US4852960A
Expired / Lapsed
US
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Narrow-linewidth resonant optical device, transmitter, system, and method
Assignee: Nokia Bell Labs
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Filing: 1988-09-23
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Granted: 1989-08-01
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Expires: 2008-09-23
Abstract
Abstract Highly frequency-selective reflectivity is realized in an optical device including a waveguide and an evanescent-field coupled grating resonator cavity. The device may include a light source and serve as a low-chirp, narrow-linewidth communications laser for use, e.g., for transmission over a fiber having non-negligible dispersion and also in wavelength-multiplexed coherent systems.
Inventors
- 👤 Rodney C. Alferness
- 👤 Charles H. Henry
- 👤 Rudolf F. Kazarinov
- 👤 Nils A. Olsson
- 👤 Kenneth J. Orlowsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:51
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/12007; G02B6/24; G02B6/26; G02B6/28; G02B6/2804; G02B6/2821; G02B6/42; H; H01; H01S; H01S5/00; H01S5/02; H01S5/026; H01S5/0262; H01S5/0264; G02B6/293; G02B6/29331; G02B6/29332; G02B6/29334; G02B6/29335; G02B6/29337; G02B6/29346; G02B6/29356; H01S5/0206; H01S5/021; H01S5/10; H01S5/1021; H01S5/1028; H01S5/1032; H01S5/12; H01S5/125; H01S5/14; H01S5/141; H01S5/142
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
72 words
An optical device comprising first and second optical waveguides, said first waveguide being designed for optical input and optical output, said second waveguide being in side-by-side optical coupling relationship with said first waveguide, said second waveguide comprising first and second sections in which effective refractive index varies in a spatially periodic fashion, whereby said second waveguide is adapted as a resonator for radiation at a desired wavelength traveling in said first waveguide.
Claim 2
Dependent Claim
72 words
An optical device comprising first and second optical waveguides, said first waveguide being designed for optical input and optical output, said second waveguide being in side-by-side optical coupling relationship with said first waveguide, said second waveguide comprising first and second sections in which effective refractive index varies in a spatially periodic fashion, whereby said second waveguide is adapted as a resonator for radiation at a desired wavelength traveling in said first waveguide.
Claim 3
Dependent Claim
20 words
The device of claim 1, said first and second sections being in quarter-wave shifted relationship as based on said wavelength.
Claim 4
Dependent Claim
26 words
The device of claim 1, said first and second sections being spaced apart by a distance which is greater than the Bragg length of said sections.
Claim 5
Dependent Claim
13 words
The device of claim 1, said first and second optical waveguides being substrate-supported.
Claim 6
Dependent Claim
17 words
The device of claim 1, further comprising light-emitting means disposed for optical input to said first waveguide.
Claim 7
Dependent Claim
20 words
The device of claim 5, said light-emitting means comprising a light-emitting region which consists essentially of a Group III-V material.
Claim 8
Dependent Claim
19 words
The device of claim 1, further comprising an optical fiber disposed to receive optical output from said first waveguide.
Claim 9
Dependent Claim
13 words
The device of claim 1, said first and second sections comprising diffraction gratings.
Claim 10
Dependent Claim
11 words
The device of claim 4, said substrate consisting essentially of silicon.
Claim 11
Dependent Claim
19 words
The device of claim 9, said first and second waveguides comprising cladding portions which consist essentially of silica glass.
Claim 12
Dependent Claim
19 words
The device of claim 10, said first and second waveguides comprising core portions which consist essentially of silicon nitride.
Claim 13
Dependent Claim
19 words
The device of claim 10, said first and second waveguides comprising core portions which consist essentially of phosphosilicate glass.
Claim 14
Dependent Claim
17 words
The device of claim 1, said device comprising means for monitoring radiation traveling in said first waveguide.
Claim 15
Dependent Claim
21 words
The device of claim 1, said device comprising a third waveguide which is in side-by-side coupling relationship with said second waveguide.
Claim 16
Dependent Claim
99 words
An optical transmitter, said transmitter comprising an optical communications laser and means for modulating laser radiation, said communications laser comprising an amplifying portion and a reflector portion, said reflector portion comprising first and second optical waveguides, said first waveguide being designed for optical input and optical output, said second waveguide being in side-by-side optical coupling relationship with said first waveguide, said second waveguide comprising first and second sections in which effective refractive index varies in a spatially periodic fashion, whereby said second waveguide is adapted as a resonator for radiation at a desired wavelength traveling in said first waveguide.
Claim 17
Dependent Claim
99 words
An optical transmitter, said transmitter comprising an optical communications laser and means for modulating laser radiation, said communications laser comprising an amplifying portion and a reflector portion, said reflector portion comprising first and second optical waveguides, said first waveguide being designed for optical input and optical output, said second waveguide being in side-by-side optical coupling relationship with said first waveguide, said second waveguide comprising first and second sections in which effective refractive index varies in a spatially periodic fashion, whereby said second waveguide is adapted as a resonator for radiation at a desired wavelength traveling in said first waveguide.
Claim 18
Dependent Claim
110 words
An optical communications system, said system comprising an optical transmitter and an optical receiver, said transmitter comprising an optical communications laser and means for modulating laser radiation, said communications laser comprising an amplifying portion and a reflector portion, said reflector portion comprising first and second optical waveguides, said first waveguide being designed for optical input and optical output, said second waveguide being in side-by-side optical coupling relationship with said first waveguide, said second waveguide comprising first and second sections in which effective refractive index varies in a spatially periodic fashion, whereby said second waveguide is adapted as a resonator for radiation at a desired wavelength traveling in said first waveguide.
Claim 19
Dependent Claim
110 words
An optical communications system, said system comprising an optical transmitter and an optical receiver, said transmitter comprising an optical communications laser and means for modulating laser radiation, said communications laser comprising an amplifying portion and a reflector portion, said reflector portion comprising first and second optical waveguides, said first waveguide being designed for optical input and optical output, said second waveguide being in side-by-side optical coupling relationship with said first waveguide, said second waveguide comprising first and second sections in which effective refractive index varies in a spatially periodic fashion, whereby said second waveguide is adapted as a resonator for radiation at a desired wavelength traveling in said first waveguide.
Claim 20
Dependent Claim
29 words
The communications system of claim 16, said communications system comprising a plurality of transmitters designed to emit optical radiation at differing frequencies, and means for multiplexing said optical radiation.
Claim 21
Independent Claim
103 words
A method for transmitting a signal, said method comprising operating an optical transmitter, said optical transmitter comprising an optical communications laser, said laser comprising an amplifying portion and a reflector portion, said reflector portion comprising first and second optical waveguides, said first waveguide being designed for optical input and optical output, said second waveguide being in side-by-side optical coupling relationship with said first waveguide, said second waveguide comprising first and second sections in which effective refractive index varies in a spatially periodic fashion, whereby said second waveguide is adapted as a resonator for radiation at a desired wavelength traveling in said first waveguide.
Claim 22
Independent Claim
103 words
A method for transmitting a signal, said method comprising operating an optical transmitter, said optical transmitter comprising an optical communications laser, said laser comprising an amplifying portion and a reflector portion, said reflector portion comprising first and second optical waveguides, said first waveguide being designed for optical input and optical output, said second waveguide being in side-by-side optical coupling relationship with said first waveguide, said second waveguide comprising first and second sections in which effective refractive index varies in a spatially periodic fashion, whereby said second waveguide is adapted as a resonator for radiation at a desired wavelength traveling in said first waveguide.
Claim 23
Dependent Claim
14 words
The method of claim 18, said method comprising monitoring radiation in said first waveguide.
Claim 24
Dependent Claim
19 words
The method of claim 18, said method comprising controlling refractive index in at least a part of said laser.
Claim 25
Dependent Claim
10 words
The method of claim 20, said method comprising temperature control.
Claim 26
Dependent Claim
14 words
The method of claim 21, said method comprising temperature control of said amplifying portion.
Claim 27
Dependent Claim
19 words
The method of claim 20, said method comprising temperature control of at least a portion of said reflector portion.
References Cited (Backward Citations)
US4312562A
Cited
US4669816A
Cited
USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
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