Patent US854514A successfully refreshed from Google Patents.
Patent EP0496348A2 successfully refreshed from Google Patents.
EP0496348A2
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EP
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Multi-wavelength light detecting apparatuses having serially arranged grating directional couplers
Assignee: Canon Inc
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Filing: 1992-01-21
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Granted: —
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Expires: 2012-01-21
Abstract
Abstract In a multi-wavelength light detecting and/or emitting apparatus, there are provided at least one of at least of a first unit of a first directional coupler having a grating for an optical coupling function and a photodetector having a photoelectric conversion function and at least a second unit of a second directional coupler having a grating for an optical coupling function and a semiconductor laser, and a common light waveguide extending parallel with the unit in a light propagating direction. The first directional coupler and the photodetector are serially arranged in the light propagating direction and parallel with the common light waveguide, and the second directional coupler and the semiconductor laser are serially arranged in the light propagating direction and parallel with the common light waveguide. When there are formed a plurality of the first units and the gratings have different pitches, wavelength multiplexed light signals can be simultaneously detected per each wavelength with an equal detection performance. When there are formed a plurality of the second units and the gratings have different pitches, laser lights of different wavelengths can be emitted from a single emission end of the common waveguide and the semiconductor lasers can be independently driven.
Inventors
- 👤 Hajime c/o Canon Kabushiki Kaisha Sakata
- 👤 Shinsuke C/O Canon Kabushiki Kaisha Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 03:51
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/12007; G02B6/24; G02B6/42; G02B6/4201; G02B6/4249; H; H01; H01S; H01S5/00; H01S5/10; H01S5/1028; H01S5/1032; H01S5/40; H01S5/4025; H01S5/4031; G02B6/26; G02B6/28; G02B6/293; G02B6/29331; G02B6/29332; G02B6/29334; H01S5/0014; H01S5/0028; H01S5/02; H01S5/026; H01S5/0262; H01S5/0264; H01S5/1035; H01S5/4087; H01S5/50; H01S5/5045
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
65 words
A multi-wavelength light detecting and/or emitting apparatus comprising: at least a first unit of a first directional coupler having a grating for an optical coupling function and a photodetector having a photoelectric conversion function, said first directional coupler and said photodetector being serially arranged in a light propagating direction; and a common light waveguide extending parallel with said first unit in the light propagating direction.
Claim 2
Dependent Claim
58 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 1, further comprising at least a second unit of a second directional coupler having a grating for an optical coupling function and a semiconductor laser, said second directional coupler and said semiconductor laser being serially arranged in the light propagating direction and parallel with said common light waveguide.
Claim 3
Dependent Claim
35 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 1, wherein there are provided a plurality of said first units and said gratings of said first directional couplers have different pitches from each other.
Claim 4
Dependent Claim
35 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 2, wherein there are provided a plurality of said second units and said gratings of said second directional couplers have different pitches from each other.
Claim 5
Dependent Claim
29 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 1, wherein said first directional coupler comprises two parallel waveguides and a cladding layer therebetween formed on a substrate.
Claim 6
Dependent Claim
23 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 5, wherein said grating is formed on one of said two parallel waveguides.
Claim 7
Dependent Claim
19 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 1, wherein said photodetector comprises a MES-FET type photodetector.
Claim 8
Dependent Claim
18 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 1, wherein said photodetector comprises a pin photodetector.
Claim 9
Dependent Claim
42 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 1, wherein said first directional couplers are arranged in an order from a shortest pitch of said grating thereof to a longest pitch of said grating thereof from a light input side.
Claim 10
Dependent Claim
20 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 1, wherein a groove is formed between said first units.
Claim 11
Dependent Claim
22 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 1, wherein a light absorbing region is formed between said first units.
Claim 12
Dependent Claim
27 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 1, wherein a boundary surface between said first units is slantly formed to the light propagating direction.
Claim 13
Dependent Claim
22 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 1, further comprising means for changing an effective pitch of said grating.
Claim 14
Dependent Claim
58 words
A multi-wavelength light detecting and/or emitting apparatus comprising: at least a unit of a directional coupler having a grating for an optical coupling function and a semiconductor laser, said directional coupler and said semiconductor laser being serially arranged in a light propagating direction; and a common light waveguide extending parallel with said unit in the light propagating direction.
Claim 15
Dependent Claim
33 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 14, wherein there are provided a plurality of said units and said gratings of said directional couplers have different pitches from each other.
Claim 16
Dependent Claim
28 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 14, wherein said directional coupler comprises two parallel waveguides and a cladding layer therebetween formed on a substrate.
Claim 17
Dependent Claim
23 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 14, wherein said grating is formed on one of said two parallel waveguides.
Claim 18
Dependent Claim
21 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 14, wherein said semiconductor laser comprises a DFB type semiconductor laser.
Claim 19
Dependent Claim
21 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 14, wherein said semiconductor laser comprises a DBR type semiconductor laser.
Claim 20
Dependent Claim
20 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 14, wherein said grating has a forward direction coupling function.
Claim 21
Dependent Claim
20 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 14, wherein said grating has a reverse direction coupling function.
Claim 22
Dependent Claim
20 words
A multi-wavelength light detecting and/or emitting apparatus according to claim 1, wherein said semiconductor laser comprises a tunable semiconductor laser.
References Cited (Backward Citations)
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