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US5812709A
Expired / Lapsed
US
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Optical device having switching function
Assignee: Hitachi Cable Ltd
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Filing: 1996-05-31
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Granted: 1998-09-22
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Expires: 2016-05-31
Abstract
Abstract An optical device having a switching function has a waveguide filter for switching whether input signal light of including at least one specific wavelength should be transmitted or reflected. The input signal lights of wavelength of λ 1 ˜λn are transmitted to the input waveguide. When the waveguide filter is off, the signal lights of all wavelength are transmitted to the output port. When the waveguide filter is on, the signal light of wavelength of λ 2 ˜λn are transmitted, but the signal light of wavelength of λ 2 is reversed and output to the drop port. If the thin film heaters are off, a signal light of wavelength of λ 1 is output (dropped) from the drop port. If the thin film heaters are on, it is reversed and transmitted to the output port.
Inventors
- 👤 Hideaki Arai
- 👤 Hisato Uetsuka
- 👤 Kenji Akiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:20
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/28; G02B6/293; G02B6/29346; G02B6/2935; G02B6/29352; G02B6/10; G02B6/12; G02B6/12007; G02B6/29379; G02B6/29395; G02F; G02F1/00; G02F1/29; G02F1/31; G02F1/313; G02F1/3136; H; H04; H04J; H04J14/00; H04J14/02; H04J14/0201; H04J14/0202; H04J14/0206; H04J14/0213; G02B2006/12133; G02B2006/12145; G02B2006/12164; G02B6/29398; G02F1/01; G02F1/0147; G02F2201/00; G02F2201/30; G02F2201/307; G02F2203/00; G02F2203/05; G02F2203/055; H04J14/0209; H04J14/0215; H04J14/0219
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
180 words
An optical device having a switching function, comprising: an input waveguide and an output waveguide, said input waveguide and said output waveguide being partially disposed to be adjacent each other, thereby forming a 3 dB coupler, a waveguide filter for switching an input signal light including at least one specific wavelength to be transmitted or reflected therein, said waveguide filter including a pair of gratings and phase shift switches provided on extending parts of both said input waveguide and said output waveguide extended from said 3 dB coupler; a first circulator connected to said input waveguide and having an input port for inputting said input signal light to said waveguide filter, and a drop port for outputting said reflected signal light of said at least one specific wavelength; a second circulator connected to said output waveguide and having an output port for outputting said transmitted signal light, and an add port for inputting an add signal light of said at least one specific wavelength; and a reflecting film disposed on ends of both said input waveguide and said output waveguide.
Claim 2
Dependent Claim
180 words
An optical device having a switching function, comprising: an input waveguide and an output waveguide, said input waveguide and said output waveguide being partially disposed to be adjacent each other, thereby forming a 3 dB coupler, a waveguide filter for switching an input signal light including at least one specific wavelength to be transmitted or reflected therein, said waveguide filter including a pair of gratings and phase shift switches provided on extending parts of both said input waveguide and said output waveguide extended from said 3 dB coupler; a first circulator connected to said input waveguide and having an input port for inputting said input signal light to said waveguide filter, and a drop port for outputting said reflected signal light of said at least one specific wavelength; a second circulator connected to said output waveguide and having an output port for outputting said transmitted signal light, and an add port for inputting an add signal light of said at least one specific wavelength; and a reflecting film disposed on ends of both said input waveguide and said output waveguide.
Claim 3
Dependent Claim
37 words
The optical device having a switching function, according to claim 1, wherein: said waveguide filter is connected in series to a waveguide filter on a single substrate and disposed between said first circulator and said second circulator.
Claim 4
Dependent Claim
20 words
An optical device having a switching function according to claim 1, wherein: said phase shift switches are thin film heaters.
Claim 5
Dependent Claim
41 words
An optical device having a switching function, according to claim 1, wherein: said gratings are photo-induced gratings fabricated by irradiating ultraviolet light at least on a core of Ge doped silica glass so as to induce periodical change of refractive index.
Claim 6
Dependent Claim
20 words
An optical device having a switching function, according to claim 1, wherein: said 3 dB coupler is a directional coupler.
Claim 7
Dependent Claim
122 words
The optical device having a switching function, comprising: first and second waveguides, said first and second waveguides being partially disposed to be adjacent to each other, thereby forming a 3 dB coupler, first and second gratings provided on said first and second waveguides at one end from said 3 dB coupler, respectively, so as to reflect a signal light of a specific wavelength, third and fourth gratings provided on said first and second waveguides at a back stage of said first and second gratings, respectively, so as to reflect remaining signal lights except for said signal light of a specific wavelength; and first and second phase controllers provided on said first and second waveguides, respectively, for controlling phase of a transmitting light.
Claim 8
Dependent Claim
122 words
The optical device having a switching function, comprising: first and second waveguides, said first and second waveguides being partially disposed to be adjacent to each other, thereby forming a 3 dB coupler, first and second gratings provided on said first and second waveguides at one end from said 3 dB coupler, respectively, so as to reflect a signal light of a specific wavelength, third and fourth gratings provided on said first and second waveguides at a back stage of said first and second gratings, respectively, so as to reflect remaining signal lights except for said signal light of a specific wavelength; and first and second phase controllers provided on said first and second waveguides, respectively, for controlling phase of a transmitting light.
Claim 9
Dependent Claim
27 words
The optical device having a switching function, according to claim 6, wherein: said phase controllers are electrically controlled as to shift the phase of light by π/2.
Claim 10
Dependent Claim
78 words
The optical device having a switching function, according to claim 6, wherein said optical device further comprising: a first circulator having an input port for inputting an input signal light to said 3 dB coupler, and a drop port for outputting a signal light reflected from said 3 dB coupler; and a second circulator having an output port for outputting an signal light output from said 3 dB coupler, and an add port for adding a signal light.
Claim 11
Dependent Claim
51 words
The optical device having a switching function, according to claim 6, wherein: said first and second gratings, and said first and second phase controller are combined so as to provide a waveguide switch, a plurality of said waveguide switches are connected in series so as to provide a multiple switching function.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-09-21 | 2002-03-23 | 2002-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-21 | 2006-03-23 | 2006-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-21 | 2010-03-23 | 2010-09-22 | $7700.00 | Window Closed / Lapsed |