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Photonic network group
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Research topics
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High-speed photonic network systems
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Photonic routing based on WDM information
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Photonic routing system with all optical processing
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High-speed photonic routing protocol
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Optical integrated-circuits for signal processing in networks
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Optical burst switching protocol
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Optical buffering systems
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Format conversion system for optical packet
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High-speed all-optical switch using saturable absorption in graphene
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Optical sensing using fiber sensing element and waveguide-type sensing device
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Optical communication system using optical orbital angular momentum (OAM)
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<Summary>
IP traffic has been increasing rapidly. Photonic networks are expected
to provide broad-band high-speed networking using optical-information processing.
As fundamental technologies to realize such photonic networks, we have
been studying broad-band photonic network based on dense-wavelength-division-multiplexing
(DWDM) and high-speed photonic routing systems, in particular, all-optical
packet routing systems and optical burst switching systems.
An example of photonic router configuration and our research topics
<Wavelength-selective all-optical switching circuit>
In photonic networks, optical switching controlled by an optical signal
is expected to realize effective switching of optical packets. In particular,
wavelength-selectivity is an important factor for effective processing
of optical WDM packets. We have proposed a switching circuit using wavelength-selective
amplification.
Wavelength-selective switch using amplitude control with wavelength-selective
Raman amplifiers. A computer simulation by the beam propagation method
is shown.
<Optical circuit for optical label recognition>
High-speed routing with optical labels is an promising technology in photonic
networks. In the routing nodes, label processing such as label extraction,
recognition and swapping is the fundamental functions. We have studied
various methods to form optical integrated circuits for label processing
for the optical labels. As examples, we have proposed self-routing circuit
consisting of SOAs (semiconductor optical amplifiers) and optical circuits
consisting of parallel acousto-optic switches.
Self-routing circuit for all-optical label recognition consisting of optical
switches
<All-optical format converion for flexible networking>
Format conversion is required in future flexible photonic networks.
Bandwidth of optical packets can be controlled flexibly according to the network link situations. We have studied all-optical formation conversion systems.
Study of all-optical format conversion
<Experiment of light control>
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