Optical Society of America

Displaying 1-40 of 73 results

  • White Papers // Oct 2010

    All-Optical Intra-PON Data Routing Between ONUs With a MG-Y Tunable Laser as 2.5 Gbps Burst-Mode Transmitter

    Direct communication between ONUs is experimentally demonstrated with a tunable MG-Y laser in a ring+tree PON for 640 users, without passing electrically powered equipment. Access networks are a promising commercial segment for tunable laser diodes due to the need for colorless and cost-efficient customer premises equipment. The desired high user...

    Provided By Optical Society of America

  • White Papers // Jan 2011

    SOA/REAM as Vector Modulator for QAM Upstream

    Simultaneous encoding of information in the optical phase and amplitude for upstream transmission is demonstrated with an integrated SOA/REAM of small form factor. The crosstalk penalties between the QAM tributaries are assessed and discussed. Impressive strides have been made in the field of optical access, mostly fuelled by the rapid...

    Provided By Optical Society of America

  • White Papers // Oct 2010

    Virtualizing ADRENALINE Testbed for Deploying Dynamic GMPLS-Controlled WSON as a Service

    The emergence of new applications requiring specific network resources is forcing service providers to have control over the optical network infrastructure in order to support rapid and automated provisioning of different networks (i.e., with different network resources requirements) over the same optical network infrastructure. Virtualization of the optical network infrastructure...

    Provided By Optical Society of America

  • White Papers // Jan 2011

    Probe Schemes for Quality-of-Transmission-Aware Wavelength Provisioning

    Future all-optical networks will have to fulfill at least the same stringent service quality requirements as legacy optical networks. This is particularly challenging in the context of transparency in the optical transport layer because of the physical-layer (impairment) awareness it requires. In this paper, the authors introduce the concept of...

    Provided By Optical Society of America

  • White Papers // Jul 2011

    Lab Trial of a GMPLS Controlled MPLS-TP Packet Transport Network With Source/PCE Path Computations

    A lab trial validating the implemented GMPLS control plane for MPLS-TP in the ADRENALINE testbed is presented. The authors experimentally compare the establishment of bidirectional LSPs using either source or PCE-based path computations. The emergence of new packet-based services over Ethernet technology and applications (e.g., high definition IPTV) with different...

    Provided By Optical Society of America

  • White Papers // Jun 2010

    GMPLS-Based Multidomain Restoration: Analysis, Strategies, Policies and Experimental Assessment

    A connection spanning, for example, several countries crosses multiple optical backbone networks, each one controlled by different administrators or operators. In this context, the interworking of these networks is thus necessary to set up end-to-end optical connections. A key issue when delivering such optical services is the use of efficient...

    Provided By Optical Society of America

  • White Papers // Jan 2010

    Experimental Validation of End-to-End GMPLS-Enabled Restoration in Multi-Domain Transparent WSON

    Two GMPLS restoration strategies operating at wavelength and link granularities are experimentally validated in a multi-domain WSON. The strategies are qualitatively compared in terms of resource usage, restorability and restoration time. In Wavelength Switched Optical Networks (WSON), a link or node failure causes a huge amount of data loss. Fast...

    Provided By Optical Society of America

  • White Papers // Jul 2009

    Effects of Outdated Control Information in Control-Plane-Enabled Optical Networks With Path Protection

    New signaling suites for a distributed control plane in Wavelength Division Multiplexing (WDM) networks, such as Generalized MultiProtocol Label Switching (GMPLS) and Automatic Switched Optical Networks (ASON), allow one to cope with the increasing variability of traffic patterns to be supported by operators by providing a means to dynamically set...

    Provided By Optical Society of America

  • White Papers // Jul 2009

    Enhanced Backwards Recursive Path Computation for Multi-Area Wavelength Switched Optical Networks Under Wavelength Continuity Constraint

    In the context of the future Internet, all optical wavelength switched optical networks will play an important role in either evolutionary or revolutionary design paradigms. In any paradigm, Dense Wavelength Domain Multiplexing (DWDM) is the most cost-effective technology to increase bandwidth capacity. DWDM provides the basis for a core optical...

    Provided By Optical Society of America

  • White Papers // Sep 2011

    Offline Routing and Regenerator Placement and Dimensioning for Translucent OBS Networks

    The deployment of translucent optical networks is considered the most promising short term solution to decrease costs and energy consumption in optical backbone networks. In fact, translucent Wavelength Switched Optical Networks (WSONs) have recently received great attention from the research community due to their technological maturity. However, the inflexibility and...

    Provided By Optical Society of America

  • White Papers // Aug 2011

    Survivable IP/MPLS-Over-WSON Multilayer Network Optimization

    Network operators are facing the problem of dimensioning their networks for the expected huge IP traffic volumes while keeping constant or even reducing the connectivity prices. Therefore, new architectural solutions able to cope with the expected traffic increase in a more cost-effective way are needed. In this paper, the authors...

    Provided By Optical Society of America

  • White Papers // Jan 2012

    CAPEX Study for Grid Dependent Multi-Layer IP/MPLS-Over-EON Using Relative BV-WSS Costs

    The impact of the frequency grid on the CAPEX required to deploy a multi-layer IP/MPLS-over-EON is analyzed. Results showing significant savings at the electronic layer motivate the introduction of narrower grids with enhanced BV-WSS. The emergence of new disruptive bandwidth intensive services and applications has led to a huge surge...

    Provided By Optical Society of America

  • White Papers // Nov 2012

    Experimental Demonstration of a Cost-Effective Bit Rate Variable IM/DD Optical OFDM with Reduced Guard Band

    The authors experimentally demonstrate an intensity modulated and direct detection optical OFDM with variable bit rate from 5 Gb/s to 9 Gb/s using BPSK format. A fast processing based on the Hartley transform is performed with low complexity DSP, achieving the same performance as 4QAM FFT-based processing. Using the same...

    Provided By Optical Society of America

  • White Papers // Aug 2012

    GMPLS/PCE Control of Flexi-Grid DWDM Optical Networks Using CO-OFDM Transmission [Invited]

    Current optical transport networks use optical channel carriers (wavelengths) that are defined and constrained by a fixed ITU-T Dense Wavelength Division Multiplexing (DWDM) grid. Such a grid is not adapted to high data rates (beyond 100 Gb/s) and is inefficient when a wavelength is assigned to a low-rate optical signal....

    Provided By Optical Society of America

  • White Papers // Jun 2012

    A Dynamic Path-Computation Algorithm for a GMPLS-Enabled Multi-Layer Network

    With the appearance of new emerging IP packet-based services (e.g., high-definition IPTV, video-conferences, etc.) and applications with various bandwidth and Quality of Service (QoS) requirements, it is necessary to improve the current transport networks so that they can provide higher capacity, reliability and QoS in a cost-efficient manner. Wavelength-Switched Optical...

    Provided By Optical Society of America

  • White Papers // Feb 2012

    Distributed Sharing of Functionalities and Resources in Survivable GMPLS-Controlled WSONs

    Sharing of functionalities and sharing of network resources are effective solutions for improving the cost-effectiveness of Wavelength-Switched Optical Networks (WSONs). Such cost-effectiveness should be pursued together with the objective of ensuring the requested level of performance at the physical layer (i.e., quality of Transmission, QoT) and at the upper layer...

    Provided By Optical Society of America

  • White Papers // Oct 2011

    Experimental Demonstration of a Hybrid Operated MPLS-TP Transport Network for Dynamic Ethernet Service Provisioning and Restoration

    To achieve cost reduction, simplified operations and flexible scalability in the transport of IP and emerging Ethernet services, network operators need to migrate their optical transport technologies from the coarse aggregation and deterministic multiplexing of the legacy TDM-based SONET/SDH technology, towards efficient aggregation, statistical multiplexing and QoS management of the...

    Provided By Optical Society of America

  • White Papers // Feb 2012

    Statistical Approach for Fast Impairment-Aware Provisioning in Dynamic All-Optical Networks

    Physical Layer Impairments (PLIs) need to be considered in the Routing and Wavelength Assignment (RWA) process of all-optical networks to ensure the provisioning of good quality optical connections (i.e., light-paths). A convenient way to model the impact of PLIs on the signal quality is to use the so-called Q-factor. In...

    Provided By Optical Society of America

  • White Papers // Aug 2011

    Building Data Centers With Optically Connected Memory

    Future data centers will require novel, scalable memory architectures capable of sustaining high bandwidths while still achieving low memory access latencies. Electronic interconnects cannot meet the challenges presented by the need for multi-terabit off-chip memory data paths. In this paper, the electronic bus between main memory and its host processor...

    Provided By Optical Society of America

  • White Papers // Aug 2012

    Multicast Overlay for High-Bandwidth Applications Over Optical WDM Networks

    Multicast communication in Wavelength Division Multiplexed (WDM) networks is traditionally supported by the assumption that the optical cross-connects are multicast capable, i.e., they are capable of switching an incoming signal to more than one output interface. A na?ve method of supporting this functionality in a Multicast-Incapable (MI) environment is by...

    Provided By Optical Society of America

  • White Papers // Dec 2012

    Relay Selection Protocols for Relay-Assisted Free-Space Optical Systems

    The authors investigate transmission protocols for relay-assisted Free-Space Optical (FSO) systems, when multiple parallel relays are employed and there is no direct link between the source and the destination. As alternatives to all-active FSO relaying, where all the available relays transmit concurrently, they propose schemes that select only a single...

    Provided By Optical Society of America

  • White Papers // Apr 2013

    Capacity and Nonuniform Signaling for Discrete-Time Poisson Channels

    The Poisson photon-counting model is accurate for optical channels with low received intensity, such as long-range intersatellite optical wireless links. This paper considers the computation of the channel capacity and the design of capacity-approaching, nonuniform signaling for discrete-time Poisson channels in the presence of dark current and underaverage and peak...

    Provided By Optical Society of America

  • White Papers // Dec 2009

    Broadband Hitless Silicon Electro-Optic Switch for On-Chip Optical Networks

    This paper report on the demonstration of a broadband (60 GHz), spectrally hitless, compact (20 ?m x 40 ?m), fast (7 ns) electro-optical switch. The device is composed of two coupled resonant cavities, each with an independently addressable PIN diode. This topology enables operation of the switch without perturbing adjacent...

    Provided By Optical Society of America

  • White Papers // Apr 2009

    Single Port Optical Switching in Integrated Ring Resonators

    Semiconductor ring lasers (SRLs) are attractive components for all-optical signal processing. They typically lase bidirectional at low drive current and unidirectional at high current due to gain suppression between the Competing Clockwise (CW) and counter-clockwise (CCW) modes. This unidirectionality can potentially be utilized for bistable operation by switching between the...

    Provided By Optical Society of America

  • White Papers // Jan 2010

    Experimental Demonstration of Optical Switching and Routing Via Four-Wave Mixing Spatial Shift

    The paper demonstrates the shift characteristics of Four-Wave Mixing (FWM) beam spots which are controlled by the strong laser fields via the large cross-Kerr nonlinearity. The shift distances and directions are determined by the nonlinear dispersions. Based on such spatial displacements of the FWM beams, as well as the probe...

    Provided By Optical Society of America

  • White Papers // Feb 2009

    Virtualizing and Scheduling Optical Network Infrastructure for Emerging IT Services

    Emerging IT services providers which aim at delivering supercomputing power available to the masses over the Internet, rely on high performance IT resources interconnected with ultra-high performance optical networks. To adjust the provisioning of the resources to end-user demand variations, new infrastructure capabilities have to be supported. These capabilities have...

    Provided By Optical Society of America

  • White Papers // Jan 2010

    Point-to-Multipoint VLAN Path Signaling Demonstration on the GMPLS Controlled Ethernet Test Network

    Ethernet has greatly succeeded in Local Area Network (LAN). A simple forwarding scheme of Ethernet facilitated the development of high-speed and cost-effective Ethernet equipments. Ethernet is now expanding from LAN to Wide Area Network (WAN) as a carrier grade transport network. The carrier grade Ethernet will replace legacy transport network...

    Provided By Optical Society of America

  • White Papers // Jan 2010

    Comparison of Static and Dynamic WDM Networks in Terms of Energy Consumption

    Currently, telecommunication networks have been reported to account for 1-10% of the world's energy consumption. Given the ever increasing demand for Internet traffic, this figure is expected to keep growing. As a result, taking into account energy consumption is key in the design of next-generation networks. Core networks are at...

    Provided By Optical Society of America

  • White Papers // Apr 2010

    Transparent High-Data-Rate Optical Transmission Through Broadband Hitless Bypass Switches for Chip-Scale Optical Networks

    Silicon photonics has been realized to provide outstanding performance in very broad range of applications such as short-haul communication, and on-chip global interconnection networks in multi-core microprocessors. The most pertinent advantages of silicon photonics are its large bandwidth, low energy consumption, and small footprint components. Furthermore, silicon photonics provides large...

    Provided By Optical Society of America

  • White Papers // Aug 2010

    Clustering Methods for Hierarchical Traffic Grooming in Large-Scale Mesh WDM Networks

    This paper considers a hierarchical approach for traffic grooming in large multiwavelength networks of a general topology. Inspired by similar concepts in the airline industry, the author decomposes the network into clusters, and selects a hub node in each cluster to groom traffic originating and terminating locally. At the second...

    Provided By Optical Society of America

  • White Papers // Jan 2010

    Cross-Layer Traffic Grooming for Optical Networks With Hybrid Layer-One and Layer-Zero Signal Regeneration

    Traffic grooming is important for optical transport networks. Most of studies in this area have focused on minimizing total network capacity or maximizing total served traffic demand subject to predefined network capacity. When planning lightpath demand, the existing traffic grooming studies often ignored the impairments in the physical layer. However,...

    Provided By Optical Society of America

  • White Papers // Apr 2010

    Broadband All-Optical Modulation in Hydrogenated-Amorphous Silicon Waveguides

    the authors demonstrate broadband all-optical modulation in low loss hydrogenated-amorphous silicon (a-Si:H) waveguides. Significant modulation (~3 dB) occurs with a device of only 15 ?gm without the need for cavity interference effects in stark contrast to an identical crystalline silicon waveguide. the authors attribute the enhanced modulation to the significantly...

    Provided By Optical Society of America

  • White Papers // Jan 2010

    Does Header Length Affect Performance in Optical Burst Switched Networks?

    This paper investigates the impact of non-negligible Header Length (HL) in optical burst switching on blocking probability. The header length is the total delay of a control packet at the controller. he authors first develop a model that explicitly presents the distribution of offset times as a function of the...

    Provided By Optical Society of America

  • White Papers // Jan 2010

    Evaluation of Protection Reconfiguration for Multiple Failures in Optical Networks

    Protection and restoration are important in designing reliable optical networks and have been widely studied in the literature. Most practical studies of high-speed recovery algorithms assume only a single-link or single-node failure model. As networks grow in size and complexity, both the likelihood and the impact of failures increase. In...

    Provided By Optical Society of America

  • White Papers // May 2010

    Adaptive Modulation and Coding for Free-Space Optical Channels

    Adaptive modulation and coding can provide robust and spectrally efficient transmission over terrestrial free-space optical channels. Three adaptive modulation schemes are considered in this paper: variable-rate variable-power adaptation, channel inversion, and truncated channel inversion schemes. It is shown that a simple channel inversion scheme performs comparable to a variablerate variable-power...

    Provided By Optical Society of America

  • White Papers // Oct 2009

    Coded PPM and Multipulse PPM and Iterative Detection for Free-Space Optical Links

    Signal modulation has an important impact on the system performance in optical communication. Two attractive modulation schemes are Pulse Position Modulation (PPM) and Multi Pulse PPM (MPPM), which have the advantage of average energy efficiency and bandwidth efficiency, respectively. An important practical issue is to employ an efficient channel coding...

    Provided By Optical Society of America

  • White Papers // Oct 2009

    Fading Reduction by Aperture Averaging and Spatial Diversity in Optical Wireless Systems

    Atmospheric turbulence can cause significant performance degradation in free-space optical communication systems. It is well known that the effect of turbulence can be reduced by performing aperture averaging and ? or employing spatial diversity at the receiver. In this paper, authors provide a synthesis on the effectiveness of these techniques...

    Provided By Optical Society of America

  • White Papers // Feb 2009

    Integrated Polymer Microprisms for Free Space Optical Beam Deflecting

    Authors demonstrate beam deflection and multiple channel communication in free space optical communications using microprisms integrated directly onto an array of Vertical Cavity Surface Emitting Lasers (VCSELs). The design and fabrication of such a transmitter is presented, and shown to achieve beam deflection of up to 10? in a planar...

    Provided By Optical Society of America

  • White Papers // Apr 2009

    Online Excess Bandwidth Distribution for Ethernet Passive Optical Networks

    Excess bandwidth distribution techniques have recently been proposed to improve the dynamic bandwidth allocation in Ethernet Passive Optical Networks (EPONs). This paper compares existing offline excess bandwidth distribution with conventional limited Interleaved Polling with Adaptive Cycle Time (IPACT-limited) in terms of packet delay performance. This paper identifies the factors that...

    Provided By Optical Society of America

  • White Papers // Nov 2010

    LDPC-Coded Orbital Angular Momentum (OAM) Modulation for Free-Space Optical Communication

    An Orbital Angular Momentum (OAM) based LDPC-coded modulation scheme suitable for use in FSO communication is proposed. They demonstrate that the proposed scheme can operate under strong atmospheric turbulence regime and enable 100 Gb/s optical transmission while employing 10 Gb/s components. Both binary and nonbinary LDPC-coded OAM modulations are studied....

    Provided By Optical Society of America