Fujikura Limited

Yoshiya Isono

Tsutomu Watanabe

Takehisa Ide

Akiyoshi Asada

Mitsuhiro Nakazawa

Koji Tanaka

Hiroshi Osanai

Makoto Ohsawa

Hitoshi Ohira

A passive method is provided as alignment means for aligning an optical fiber with an optical element in assembling an optical module, while increasing alignment accuracy. A mount () equipped with an optical element () is positioned by abutment on a face () of a projection () formed inside a package () and on a side () of a positioning pad () projecting from the bottom () of the package. A mount () equipped with an optical element () is positioned by abutment on an inner wall () of the package and on a face () of a projection () formed inside the package. Since the optical power of received or emitted light need not be monitored for fine adjustments of alignment, this method is less expensive.

Optical module, optical element attachment method, and receptacle-fitted optical module

An oxygen sensor for determining the partial pressure of oxygen in a monitored gas environment includes a diffusion housing of zirconia based material having a gas diffusion aperture, an oxygen ion conductive plate of zirconia based material, a pair of electrode layers mounted on opposite sides of the conductive plate, and a sealing glass material sealingly bonding the conductive plate at one side to the housing to provide a diffusion chamber defined by the diffusion housing and the conductive plate. The electrodes are connectable to a power source for being supplied with an electric potential to pump oxygen ion out of the diffusion chamber through the conductive plate to flow a current through the electrodes which current is indicative of the partial pressure of the oxygen in the monitored gas environment. The sealing glass material contains SiO.sub.2, BaO, Na.sub.2 O and ZrO.sub.2.

Oxygen sensor for and method of determining concentration of oxygen

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Sakura, Japan

Yoshiya Isono