Patent EP0473440A2 successfully refreshed from Google Patents.
EP0473440A2
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An optical wave-length filter and a driving method thereof
Assignee: Oki Electric Industry Co Ltd
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Filing: 1991-08-29
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Granted: —
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Expires: 2011-08-29
Abstract
Abstract There is provided an optical wave-length filter which is constituted by a wave-guide route (26) formed on a surface of a substrate (32); a front stage polarizer (20) disposed in the wave-guide route (26) for transmitting as an input light either TM mode light or TE mode light; a plurality of mode-converters (22) disposed in the wave-guide route for mode converting one TM/TE-mode light transmitted from the front stage polarizer (20) having a conversion wave length corresponding to an output light of the optical wave-length filter into the other TE/TM-mode light; and a rear stage polarizer (24) disposed in the wave-guide route (26) for transmitting as the output light of the optical wave-length filter the other TE/TM-mode light; the mode-converters (22) being constituted by a finger-type electrode for control (28) and a finger-type electrode for earthing (30) interdigitally coupled for each other and disposed along the wave-guide route.
Inventors
- 👤 Hideaki c/o OKI Electric Industry Co.Ltd Okayama
- 👤 Hiroki c/o OKI Electric Industry Co.Ltd Yaegashi
- 👤 Toshimasa c/o OKI Electric Ind. Co. Ltd Ishida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 17:42
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/035; G02F1/0353; G02F1/0136; G02F1/0142; G02F2201/00; G02F2201/12; G02F2201/124; G02F2203/00; G02F2203/05; G02F2203/055
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
135 words
An optical wave-length filter comprising: a) a wave-guide route formed on a surface of a substrate; b) a front stage polarizer disposed in the wave-guide route for transmitting as an input light either TM mode light or TE mode light; c) a plurality of mode-converters disposed in the wave-guide route for mode converting one TM/TE-mode light transmitted from the front stage polarizer having a conversion wave length corresponding to an output light of the optical wave-length filter into the other TE/TM-mode light; the mode-converters being constituted by a finger-type electrode for control and a finger-type electrode for earthing interdigitally coupled for each other and disposed along the wave-guide route; and d) a rear stage polarizer disposed in the wave-guide route for transmitting as the output light of the optical wave-length filter the other TE/TM-mode light.
Claim 2
Dependent Claim
28 words
The optical wave-length filter set forth in claim 1, wherein both periods of the finger-type electrodes for control and earthing are common with respect to all the mode-converters.
Claim 3
Dependent Claim
34 words
The optical wave-length filter set forth in claim 2, wherein all the finger-type electrodes for control and earthing disposed between the front stage and the rear stage polarizers are disposed with an equal interval.
Claim 4
Dependent Claim
21 words
The optical wave-length filter set forth in claim 2, wherein a length of all the mode-converters is equal for each other.
Claim 5
Dependent Claim
25 words
The optical wave-length filter set forth in claim 2, wherein a length of the mode-converter becomes shorter or longer sequentially in a direction of arrangement.
Claim 6
Dependent Claim
82 words
A driving method for driving the optical wave-length filter according to claim 1, wherein a voltage applied to each of the finger-type electrodes for control is controlled such that a distribution of electric field along the wave-guide route generated by the finger-type electrodes for control and the finger-type electrodes for earthing has a pseudo sine-wave form accompanying a beat, and the distribution of electric field is preserved to be a fixed distribution corresponding to a conversion wave-length with which mode-conversion is proceeded.
Claim 7
Dependent Claim
52 words
The driving method for driving the optical wave-length filter set forth in claim 6, wherein a voltage applied to each of the finger-type electrodes for control is controlled such that a distribution of electric field along the wave-guide route has a pseudo sine-wave form relative to corresponding disposed positions of the electrodes.
Claim 8
Dependent Claim
202 words
An optical wave-length filter comprising: a) a wave-guide route formed on a surface of a substrate; b) a front stage polarizer disposed in the wave-guide route for transmitting as an input light either TM mode light or TE mode light; c) a plurality of first mode-converters disposed in the wave-guide route for mode converting one TM/TE-mode light transmitted from the front stage polarizer having a conversion wave length corresponding to an output light of the optical wave-length filter into the other TE/TM-mode light; d) a middle stage polarizer disposed in the wave-guide route for transmitting the other TE/TM-mode light from the first mode-converters; e) a plurality of second mode-converters disposed in the wave-guide route for mode converting the other TE/TM-mode light transmitted from the middle stage polarizer having the conversion wave length corresponding to the output light of the optical wave-length filter into one TM/TE-mode light; the first and the second mode-converters being constituted by a finger-type electrode for control and a finger-type electrode for earthing interdigitally coupled for each other and disposed along the wave-guide route; and f) a rear stage polarizer disposed in the wave-guide route for transmitting as the output light of the optical wave-length filter one TM/TE-mode light.
Claim 9
Dependent Claim
67 words
The optical wave-length filter set forth in claim 8, wherein both periods of the finger-type electrodes for control and earthing of the first mode-converters are common with respect to all the first mode-converters; both periods of the finger-type electrodes for control and earthing of the second mode-converters are common with respect to all the second mode-converters; and the first common period differs from the second common period.
Claim 10
Dependent Claim
61 words
The optical wave-length filter set forth in claim 9, wherein all the finger-type electrodes for control and earthing disposed between the front stage and the middle stage polarizers are disposed with an first equal interval; and all the finger-type electrodes for control and earthing disposed between the middle stage and the rear stage polarizers are disposed with a second equal interval.
Claim 11
Dependent Claim
118 words
A driving method for driving the optical wave-length filter according to claim 8, wherein a voltage applied to each of the finger-type electrodes for control is controlled such that a first distribution of electric field along the wave-guide route generated by the finger-type electrodes for control and the finger-type electrodes for earthing of the first mode-converters and a second distribution of electric field along the wave-guide route generated by the finger-type electrodes for control and the finger-type electrodes for earthing of the second mode-converters respectively have a pseudo sine-wave form accompanying a beat, and each of the distributions of electric field is preserved to be a fixed distribution corresponding to a conversion wavelength with which mode-conversion is proceeded.
Claim 12
Dependent Claim
102 words
The driving method for driving the optical wave-length filter set forth in claim 11, wherein a first voltage applied to each of the finger-type electrodes for control of the first mode-converters is controlled such that a first distribution of electric field along the wave-guide route has a pseudo sine-wave form relative to corresponding disposed positions of the electrodes, and a second voltage applied to each of the finger-type electrodes for control of the second mode-converters is controlled such that a second distribution of electric field along the wave-guide route has a pseudo sine-wave form relative to corresponding disposed positions of the electrodes.
Claim 13
Dependent Claim
100 words
A filter comprising a waveguide (26) formed on a substrate (32); a front stage polariser (20) for transmitting radiation in a predetermined first transmission mode into the waveguide; a rear stage polariser (24) for transmitting radiation in a predetermined second transmission mode from the waveguide, and a plurality of mode converters (22) disposed along the waveguide (26) for changing the mode of radiation from the first to the second mode characterised in that the mode converters (22) are operable concurrently such that they together cooperate to define the wavelength of light converted from the first mode to the second mode.
References Cited (Backward Citations)
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