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Masahiko Fujiwara

dblp:95/2616 · DBLP profile ↗
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2ranked-venue papers
0as first author
0since 2021 · last 1998
—ORCID · none

Domains — the database's venue-derived domains; a paper can count in several

Computer networks · 2

Expertise — from the expertise taxonomy: the topics of the expert's papers under the CCF categories. A weight counts papers with recency: 1 for a paper about the topic, 0.3 when the topic is its context, halved every five years.

Computer networks
2 papers
Optical networks · 34% Datacenter networks · 25% Network management and operations · 25%

Topics — the 6 heaviest of 7, each with the papers that count most for it

TopicWeightPapersLastEvidence papers
Datacenter networks › reconfigurable datacenter network
hitless reconfiguration		 0.011998
Optical cross-connect system incorporated with newly developed operation and management system · IEEE J. Sel. Areas Commun. 1998
Network management and operations
network restoration		 0.011998
Optical cross-connect system incorporated with newly developed operation and management system · IEEE J. Sel. Areas Commun. 1998
Optical networks › optical switching
optical cross-connect		 0.011998
Optical cross-connect system incorporated with newly developed operation and management system · IEEE J. Sel. Areas Commun. 1998
Physical-layer communications › multiplexing
frequency-division multiplexing		 0.011990
Frequency Separation Locking and Synchronization for FDM Optical Sources Using Widely Frequency Tunable Laser Diodes · IEEE J. Sel. Areas Commun. 1990
Physical-layer communications › synchronization
frequency synchronization		 0.011990
Frequency Separation Locking and Synchronization for FDM Optical Sources Using Widely Frequency Tunable Laser Diodes · IEEE J. Sel. Areas Commun. 1990
Optical networks › photonic devices
tunable lasers		 0.011990
Frequency Separation Locking and Synchronization for FDM Optical Sources Using Widely Frequency Tunable Laser Diodes · IEEE J. Sel. Areas Commun. 1990

Methods — techniques the papers use, named apart from their topics

photonic switching · 0.0linbo3 switch matrix · 0.0reference pulse method · 0.0
YearPublicationVenuePosition
1998 Optical cross-connect system incorporated with newly developed operation and management system
abstract
The optical cross-connect (OXC) system described in this paper increases the operation flexibility and reliability of the trunk-line optical networks used for data communication. It features an OXC node comprised of a photonic switching network and a conventional electric switching network that are connected hierarchically. The operation and management scheme proposed for this OXC system uses the concept of an optical path and an optical section. The OXC system allows hitless network reconfiguration by switching the photonic switches gradually and without interference effects. An experimental OXC network showed that a broken optical path is restored, by rerouting, within 50 ms. Experiments using a LiNbO/sub 3/ 8/spl times/8 photonic switch matrix also showed that the OXC system provides photonic hitless switching. These results confirm the feasibility of flexibly reconfigurable and fast-restorable OXC systems.
Tatsuya Shiragaki, Naoya Henmi, Tomoaki Kato, Masahiko Fujiwara, Masatoshi Misono, Takahiro Shiozawa, Shuji Suzuki
 IEEE J. Sel. Areas Commun.4
1990 Frequency Separation Locking and Synchronization for FDM Optical Sources Using Widely Frequency Tunable Laser Diodes
abstract
A laser diode (LD) frequency separation locking method (called the reference pulse method) is proposed. This method has advantageous features for frequency division multiplexing (FDM) networks from the viewpoint of frequency separation stability with a strict frequency separation standard, modulation format independence, controllability over a large number of LDs, and frequency synchronization capability. Frequency locking experiments, using four and ten controlled LDs, confirmed that the control system using the method can stabilize frequency spacing for more than 100 LDs. The frequency fluctuation is suppressed to less than 10 MHz. Frequency synchronization, utilizing the reference pulse method, is proposed and demonstrated experimentally for two controlled LD groups, each consisting of three LDs. Frequency discrepancy between two LD groups was only 2.7% of the frequency separation. Required frequency-swept light power and controlled LD power at the detector input for frequency synchronization indicate that more than 50000 LD groups within a 10 km area, each having 100 LDs, can be synchronized simultaneously.>
Naoki Shimosaka, Kazuhisa Kaede, Masahiko Fujiwara, Shuntaro Yamazaki, Shigeru Murata, Makoto Nishio
 IEEE J. Sel. Areas Commun.3