Wataru Domon

A 500Mbps 60GHz-Band Transceiver for IEEE 1394 Wireless Home Networks

This paper presents 500Mbps 60GHz-band ASK transceivers as the first wireless transmission system for IEEE 1394 multimedia home networks. Direct ASK modulation and demodulation adopting heterojunction FET MMIC switch and detector enable a simple transceiver configuration. Error-free transmissions have been realized for higher than ¿47dBm received power. A couple of IEEE 1394 S400 (400Mbps) wireless adapters have demonstrated 12m line-of-sight transmission and room-to-room connections.

60GHz-Band Flip-Chip MMIC Modules for IEEE1394 Wireless Adapters

60GHz-band 500-Mpbs transmitter and receiver multi-chip modules (MCMs) are presented, in which MMICs and a filter are mounted using flip-chip bonding technique. A multi-layer Low Temperature Co-fired Ceramic (LTCC) substrate is adopted for a package. The MCMs are directly bonded with printed wiring boards using ball grid array technique, achieving connections for signals and biasing. A developed 500-Mbps ASK transceiver exhibits an average output power of 10dBm and a minimum received power of ¿55dBm. The transceiver is applied to the IEEE1394 wireless adapter which demonstrates 17-m communication distance in line of sight.

SCM optical multiple-access network with cascaded optical modulators

The authors propose a novel optical multiple-access network with cascaded optical intensity modulators using subcarrier multiplexing (SCM). This network is free from beat noise because each node shares signal light from one transmitter laser diode (LD) with the other nodes. The properties involved in intermodulation distortion due to cascade connection of the optical modulators were analyzed, and the applicability of this network to a video monitoring system was investigated. Results indicate that a wide-area monitoring system with 260-km transmission distance and 52 video terminals is possible with the proposed network.<<ETX>>

Optical multiple-access network with subcarrier multiplexing

The feasibility of optical multiple-access using subcarrier multiplexing (SCM), which enables achieving simple, low cost and flexible networks is reported. A novel network configuration with cascaded optical modulators is proposed for beat-noise-free operation. The basic transmission characteristics for the proposed network are analyzed, and a wide area video monitoring system using the proposed network configuration is designed.

Gigabit-To-The-Home (GTTH); Gbps optical access system for future multimedia infrastructure

In this paper, an ultrabroadband optical access system for a future multimedia infrastructure, Gigabit-to-the-home (GTTH), is described. GTTH is based on a fiber-to-the-Home (FTTH) architecture and offers a very large downlink capacity of 2.5 Gbps. Because of this large downlink capacity, various broadband communication services and digital broadcasting services with hundreds of video programs can be simultaneously provided. GTTH also has high flexibility due to its multiple-interface architecture based on a bit multiplexing/demultiplexing scheme, which enables hybrid integration of multiple systems regardless of their signal formats, protocols, and transfer modes. A laboratory model of GTTH was developed. The optical network unit was achieved with small size, low power consumption and high receiver sensitivity by using a one-chip receiver IC, a high-speed CMOS demultiplexer, and a super lattice avalanche photo diode, which are newly developed for GTTH. The system demonstrates the service integration capability by simultaneously providing an ATM-based broadband communication service with the transmission capacity of 156 Mbps and multichannel broadcasting services with 300 video programs with MPEG2 format.