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Journals and Conferences
The authors report the realization of an extremely high receiver sensitivity at 10 Gb/s by using an erbium doped fiber (EDF) preamplifier pumped with a 0.98 mu m laser diode. The obtained EDF input sensitivity is -37.2 dBm (147 photons/bit). In addition, the importance of minimizing reflection from amplifier fiber ends is shown.<<ETX>>
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… (More)
A novel data format-free bit-by-bit monitoring method for survivable optical transport networks is proposed. BER evaluation with comparison of BERT and BIP-8 measurement indicates that proposed method has the same capability of SDH/SONET monitoring.
We propose an implementation of a terabits-per-second crossbar-equivalent switch-fabric for packet-switching networks. It consists of switch-modules employing semiconductor optical amplifier gates (SOAGs), arrayed waveguide grating routers, and multiple wavelength-channels. It offers large modularity and a small internal loss. The number of SOAGs in a… (More)
A novel optical phase-locked loop (PLL), which utilizes four wave mixing in a fiber as a phase detector, is proposed to track a data rate clock in an optically time-division-multiplexed (TDM) data stream, and to generate a prescaled electric clock directly. An optical TDM 20 Gb/s-105 km transmission experiment has been successfully performed with the… (More)
Dispersion compensation by the prechirp technique is theoretically investigated, and experimental results are discussed. An improvement of more than two times was observed for dispersion-limited transmission lengths in 5-Gb/s, 150-km and 10-Gb/s, 50-km transmission with a semiconductor electroabsorption external modulator and a normal fiber. An allowable… (More)
Wavelength-division-multiplexing (WDM) transport ring-network architectures analogous to conventional time-division multiplexing systems are disadvantageous in that they require either an increase in the necessary number of wavelengths, or long optical-transmission brought about by loop-back, thus raising costs. We have studied a transport WDM ring network… (More)
A 10-Gbit/s optical asynchronous cell-packet receiver with a fast bit-synchronization circuit has been developed for achieving beyond Tbit/s optical switch. Less than nine-bit fast acquisition time and <1.5 dB receiver sensitivity penalty have been achieved.
This paper describes 48 x 100 Mbit/s data link subsystem using a 6 x 1.1 Gbit/s arrayed optical transceiver module and 15-ns deskew function ICs. This link will be applied to the real world computing (RWC)-1, which is one of the massively parallel computer with 1,000-class processor elements.
A method for suppressing degradation due to nonlinearities in transmission fibers in lumped repeater systems is proposed. This method increases optical amplifier repeater spacing by setting a normal dispersion fiber as a transmission fiber, and by setting a 1.3- mu m zero-dispersion wavelength fiber as a dispersion compensator at the end in each repeater… (More)