K. Kitayama

1.28 Tbit/s (160 Gbit/s/spl times/8 wavelengths) throughput variable length packet switching using optical code based label switch

A novel ultra-high speed (over 160 Gbit/s), large throughput (over 1 Tbit/s), variable-length optical packet switching system, based on all-optical parallel table lookup for all the packets with different wavelength by an optical transparent label processor, is proposed. 1.28 Tbit/s optical packet switching with 120 km transmission is demonstrated.

Gain Dynamics in Quantum-Dot Semiconductor Optical Amplifiers at 1550 nm

We report an experimental study of the gain recovery of an InAs-InGaAsP-InP columnar-quantum-dot semiconductor optical amplifier around 1550 nm. We find a three-step recovery process that gives around 85% gain recovery in only 10 ps and 100% in around 30 ps in case of a quite complete gain saturation. We also give a possible physical explanation for the peculiar gain dynamics.

Full-Duplex 25-GHz Spacing DWDM MM-Wave-Band Radio-on-Fiber System Using a Supercontinuum Light Source and Arrayed-Waveguide-Grating Filters

We demonstrate for the first time the full-duplex transmission of 25-GHz spacing dense wavelength-division multiplexing (DWDM) millimeter-wave-band radio-on-fiber (RoF) system using a supercontinuum (SC) light source and optical frequency interleaving technique. In the proposed scheme, filtering response of the arrayed waveguide gratings for demultiplexer and multiplexer is used for suppression of undesired optical sidebands. All the 25-GHz spacing SC modes are used for downlink transmission with photonic up-conversion. The uplink RoF signals are generated with photonic down-conversion from the reused downlink signals. The up- and downlinks 60-GHz-band 156-Mbps RoF signals were simultaneously transmitted over 25-km standard single-mode fibers with error-free and 0.5 dB power penalties

Full-duplex demonstration of single electroabsorption transceiver basestation for mm-wave fiber-radio systems

Full-duplex, 156 Mbit/s, 60 GHz-band millimeter-wave fiber-radio signal transmission over 25 km-long fiber is experimentally demonstrated for the first time by using single two-RF-port EAT. The approach to single-EAT-BS will become a powerful candidate for fiber-radio access systems.

Error-free full-duplex optical WDM-FDM transmission using an EA-transceiver

We propose the utilization of a waveguide EA-modulator as a full-duplex transceiver for WDM based optic networks. The modulation properties of a fiber-coupled 1.55 /spl mu/m InGaAsP/InP waveguide EA-modulator such as extinction ratio, insertion loss and electrical bandwidth are experimentally determined and detection properties are analyzed in terms of responsivity and electrical bandwidth. Furthermore, the EA-transceiver is employed within an optical link and error-free full-duplex transmission is achieved.

Simplified BS without light source and RF local oscillator in full duplex millimeter-wave radio-on-fiber system based upon external modulation technique

A simpler full-duplex radio-on-fiber system using a single light source is investigated. Error-free simultaneous fiber-optic transmission of 60-GHz-band down- and uplink signals over 25-km-long standard single-mode fibers is experimentally demonstrated without serious dispersion problem.

Optical add-drop multiplexing of 60 GHz millimeterwave signals in a WDM radio-on-fiber ring

A full-duplex millimeterwave over fiber ring system consisting of two simple basestations is presented. The basestations are addressed using individual wavelengths. Bit error rates below 10-9 are achieved for 156 Mb/s down- and uplink data within the 60 GHz band simultaneously.

Fiber-length extension in an optical 60-GHz transmission system using an EA-modulator with negative chirp

By optimizing the driving conditions of a highspeed electroabsorption modulator, we achieved a significant fiber-length extension and dispersion penalty reduction in a 60-GHz millimeter-wave indoor fiber-optic transmission system. In particular, we demonstrate simultaneous transmission of two 156-Mb/s data channels in the 60-GHz band over 1409-m standard single-mode fiber without employing an additional dispersion compensation technique.

A compact remote antenna base station for microwave/millimeter-wave dual-band radio-on-fiber systems

A practically compact prototype of dual-band base station for use in the dual-band ROF systems is described. This system is used to realize the dual-band ROF transmission, where microwave- and mm-wave-band radio signals are simultaneously transmitted in single optical fiber link. An error-free simultaneous fiber-optic transmission of 2.45-GHz and 60-GHz-band signals with the dual-band BS prototype is also experimentally demonstrated.

80 Gb/s multicast wavelength conversion by XGM in a QD-SOA

We report effective all-optical multicast wavelength conversion exploiting cross gain modulation (XGM) in a QD-SOA. 80 Gb/s multi-conversion on four 400 GHz spaced wavelengths is demonstrated with moderate Q2 factor penalty.