[1]红外动目标识别跟踪系统的dsp+fpga实现




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Optic Communication


338

Author(s): Song, XZ (Song, Xiaozheng); Liu, L (Liu, Lu); Tang, JX (Tang, Junxiong)

Title: High-accuracy angle detection for ultra-wide-field-of-view acquisition in wireless optical links - art. no. 025010

Source: OPTICAL ENGINEERING, 47 (2): 25010-25010 FEB 2008

Abstract:

A novel scheme to deploy a point-to-multipoint optical wireless communication network is proposed. The master node provides hemispherical field-of-view (FOV) acquisition via a fisheye lens to achieve the automatic establishment of optical links with user nodes. We present an effective distortion-correcting algorithm based on two-ary piecewise bicubic spline interpolation to correct the large optical distortions of the fisheye lens. Using this algorithm, the angles of the incident beams are accurately calculated according to the laser spot position on the CCD (charge-coupled device) sensor with the maximum error of 0.027 deg. In addition, the strong background radiation from such an ultrawide FOV also leads to significant degradation of the angle detection accuracy under the condition of weak received optical power. A Voigt anomalous dispersion optical filter with ultra-narrow-pass bandwidth is adopted to resist the background radiation. The numerical simulation results show that the total angle detection error caused by the optical distortion and the background radiation is within 0.06 deg. Considering the extra gimbal pointing error and the angle-of -arrival fluctuations due to atmospheric turbulence, the pointing error of the master node is less than 0.079 deg, which meets the high-accuracy requirement of pointing for the automatic optical link establishment. (c) 2008 Society of Photo-Optical Instrumentation Engineers.


Addresses: Peking Univ, Sch Elect Engn & Comp Sci, Inst Elect Engn, Beijing, Peoples R China

Reprint Address: SONG, XZ, PEKING UNIV, SCH ELECT ENGN & COMP SCI, INST ELECT ENGN, POB 100-871, BEIJING, PEOPLES R CHINA

Author's E-mail: luliu@pku.edu.cn

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339

Author(s): Kandyba, EE (Kandyba, Eve E.); Hodgins, MB (Hodgins, Malcolm B.); Martin, PE (Martin, Patricia E.)



Title: A murine living skin equivalent amenable to live-cell imaging: Analysis of the roles of Connexins in the epidermis

Source: JOURNAL OF INVESTIGATIVE DERMATOLOGY, 128 (4): 1039-1049 APR 2008

Abstract:

Three-dimensional (3D) organotypic models are increasingly used to study the aspects of epidermal organisation and cutaneous wound-healing events. However, these are largely dependent on laborious histological analysis and immunohistochemical approaches. Despite the large resource of transgenic and knockout mice harboring mutations relevant to skin disorders, few organotypic mouse skin models are available. We have developed a versatile in vitro 3D organotypic mouse skin equivalent that reflects epidermal organisation in vivo. The system is optically transparent and ideally suited to real-time analysis using a variety of integrated in situ imaging techniques. As a paradigm for coordination of cellular events, the epidermal gap junction network was investigated and the model displayed predominant connexin 43 (Cx43) expression in basal proliferating cells and Cx26 and Cx30 expression in differentiated keratinocytes. We show that attenuation of Cx43-mediated communication by a Cx mimetic peptide enhanced wound closure rates in keratinocyte monocultures and in the living skin equivalent system, emphasising the utility of the model to systematically unravel the molecular mechanisms underlying epidermal morphogenesis, assess promising therapeutic strategies, and reduce animal experimentation. Furthermore, we visualise epidermal regeneration following injury in real time, thereby facilitating avenues to explore distinctive modes of wound re-epithelialisation in a non-invasive manner.


Addresses: Glasgow Caledonian Univ, Sch Life Sci, Dept Biol & Biomed Sci, Glasgow G4 0BA, Lanark, Scotland

Reprint Address: MARTIN, PE, GLASGOW CALEDONIAN UNIV, SCH LIFE SCI, DEPT BIOL & BIOMED SCI, GLASGOW G4 0BA, LANARK, SCOTLAND

Author's E-mail: patricia.martin@gcal.ac.uk

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340

Author(s): Ji, H (Ji, Hong); Rousseau, DL (Rousseau, Denis L.); Yeh, SR (Yeh, Syun-Ru)



Title: Heme-heme communication during the alkaline-induced structural transition in cytochrome c oxidase

Source: JOURNAL OF INORGANIC BIOCHEMISTRY, 102 (3): 414-426 MAR 2008

Abstract:

Alkaline-induced conformational changes at pH 12.0 in the oxidized as well as the reduced state of cytochrome C oxidase have been systematically studied with time-resolved optical absorption and resonance Raman spectroscopies. In the reduced state, the heme a(3) first converts from the native five-coordinate configuration to a six-coordinate bis-histidine intermediate as a result of the coordination of one of the CUB ligands, H290 or H291, to the heme iron. The coordination state change in the heme a3 causes the alteration in the micro-environment of the formyl group of the heme a3 and the disruption of the H-bond between R38 and the formyl group of the heme a. This structural transition, which occurs within 1 min following the initiation of the pH jump, is followed by a slower reaction, in which Schiff base linkages are formed between the formyl groups of the two hemes and their nearby amino acid residues, presumably R38 and R302 for the heme a and a3, respectively. In the oxidized enzyme, a similar Schiff base modification on heme a and a3 was observed but it is triggered by the coordination of the H290 or H291 to heme a3 followed by the breakage of the native proximal H378-iron and H376-iron bonds in heme a and a3, respectively. In both oxidation states, the synchronous formation of the Schiff base linkages in heme a and a3 relies on the structural communication between the two hemes via the H-bonding network involving R438 and R439 and the propionate groups of the two hemes as well as the helix X housing the two proximal ligands, H378 and H376, of the hemes. The heme-heme communication mechanism revealed in this work may be important in controlling the coupling of the oxygen and redox chemistry in the heme sites to proton pumping during the enzymatic turnover of CcO. (C) 2007 Elsevier Inc. All rights reserved.


Addresses: Yeshiva Univ Albert Einstein Coll Med, Dept Physiol & Biophys, Bronx, NY 10461 USA

Reprint Address: ROUSSEAU, DL, YESHIVA UNIV ALBERT EINSTEIN COLL MED, DEPT PHYSIOL & BIOPHYS, BRONX, NY 10461 USA

Author's E-mail: rousseau@aecom.yu.edu

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341

Author(s): Yang, JB (Yang, Junbo); Su, XY (Su, Xianyu); Ping, X (Ping, Xu)



Title: A module design of rearrangeable nonblocking double omega optical network using binary optics elements

Source: OPTICS AND LASER TECHNOLOGY, 40 (5): 756-767 JUL 2008

Abstract:

Omega network plays an important role in all optical communication and optical interconnection networks. In this paper, a novel technology, which binary optics element (micro-blazed grating array) can realize perfect shuffle transform including inverse perfect shuffle and left perfect shuffle, is proposed. Moreover, by a cascade of inverse perfect shuffle and left perfect shuffle, a multistage rearrangeable nonblocking omega network can be constructed. Simultaneously, the bipartition graph algorithm (BGA) is adopted to ascertain the state of node switch in each node stage (straight or crossover connection). At last, a module of the rearrangeable nonblocking omega network which is integrated with polarizing beam-splitter, half-wave plate, micro-blazed grating array, is presented. It can accomplish the functions of 8-channel signal beams' sorting and switching without routing conflict and blocking, and has advantages of being compact in structure, easy to integrate, efficient in performance etc. Finally, both the theoretical analysis and the experimental result show that this module proposed here may be helpful in free-space optical interconnection network and optical information processing. Crown Copyright (C) 2007 Published by Elsevier Ltd. All rights reserved.


Addresses: Natl Univ Def Technol, Changsha 410073, Peoples R China

Sichuan Univ, Dept Optoelect, Chengdu 610064, Peoples R China

Shenzhen Univ, Coll Elect Sci & Technol, Shenzhen 518060, Peoples R China

Reprint Address: YANG, JB, NATL UNIV DEF TECHNOL, CHANGSHA 410073, PEOPLES R CHINA

Author's E-mail: yangjunbo008@sohu.com

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342

Author(s): Hu, LC (Hu, Li-Chiang); Liu, NH (Liu, Nan-Hsin); Yang, LC (Yang, Lan-Chih); Lin, HC (Lin, Huang-Chang); Tsao, SL (Tsao, Shyh-Lin)



Title: Time and frequency observation of pulse amplitude equalization of harmonic mode-locked fiber laser

Source: MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, 50 (4): 957-961 APR 2008

Abstract:

In this article, we achieve the output observation in nine and frequency domain of a rational harmonic mode-locked fiber laser (RHMLFL). The pulse amplitude of pulse train is equalized by operating at nonlinear modulation transfer junction region of active modulator in RHMLFL. Without adding any other additional predistortion components, amplitude equalized short pulses up to the fourth order rational harmonic mode-locking are successfully demonstrated for 7.5, 10, and 15 GHz. One call extend such a method for various mode-locked lasers even with much higher repetition rates. (C) 2008 Wiley Periodicals, Inc.


Addresses: Natl Taiwan Normal Univ, Inst Electroopt Sci & Technol, Opt Fiber Syst Lab, Taipei 116, Taiwan

Reprint Address: TSAO, SL, NATL TAIWAN NORMAL UNIV, INST ELECTROOPT SCI & TECHNOL, OPT FIBER SYST LAB, 88,SEC 4,TING CHOU RD, TAIPEI 116, TAIWAN

Author's E-mail: jimmyslt@ntnu.edu.tw

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343

Author(s): Gambarutol, E (Gambarutol, Elvio); Richharia, M (Richharia, M.); Trachtman, E (Trachtman, Eyal)



Title: Land vehicular propagation channel characterization of BGAN system

Source: INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS AND NETWORKING, 26 (2): 85-117 MAR-APR 2008

Abstract:

This paper summarizes the results of a measurement campaign, which set out to characterize Inmarsat's broadband global area network extension (BGAN-X) L-band land vehicular (LV) channels as a function of elevation angle and candidate antenna systems. Measurements were conducted with three types of directional antennas on motorway routes around London using Inmarsat's Indian Ocean Region (IOR), Atlantic Ocean Region-East (AOR-E) and Atlantic Ocean Region-West (AOR-W) satellite transmissions, corresponding to elevation angles of, respectively, similar to 7.5 degrees, similar to 13 degrees and similar to 30 degrees. Simultaneous recordings of data on two types of directive receivers enabled correlation of several channel parameters. Statistics were used to refine a baseline model that derived BGAN-X LV channel parameters by scaling the statistics obtained from an omni-directional antenna receiver. The measurements demonstrate that Ricean mean and Ricean factor vary significantly over the chosen routes at elevation angles below similar to 13 degrees. Further, the Doppler shift of the direct path can be predicted accurately. A qualitative analysis indicates that the multipath Doppler spread is generally (not always) caused by uniform scattering around the vehicle over short distances and undergoes spatial filtering due to the receiver antenna. A technique was established to derive statistics of a two-state Markovian channel model at any specified fading threshold by gathering tracking system state, thereby allowing one to ascertain service expectations and operational parameters such as connection time-out of a packet-switched system or reliability threshold of a circuit-switched system. The technique was used to identify and select appropriate routes, particularly for the IOR and the AOR-W regions. Data analysis is in progress to establish the reason for the slow variations of signal mean at low-elevation angles in Ricean conditions and to derive appropriate statistical models. Furthermore, image processing of the video recordings is expected to reveal the extent of optical and RF fades correlation. Copyright (c) 2008 John Wiley & Sons, Ltd.


Addresses: Orizzonti Ltd, London NW11 7ET, England

Reprint Address: GAMBARUTOL, E, ORIZZONTI LTD, 7 DINGWALL GARDENS, LONDON NW11 7ET, ENGLAND

Author's E-mail: gambaruto@iee.org

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344

Author(s): Kagawa, K (Kagawa, Keiichiro); Asazu, H (Asazu, Hiroaki); Nunoshita, M (Nunoshita, Masahiro); Hta, J (Hta, Jun)



Title: A vision chip with column-level amplification of optical data signals for indoor optical wireless local area networks

Source: OPTICAL REVIEW, 15 (1): 6-10 JAN-FEB 2008

Abstract:

We present a vision chip architecture with column-level photo-amplification of optical data signals for optical wireless local area networks (LANs) to reduce the pixel area. Based on the architecture, we have fabricated a prototype vision chip in a standard 0.8 mu m bipolar complementary metal-oxide-semiconductor (BiCMOS) technology. The device offers position detection of other optical transceivers in the LAN and 4-ch concurrent high-speed optical data acquisition. A data rate of 400 Mbps was demonstrated. The pixel size was 125 mu m square, which can be shrunk to smaller than around 60 mu m square in 0.35 mu m or more advanced BiCMOS or CMOS technologies. (C) 2008 The Optical Society of Japan.


Addresses: Osaka Univ, Grad Sch Informat Sci & Technol, Suita, Osaka 5650871, Japan

Nara Inst Sci & Technol, Grad Sch Mat Sci, Nara 6300101, Japan

Reprint Address: KAGAWA, K, OSAKA UNIV, GRAD SCH INFORMAT SCI & TECHNOL, 2-2 YAMADAOKA, SUITA, OSAKA 5650871, JAPAN

Author's E-mail: kagawa@ist.osaka-u.ac.jp

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345


Author(s): Chen, YA (Chen, Yu-Ao); Chen, S (Chen, Shuai); Yuan, ZS (Yuan, Zhen-Sheng); Zhao, B (Zhao, Bo); Chuu, CS (Chuu, Chih-Sung); Schmiedmayer, J (Schmiedmayer, Joerg); Pan, JW (Pan, Jian-Wei)

Title: Memory-built-in quantum teleportation with photonic and atomic qubits

Source: NATURE PHYSICS, 4 (2): 103-107 FEB 2008

Abstract:

The combination of quantum teleportation(1) and quantum memory(2-5) of photonic qubits is essential for future implementations of large-scale quantum communication(6) and measurement-based quantum computation(7,8). Both steps have been achieved separately in many proof-of-principle experiments(9-14), but the demonstration of memory-built-in teleportation of photonic qubits remains an experimental challenge. Here, we demonstrate teleportation between photonic (flying) and atomic (stationary) qubits. In our experiment, an unknown polarization state of a single photon is teleported over 7 m onto a remote atomic qubit that also serves as a quantum memory. The teleported state can be stored and successfully read out for up to 8 mu s. Besides being of fundamental interest, teleportation between photonic and atomic qubits with the direct inclusion of a readable quantum memory represents a step towards an efficient and scalable quantum network(2-8) .
Addresses: Univ Heidelberg, Inst Phys, D-69120 Heidelberg, Germany

Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China

Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China

TU Wien, Atominst Osterreich Univ, A-1020 Vienna, Austria

Reprint Address: CHEN, YA, UNIV HEIDELBERG, INST PHYS, PHILOSOPHENWEG 12, D-69120 HEIDELBERG, GERMANY

Author's E-mail: yuao@physi.uni-heidelberg.de

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346


Author(s): Teitelbaum, ME (Teitelbaum, Michael E.); Yarlagadda, S (Yarlagadda, Shridhar); O'Brien, DJ (O'Brien, Daniel J.); Wetzel, ED (Wetzel, Eric D.); Goossen, KW (Goossen, Keith W.)

Title: Normal incidence free space optical data porting to embedded communication links

Source: IEEE TRANSACTIONS ON COMPONENTS AND PACKAGING TECHNOLOGIES, 31 (1): 32-38 MAR 2008

Abstract:

In this paper, various techniques for normal incidence, free-space optical data porting to embedded data busses are presented. In the first approach, externally powered optical transmitter and receiver devices are coupled to an embedded electrical bus. This embedded link proves to be reliable through environmental and mechanical testing, and demonstrates data transmission up to 10 kHz. A self-powered transceiver is then fabricated and coupled to an optical fiber, showing data transmission up to 1 MHz. Finally, a self-powered bus using a dye-impregnated optical fiber is demonstrated to operate at speeds greater than 15 MHz. All methods explored overcome many of the problems associated with traditional physical connectorization, and are suitable for normal incidence remote querying of embedded passive elements, active devices, sensors, or networks.
Addresses: Univ Delaware, Dept Elect & Comp Engn, Ctr Composite Mat, Newark, DE 19716 USA

USA, Res Lab, Aberdeen, MD 21005 USA

Reprint Address: TEITELBAUM, ME, UNIV DELAWARE, DEPT ELECT & COMP ENGN, CTR COMPOSITE MAT, NEWARK, DE 19716 USA

Author's E-mail: mt@udel.edu

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347


Author(s): McKinstrie, CJ (McKinstrie, C. J.); Van Enk, SJ (van Enk, S. J.); Raymer, MG (Raymer, M. G.); Radic, S (Radic, S.)

Title: Multicolor multipartite entanglement produced by vector four-wave mixing in a fiber

Source: OPTICS EXPRESS, 16 (4): 2720-2739 FEB 18 2008

Abstract:

Multipartite entanglement is a resource for quantum communication and computation. Vector four-wave mixing (FWM) in a fiber, driven by two strong optical pumps, couples the evolution of four weak optical sidebands (modes). Depending on the fiber dispersion and pump frequencies, the mode frequencies can be similar (separated by less than 1 THz) or dissimilar (separated by more than 10 THz). In this report, the discrete- and continuous-variable entanglement produced by vector FWM is studied in detail. Formulas are derived for the variances of, and correlations between, the mode quadratures and photon numbers. These formulas and related results show that the modes are four-partite entangled. (C) 2008 Optical Society of America.
Addresses: Alcatel Lucent, Bell Labs, Holmdel, NJ 07733 USA

Univ Oregon, Dept Phys, Eugene, OR 97403 USA

Univ Oregon, Oregon Ctr Opt, Eugene, OR 97403 USA

Univ Calif San Diego, Dept Elect & Comp Engn, La Jolla, CA 92093 USA

Reprint Address: MCKINSTRIE, CJ, ALCATEL LUCENT, BELL LABS, HOLMDEL, NJ 07733 USA

Author's E-mail: mckinstrie@alcatel-lucent.com

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348


Author(s): Machuca, CM (Machuca, Carmen Mas); Moe, O (Moe, Oyvind); Jager, M (Jaeger, Monika)

Title: Impact of protection schemes and network component's availability on operational expenditures

Source: JOURNAL OF OPTICAL NETWORKING, 7 (2): 142-150 FEB 1 2008

Abstract:

The high capacity of communication networks nowadays has encouraged the study of the high impact that failures have on the data transmission and the service quality. This impact is usually evaluated as the quantity of affected data as well as the duration of the failure. However, the impact also has economic consequences such as the cost of the personnel required to repair the failures, the cost of the personnel to restore the services, penalties through possible service level agreement violations, etc. We evaluate the impact of the protection schemes and the network component's availability on the operational cost. (c) 2008 Optical Society of America.
Addresses: Tech Univ Munich, D-80333 Munich, Germany

T Syst Enterprise Serv GmbH, D-10589 Berlin, Germany

Reprint Address: MACHUCA, CM, TECH UNIV MUNICH, ARCISTR 21, D-80333 MUNICH, GERMANY

Author's E-mail: cmas@tum.de

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349


Author(s): Kilper, DC (Kilper, Daniel C.); White, CA (White, Christopher A.); Chandrasekhar, S (Chandrasekhar, S.)

Title: Control of channel power instabilities in constant-gain amplified transparent networks using scalable mesh scheduling

Source: JOURNAL OF LIGHTWAVE TECHNOLOGY, 26 (1-4): 108-113 JAN-FEB 2008

Abstract:

Experiments on a transparent, constant-gain-controlled amplifier ring network show that channel-power coupling can lead to instability in channel power control at add drop nodes. This instability can cause power oscillations due to competing adjustments on multiple nodes. Sequencing channel power tuning on each node is shown to result in stable power control. A distributed node scheduling algorithm that dynamically defines domains for independent node control is demonstrated through network simulations.
Addresses: Alcatel Lucent Inc, Opt Networks Res Dept, Bell Labs, Holmdel, NJ 07733 USA

Alcatel Lucent Inc, Math & Algorithm Sci Res Ctr, Bell Labs, Murray Hill, NJ 07974 USA

Reprint Address: KILPER, DC, ALCATEL LUCENT INC, OPT NETWORKS RES DEPT, BELL LABS, 101 CRAWFORD CORNER RD, HOLMDEL, NJ 07733 USA

Author's E-mail: dkilper@alcatel-lucent.com

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350


Author(s): Kikuchi, N (Kikuchi, Nobuhiko); Mandai, K (Mandai, Kohei); Sekine, K (Sekine, Kenro); Sasaki, S (Sasaki, Shinya)

Title: Incoherent 32-level optical multilevel signaling technologies

Source: JOURNAL OF LIGHTWAVE TECHNOLOGY, 26 (1-4): 150-157 JAN-FEB 2008

Abstract:

In order to explore the potential of optical multilevel signaling for high-speed optical fiber networks, an incoherent 50 Gbit/s 32-level optical multilevel signaling (combination of QASK and 8-DPSK) is demonstrated, for the first time. The application of an ISI-suppressed modulation technique, an orthogonally-coupled differential detection technique and the digital signal processing technique have also been proposed and verified to enhance the performance of multilevel signaling. A 100-km dispersion shifted fiber transmission has also been performed, and the degradation via optical fiber nonlinear effect, self-phase modulation (SPM), is observed. The receiver side simple digital cancellation technique of the SPM-induced phase shift is also proposed and experimentally demonstrated with more than 6.8 dB increase of fiber input power.
Addresses: Hitachi Ltd, Cent Res Lab, Kokubunji, Tokyo 1858601, Japan

Hitachi Communicat Technol Ltd, Kanagawa 2448567, Japan

Reprint Address: KIKUCHI, N, HITACHI LTD, CENT RES LAB, KOKUBUNJI, TOKYO 1858601, JAPAN

Author's E-mail: nobuhiko.kikuchi.ca@hitachi.com

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351


Author(s): Martinez, JJ (Jose Martinez, Juan); Gregorio, JIG (Garces Gregorio, Juan Ignacio); Lucia, AL (Lopez Lucia, Alicia); Velasco, AV (Villafranca Velasco, Asier); Aguado, JC (Carlos Aguado, Juan); Binue, MAL (Losada Binue, Maria Angeles)

Title: Novel WDM-PON architecture based on a spectrally efficient IM-FSK scheme using DMLs and RSOAs

Source: JOURNAL OF LIGHTWAVE TECHNOLOGY, 26 (1-4): 350-356 JAN-FEB 2008

Abstract:

This paper proposes a wavelength-division-multiplexing passive optical network architecture with colorless user terminals based on the use of a different modulation scheme for each way of communication. Narrow-frequency-shift keying (FSK) modulation obtained by direct modulation of a distributed feedback laser has been used for the downstream channel, and intensity modulation has been used for the upstream channel. The performance of a link based on this scheme has been assessed, with particular emphasis on the description of the narrow-FSK modulation technique and its range of applicability in terms of bit rates and power levels. The operation of the architecture is demonstrated by simultaneously transmitting Ethernet frames at 1.25 Gb/s (gigabit Ethernet) in both the upstream and downstream channels. Error rates for downstream and upstream channels show excellent performance for distances up to 50 km.
Addresses: Lab Opt Transmiss & Broadband Technol TOYBA, Photon Technol Grp GTF i3A, Cuarte 22197, Huesca, Spain

Univ Zaragoza CPS, Dept Ingn Elect & Comunicac, Photon Technol Grp GTF i3A, Zaragoza 50009, Spain

Univ Valladolid, Dept Teor Senal & Comunicac & Ingn Telemat, E-47011 Valladolid, Spain

Reprint Address: MARTINEZ, JJ, LAB OPT TRANSMISS & BROADBAND TECHNOL TOYBA, PHOTON TECHNOL GRP GTF I3A, WALQA TECHNOL PK, CUARTE 22197, HUESCA, SPAIN

Author's E-mail: jjosemar@unizar.es

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352

Author(s): Rashvand, HF (Rashvand, H. F.); Zeng, Y (Zeng, Y.); Green, RJ (Green, R. J.); Leeson, MS (Leeson, M. S.)



Title: Look-up table error correcting multiple pulse PPM codes for wireless optical communication channels

Source: IET COMMUNICATIONS, 2 (1): 27-34 JAN 2008

Abstract:

Performance of optical wireless communication (OWC) systems can be optimised using constant optical power transmission in conjunction with forward error control coding. A new family of constant power error correcting codes using multiple pulse position modulation optical transmission are introduced. This doubly featured technique may extend the capability of many difficult wireless optical links beyond their existing barriers and may enable a higher error performance for OWC networks. The potential and design of look-up table codes are investigated. The Monte Carlo methods provide supportive data for the performance and code word search.


Addresses: Univ Warwick, Sch Engn, Coventry CV4 7AL, W Midlands, England

Univ Warwick, Adv Commun Syst Ltd, C&W Acad Consultant, Coventry CV4 7AL, W Midlands, England

Reprint Address: RASHVAND, HF, UNIV WARWICK, SCH ENGN, COVENTRY CV4 7AL, W MIDLANDS, ENGLAND

Author's E-mail: h.rashvand@warwick.ac.uk

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353


Author(s): Cruz, RL (Cruz, R. L.); Al-Harthi, S (Al-Harthi, Saleh)

Title: A service-curve framework for packet scheduling with switch configuration delays

Source: IEEE-ACM TRANSACTIONS ON NETWORKING, 16 (1): 196-205 FEB 2008

Abstract:

In modern packet switches, technology limitations may introduce switch configuration delays that are non-negligible compared with the time required to transmit a single packet. In this paper, we propose a methodology for scheduling of packets, in the context of these technology limitations. If the total tolerable delay through a packet switch is at least on the order of the switch configuration delay, we show that a near 100% utilization of the communication links is possible, while providing strict quality of service guarantees. The main idea is to increase the quantum with which data is scheduled and switched to beyond that of a single packet. This also decreases the rate at which scheduling need to be made, and hence decreases the implementation complexity. The quality of service guarantees we consider are in terms of a service curve. Specifically, we present a framework for the provision of service curves while coping with non-negligible switch configuration delays.
Addresses: Univ Calif San Diego, Dept Elect & Comp Engn, La Jolla, CA 92093 USA

Saudi Telecom Co, Riyadh, Saudi Arabia

Reprint Address: CRUZ, RL, UNIV CALIF SAN DIEGO, DEPT ELECT & COMP ENGN, LA JOLLA, CA 92093 USA

Author's E-mail: cruz@ece.ucsd.edu

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354


Author(s): Hong, JK (Hong, Jong-Kyun); Lee, SS (Lee, Sang-Sun)

Title: PLC-based novel triplexer with a simple structure for optical transceiver module applications

Source: IEEE PHOTONICS TECHNOLOGY LETTERS, 20 (1-4): 21-23 JAN-FEB 2008

Abstract:

A novel triplexer is introduced for optical communication applications in this letter. The triplexer consists of two cascaded multimode interference (MMI) couplers and can be fabricated by planar lightwave circuit technology. The concept of the extraneous self-imaging phenomenon, which is not generally mentioned in MMI theory, is applied to this triplexer to design a relatively simple and compact device. From the simulation results for wavelengths of 1310, 1490, and 1550 nm, the excess losses were determined to be -1.37, -0.63, and -0.79 dB, respectively, while the extinction ratios were 15.93, 24.28, and 18.44 dB, respectively.
Addresses: Hanyang Univ, Div Elect & Comp Engn, Seoul 133791, South Korea

Reprint Address: HONG, JK, HANYANG UNIV, DIV ELECT & COMP ENGN, SEOUL 133791, SOUTH KOREA

Author's E-mail: holyhjk@hanyang.ac.kr

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355

Author(s): Bottger, G (Boettger, G.); Dreschmann, M (Dreschmann, M.); Klamouris, C (Klamouris, C.); Hubner, M (Huebner, M.); Roeger, M (Roeger, M.); Bett, AW (Bett, A. W.); Kueng, T (Kueng, T.); Becker, J (Becker, J.); Freude, W (Freude, W.); Leuthold, J (Leuthold, J.)



Title: An optically powered video camera link

Source: IEEE PHOTONICS TECHNOLOGY LETTERS, 20 (1-4): 39-41 JAN-FEB 2008

Abstract:

An optically powered camera sensor link is demonstrated. Power and data are transmitted over a 62.5-mu m multimode glass fiber. Uncompressed video with 640 x 480 pixels resolution is streamed continuously at 100 Mb/s as soon as the fiber is illuminated with sufficient optical power. No energy has to be stored at the sensor location in batteries with limited capacities and lifetimes. Inexpensive fiber optics and low-power state-of-the-art electronics are used to make >100 mW available at sites which have no direct access to an electrical network. There is a complete electrical isolation between the remote camera unit and a base station.


Addresses: Univ Karlsruhe, D-76131 Karlsruhe, Germany

Fraunhofer Inst Solar Energy Syst, ISE, D-79110 Freiburg, Germany

Reprint Address: BOTTGER, G, UNIV KARLSRUHE, KAISERSTR 12, D-76131 KARLSRUHE, GERMANY

Author's E-mail: g.boettger@ihq.uni-karlsruhe.de

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356


Author(s): Cincotti, G (Cincotti, Gabriella); Manzacca, G (Manzacca, Gianluca); Wang, X (Wang, Xu); Miyazaki, T (Miyazaki, Tetsuya); Wada, N (Wada, Naoya); Kitayama, KI (Kitayama, Ken-ichi)

Title: Reconfigurable multiport optical encoder/decoder with enhanced auto-correlation

Source: IEEE PHOTONICS TECHNOLOGY LETTERS, 20 (1-4): 168-170 JAN-FEB 2008

Abstract:

A novel planar configuration of a multiport encoder/decoder (E/D) is presented that has enhanced performance in terms of beat-noise suppression and network confidentiality. We insert a splitter and a set of phase shifters in front of a standard arrayed-waveguide-grating-based multiport E/D to generate spectral-phase codes. The new configuration keeps the same key features and it is able to generate/process a set of different codes simultaneously; at the same time, the network confidentiality is enhanced, because only the intended receiver, which knows the phase-shifter values, is able to recognize the code. Furthermore, whereas the auto-correlation function of the previous E/D has a triangular shape, in this case it is similar to the input pulse, enhancing the system cascadability and reducing the beat noise.
Addresses: Univ Roma Tre, Dept Appl Elect, I-00146 Rome, Italy

Natl Inst Informat & Commun Technol, Photon Network Grp, New Generat Network Res Ctr, Koganei, Tokyo 1848795, Japan

Osaka Univ, Dept Elect Elect & Informat Engn, Suita, Osaka 5650871, Japan

Reprint Address: CINCOTTI, G, UNIV ROMA TRE, DEPT APPL ELECT, I-00146 ROME, ITALY

Author's E-mail: cincotti@uniroma3.it

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357

Author(s): Huiszoon, B (Huiszoon, B.); de Waardt, H (de Waardt, H.); Khoe, GD (Khoe, G. D.); Koonen, AMJ (Koonen, A. M. J.)



Title: Performance analysis of an integrated spectral OCDMA technique including coupler imbalance

Source: IEEE PHOTONICS TECHNOLOGY LETTERS, 20 (1-4): 276-278 JAN-FEB 2008

Abstract:

In this letter, we show, for the first time, that an integrated spectral optical code-division multiple-access (OCDMA) technique has a comparable performance with respect to coherent OCDMA techniques based on a crosstalk analysis. The code set is further studied on its resilience against imbalances in the 3-dB couplers of the en/decoders (E/Ds). The orthogonality remains acceptable for imbalance penalties up to 1 dB. The analysis done in the letter considers a cascade and a tree E/D which shows negligible differences in performance.


Addresses: Eindhoven Univ Technol, COBRA Res Inst, NL-5600 MB Eindhoven, Netherlands

Reprint Address: HUISZOON, B, EINDHOVEN UNIV TECHNOL, COBRA RES INST, POB 513, NL-5600 MB EINDHOVEN, NETHERLANDS

Author's E-mail: b.huiszoon@tue.nl

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