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In this paper, we describe an autonomous distributed control system that we have been developing for an optical packet and circuit integrated network, and we experimentally evaluate its performance. Colored (i.e., multi-wavelength) optical packet-switched links transfer both control signals for circuit switching (e.g., signaling and routing) and best-effort(More)
Previous analytic approaches for all-optical networks have only allowed a random wavelength assignment policy in spite of the fact that network performance can be improved by other wavelength assignment policies such as first-fit wavelength assignment. In this paper, we develop an approximate analytic method to allow flexible wavelength assignment policies(More)
We developed, for the first time to our knowledge, a 640-Gbit/s/port optical packet switch prototype consisting of multiple optical label processors, polarization-independent plomb lanthanum zirconate titanate waveguide optical switches, optical fiber-delay-line buffers, and a parallel pipeline buffer manager. We achieved the error-free switching and(More)
It is pragmatically important to know the comparative prognoses of bipolar, unipolar and subthreshold depressions after they present to clinical attention. Previous studies focusing on bipolar and/or unipolar depressions have questionable generalizability because of overrepresentation of inpatients and/or refractory patients, and no study has yet focused on(More)
We develop a method of high-speed buffer management for output-buffered photonic packet switches. The use of optical fiber delay lines is a promising solution to constructing optical buffers. The buffer manager determines packet delays in the fiber delay line buffer before the packets arrive at the buffer. We propose a buffer management method based on a(More)
It is true that in all-optical networks, network performance can be improved by wavelength conversion. However, the switching node with wavelength conversion capability is still costly, and the number of such nodes should be limited in the network. In this paper, a performance optimization problem is treated in all-optical networks. We propose a heuristic(More)
  • Hiroaki Harai
  • 2013
An optical packet and circuit integrated (OPCI) network provides both high-speed, inexpensive services and deterministic-delay, low-data-loss services according to the users' usage scenarios, from the viewpoint of end users. From the viewpoint of network service providers, this network provides large switching capacity with low energy consumption, high(More)