Hiroshi Yokosuka

High port density MT-RJ transceiver

This paper reports our current development work on the compact optical transceiver module designed for, use with the MT-RJ connector for high speed optical data transmission applications. The key technology for realizing low cost and miniaturized outline package is a unique optical sub-assembly (OSA) design based on low cost plastic molded interconnect device (MID) technology. This small form factor (SFF) transceiver also uses a single +3.3 V custom IC that integrates all necessary drivers, repeater and control circuitry for increased reliability and low production cost by reducing the number of assembly parts. Thorough performance testing has also shown the transceiver satisfies the requirements of IEEE 802.3z Gigabit Ethernet data communication standard.

Multifiber optical components for subscriber networks

Optical components used in subscriber networks must display superior optical performance and reliability. Optical components such as the planar waveguide coupler module and MT connector and their respective alignment and connection technologies are described in this paper. These components are presently being used in PDS networks as well as in remote fiber test systems used for the maintenance of optical fiber networks.

A low loss multifiber connector and its applications

A plastic molded multifiber connector which can splice fiber ribbons has been widely introduced into fiber-optic subscriber networks. The connector is made by a precision transfer molding method, employing an ultrahigh-precision multi-V-grooves mold. Its dimensional accuracy is so high that single-mode four-fiber ribbons are spliced with an average loss of 0.3 dB using refractive-index matching oil. The connector is mainly used for an optical-fiber ribbon cable which includes factor-mounted connectors and has up to 1000 fibers. Recently, the multifiber plastic connector has been used in an optical filter for fiber ribbons, in a mechanical switch for fiber ribbons, and in a high-speed mechanical switch.<<ETX>>

Photonic sensing components for fiber networks

Photonic sensing technologies are an integral part of Remote Fiber Test Systems used for maintaining optical fiber networks. Optical components used for this purpose such as branching components, filters, switches, water sensors and fiber identifiers are overviewed.Photonic sensing technologies are an integral part of Remote Fiber Test Systems used for maintaining optical fiber networks. Optical components used for this purpose such as branching components, filters, switches, water sensors and fiber identifiers are overviewed.