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Katsuhisa Taguchi - One of the best experts on this subject based on the ideXlab platform.

  • Field Trial of Long-Reach and High-Splitting λ-Tunable TWDM-PON
    Journal of Lightwave Technology, 2016
    Co-Authors: Katsuhisa Taguchi, Kota Asaka, Masamichi Fujiwara, Shin Kaneko, Tomoaki Yoshida, Yoshikazu Fujita, Hideyuki Iwamura, Masayuki Kashima, Satoshi Furusawa, Masahiro Sarashina
    Abstract:

    This paper presents the world's first field trial of a 40-km reach and over 512-split Symmetric-Rate 40-Gbit/s λ-tunable time and wavelength division multiplexing passive optical network (TWDM-PON) that utilizes our newly developed high-speed λ-tunable optical network unit transceivers and automatic gain controlled semiconductor optical amplifier-based PON extender for repeater and central office use. The upstream signals for C-band and downstream signals for L+-band in our developed λ-tunable TWDM-PON comply with the wavelength plan of ITU-T G.989 series. In a field trial, we successfully demonstRate error free λ-tunable transmission for the 40-km reach and 1024-split (maximum number) Symmetric-Rate 40-Gbit/s λ-tunable TWDM-PON over installed standard single-mode fiber links, and advanced network functions such as dynamic load balancing, incremental system upgrade, optical subscriber unit protection, and OLT equipment power saving are also confirmed.

  • high output power olt onu transceivers for 40 gbit s Symmetric Rate ng pon2 systems
    European Conference on Optical Communication, 2015
    Co-Authors: Kota Asaka, Katsuhisa Taguchi, Ken-ichi Suzuki, Yuki Sakaue, Shunji Kimura, Akihiro Otaka
    Abstract:

    More than +6 dBm output power OLT/ONU transceivers which comply with the wavelength allocation plan of the next-generation passive optical network stange2 (NG-PON2) standard (ITU-T G.989.2) are successfully demonstRated thanks to a newly developed semiconductor optical amplifier (SOA) — integRated transmitter.

  • first field trial of 40 km reach and 1024 split Symmetric Rate 40 gbit s x tunable wdm tdm pon
    Optical Fiber Communication Conference, 2015
    Co-Authors: Katsuhisa Taguchi, Kota Asaka, Masamichi Fujiwara, Shin Kaneko, Tomoaki Yoshida, Yoshikazu Fujita, Hideyuki Iwamura, Masayuki Kashima, Satoshi Furusawa, Masahiro Sarashina
    Abstract:

    We introduce the world's first field trial of a Symmetric-Rate 40-Gbit/s λ-tunable WDM/TDM-PON that uses a high-speed λ-selective ONU TRx and optical extender. 40-km reach and 1024-split λ-switching transmission, and system demonstrations are successfully performed.

  • OFC - First field trial of 40-km reach and 1024-split Symmetric-Rate 40-Gbit/s X-tunable WDM/TDM-PON
    Optical Fiber Communication Conference Post Deadline Papers, 2015
    Co-Authors: Katsuhisa Taguchi, Kota Asaka, Masamichi Fujiwara, Shin Kaneko, Tomoaki Yoshida, Yoshikazu Fujita, Hideyuki Iwamura, Masayuki Kashima, Satoshi Furusawa, Masahiro Sarashina
    Abstract:

    We introduce the world's first field trial of a Symmetric-Rate 40-Gbit/s λ-tunable WDM/TDM-PON that uses a high-speed λ-selective ONU TRx and optical extender. 40-km reach and 1024-split λ-switching transmission, and system demonstrations are successfully performed.

  • High output power OLT/ONU transceivers for 40 Gbit/s Symmetric-Rate NG-PON2 systems
    2015 European Conference on Optical Communication (ECOC), 2015
    Co-Authors: Kota Asaka, Katsuhisa Taguchi, Ken-ichi Suzuki, Yuki Sakaue, Shunji Kimura, Akihiro Otaka
    Abstract:

    More than +6 dBm output power OLT/ONU transceivers which comply with the wavelength allocation plan of the next-generation passive optical network stange2 (NG-PON2) standard (ITU-T G.989.2) are successfully demonstRated thanks to a newly developed semiconductor optical amplifier (SOA) — integRated transmitter.

Masahiro Sarashina - One of the best experts on this subject based on the ideXlab platform.

  • Field Trial of Long-Reach and High-Splitting λ-Tunable TWDM-PON
    Journal of Lightwave Technology, 2016
    Co-Authors: Katsuhisa Taguchi, Kota Asaka, Masamichi Fujiwara, Shin Kaneko, Tomoaki Yoshida, Yoshikazu Fujita, Hideyuki Iwamura, Masayuki Kashima, Satoshi Furusawa, Masahiro Sarashina
    Abstract:

    This paper presents the world's first field trial of a 40-km reach and over 512-split Symmetric-Rate 40-Gbit/s λ-tunable time and wavelength division multiplexing passive optical network (TWDM-PON) that utilizes our newly developed high-speed λ-tunable optical network unit transceivers and automatic gain controlled semiconductor optical amplifier-based PON extender for repeater and central office use. The upstream signals for C-band and downstream signals for L+-band in our developed λ-tunable TWDM-PON comply with the wavelength plan of ITU-T G.989 series. In a field trial, we successfully demonstRate error free λ-tunable transmission for the 40-km reach and 1024-split (maximum number) Symmetric-Rate 40-Gbit/s λ-tunable TWDM-PON over installed standard single-mode fiber links, and advanced network functions such as dynamic load balancing, incremental system upgrade, optical subscriber unit protection, and OLT equipment power saving are also confirmed.

  • first field trial of 40 km reach and 1024 split Symmetric Rate 40 gbit s x tunable wdm tdm pon
    Optical Fiber Communication Conference, 2015
    Co-Authors: Katsuhisa Taguchi, Kota Asaka, Masamichi Fujiwara, Shin Kaneko, Tomoaki Yoshida, Yoshikazu Fujita, Hideyuki Iwamura, Masayuki Kashima, Satoshi Furusawa, Masahiro Sarashina
    Abstract:

    We introduce the world's first field trial of a Symmetric-Rate 40-Gbit/s λ-tunable WDM/TDM-PON that uses a high-speed λ-selective ONU TRx and optical extender. 40-km reach and 1024-split λ-switching transmission, and system demonstrations are successfully performed.

  • OFC - First field trial of 40-km reach and 1024-split Symmetric-Rate 40-Gbit/s X-tunable WDM/TDM-PON
    Optical Fiber Communication Conference Post Deadline Papers, 2015
    Co-Authors: Katsuhisa Taguchi, Kota Asaka, Masamichi Fujiwara, Shin Kaneko, Tomoaki Yoshida, Yoshikazu Fujita, Hideyuki Iwamura, Masayuki Kashima, Satoshi Furusawa, Masahiro Sarashina
    Abstract:

    We introduce the world's first field trial of a Symmetric-Rate 40-Gbit/s λ-tunable WDM/TDM-PON that uses a high-speed λ-selective ONU TRx and optical extender. 40-km reach and 1024-split λ-switching transmission, and system demonstrations are successfully performed.

Masamichi Fujiwara - One of the best experts on this subject based on the ideXlab platform.

  • Field Trial of Long-Reach and High-Splitting λ-Tunable TWDM-PON
    Journal of Lightwave Technology, 2016
    Co-Authors: Katsuhisa Taguchi, Kota Asaka, Masamichi Fujiwara, Shin Kaneko, Tomoaki Yoshida, Yoshikazu Fujita, Hideyuki Iwamura, Masayuki Kashima, Satoshi Furusawa, Masahiro Sarashina
    Abstract:

    This paper presents the world's first field trial of a 40-km reach and over 512-split Symmetric-Rate 40-Gbit/s λ-tunable time and wavelength division multiplexing passive optical network (TWDM-PON) that utilizes our newly developed high-speed λ-tunable optical network unit transceivers and automatic gain controlled semiconductor optical amplifier-based PON extender for repeater and central office use. The upstream signals for C-band and downstream signals for L+-band in our developed λ-tunable TWDM-PON comply with the wavelength plan of ITU-T G.989 series. In a field trial, we successfully demonstRate error free λ-tunable transmission for the 40-km reach and 1024-split (maximum number) Symmetric-Rate 40-Gbit/s λ-tunable TWDM-PON over installed standard single-mode fiber links, and advanced network functions such as dynamic load balancing, incremental system upgrade, optical subscriber unit protection, and OLT equipment power saving are also confirmed.

  • first field trial of 40 km reach and 1024 split Symmetric Rate 40 gbit s x tunable wdm tdm pon
    Optical Fiber Communication Conference, 2015
    Co-Authors: Katsuhisa Taguchi, Kota Asaka, Masamichi Fujiwara, Shin Kaneko, Tomoaki Yoshida, Yoshikazu Fujita, Hideyuki Iwamura, Masayuki Kashima, Satoshi Furusawa, Masahiro Sarashina
    Abstract:

    We introduce the world's first field trial of a Symmetric-Rate 40-Gbit/s λ-tunable WDM/TDM-PON that uses a high-speed λ-selective ONU TRx and optical extender. 40-km reach and 1024-split λ-switching transmission, and system demonstrations are successfully performed.

  • OFC - First field trial of 40-km reach and 1024-split Symmetric-Rate 40-Gbit/s X-tunable WDM/TDM-PON
    Optical Fiber Communication Conference Post Deadline Papers, 2015
    Co-Authors: Katsuhisa Taguchi, Kota Asaka, Masamichi Fujiwara, Shin Kaneko, Tomoaki Yoshida, Yoshikazu Fujita, Hideyuki Iwamura, Masayuki Kashima, Satoshi Furusawa, Masahiro Sarashina
    Abstract:

    We introduce the world's first field trial of a Symmetric-Rate 40-Gbit/s λ-tunable WDM/TDM-PON that uses a high-speed λ-selective ONU TRx and optical extender. 40-km reach and 1024-split λ-switching transmission, and system demonstrations are successfully performed.

  • Field Trial of 100-km Reach Symmetric-Rate 10G-EPON System Using Automatic Level Controlled Burst-Mode SOAs
    Journal of Lightwave Technology, 2013
    Co-Authors: Masamichi Fujiwara, Katsuhisa Taguchi, Takeshi Imai, Ken-ichi Suzuki, Hiroshi Ishii, Naoto Yoshimoto
    Abstract:

    This paper reports the world's first field trial of a 100-km reach Symmetric-Rate ten gigabit Ethernet passive optical network (10G-EPON) system that uses optical-amplifier-based PON repeaters. Semiconductor optical amplifiers (SOAs) are utilized to handle the 10G-EPON wavelength allocation defined in IEEE802.3av; a fast automatic level control technique is applied to cascaded SOAs for upstream amplification to achieve high gain and wide input dynamic range. An electronic dispersion compensation technique is also applied for downstream detection. These techniques support a 79.5-dB loss budget and 100-km reach transmission with 40 km span lengths. In a field trial, we successfully demonstRate bidirectional real-time uncompressed high-definition television signal transmission over installed standard single-mode fiber links.

  • Field trial of 79.5-dB loss budget, 100-km reach 10G-EPON system using ALC burst-mode SOAs and EDC
    OFC NFOEC, 2012
    Co-Authors: Masamichi Fujiwara, Katsuhisa Taguchi, Takeshi Imai, Ken-ichi Suzuki, Hiroshi Ishii, Naoto Yoshimoto
    Abstract:

    This paper reports the world's first field trial of a 100-km reach Symmetric-Rate 10G-EPON that uses optical-amplifier-based PON repeaters; bidirectional real-time uncompressed HDTV signal transmission over installed SMF links with 40-km span length is demonstRated.

Mohammad Ishtiyaq Qureshi - One of the best experts on this subject based on the ideXlab platform.

  • on the partition bound for undirected unicast network information capacity
    arXiv: Information Theory, 2020
    Co-Authors: Mohammad Ishtiyaq Qureshi, Satyajit Thakor
    Abstract:

    One of the important unsolved problems in information theory is the conjecture that network coding has no Rate benefit over routing in undirected unicast networks. Three known bounds on the Symmetric Rate in undirected unicast information networks are the sparsest cut, the LP bound and the partition bound. In this paper, we present three results on the partition bound. We show that the decision version problem of computing the partition bound is NP-complete. We give complete proofs of optimal routing schemes for two classes of networks that attain the partition bound. Recently, the conjecture was proved for a new class of networks and it was shown that all the network instances for which the conjecture is proved previously are elements of this class. We show the existence of a network for which the partition bound is tight, achievable by routing and is not an element of this new class of networks.

  • On the Information Capacity of Layered Undirected Unicast Networks
    IEEE Communications Letters, 2020
    Co-Authors: Mohammad Ishtiyaq Qureshi, Satyajit Thakor
    Abstract:

    An important unsolved conjecture in network coding theory states that network coding has no Rate benefit over routing in undirected unicast networks. Recently, a first non-trivial information-theoretic bound, called partition bound, was characterized for Symmetric Rate in undirected unicast networks, and it was shown that the bound is achievable for two classes of networks by a routing scheme. In this letter, we focus on the problem of characterization of networks for which the partition bound is tight. In particular, we consider layered undirected unicast networks. We show a routing scheme achieving the partition bound for a class of 3-layer networks and thus establish explicit information capacity expression and prove the conjecture for the class of networks. We also show that there exists a 4-layer network for which the partition bound cannot be achieved by an optimal routing scheme.

  • ISIT - On the Partition Bound for Undirected Unicast Network Information Capacity
    2020 IEEE International Symposium on Information Theory (ISIT), 2020
    Co-Authors: Mohammad Ishtiyaq Qureshi, Satyajit Thakor
    Abstract:

    One of the important unsolved problems in information theory is the conjecture that network coding has no Rate benefit over routing in undirected unicast networks. Three known bounds on the Symmetric Rate in undirected unicast information networks are the sparsest cut, the LP bound and the partition bound. In this paper, we present three results on the partition bound. We show that the decision version problem of computing the partition bound is NP-complete. We give complete proofs of optimal routing schemes for two classes of networks that attain the partition bound. Recently, the conjecture was proved for a new class of networks and it was shown that all the network instances for which the conjecture is proved previously are elements of this class. We show the existence of a network for which the partition bound is tight, achievable by routing and is not an element of this new class of networks.

  • undirected unicast network capacity a partition bound
    International Symposium on Information Theory, 2019
    Co-Authors: Satyajit Thakor, Mohammad Ishtiyaq Qureshi
    Abstract:

    In this paper, we present a new technique to obtain upper bounds on undirected unicast network information capacity. Using this technique, we characterize an upper bound, called partition bound, on the Symmetric Rate of information flow in undirected unicast networks and give an algorithm to compute it. Two classes of networks are presented for which the bound is tight and the capacity is achievable by routing thus confirming the undirected unicast conjecture for these classes of networks. We also show that the bound can be loose in general and present an approach to tighten it.

  • ISIT - Undirected Unicast Network Capacity: A Partition Bound
    2019 IEEE International Symposium on Information Theory (ISIT), 2019
    Co-Authors: Satyajit Thakor, Mohammad Ishtiyaq Qureshi
    Abstract:

    In this paper, we present a new technique to obtain upper bounds on undirected unicast network information capacity. Using this technique, we characterize an upper bound, called partition bound, on the Symmetric Rate of information flow in undirected unicast networks and give an algorithm to compute it. Two classes of networks are presented for which the bound is tight and the capacity is achievable by routing thus confirming the undirected unicast conjecture for these classes of networks. We also show that the bound can be loose in general and present an approach to tighten it.

Kota Asaka - One of the best experts on this subject based on the ideXlab platform.

  • Field Trial of Long-Reach and High-Splitting λ-Tunable TWDM-PON
    Journal of Lightwave Technology, 2016
    Co-Authors: Katsuhisa Taguchi, Kota Asaka, Masamichi Fujiwara, Shin Kaneko, Tomoaki Yoshida, Yoshikazu Fujita, Hideyuki Iwamura, Masayuki Kashima, Satoshi Furusawa, Masahiro Sarashina
    Abstract:

    This paper presents the world's first field trial of a 40-km reach and over 512-split Symmetric-Rate 40-Gbit/s λ-tunable time and wavelength division multiplexing passive optical network (TWDM-PON) that utilizes our newly developed high-speed λ-tunable optical network unit transceivers and automatic gain controlled semiconductor optical amplifier-based PON extender for repeater and central office use. The upstream signals for C-band and downstream signals for L+-band in our developed λ-tunable TWDM-PON comply with the wavelength plan of ITU-T G.989 series. In a field trial, we successfully demonstRate error free λ-tunable transmission for the 40-km reach and 1024-split (maximum number) Symmetric-Rate 40-Gbit/s λ-tunable TWDM-PON over installed standard single-mode fiber links, and advanced network functions such as dynamic load balancing, incremental system upgrade, optical subscriber unit protection, and OLT equipment power saving are also confirmed.

  • high output power olt onu transceivers for 40 gbit s Symmetric Rate ng pon2 systems
    European Conference on Optical Communication, 2015
    Co-Authors: Kota Asaka, Katsuhisa Taguchi, Ken-ichi Suzuki, Yuki Sakaue, Shunji Kimura, Akihiro Otaka
    Abstract:

    More than +6 dBm output power OLT/ONU transceivers which comply with the wavelength allocation plan of the next-generation passive optical network stange2 (NG-PON2) standard (ITU-T G.989.2) are successfully demonstRated thanks to a newly developed semiconductor optical amplifier (SOA) — integRated transmitter.

  • first field trial of 40 km reach and 1024 split Symmetric Rate 40 gbit s x tunable wdm tdm pon
    Optical Fiber Communication Conference, 2015
    Co-Authors: Katsuhisa Taguchi, Kota Asaka, Masamichi Fujiwara, Shin Kaneko, Tomoaki Yoshida, Yoshikazu Fujita, Hideyuki Iwamura, Masayuki Kashima, Satoshi Furusawa, Masahiro Sarashina
    Abstract:

    We introduce the world's first field trial of a Symmetric-Rate 40-Gbit/s λ-tunable WDM/TDM-PON that uses a high-speed λ-selective ONU TRx and optical extender. 40-km reach and 1024-split λ-switching transmission, and system demonstrations are successfully performed.

  • OFC - First field trial of 40-km reach and 1024-split Symmetric-Rate 40-Gbit/s X-tunable WDM/TDM-PON
    Optical Fiber Communication Conference Post Deadline Papers, 2015
    Co-Authors: Katsuhisa Taguchi, Kota Asaka, Masamichi Fujiwara, Shin Kaneko, Tomoaki Yoshida, Yoshikazu Fujita, Hideyuki Iwamura, Masayuki Kashima, Satoshi Furusawa, Masahiro Sarashina
    Abstract:

    We introduce the world's first field trial of a Symmetric-Rate 40-Gbit/s λ-tunable WDM/TDM-PON that uses a high-speed λ-selective ONU TRx and optical extender. 40-km reach and 1024-split λ-switching transmission, and system demonstrations are successfully performed.

  • High output power OLT/ONU transceivers for 40 Gbit/s Symmetric-Rate NG-PON2 systems
    2015 European Conference on Optical Communication (ECOC), 2015
    Co-Authors: Kota Asaka, Katsuhisa Taguchi, Ken-ichi Suzuki, Yuki Sakaue, Shunji Kimura, Akihiro Otaka
    Abstract:

    More than +6 dBm output power OLT/ONU transceivers which comply with the wavelength allocation plan of the next-generation passive optical network stange2 (NG-PON2) standard (ITU-T G.989.2) are successfully demonstRated thanks to a newly developed semiconductor optical amplifier (SOA) — integRated transmitter.

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