EP0504882A2
Expired / Lapsed
EP
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Optical waveguide device and method for connecting optical waveguide and optical fiber using the optical waveguide device
Assignee: Fujitsu Ltd
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Filing: 1992-03-19
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Granted: —
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Expires: 2012-03-19
Abstract
Abstract An optical waveguide device which can be connected with an optical fiber through a simple positioning adjustment. The optical waveguide device comprises a substrate (2), a first cladding (4) with a uniform thickness formed on the substrate, a core (8a) formed on the first cladding, a recognizable thin layer (6) formed on the first cladding on both sides of the core, and a second cladding (12) formed on the first cladding so as to cover the core. The thin layer (6) is parallel to the top surface of the substrate (2) and defines a reference plane which is substantially in the same plane as the bottom surface of the core. In performing the connecting work, the optical fibers (28), and the columnar rods (26), are seated in the V grooves (22a) and (22b), and (24), respectively, of the substrate (18) and, then, the optical waveguide device (16) is mounted on the substrate (18) in such a way that the Si thin film layer (6) defining the reference plane of the optical waveguide device (16) comes into contact with the columnar rods (26). The shapes of the V grooves (22a,22b) and (24) and the diameters of the optical fibers (28) and the columnar rods (26) are set so that each core (8a) of the waveguide and the core of the optical fiber (28) are lying in the same plane at this time.
Inventors
- 👤 Hideki c/o Fujitsu Limited Isono
- 👤 Kaoru c/o Fujitsu Limited Moriya
- 👤 Eiji c/o Fujitsu Limited Kikuchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 01:20
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/30; G02B6/10; G02B6/12; G02B6/122; G02B6/42; G02B6/4201; G02B6/4249
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
An optical waveguide device comprising: a substrate having a top surface; a first cladding with a uniform thickness formed on said substrate; a core formed on said first cladding; a recognizable thin layer formed on said first cladding on both sides of said core, said thin layer defining a reference plane which is parallel to the top surface of said substrate and lies substantially in the same plane as the bottom surface of said core; and a second cladding formed on said first cladding so as to cover said core.
Claim 2
Dependent Claim
84 words
An optical waveguide device comprising: a substrate having a top surface; a first cladding with a uniform thickness formed on said substrate; a core formed on said first cladding; a reference layer with the same thickness as said core formed on said first cladding on both sides of said core, said reference layer defining a reference plane lying in the same plane as the top surface of said core; and a second cladding formed on said first cladding so as to cover said core.
Claim 3
Dependent Claim
36 words
An optical waveguide device according to claim 2, wherein said reference layer is formed in the same step as the step in which said core is formed and has the same refractive index as said core.
Claim 4
Independent Claim
249 words
A method for connecting an optical waveguide with an optical fiber comprising the steps of: preparing an optical waveguide device comprising a substrate, a first cladding formed on said substrate, a core formed on said first cladding, a recognizable thin layer formed on said first cladding on both sides of said core, said thin layer defining a reference plane which is parallel to the top surface of said substrate and lies substantially in the same plane as the bottom surface of said core, and a second cladding having a predetermined shape formed on said first cladding; preparing a support substrate having an opening formed therein virtually in the same shape as said second cladding of said optical waveguide device, a first groove formed therein such that it extends from one end to the other end of said support substrate and crossing over said opening, and a pair of second grooves formed therein on both sides of said opening; placing an optical fiber in said first groove; placing columnar rods in said pair of second grooves; mounting said optical waveguide device on said support substrate such that said second cladding is received in said opening and said reference plane abuts on said columnar rods; adjusting the position of said optical waveguide device in a plane with said reference plane held in contact with said columnar rods so that said optical fiber is aligned with said core; and bonding said optical waveguide device and said optical fiber to said support substrate.
Claim 5
Independent Claim
206 words
A method for connecting an optical waveguide with an optical fiber comprising the steps of: preparing an optical waveguide device comprising a substrate, a first cladding formed on said substrate, a core formed on said first cladding, a recognizable thin layer formed on said first cladding on both sides of said core, said thin layer defining a reference plane which is parallel to the top surface of said substrate and lies substantially in the same plane as the bottom surface of said core, and a second cladding having a predetermined shape formed on said first cladding; fixing a ferrule, with an optical fiber inserted therein and fixed up, to a support substrate; fixing a pair of columnar rods on said support substrate on both sides of said ferrule in such a way that said rods are extended parallel to the longitudinal direction of said ferrule; mounting said optical waveguide device on said support substrate such that said reference plane abuts on said columnar rods; adjusting the position of said optical waveguide device in a plane with said reference plane held in contact with said columnar rods so that said optical fiber is aligned with said core; and bonding said optical waveguide device to said support substrate.
Claim 6
Independent Claim
259 words
A method for connecting optical waveguides with optical fibers comprising the steps of: preparing an optical waveguide device comprising a substrate, a first cladding formed on said substrate, a plurality of cores formed on said first cladding at a predetermined pitch, a reference layer formed on said first cladding on both sides of said cores with the same thickness as the thickness of said cores, said reference layer defining a reference plane lying in the same plane as the top surface of said cores, and a second cladding formed on said first cladding so as to cover said cores, said reference layer having a pair of grooves formed therein spaced apart a predetermined distance sandwiching said cores; preparing a fiber array assembly comprising a plate and a plurality of optical fibers fixed on said plate at the same pitch as the pitch between said plurality of cores, said fiber array assembly having a pair of first V grooves formed therein spaced apart the same distance as said grooves and a cutting formed in one end portion thereof, and end faces of said optical fibers being terminated at the edge of said cutting; mounting said fiber array assembly on said optical waveguide device with columnar rods having a predetermined diameter interposed between said grooves and said first V grooves; pressing said fiber array assembly against said optical waveguide device so that the end faces of said optical fibers are put in contact with the end faces of said cores; and bonding said fiber array assembly to said optical waveguide device.
Claim 7
Dependent Claim
52 words
A method for connecting optical waveguides with optical fibers according to claim 6, wherein said plate has a plurality of second V grooves arranged at the same pitch as the pitch between said cores and each of said optical fibers is placed in and bonded to each of said second V grooves.
References Cited (Backward Citations)
No citation records indexed.
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