US4859017A
Expired / Lapsed
US
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Dielectric optical Fabry-Perot waveguide device and method for making and using same
Assignee: British Telecommunications PLC
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Filing: 1986-07-21
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Granted: 1989-08-22
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Expires: 2006-07-21
Abstract
Abstract A selective filtering device for use in optical communications systems takes the form of a transversely coupled Fabry-Perot interferometer. One described embodiment comprises a first length of monomode optical fiber transversely coupled to a second fiber in a coupling region. One end of each fiber at opposite respective ends of the coupling region is provided with a suitable highly reflective surface, or example, an evaporated gold/aluminum deposit. In operation, a light input may be modified by the resonant cavity behavior of the Fabry-Perot cavity formed between the mirrored ends to provide filtered or enhanced outputs. The outputs may be further modified by alternative or additional light input via the ends of the fibers.
Inventors
- 👤 Michael C. Brierley
- 👤 Stephen R. Mallinson
- 👤 Colin A. Millar
- 👤 William P. Urquhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:35
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/28; G02B6/293; G02B6/29346; G02B6/29358; H; H01; H01S; H01S3/00; H01S3/05; H01S3/08; H01S3/30; H01S3/302
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
71 words
A dielectric optical waveguide device (1) comprising a first waveguide (2) transversely coupled to a second waveguide (3) at a coupling region (6), wherein the first and second waveguides (2, 3) have substantially identical propagation constants at all wavelengths, and one end (5, 8) of each waveguide (2, 3) selected at opposite respective ends of said coupling region (6) is provided with a reflection means, thereby to form a Fabry-Perot cavity.
Claim 2
Dependent Claim
71 words
A dielectric optical waveguide device (1) comprising a first waveguide (2) transversely coupled to a second waveguide (3) at a coupling region (6), wherein the first and second waveguides (2, 3) have substantially identical propagation constants at all wavelengths, and one end (5, 8) of each waveguide (2, 3) selected at opposite respective ends of said coupling region (6) is provided with a reflection means, thereby to form a Fabry-Perot cavity.
Claim 3
Dependent Claim
14 words
A device according to claim 1 wherein said waveguides (2,3) are monomode optical fibres.
Claim 4
Dependent Claim
16 words
A device according to claim 1 wherein said waveguides (2,3) are formed in a planar substrate.
Claim 5
Dependent Claim
19 words
A device according to claim 1 wherein the reflection means comprises a high reflectivity surface comprising a metallic coating.
Claim 6
Dependent Claim
19 words
A device according to claim 1 wherein the reflection means comprises a high reflectivity surface comprising a dielectric coating.
Claim 7
Dependent Claim
34 words
A device according to claim 1 or claim 2, wherein the waveguids (2, 3) within the Fabry-Perot cavity are doped with a dopant, in addition or alternative to any conventional refractive index modifying dopant.
Claim 8
Dependent Claim
14 words
A device according to claim 6 wherein said dopant is a light amplifying medium.
Claim 9
Dependent Claim
26 words
A device according to claim 1 or claim 2 including tuning means to alter the length (L2+L4) of the Fabry-Perot cavity, thereby to tune the device.
Claim 10
Dependent Claim
14 words
A device according to claim 8 wherein the tuning means comprises a piezo-electric stretcher.
Claim 11
Dependent Claim
72 words
A dielectric optical waveguide device (1) comprising a first waveguide (2) transversely coupled to a second waveguide (3) at a coupling region (6), wherein one end (5, 8) of each waveguide (2, 3) selected at opposite respective ends of said coupling region (6) is provided with a reflection means, thereby to form a Fabry-Perot cavity, wherein the coupling parameter, K, is at least 0.75 across the operating spectral range of the device.
Claim 12
Dependent Claim
72 words
A dielectric optical waveguide device (1) comprising a first waveguide (2) transversely coupled to a second waveguide (3) at a coupling region (6), wherein one end (5, 8) of each waveguide (2, 3) selected at opposite respective ends of said coupling region (6) is provided with a reflection means, thereby to form a Fabry-Perot cavity, wherein the coupling parameter, K, is at least 0.75 across the operating spectral range of the device.
Claim 13
Independent Claim
121 words
A method of wavelength selection of optical signals using a dielectric optical waveguide device (1) comprising a first waveguide (2) transversely coupled to a second waveguide (3) at a coupling region (6), wherein the first and second waveguide (2, 3) have substantially identical propagation constants at all wavelengths, and one end (5, 8) of each waveguide (2, 3) selected at opposite respective ends of said coupling region (6) is provided with a reflection means, thereby to form a Fabry-Perot cavity, said method of wavelength selection comprising the step of: inputting optical signals (E1, E2) into a or each waveguide (2, 3), whereby selected optical signals (E 3 , E 4 ) are output from the device from output ports (4, 7).
Claim 14
Independent Claim
121 words
A method of wavelength selection of optical signals using a dielectric optical waveguide device (1) comprising a first waveguide (2) transversely coupled to a second waveguide (3) at a coupling region (6), wherein the first and second waveguide (2, 3) have substantially identical propagation constants at all wavelengths, and one end (5, 8) of each waveguide (2, 3) selected at opposite respective ends of said coupling region (6) is provided with a reflection means, thereby to form a Fabry-Perot cavity, said method of wavelength selection comprising the step of: inputting optical signals (E1, E2) into a or each waveguide (2, 3), whereby selected optical signals (E 3 , E 4 ) are output from the device from output ports (4, 7).
Claim 15
Dependent Claim
49 words
A method according to claim 11 comprising the step of: inputting the optical signals (E1, E2) at a power above the SBS/SRS threshold for the Fabry-Perot cavity at the wavelength of the signals, thereby to obtain an optical output (E 3 , E 4 ) at a different wavelength.
Claim 16
Independent Claim
122 words
A method of manufacturing a dielectric optical waveguide device (1) including a first waveguide (2) transversely coupled to a second waveguide (3) at a coupling region (6), wherein the first and second waveguides (2, 3) have substantially identical propagation constants at all wavelengths, and one end (5, 8) of each waveguide (2, 3) selected at opposite respective ends of said coupling region (6) is provided with a reflection means, thereby to form a Fabry-Perot cavity, said method comprising the steps of: providing reflective surfaces on one end of each of two dielectric optical waveguides; and coupling the two waveguides at a coupling region such that ends of the two waveguides having reflective surfaces are at opposite respective ends of the coupling region.
Claim 17
Independent Claim
122 words
A method of manufacturing a dielectric optical waveguide device (1) including a first waveguide (2) transversely coupled to a second waveguide (3) at a coupling region (6), wherein the first and second waveguides (2, 3) have substantially identical propagation constants at all wavelengths, and one end (5, 8) of each waveguide (2, 3) selected at opposite respective ends of said coupling region (6) is provided with a reflection means, thereby to form a Fabry-Perot cavity, said method comprising the steps of: providing reflective surfaces on one end of each of two dielectric optical waveguides; and coupling the two waveguides at a coupling region such that ends of the two waveguides having reflective surfaces are at opposite respective ends of the coupling region.
References Cited (Backward Citations)
US4466694A
Cited
JPS5855911A
Cited
US4720160A
Cited
JPS58169037A
Cited
EP0103382A2
Cited
US4515431A
Cited
US4536088A
Cited
EP0104942A2
Cited
US4530603A
Cited
GB2136956A
Cited
US4627728A
Cited
US4592043A
Cited
EP0136871A2
Cited
WO1985002469A1
Cited
EP0143645A1
Cited
EP0146262A2
Cited
US4676583A
Cited
US4639922A
Cited
US4799749A
Cited
US4794617A
Cited
US4768849A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |