Yutaka Takita

160 Gbit/s optical 3R-regenerator in a fiber transmission experiment

A fiber-based, wavelength-shift free 3R-regenerating repeater was operated at 160 Gbit/s in a dispersion-managed fiber link for the first time. Error free 160 Gbit/s OTDM transmission over 186 km was demonstrated.

WDM Optical Packet Interconnection using Multi-Gate SOA Switch Architecture for Peta-Flops Ultra-High-Performance Computing Systems

We propose a 100-Tbps-class throughput WDM optical packet interconnection for peta-flops ultra-high-performance computing systems using multi-gate SOA broadcast- and-elect switch architecture. The fundamental result of 6.4Tbps throughput (100Gbps x 64port) WDM optical packet interconnection is obtained.

Transparent wavelength conversion at up to 160Gb/s by using supercontinuum generation in a nonlinear fiber

Wavelength conversion by spectral broadening in a normal dispersion fiber is experimentally demonstrated at 40, 80 and 160Gb/s, for the first time, and bit-rate free operation is confirmed. 2R-regenerating capability is also demonstrated at 160Gb/s.

Label-based path switching and error-free forwarding in a prototype optical burst switching node using a fast 4/spl times/4 optical switch and shared wavelength conversion

We demonstrate for the first time optical burst switching using fast and scalable EO switch and a shared wavelength converter for contention resolution. 3.5 /spl mu/m label routing of variable-length bursts and error-free operation was achieved at 10 Gbps payload.

Demonstration of Deflection Routing With Layer-2 Evaluation at 40 Gb/s in a Three-Node Optical Burst Switching Testbed

We developed an optical burst switching (OBS) network testbed with three nodes, where each node consisted of a fast 5 5 (Pb,La)(Zr,Ti)O optical matrix switch. A newly developed Ether frame media converter was successfully used to evaluate Layer-2 performance of the testbed, with a line rate of 40Gb/s. A dynamic deflection routing scheme for contention resolution is implemented. Error-free switching with 40-Gb/s payload was achieved over the three nodes, promising low frame loss due to dynamic operation. By comparing effects of random collision with and without deflection routing for varying loads, we demonstrate that near-theoretical low frame loss is achievable in fast Layer-2 (Ether frame) transport over OBS networks.

Integrated 8×8 Electro-optic High-speed Switch for Optical Burst Transport Networks

We developed 8 times 8 beam-deflecting optical switch with a switching speed within one microsecond utilizing electro-optic effect of PLZT. A newly-developed radial optical path design and putting-in packaging structure with a monolithic PLC platform were applied.

Optical Burst Switching Router With 40-,10-Gb/s Bit-Rate Transparent Contention Resolution

We report a bit-rate transparent optical burst switching (OBS) router prototype using a fast 5 times 5 PLZT [(Pb,La)(Zr,Ti)O3 ] optical matrix switch. Dynamic switching in a two-wavelength, 2 times 2 OBS switch is demonstrated. Contention resolution using a tunable Mach-Zehnder interferometer wavelength converter for both 40- and 10-Gb/s bursts is demonstrated for the first time. Error-free operation was achieved for both bit rates under the same settings, as required in autonomous networks

Compact photonic gateway for dynamic path control using acousto-optic tunable filter

A compact photonic gateway for wavelength-path control with a simple configuration at low cost was developed. The gateway achieves wavelength-path control by using acousto-optic tunable filters (AOTF). The fabricated four-channel integrated AOTF device exhibits a high performance with regard to polarization-independent characteristics, side-lobe suppression, higher extinction ratio, and narrower bandwidth for 100 GHz spacing. An AOTF subsystem was fabricated by combining an AOTF with the control circuit to exploit the AOTFs high-speed switching to the full and operate it stably for practical use and achieve stable operation of the AOTF. We manufactured the photonic gateway node by assembling the AOTF subsystem with the provisioning control and redundant system.

Multi-hop Transmission with Wavelength Conversion for Collision Resolution in PLZT Matrix Switch-based Optical Burst Switching Node Prototype

Multi-hop cascadibility of a PLZT matrix switch-based optical burst switching node prototype is presented. Using a 50 km recirculating loop setup and a 4times4 matrix switch, more than 10 hop transparency at 10 Gb/s was achieved. Hop-by-hop wavelength conversion for contention resolution and signal reshaping effect was confirmed.

Hub site oriented traffic grooming for mesh OTN/WDM networks

We have proposed a novel traffic grooming method with a relaxed ILP model considering hub site locations. This method showed more than 80% of computation time reduction with maintaining the grooming performance.