Nippon Electric Glass Co., Ltd.

Toto Ltd.

Hirokazu Takeuchi

Nobuo Funabiki

Masanori Wada

Sotohiro Nakajima

Tadashi Seto

Kazuya Saito

Tomoaki Kawamura

Kouichi Yabuuchi

Nagaharu Nakajima

Hirokazu Tanaka

Masaaki Kadomi

Yoshimasa Yamaguchi

Masahiro Kobayashi

Shuhei Ogawa

Katsumi Inada

Kazunari Yamamoto

Masanobu Minami

Azusa Tanaka

Mitsutaka Nakae

Shintaro Ito

Hiroshi Okumura

Chisami Ishida

A method of manufacturing a polarizing glass sheet includes subjecting, while heating, a glass preform sheet containing metal halide particles to down-drawing, to thereby provide a glass member having stretched metal halide particles dispersed in an aligned manner in a glass matrix, and subjecting the glass member to reduction treatment to reduce the stretched metal halide particles, to thereby provide a polarizing glass sheet. A shape of the glass preform sheet during the down-drawing satisfies a relationship of the following expression:&#x2265;1.0where Lrepresents a length between a portion in which a width of the glass preform sheet has changed to 0.8 times an original width and a portion in which the width of the glass preform sheet has changed to 0.2 times the original width W, and Wrepresents a length equivalent to 0.5 times the original width Wof the glass preform sheet.

Polarizing glass sheet set for optical isolator and method for manufacturing optical element for optical isolator

Polarizing glass plate and method for manufacturing same, polarizing glass plate set for optical isolator, and method for manufacturing optical element for optical isolator

What is achieved is an optical wavelength multiplexer/demultiplexer not necessarily requiring the function of adjusting the optical path. A value (&#x394;L&#x2212;&#x394;L)/L obtained by dividing a difference between a maximum value &#x394;Land a minimum value &#x394;Lof &#x394;L in a range of &#x2212;40&#xb0; C. to 80&#xb0; C. by L is 8&#xd7;10or less where L represents a length of a crystallized glass () at 30&#xb0; C. and &#x394;L represents a difference between a length (L) of the crystallized glass () at each of the temperatures and the length (L) thereof at 30&#xb0; C.

Crystallized glass and method for manufacturing same

A capillary tube holds an optical fiber. The capillary tube includes an insertion hole for inserting and fixing the optical fiber formed therein, a cylindrical surface as an outer circumferential surface, and a groove formed in the cylindrical surface in an axial direction thereof. Regions from the cylindrical surface to both inner side surfaces of the groove each have a projecting curved surface, and regions from both the inner side surfaces of the groove to a bottom of the groove each have a recessed curved surface.

Capillary tube for holding an optical fiber

Provided is a ferrule holding member with a transparent body attached to an inner hole of a sleeve. The transparent body has a primary end face for bringing into contact with an end face of a plug ferrule at a halfway position in an axial direction of the sleeve. The primary end face of the transparent body has a convex curved surface obtained through heat treatment. The convex curved surface is preferably an unpolished surface, and a region with a radius of 75 &#x3bc;m or more, centered around a shaft axis of the sleeve at the convex curved surface, has a convex spherical surface. Alternatively, the transparent body is directly fixed to an inner surface of the sleeve through heat treatment.

Ferrule holding member for an optical receptacle, method of manufacturing the same, and optical receptacle using the same

One or a plurality of flat portions and one or a plurality of partial cylindrical portions connected to such flat portions are an exterior surface of a glass capillary tube for holding an optical fiber, with all partial cylindrical portions having the same single central axis and being defined by a common radius, and an insertion hole, into which an optical fiber is inserted and held, is formed at a position deviated from the central axis in a direction perpendicular to one of the flat portions, which serves as a benchmark.

Capillary tube for holding optical fiber

An optical fiber array substratehas, in one surface thereof, eight V-groovesfor securing eight optical fibersaligned in parallel to each other, and V-shaped side groovesformed outside of the respective outermost V-grooveslocated at the opposite sides of the substrate. The apexes of the outside ridgesanddefining the outermost V-groovesare at the same height as the apexes of the inside ridgesand, the height of the bottomof the side grooveis lower than that of a contact pointbetween the ridge line of the V-grooveand optical fiber

Optical fiber array substrate

An optical receptacle comprises a precision sleeve, a stub with an optical fiber fixed to one end of an inner hole of the precision sleeve through an adhesive, and a sleeve holder fixed to an outer periphery of the precision sleeve by press-fitting or through the adhesive. An outer periphery of the stub with an optical fiber and the inner hole of the precision sleeve has a surface roughness Ra value of 0.1 &#x3bc;m or more and 0.5 &#x3bc;m or less.

Optical receptacle

An object of the present invention is to very accurately position and align a plurality of optical fibers in each groove of a substrate for an optical fiber array, without leading to inappropriate upsizing and complication of an apparatus and increase in cost. To achieve the object, an optical-fiber aligning partof a substrateis formed, in parallel, with a plurality of groovesat least on the top thereof, the plurality of grooves retaining and aligning a plurality of optical fibersA cross section perpendicular to a longitudinal direction of the groovesis recessed at a center portion of the top in the widthwise direction, and depths A of the groovesprovided at the center portion are shallower than depths A of the groovesprovided at both ends in the widthwise direction.

Substrate for optical fiber array and method for fabricating the same

Optical fiber array substrate and method for producing the same

A glass capillary tubeis connected and fixed in a straight line to an optical componenthaving a substantially rectangular cross-section perpendicular to an optical axis. Moreover, a top-surface side end portionand a rear-surface side end portionof an exterior surfaceof the glass capillary tubeare positioned at the same level as the top surface and the rear surface of the exterior surface of the optical componentin the height-wise direction, respectively, while the central axis of an insertion hole, which is provided in the glass capillary tubeand into which an optical fiberis inserted and fixed, is matched with the optical axisof the optical component

Capillary tube for holding optical fiber and connecting structure for optical component

Disclosed is an optical collimator-use lens component including: a thin tube; a partially spherical lens that has been fixed in an inner hole of the thin tube so that an insertion portion having a predetermined length is left, is made of glass whose refractive index is approximately uniform, and has translucent spherical surfaces, whose centers of curvature are approximately the same, at both ends of a cylindrical portion of the partially spherical lens; and an adhesive that bonds the partially spherical lens to the thin tube. An axial deviation amount between a center axis of the thin tube and an optical axis of the partially spherical lens is 5 &#x3bc;m or less. When a capillary tube, in whose inner hole an optical fiber has been fixed and whose axial deviation amount between an outer peripheral surface of the capillary tube and a core center of an end surface of the optical fiber is 1.5 &#x3bc;m or less, is inserted into the insertion portion of the thin tube and the end surface of the optical fiber is fixed at a position at which a distance of the end surface to a focal point position of the partially spherical lens becomes &#xb1;40 &#x3bc;m or less, emission light has an emission light bend of 0.2&#xb0; or less with respect to the center axis of the thin tube.

Optical collimator-use lens component, optical collimator, and method of assembling these

A prism is produced by the steps of feeding a glass base material into a heating furnace, the glass base material having surfaces to be prism surfaces after forming, the Ra value of the surface roughness of the surface being less than the Ra value corresponding to #170, the glass base material having a predetermined dimensional ratio, grasping the glass base material with feeding means, and feeding the glass base material into a heating furnace to heat the glass base material to a temperature so that a minimum viscosity of the glass base material becomes equal to or more than 10Pa&#xb7;s and less than 10Pa&#xb7;s, drawing and forming the lower portion of the glass base material, and then cutting the glass base material to obtain a longer body having a desired dimension and prism surfaces with the Ra value of the surface roughness equal to or less than a quarter of the wavelength of incident light, and cutting the longer body into desired length.

Prism and method for producing the same

A ferrule with optical fiber is held to a ferrule holder. The ferrule is made of a material with 0.5&tilde;2 times the wearing speed characteristic in comparison with a quartz glass. The ferrule holder comprises a polishing plate which has an elastic module equivalent to 70&tilde;95 degrees of rubber hardness in a state of adhering a polishing sheet thereon. The ferrule holder is made to be self-supported on a polishing table in a manner such that the end face of the ferrule with optical fiber is in contact with the polishing sheet. The ferrule holder is made to manually move on the polishing table by a predetermined distance in the horizontal direction to slide the end face of the ferrule with optical fiber on the polishing sheet, thereby the end face of the ferrule with optical fiber is polished to a spherical convex surface centered on the optical fiber.

Method for polishing end face of ferrule with optical fiber, method for assembling optical connector, and terminating kit for optical fiber

The capillary for optical fiber has an inner hole allowing an optical fiber to be inserted and retained therein. Ra value of the surface roughness of the inner hole is 0.1 &mgr;m to 0.5 &mgr;m. The ferrule for optical connector is provided with a chamfered part on one end of the capillary for optical fiber for guiding it into a sleeve and a flared part on the other end of the capillary for optical fiber for guiding the optical fiber into the inner hole.

Growing community of inventors

Otsu, Japan

Hirokazu Takeuchi