayleigh Regime

Authors:

Niazul Islam Khan, A. S. M. Abdul Hye, M. D. Rejwanur Rashid Mojumdar and S. K. Shaid-Ur Rahman

Abstract: Recently optical trapping has emerged as a very powerful tool for manipulating micro and nanometer sized particles. In this paper, we present a comprehensive study of the behavior of nanometer sized trapped particles in a Gaussian beam optical trap using Rayleigh model of trapping forces. Along with the working principle of an optical trap, the force equations in the Rayleigh regime have been derived considering focused Gaussian beam. Then numerical simulations are performed for a 30 nm particle with refractive index 1.57 considering water as the surrounding medium. We assume that the wavelength of the light source to be 850 nm easily obtainable from cheap GaAs-based vertical-cavity surface-emitting laser technology. When the light hits a particle, it influences the particle with two forces–the scattering force in the direction of propagation and the gradient force in the direction of gradient of light intensity. We explore the effects of particle size, refractive index of the particle, beam waist radius, position of the particle with respect to the trap center both on scattering and gradient forces. This analysis will be helpful for understanding optical manipulation of nanoparticles and designing suitable trap modules for nanoparticle manipulation.

Short Papers
Paper Nr: 15
Title:

Budget Extension Schemes for Nx10 Gbit/s DPSK-based TDM/WDM PON

Authors:

A. Emsia, Q. T. Le, T. von Lerber, D. Briggmann and F. Kueppers

Abstract: We present a new TDM/WDM PON scheme utilizing PSK (phase shift-keying) at 10 Gbit/s per l-channel as the modulation format along the feeder line and an SOA (semiconductor optical amplifier) as the amplifying component at the remote node. One single DLI (Delay Line Interferometer) converts all l-channels from PSK to OOK (on-off keying), the modulation format which is used along the access line and one single SOA are experimentally demonstrated to be sufficient providing a power budget increase of up to 46.8 dB.

Paper Nr: 16
Title:

Success Probability Evaluation of Quantum Circuits based on Probabilistic CNOT-Gates

Authors:

Amor Gueddana, Rihab Chatta and Noureddine Boudriga

Abstract: In this paper, we study the effect of non deterministic CNOT gates on the success probability of Quantum CNOT-based circuits. Based on physical implementation, we define an abstract probabilistic model of the CNOT gate that takes into consideration error sources and realizability constraints. Using the proposed model, we simulate a three-qubit quantum adder and show the evolution of the probability of realizing correctly the SUM operation depending on the success probability and errors of the CNOT gates.

Paper Nr: 22
Title:

All-optical Multi-wavelength Virtual Memory Architecture - Design and Performances Analysis

Authors:

SelmaBatti Selma Batti, Mourad Zghal and Noureddine Boudriga

Abstract: As all-optical memory represents one of the most important lacks in evolution of optical networks; this paper presents an all-optical virtual memory based on a recirculation loop, with the goal of providing optical data unit storage in all-optical switching networks. The concept of multi-wavelength signal buffering is adopted, to realize a shared buffer with an important storage capacity. We propose the organization of the buffer in two loops, the first as a delay loop and the second as an amplification loop, to improve the buffering duration and performances. The memory implementation is demonstrated using optical components such as fiber Bragg gratings (FBG), circulator and tunable wavelength converter. An all-optical control unit is designed to provide a dynamic and automatic signal buffer managing. An analytical model is implemented and a simulations set is done to prove that the proposed architecture is able to confine several signals for a relatively long time as a memory and signals can leave the architecture for a reasonably short delay after the departure decision is taken. The low penalty observed shows good system reliability.

Posters
Paper Nr: 8
Title:

AMO-OFDM Signal Delivery of 20 Gbit/S throughput in 20-Km Single Loopback Fiber Link Employing Baseband I/Q Separation - Adaptive Optical OFDM Modulation and Separate I/Q Baseband Signal Transmission with Remotely-fed RSOAs for Colorless ONU in Next-generation WDM Access

Authors:

Jeong-Min Joo, Moon-Ki Hong, Dung Tien Pham and Sang-Kook Han

Abstract: We demonstrated a novel scheme to transmit 20-Gb/s adaptively modulated optical orthogonal frequency division multiplexed (AMO OFDM) signal employing separate in-phase (I) and quadrature (Q) channel baseband delivery in a 20-km single loopback fiber link based on 1-GHz reflective semiconductor optical amplifiers (RSOAs) for a colorless optical network unit (ONU). Adaptive loading process was applied to the OFDM signals to overcome the bandwidth limitation of RSOAs. The I and Q channel data streams in the OFDM signals were separately carried on individual optical carriers with different wavelengths without Hermitian Symmetry for baseband transmission. Our proposed scheme was experimentally demonstrated using a periodic property of free spectral range (FSR) in a wavelength multiplexer. The separated optical “dual” carriers were provided by the same port of a wavelength multiplexer to reduce the number of used WDM channels for a upstream.