The Experts below are selected from a list of 4251 Experts worldwide ranked by ideXlab platform

Neda Cvijetic - One of the best experts on this subject based on the ideXlab platform.

  • sdn and openflow for dynamic flex grid optical access and aggregation networks
    Journal of Lightwave Technology, 2014
    Co-Authors: Neda Cvijetic, Akihiro Tanaka, Philip N Ji, Karthik Sethuraman, Shuji Murakami, Ting Wang
    Abstract:

    We propose and discuss the extension of software-defined networking (SDN) and OpenFlow principles to optical access/aggregation networks for dynamic flex-grid wavelength circuit creation. The first experimental demonstration of an OpenFlow1.0-based flex-grid λ-flow architecture for dynamic 150 Mb/s per-cell 4 G Orthogonal Frequency Division Multiple Access (OFDMA) Mobile Backhaul (MBH) overlays onto 10 Gb/s passive optical networks (PON) without optical network unit (ONU)-side optical filtering, amplification, or coherent detection, over 20 km standard single mode fiber (SSMF) with a 1:64 passive split is also detailed. The proposed approach can be attractive for monetizing optical access/aggregation networks via on-demand support for high-speed, low latency, high quality of service (QoS) applications over legacy fiber infrastructure.

  • advanced wireless and optical technologies for small cell Mobile Backhaul with dynamic software defined management
    IEEE Communications Magazine, 2013
    Co-Authors: Dejan Bojic, Neda Cvijetic, Eisaku Sasaki, Ting Wang, Junichiro Kuno, Johannes Lessmann, Stefan Schmid, Hiroyasu Ishii, Shinya Nakamura
    Abstract:

    This article discusses novel wireless and optical technologies to address the radical new challenges of small cell Mobile Backhaul (MBH). Specifically, we examine 60 GHz and 70-80 GHz millimeter-wave technologies for high-capacity last mile and pre-aggregation Backhaul, and orthogonal frequency-division multiple access passive optical networks as the optical technology complement for enabling flexible cost-efficient hybrid Backhaul coverage. Flexible high-capacity hybrid millimeter wave/optical MBH network operation is next verified via network simulations in the context of a demanding, urban small-cell Backhaul application. Finally, a novel software defined networking tool called the Backhaul resource manager is introduced for automated dynamic resource provisioning and capacity-aware path computation that improves fairness, network utilization and end-to-end user quality of experience. The introduction of the novel wireless, optical, and software-defined technologies thus has the potential to truly revolutionize the future MBH network.

  • first openflow based software defined λ flow architecture for flex grid ofdma Mobile Backhaul over passive optical networks with filterless direct detection onus
    Optical Fiber Communication Conference, 2013
    Co-Authors: Neda Cvijetic, Akihiro Tanaka, Karthik Sethuraman, Shuji Murakami, Ting Wang
    Abstract:

    We demonstrate the first software-defined OpenFlow1.0-based flex-grid λ-flow architecture enabling 150Mb/s per-cell OFDMA MBH overlays onto bidirectional 10Gb/s PON, without any ONU-side optical filtering, amplification, or coherent detection over 20km SSMF and 1:64 passive split.

  • 4 g Mobile Backhaul over ofdma tdma pon to 200 cell sites per fiber with 10gb s upstream burst mode operation enabling 1ms transmission latency
    Optical Fiber Communication Conference, 2012
    Co-Authors: Neda Cvijetic, Ezra Ip, Milorad Cvijetic, Akihiro Tanaka, Yuekai Huang, Yin Shao, Ting Wang
    Abstract:

    The first downstream/upstream OFDMA/TDMA-PON achieving >100Mb/s per-cell Mobile Backhaul and burst-mode operation using off-the-shelf APDs is demonstrated over 1.645km for 200 cells. The new approach enables <1ms transmission latency and 3dB burst-mode dynamic range tolerance.

  • Terabit Optical Access Networks Based on WDM-OFDMA-PON
    Journal of Lightwave Technology, 2012
    Co-Authors: Neda Cvijetic, Huang Ming-fang, Huang Yue-kai, Ezra Ip, Milorad Cvijetic, Wang Ting
    Abstract:

    Next-generation optical access networks are envisioned to evolve into a converged, high-speed, multiservice platform supporting residential, business, Mobile Backhaul, and special purpose applications. Moreover, bandwidth demand projections suggest that terabit aggregate capacity may need to be reached in such next-generation passive optical networks (PON). To satisfy these requirements while leveraging the large investments made in existing fiber plants, a wavelength division multiplexed (WDM)-based long-reach PON architecture combined with a multiple access technology that features a passive last-mile split, large per-λ speeds, and statistical bandwidth multiplexing can be exploited. In this paper, the first terabit PON based on hybrid WDM orthogonal frequency division multiple access (OFDMA) technology is proposed and experimentally verified. To enable high-speed, long-reach transmission with simplified optical network unit (ONU)-side digital signal processing, multiband OFDMA with ONU-side sub-band selectivity is proposed. Design challenges and tradeoffs between analog and digital domain sub-band combining and selection are also discussed. Finally, the experimental setup and results of the first 1.2 Tb/s (1 Tb/s after overhead) symmetric WDM-OFDMA-PON over 90 km straight single-mode fiber and 1:32 passive split, featuring multiband OFDMA, digitally selective ONUs, and a coherent-receiver OLT are presented and analyzed. By supporting up to 800 ONUs with 1.25/10 Gb/s guaranteed/peak rates and exhibiting a record rate-distance product achieved in long-reach PON, the demonstrated architecture may be viewed as promising for future converged terabit optical metro/access.

Ting Wang - One of the best experts on this subject based on the ideXlab platform.

  • sdn and openflow for dynamic flex grid optical access and aggregation networks
    Journal of Lightwave Technology, 2014
    Co-Authors: Neda Cvijetic, Akihiro Tanaka, Philip N Ji, Karthik Sethuraman, Shuji Murakami, Ting Wang
    Abstract:

    We propose and discuss the extension of software-defined networking (SDN) and OpenFlow principles to optical access/aggregation networks for dynamic flex-grid wavelength circuit creation. The first experimental demonstration of an OpenFlow1.0-based flex-grid λ-flow architecture for dynamic 150 Mb/s per-cell 4 G Orthogonal Frequency Division Multiple Access (OFDMA) Mobile Backhaul (MBH) overlays onto 10 Gb/s passive optical networks (PON) without optical network unit (ONU)-side optical filtering, amplification, or coherent detection, over 20 km standard single mode fiber (SSMF) with a 1:64 passive split is also detailed. The proposed approach can be attractive for monetizing optical access/aggregation networks via on-demand support for high-speed, low latency, high quality of service (QoS) applications over legacy fiber infrastructure.

  • advanced wireless and optical technologies for small cell Mobile Backhaul with dynamic software defined management
    IEEE Communications Magazine, 2013
    Co-Authors: Dejan Bojic, Neda Cvijetic, Eisaku Sasaki, Ting Wang, Junichiro Kuno, Johannes Lessmann, Stefan Schmid, Hiroyasu Ishii, Shinya Nakamura
    Abstract:

    This article discusses novel wireless and optical technologies to address the radical new challenges of small cell Mobile Backhaul (MBH). Specifically, we examine 60 GHz and 70-80 GHz millimeter-wave technologies for high-capacity last mile and pre-aggregation Backhaul, and orthogonal frequency-division multiple access passive optical networks as the optical technology complement for enabling flexible cost-efficient hybrid Backhaul coverage. Flexible high-capacity hybrid millimeter wave/optical MBH network operation is next verified via network simulations in the context of a demanding, urban small-cell Backhaul application. Finally, a novel software defined networking tool called the Backhaul resource manager is introduced for automated dynamic resource provisioning and capacity-aware path computation that improves fairness, network utilization and end-to-end user quality of experience. The introduction of the novel wireless, optical, and software-defined technologies thus has the potential to truly revolutionize the future MBH network.

  • first openflow based software defined λ flow architecture for flex grid ofdma Mobile Backhaul over passive optical networks with filterless direct detection onus
    Optical Fiber Communication Conference, 2013
    Co-Authors: Neda Cvijetic, Akihiro Tanaka, Karthik Sethuraman, Shuji Murakami, Ting Wang
    Abstract:

    We demonstrate the first software-defined OpenFlow1.0-based flex-grid λ-flow architecture enabling 150Mb/s per-cell OFDMA MBH overlays onto bidirectional 10Gb/s PON, without any ONU-side optical filtering, amplification, or coherent detection over 20km SSMF and 1:64 passive split.

  • 4 g Mobile Backhaul over ofdma tdma pon to 200 cell sites per fiber with 10gb s upstream burst mode operation enabling 1ms transmission latency
    Optical Fiber Communication Conference, 2012
    Co-Authors: Neda Cvijetic, Ezra Ip, Milorad Cvijetic, Akihiro Tanaka, Yuekai Huang, Yin Shao, Ting Wang
    Abstract:

    The first downstream/upstream OFDMA/TDMA-PON achieving >100Mb/s per-cell Mobile Backhaul and burst-mode operation using off-the-shelf APDs is demonstrated over 1.645km for 200 cells. The new approach enables <1ms transmission latency and 3dB burst-mode dynamic range tolerance.

Zhenhua Feng - One of the best experts on this subject based on the ideXlab platform.

  • multicore fiber enabled wsdm optical access network with centralized carrier delivery and rsoa based adaptive modulation
    IEEE Photonics Journal, 2015
    Co-Authors: Zhenhua Feng, Ming Tang, Lin Gan, Ruoxu Wang, Rui Lin, Lei Deng, Weijun Tong, Shengya Long, Lei Zhang, Hongyan Zhou
    Abstract:

    We proposed and experimentally demonstrated a wavelength-space division multiplexing (WSDM) optical access network architecture with centralized optical carrier delivery utilizing multicore fibers (MCFs) and adaptive modulation based on reflective semiconductor amplifier (RSOA). In our experiment, five of the outer cores are used for undirectional downstream (DS) transmission only, whereas the remaining outer core is utilized as a dedicated channel to transmit upstream (US) signals. Optical carriers for US are delivered from the optical line terminal (OLT) to the optical network unit (ONU) via the inner core and then transmitted back to the OLT after amplification and modulation by the RSOA in the colorless ONU side. The Mobile Backhaul (MB) service is also supported by the inner core. Wavelengths used in US transmission should be different from that of the MB in order to avoid the Rayleigh backscattering effect in bidirectional transmission. With quadrature phase-shift keying--orthogonal frequency-division multiplexing (QPSK-OFDM) modulation format, the aggregation DS capacity reaches 250 Gb/s using five outer cores and ten wavelengths, and it can be further scaled to 1 Tb/s using 20 wavelengths modulated with 16 QAM-OFDM. For US transmission, 2.5 Gb/s QPSK-OFDM transmission can be achieved just using a low-bandwidth RSOA, and adaptive modulation is applied to the RSOA to further enhance the US data rate to 3.12 Gb/s. As an emulation of high-speed MB transmission, 48 Gb/s in-phase and quadrature (IQ) modulated popularization division multiplexing (PDM)-QPSK signal is transmitted in the inner core of MCF and coherently detected in the OLT side. Both DS and US optical signals exhibit acceptable performance with sufficient power budget.

  • experimental demonstration of large capacity wsdm optical access network with multicore fibers and advanced modulation formats
    Optics Express, 2015
    Co-Authors: Zhenhua Feng, Ming Tang, Lei Deng, Weijun Tong, Shuang Liu, Perry Ping Shum
    Abstract:

    Towards the next generation optical access network supporting large capacity data transmission to enormous number of users covering a wider area, we proposed a hybrid wavelength-space division multiplexing (WSDM) optical access network architecture utilizing multicore fibers with advanced modulation formats. As a proof of concept, we experimentally demonstrated a WSDM optical access network with duplex transmission using our developed and fabricated multicore (7-core) fibers with 58.7km distance. As a cost-effective modulation scheme for access network, the optical OFDM-QPSK signal has been intensity modulated on the downstream transmission in the optical line terminal (OLT) and it was directly detected in the optical network unit (ONU) after MCF transmission. 10 wavelengths with 25GHz channel spacing from an optical comb generator are employed and each wavelength is loaded with 5Gb/s OFDM-QPSK signal. After amplification, power splitting, and fan-in multiplexer, 10-wavelength downstream signal was injected into six outer layer cores simultaneously and the aggregation downstream capacity reaches 300 Gb/s. −16 dBm sensitivity has been achieved for 3.8 × 10−3 bit error ratio (BER) with 7% Forward Error Correction (FEC) limit for all wavelengths in every core. Upstream signal from ONU side has also been generated and the bidirectional transmission in the same core causes negligible performance degradation to the downstream signal. As a universal platform for wired/wireless data access, our proposed architecture provides additional dimension for high speed Mobile signal transmission and we hence demonstrated an upstream delivery of 20Gb/s per wavelength with QPSK modulation formats using the inner core of MCF emulating a Mobile Backhaul service. The IQ modulated data was coherently detected in the OLT side. −19 dBm sensitivity has been achieved under the FEC limit and more than 18 dB power budget is guaranteed.

Lin Cheng - One of the best experts on this subject based on the ideXlab platform.

  • fiber wireless integrated Mobile Backhaul network based on a hybrid millimeter wave and free space optics architecture with an adaptive diversity combining technique
    Optics Letters, 2016
    Co-Authors: Junwen Zhang, Jing Wang, Lin Cheng
    Abstract:

    We propose and experimentally demonstrate a novel fiber–wireless integrated Mobile Backhaul network based on a hybrid millimeter-wave (MMW) and free-space-optics (FSO) architecture using an adaptive combining technique. Both 60 GHz MMW and FSO links are demonstrated and fully integrated with optical fibers in a scalable and cost-effective Backhaul system setup. Joint signal processing with an adaptive diversity combining technique (ADCT) is utilized at the receiver side based on a maximum ratio combining algorithm. Mobile Backhaul transportation of 4-Gb/s 16 quadrature amplitude modulation frequency-division multiplexing (QAM-OFDM) data is experimentally demonstrated and tested under various weather conditions synthesized in the lab. Performance improvement in terms of reduced error vector magnitude (EVM) and enhanced link reliability are validated under fog, rain, and turbulence conditions.

  • a novel multi service small cell cloud radio access network for Mobile Backhaul and computing based on radio over fiber technologies
    Journal of Lightwave Technology, 2013
    Co-Authors: Cheng Liu, Jing Wang, Lin Cheng, Liang Zhang, Ming Zhu, Geekung Chang
    Abstract:

    Small-cell systems based on cloud radio access network (cloud-RAN) architecture have been proposed as promising solutions to meet the capacity demand of the future wireless access networks in a cost-effective and power-efficient way. High-speed and scalable Backhaul links between the centralized baseband processing units (BBUs) and the remote antenna units (RAUs) are very important to support the small-cell cloud-RAN. Conventionally, digital baseband I/Q samples are transmitted in the cloud-RAN Backhaul, which puts stringent requirements on Backhaul bandwidth, latency, and jitter. In this paper, we propose a novel multi-service small-cell wireless access architecture based on radio-over-fiber technologies (cloud-RoF access network). By utilizing analog radio frequency (RF) signal transmission in the optical Backhaul links, high-speed data transmission can be achieved with highly simplified RAU design. In addition, by combing RoF with optical wavelength division multiplexing (WDM) techniques, multiple bands, multiple services and multiple operators can coexist in a shared optical infrastructure without interference. Two-operator coexistence in a shared small-cell cloud-RoF access network is demonstrated in an in-building testbed by using off-the-shelf optoelectronic components and commercialized WiMAX base stations and clients. In addition, the feasibility of delivering both conventional wireless services and future-proof millimeter-wave services is also demonstrated in the proposed multi-service small-cell cloud-RoF access system.

Frank Effenberger - One of the best experts on this subject based on the ideXlab platform.

  • emerging optical access network technologies for 5g wireless invited
    Journal of Optical Communications and Networking, 2016
    Co-Authors: Xiang Liu, Frank Effenberger
    Abstract:

    With the advancement of radio access networks, more and more Mobile data content needs to be transported by optical networks. Mobile fronthaul is an important network segment that connects centralized baseband units (BBUs) with remote radio units in cloud radio access networks (C-RANs). It enables advanced wireless technologies such as coordinated multipoint and massive multiple-input multiple-output. Mobile Backhaul, on the other hand, connects BBUs with core networks to transport the baseband data streams to their respective destinations. Optical access networks are well positioned to meet the first optical communication demands of C-RANs. To better address the stringent requirements of future generations of wireless networks, such as the fifth-generation (5G) wireless, optical access networks need to be improved and enhanced. In this paper, we review emerging optical access network technologies that aim to support 5G wireless with high capacity, low latency, and low cost and power per bit. Advances in high-capacity passive optical networks (PONs), such as 100  Gbit/s PON, will be reviewed. Among the topics discussed are advanced modulation and detection techniques, digital signal processing tailored for optical access networks, and efficient Mobile fronthaul techniques. We also discuss the need for coordination between RAN and PON to simplify the overall network, reduce the network latency, and improve the network cost efficiency and power efficiency.