EP0419216A2
Expired / Lapsed
EP
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Optical data transmission device with parallel channel paths for arrayed optical elements
Assignee: Toshiba Corp
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Filing: 1990-09-18
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Granted: —
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Expires: 2010-09-18
Abstract
Abstract A parallel optical data transmission device has an optical signal emitting unit (10), an optical signal reception unit (20), and a parallel optical signal transmission cable (30) for optically coupling therebetween. The optical signal emitting unit (10) has an array of semiconductor lasers (14), whereas the reception unit (20) has an array of semiconductor photodetectors (24) of the same number. The transmission cable (30) essentially consists of optical fibers bundled together. In the optical signal emitting unit (10), electrical drive signal transfer lines (18) for the lasers (14) have a stair-step bending pattern such that their transmission lengths sequentially vary. In the optical reception unit (20), electrical signal transmission lines (28) for the photodetectors (24) likewise has a stair-step bending pattern such that their transmission lengths sequentially differ, this stair-step pattern is like a reversed version of the stair-step pattern in the optical signal emitting unit (10), whereby the total lengths of electrical signal transmission line paths are made equal to one another for the respective transmission channels, thus ensuring compensation for a delay in parallel signal transmission.
Inventors
- 👤 Hideto C/O Intellectual Property Div. Furuyama
- 👤 Masaru C/O Intellectual Property Div. Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 15:50
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/25; H04B10/2507; G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/43; H10; H10W; H10W72/00; H10W72/50; H10W72/531; H10W72/536; H10W72/5363; H10W72/541; H10W72/5445; H10W72/90; H10W72/931; H10W72/932
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
219 words
An optical transmission device comprising first and second base plate means (12, 16; 22, 26) mutually spaced and having electrical signal terminals (A, B) formed at first selected intervals, an array of a preselected number of light-emitting means (14) provided on said first base plate means (12, 16) and arranged at second intervals which are smaller than said first intervals, an array of photodetective means (24) equal in number to said light-emitting means (14), provided on said second base plate means (22, 26) and arranged at said second intervals, and optical coupling means (30) for optically coupling said first and second base plate means (12, 16; 22, 26), said optical coupling means (30) having parallel transmission lines which allow independent transmission of optical signals between said light-emitting means and (14) said photosensitive means (24), characterized in that delay compensation means is provided for compensating for a delay in transmission of optical signals between said light-emitting means (14) and said photodetective means (24) via said parallel transmission lines, and in that said delay compensation means includes electrical line-path length equalizer means (18, 28) for making total lengths of electric transmission line paths of said parallel transmission lines, which run through said electrical signal terminals (A, B), said light-emitting means (14) and said photodetective means (24), substantially equal to one another.
Claim 2
Dependent Claim
219 words
An optical transmission device comprising first and second base plate means (12, 16; 22, 26) mutually spaced and having electrical signal terminals (A, B) formed at first selected intervals, an array of a preselected number of light-emitting means (14) provided on said first base plate means (12, 16) and arranged at second intervals which are smaller than said first intervals, an array of photodetective means (24) equal in number to said light-emitting means (14), provided on said second base plate means (22, 26) and arranged at said second intervals, and optical coupling means (30) for optically coupling said first and second base plate means (12, 16; 22, 26), said optical coupling means (30) having parallel transmission lines which allow independent transmission of optical signals between said light-emitting means and (14) said photosensitive means (24), characterized in that delay compensation means is provided for compensating for a delay in transmission of optical signals between said light-emitting means (14) and said photodetective means (24) via said parallel transmission lines, and in that said delay compensation means includes electrical line-path length equalizer means (18, 28) for making total lengths of electric transmission line paths of said parallel transmission lines, which run through said electrical signal terminals (A, B), said light-emitting means (14) and said photodetective means (24), substantially equal to one another.
Claim 3
Dependent Claim
125 words
The device according to claim 1, characterized in that said electrical line-path length equalizer means comprises first wiring lines (18) provided on said first base plate means (12, 16) and defining a predetermined pattern which provides sequentially different electrical connection line lengths between said electrical signal terminals (A) formed on said first base plate means (12, 16) and said light-emitting means (14), and second wiring lines (28) provided on said second base plate means (22, 26) for electrically connecting said photodetective means (24) and said electrical signal terminals (B) formed on said second base plate means (22, 26) in mutually different lengths, said second wiring lines (28) defining an inverted pattern which corresponds to a reversed version of said pattern of said first wiring tines.
Claim 4
Dependent Claim
42 words
The device according to claim 2, characterized in that said patterns of each of said first and second wiring lines (18, 28) are shaped to make phase shifts between electrical signals being transferred along said parallel transmission lines equal to one another.
Claim 5
Dependent Claim
24 words
The device according to claim 3, characterized in that each of said first and second wiring lines (18, 28) is bent at least once.
Claim 6
Dependent Claim
27 words
The device according to claim 4, characterized in that said second wiring lines (28) are bent in a direction opposite that of said first wiring lines (18).
Claim 7
Dependent Claim
44 words
The device according to claim 5, characterized in that said first wiring lines (18) are bent with a same curvature by a same number of times, while said second wiring lines (28) are bent with a same curvature by a same number of times.
Claim 8
Dependent Claim
77 words
The device according to claim 1, characterized by further comprising first bonding wires (122) for electrically connecting said first wiring lines (120) to said light-emitting means (118), respectively, ground wiring lines (146) provided on said first base plate means (114) and alternately arranged between said first wiring lines (120), dummy devices (144) alternately arranged between said light-emitting means (118), and second bonding wires (148) for electrically connecting said ground wires (146) to said dummy devices (144), respectively.
Claim 9
Dependent Claim
28 words
The device according to claim 7, characterized in that said second bonding wires (148) are substan-tially equal in a spatially extending shape to said first bonding wires (122).
Claim 10
Dependent Claim
55 words
The device according to claim 1, characterized by further comprising a photosensitive monitoring means (258) associated with at least one of said light-emitting means (256), and optical waveguide means (264), defined in said first base plate means (254), for partially guiding an optical output of the corresponding light-emitting means (256) to said monitoring means (258).
Claim 11
Dependent Claim
34 words
The device according to claim 9, characterized in that said optical waveguide means (264) extends in such a way as to at least partially overlap a corresponding one of said first wiring lines (262).
Claim 12
Dependent Claim
24 words
The device according to claim 10, characterized in that said optical waveguide means (264) is independently provided for all of said light-emitting means (256).
Claim 13
Dependent Claim
140 words
A substrate structure (210, 250) for an optical data transmission device having a light-emitting element (216, 256) and an optical-output monitoring photosensitive element (218, 258) therefor, said substrate structure comprising an insulative substrate layer (212, 254), and an electrical signal transmission line (224, 262) formed on said substrate layer (212) and having one end electrically connected to said light-emitting element and the other end electrically connected to a signal input terminal (226, 270) for receiving a drive signal for said light-emitting element (216, 256), characterized in that an optical signal transmission line (232, 264) is formed within said substrate layer (212, 254) and having one end optically coupled to said light-emitting element and the other end optically coupled to said photosensitive element (218, 258), said electrical signal transmission line (224, 262) partially overlapping said optical signal transmission line (232, 264).
Claim 14
Dependent Claim
140 words
A substrate structure (210, 250) for an optical data transmission device having a light-emitting element (216, 256) and an optical-output monitoring photosensitive element (218, 258) therefor, said substrate structure comprising an insulative substrate layer (212, 254), and an electrical signal transmission line (224, 262) formed on said substrate layer (212) and having one end electrically connected to said light-emitting element and the other end electrically connected to a signal input terminal (226, 270) for receiving a drive signal for said light-emitting element (216, 256), characterized in that an optical signal transmission line (232, 264) is formed within said substrate layer (212, 254) and having one end optically coupled to said light-emitting element and the other end optically coupled to said photosensitive element (218, 258), said electrical signal transmission line (224, 262) partially overlapping said optical signal transmission line (232, 264).
Claim 15
Dependent Claim
48 words
The structure according to claim 12, characterized in that one of said electrical signal transmission line (224, 262) and said optical signal transmission line (232, 264) is bent, thereby permitting a signal output terminal (236) of said photosensitive element to be arranged close to said signal input terminal.
Claim 16
Dependent Claim
27 words
The structure according to claim 12, characterized in that said optical signal transmission line (232, 264) comprises an optical waveguide buried in said substrate layer (212, 254).
Claim 17
Dependent Claim
28 words
The structure according to claim 12, characterized in that said optical signal transmission line (232, 264) comprises an optical transmission cable buried in said substrate layer (212, 254).
Claim 18
Dependent Claim
20 words
The structure according to claim 12, characterized in that said substrate layer (212, 254) is metallized on its back surface.
Claim 19
Dependent Claim
36 words
The structure according to claim 12, characterized in that said electrical signal transmission line comprises a preselected type of signal transmission line (224, 262) including a microstrip line configuration formed on said substrate layer (212, 254).
References Cited (Backward Citations)
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