Hiroyuki Rokugawa

A broadband access network based on optical signal processing: the photonic highway

A broadband access network, the photonic highway, which is based on optical signal processing (OSP) and consists of photonic access nodes (PANs), which process optical signals directly, is discussed. Each PAN has an optical drop/insert function. The authors focus on the configuration of the fiber network and access nodes and describe its application to a metropolitan area network (MAN) and a CATV distribution network. They also describe the basic experiments conducted to verify the proposed architecture using newly developed bistable laser diodes.<<ETX>>

Skew-free parallel optical transmission systems

This paper proposes two kinds of parallel line codes based on multiplexing and nonmultiplexing, and a method of automatic skew suppression based on bit synchronization and frame synchronization. This achieves parallel high-speed optical transmission to overcome bottlenecks in parallel electronic transmission and to increase the distance of high-throughput interconnections. We have developed GaAs coder/decoder large-scale integrations (LSIs) for the coding algorithm and skew suppression, and analog LSIs for compact, low-power, highspeed parallel optical links. Experimental results show that our proposed parallel transmission methods and fabricated LSIs can play a key role in realizing high-speed, long-distance parallel transmission and in reducing the size and power consumption of high-throughput parallel optical links.

Photonic highway: broad-band ring subscriber loops using optical signal processing

The introduction of optical signal processing technology into transmission systems and basic experiments with optical drop/insert using bistable laser diodes are discussed. With broadband integrated services digital network (B-ISDN) architecture and technology now under study, optical signal processing (OSP) is being considered to increase network capacity and flexibility. B-ISDN will require over 40 Gb/s in the feeder loop that connects the central office and remote terminals having drop/insert function. Remote terminals will process large amounts of high-speed data. An OSP-based broadband subscriber loop photonic highway that uses a ring architecture linking photonic access nodes (PANs) that directly process optical signals is proposed. Each PAN has an optical drop/insert function and can synchronize optical frame signals using a proposed optical sampling memory. Optical drop/insert experiments confirmed the feasibility of the proposed method. >

All-optical data-latch experiments for photonic access nodes in the photonic highway

Abstract A novel approach to direct access at the optical level is proposed. We conducted experiments on all-optical data-latch functions using bistable laser diodes (LDs) for all-optical droplinsert operation in a 50-Mbitls data highway.

Low-voltage gigabit optical transmitter using a direct logic gate modulation of a tandem-electrode laser

We propose a new direct-modulation scheme for use in a high-speed optical transmitter with a direct logic gate connection to a laser diode. We have confirmed gigabit-per-second operation with voltage modulation onto a tandem-electrode laser.

Consideration of Optical Channel Number and Data/Frame Phase Tolerance for the Photonic Ring Highway

This paper discusses the maximum channel number and allowable data/frame phase tolerance in a photonic ring highway and gives experimental results using a new high-speed bistable laser diode.