Fujitsu Corporation

Motoyoshi Sekiya

Inwoong Kim

Paparao Palacharla

Olga I Vassilieva

Xi Wang

George Ishikawa

Qiong Zhang

Hiroshi Onaka

Jeng-Yuan Yang

Hiroki Ooi

Hideyuki Miyata

Hiroaki Tomofuji

Youichi Akasaka

Ryosuke Goto

Kazue Otsuka

Hiroshi Nishimoto

Satoru Okano

Tetsuya Kiyonaga

Kazuo Yamane

Takuji Maeda

Takehiro Fujita

Takuya Miyashita

Setsuo Misaizu

Toru Katagiri

Martin Bouda

Takeshi Sakamoto

Takashi Toyomaki

Makoto Murakami

Qingya She

Kazue Okazaki

Mitsuharu Noda

Chengyi Gao

Yoshitaka Shimura

Satoshi Imai

Yasunori Nagakubo

Taizo Maeda

Yoichi Akasaka

Hidezumi Natori

Kaori Odate

Takehito Okeno

Takeshi Hoshida

Takafumi Terahara

Kentaro Nakamura

Tetsuya Yamada

Kazuyuki Tajima

Yutaka Takita

Tomohiro Hashiguchi

Yoshihito Onoda

Kimio Uekama

Nobuaki Sato

Yasuko Nozu

Weisheng Xie

Chihiro Ohshima

Norio Nagase

Yoshinori Ohkuma

Keisuke Imai

Tomoyuki Otsuka

Yusaku Yamamoto

Rikiya Watanabe

Takashi Kamada

Hiroshi Kuwahara

Paparao Palacharia

Yuuichi Kawahata

Hideto Saito

An apparatus serves as a node device included in a distributed data sharing network, and shares, by using a blockchain, a piece of event information related to an event generated in a terminal, among node devices included in the distributed data sharing network, where the blockchain is a continuously growing list of blocks which are linked and secured using cryptography. The apparatus generates a piece of event data including the piece of event information related to the event, and causes the generated piece of event data to be stored in one of the node devices included in the distributed data sharing network.

Apparatus and method to perform secure data sharing in a distributed network by using a blockchain

An edge server disposed on an edge of a cloud network, includes: a processor, wherein when encryption key information relating to a terminal which requests a connection to the edge server and the encryption key information generated before the request, is included in shared information shared between a cloud server and another edge server in the cloud network, the processor is configured to start encryption communication with the terminal using the encryption key information of the shared information.

Edge server, encryption communication control method thereof, and terminal

Methods and systems enable amplifying optical signals using a Bragg reflection waveguide (BRW) having second order optical nonlinearity to generate an optical pump by injection locking. The BRW may also be used for parametric amplification of optical signals using the optical pump. Feedback phase-power control may be performed to maximize output power.

Harmonic generation and phase sensitive amplification using a bragg reflection waveguide

A method and system for implementing a network service computation system uses distributed graph processing at a plurality of network controllers corresponding to a plurality of network domains. Each network controller may manage and maintain a network graph for its respective network domain. Each network controller many communicate with nodes (or vertices) in its respective network domain, while the network controllers may communicate with each other for path discovery and computation purposes.

Network service computation system

Methods and systems may estimate nonlinear penalties for optical paths using spectral inversion in optical transport networks. Certain values of nonlinear transfer functions for nonlinear penalty estimation may be pre-calculated for optical paths between given nodes. When an optical path computation for using spectral inversion between a given source node and a given destination node is desired, the pre-calculated values may be concatenated for improved computational efficiency.

Nonlinear penalty estimation using spectral inversion in optical transport networks

Methods and systems for amplifying optical signals include generating idler signals for input signals using an optical pump at a first Bragg reflection waveguide (BRW) having second order optical nonlinearity. Phase and amplitude regulation is performed using the output from the first BRW. Optical power monitoring of the input signals may be used for power equalization. The phase-sensitive amplified signal is generated at a second BRW using the optical pump. Optical power monitoring of the input signals may be used for power equalization.

Low-noise optical phase sensitive amplifier using a semiconductor nonlinear optical device

Object-oriented network virtualization may involve creating and operating virtual network objects (VNO) using a software-programmed networking operating system (SPN OS). A VNO may be a complete representation of a virtual network service provided under the SPN OS. A VNO may have a unique identity and properties, along with an internal set of methods for executing functionality encapsulated by the VNO. A VNO may exhibit persistence and autonomous control to enable improved virtual network services.

Object-oriented network virtualization

A method and system for amplifying optical signals includes generating idler signals for input signals using an optical pump at a first non-linear element (NLE). An intermediate stage including a Raman amplifier performs pump amplification using the output from the first NLE along a single optical path. Optical power monitoring of the input signals may be used for power equalization. The intermediate stage may include a wavelength selective switch for a certain degree of phase modulation. The phase-sensitive amplified signal is generated at a second NLE using the optical pump. Optical power monitoring of the input signals may be used for power equalization and other control functions to achieve low-noise operation.

Optical phase-sensitive amplifier with raman amplifier intermediate stage

Methods and systems for superchannel power pre-emphasis may adjust power levels of selected subcarriers of the superchannel. The power pre-emphasis may be performed at a transmission stage using a laser source, a variable optical attenuator, or a wavelength selective switch. The power pre-emphasis may be performed in-line at a reconfigurable optical add-drop multiplexer node. The power pre-emphasis may be performed using feedback control based on a receiver output. The power pre-emphasis may be performed using feedforward control based on optical path computations.

Methods and systems for superchannel power pre-emphasis

Methods and systems for superchannel subcarrier monitoring using amplitude modulated (AM) tones include modulating an optical subcarrier of a superchannel with a first frequency that is chosen to be substantially smaller than a baud rate for data modulated onto the optical subcarrier. Certain pairs of subcarriers in the superchannel may be modulated with AM tones having a common frequency with complementary phase for power equalization. Then, downstream detection and monitoring of the optical subcarrier may be performed based on demodulation of the first frequency. Each optical subcarrier in the superchannel may be modulated using a respectively unique combination of AM tone and phase.

Methods and systems for superchannel subcarrier monitoring using amplitude modulated tones

Optical transceiver sharing methods may be based on different ROADM node architectures for shared restoration in flexible grid optical networks. A ROADM node architecture with a pool of transceivers may improve transceiver utilization for backup optical paths, compared to a conventional ROADM node architecture. Sharing of transceivers in the pool for working and backup optical paths may further improve transceiver utilization. The methods disclosed herein may be used for multiple bit rates and different modulation formats.

Efficient utilization of transceivers for shared restoration in flexible grid optical networks

Methods and systems for superchannel subcarrier monitoring using frequency modulated (FM) tones includes frequency modulating an optical subcarrier of a superchannel with a first frequency that is unique to the optical subcarrier and is chosen to be smaller than an optical transmission frequency for carrier data modulated onto the optical subcarrier. Then, downstream detection and monitoring of the optical subcarrier may be performed based on demodulation of the first frequency. Each optical subcarrier in the superchannel may be modulated using a respectively unique FM tone.

Methods and systems for superchannel subcarrier monitoring using frequency modulation tones

Methods and systems are provided for optical signal transmission using span-wise spectrum management. The method includes transmitting a first optical signal at a first wavelength by a control system. The first optical signal has a first optical path distance. The method further includes determining a first guard band requirement for the first optical signal, and transmitting a second optical signal by the control system. The second optical signal has a second optical path distance. The method includes determining a second guard band requirement for the second optical signal, and placing the second optical signal spectrally adjacent to the first optical signal by selecting a second wavelength. The second wavelength is selected to satisfy the first and second guard band requirements.

Span-wise spectrum management system and method

Methods and systems for superchannel power pre-emphasis based on transmission criteria may determine a guardband used when transmitting multiple superchannels over an optical transport network. The guardband values may depend on various transmission criteria, such as a reach distance for the superchannels and a number of reconfigurable add-drop multiplexer nodes over a given optical path. An amount of power pre-emphasis for each superchannel may then be determined based on the actual guardband values used. Certain values used for superchannel power pre-emphasis based on transmission criteria may be pre-calculated and stored in advance.

Superchannel power pre-emphasis based on transmission criteria

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Richardson, TX, United States of America

Motoyoshi Sekiya