Satoshi Kuroyanagi

A polarization-controlled free-space photonic switch based on a PI-LOSS switch

We propose a polarization-controlled free-space photonic switch based on a PI-LOSS switch that has similar insertion loss and lower crosstalk compared to the conventional crossbar switch. We describe a multistage switching network with cross-connected PI-LOSS switch modules that is easier to control and smaller than other strictly nonblocking switch structures.<<ETX>>

A study on high speed data communication system using ATM

The authors discuss different ways of offering connectionless service in asynchronous transfer mode (ATM) networks. They examine two alternatives for offering connectionless communication. One is the indirect offering method and the other is the direct method. The layout and configuration of CLSF (connectionless service function) in the network that are required by the direct offering method are examined. An arrangement of CLSF in the network is proposed. The elements of CLSF and the allocation of CLSF functions on the ATM switching system are considered. Based on these discussions, the architecture of the CLSF is proposed using cell-based processing, instead of message-based processing.<<ETX>>

Photonic ATM.Switching Network

This paper proposes a photonic ATM switching network using multi-input optical buffer memory based on wavelength division switching.

Optical path restoration schemes and cross-connect architectures for photonic transport networks

An optical path cross-connect (OPXC) system is an essential component for creating photonic transport networks. This paper classifies various schemes used to restore link failures in optical path networks according to restoration methods and rerouting location. We then describe the common OPXC structure and their required functions as related to each restoration scheme. Next, we evaluate the number of optical fibers required in these restoration schemes when using a VWP (virtual wavelength path) network model with a single link failure. Finally, this paper presents an OPXC node architecture based on a restoration scheme which can reduce the total number of fibers the most. The OPXC node, which accommodates 64 optical paths and uses our 8/spl times/8 PI-LOSS (Path-independent Insertion LOSS) switches, will then be evaluated in terms of the signal-to-noise ratio (SNR) and coherent crosstalk.

Optical cross-connect architecture using free-space optical switches based on PI-LOSS topology

An optical cross-connect (OXC) system is an essential ingredient needed to create an optical transport network for B-ISDN. We propose an OXC architecture, incorporating failure restoration based on reserved wavelengths, which consists of a routing block and bypass block. We compare the number of required optical devices in our structure with a conventional structure. We also propose a polarization controlled free-space switch based on path-independent insertion loss (PI-LOSS) topology, adopt it to the routing block, and demonstrate a 4/spl times/4 prototype free-space switch.

Two-stage matrix wavelength-division photonic switching network

The wavelength-division switching network we propose for photonic switching systems to reduce the optical device count consists of a pair of cascaded switch modules and features tunable wavelength filtering and conversion techniques.