Patent US5457758A successfully refreshed from Google Patents.
US5457758A
Expired / Lapsed
US
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Add-drop device for a wavelength division multiple, fiber optic transmission system
Assignee: GROVE HYDROGEN CELLS LLC
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Filing: 1993-10-29
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Granted: 1995-10-10
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Expires: 2013-10-29
Abstract
Abstract Device for use in adding or dropping light signals at predetermined center wavelengths to or from a wavelength division multiplex, fiber optic transmission system. The device includes an evanescent wave coupler having a coupling region formed from two single mode waveguides, the coupling region being formed so that there is substantially complete evanescent field coupling of light from one waveguide to the other in a predetermined wavelength band. Further, the device has a Bragg grating disposed in the coupling region in each of the waveguides.
Inventors
- 👤 Elias Snitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:49
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/28; G02B6/293; G02B6/29331; G02B6/29332; G02B6/29334; G02B6/29379; G02B6/2938; G02F; G02F1/00; G02F1/29; G02F1/31; G02F1/313; G02F1/3132; H; H01; H01S; H01S3/00; H01S3/10; H01S3/10007; H01S3/10023; G02B6/2804; G02B6/2821; G02B6/2835; G02B2006/2839; G02F2201/00; G02F2201/30; G02F2201/307; H01S3/05; H01S3/06; H01S3/063; H01S3/067; H01S3/0675; H01S3/09; H01S3/091; H01S3/094; H01S3/11; H01S3/1106; H01S3/1112; H01S3/1115
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
175 words
A device for use in coupling light signals having wavelengths in a region at a predetermined wavelength out of or into a transmission system which carries light signals, the device comprising: an evanescent wave coupler having a coupling region formed from two single mode waveguides, wherein size and spacing of the waveguides in the coupling region are fabricated having dimensions determined by a condition that the coupling region is sufficiently long for complete evanescent field coupling of light from one waveguide to the other in a predetermined wavelength band, the coupling region has a length which is equal to a distance which provides complete evanescent field coupling of light in the band from one waveguide to the other, which length is referred to as a half-beat-length, said waveguides having a core therein; and a Bragg grating disposed in said core at the center of the coupling region in each of the waveguides, said center of said Bragg grating occurring at a distance equal to one quarter beat length from an end of the coupling region.
Claim 2
Independent Claim
175 words
A device for use in coupling light signals having wavelengths in a region at a predetermined wavelength out of or into a transmission system which carries light signals, the device comprising: an evanescent wave coupler having a coupling region formed from two single mode waveguides, wherein size and spacing of the waveguides in the coupling region are fabricated having dimensions determined by a condition that the coupling region is sufficiently long for complete evanescent field coupling of light from one waveguide to the other in a predetermined wavelength band, the coupling region has a length which is equal to a distance which provides complete evanescent field coupling of light in the band from one waveguide to the other, which length is referred to as a half-beat-length, said waveguides having a core therein; and a Bragg grating disposed in said core at the center of the coupling region in each of the waveguides, said center of said Bragg grating occurring at a distance equal to one quarter beat length from an end of the coupling region.
Claim 3
Dependent Claim
12 words
The device of claim 1 wherein the single mode waveguides are identical.
Claim 4
Dependent Claim
19 words
The device of claim 2 wherein the Bragg grating is reflective to light having wavelengths in the coupling region.
Claim 5
Dependent Claim
12 words
The device of claim 1 wherein the waveguides are integrated optics waveguides.
Claim 6
Dependent Claim
14 words
The device of claim 1 wherein the waveguides are single mode optical fiber waveguides.
Claim 7
Independent Claim
149 words
A device for use in coupling light signals having wavelengths in a region at a predetermined wavelength out of or into a transmission system which carries light signals, the device comprising: an evanescent wave coupler having a coupling region formed from two single mode waveguides, wherein size and spacing of the waveguides in the coupling region are fabricated having dimensions determined by a condition that the coupling region is sufficiently long for complete evanescent field coupling of light from one waveguide to the other in a predetermined wavelength band, a Bragg grating disposed in said core of the coupling region in each of the waveguides, wherein the coupling region has a length which is equal to even multiples of a distance for complete evanescent field coupling of light from one waveguide to the other in the predetermined wavelength band to occur, which length is referred to as a half-beat-length.
Claim 8
Independent Claim
149 words
A device for use in coupling light signals having wavelengths in a region at a predetermined wavelength out of or into a transmission system which carries light signals, the device comprising: an evanescent wave coupler having a coupling region formed from two single mode waveguides, wherein size and spacing of the waveguides in the coupling region are fabricated having dimensions determined by a condition that the coupling region is sufficiently long for complete evanescent field coupling of light from one waveguide to the other in a predetermined wavelength band, a Bragg grating disposed in said core of the coupling region in each of the waveguides, wherein the coupling region has a length which is equal to even multiples of a distance for complete evanescent field coupling of light from one waveguide to the other in the predetermined wavelength band to occur, which length is referred to as a half-beat-length.
Claim 9
Independent Claim
149 words
A device for use in coupling light signals having wavelengths in a region at a predetermined wavelength out of or into a transmission system which carries light signals, the device comprising: an evanescent wave coupler having a coupling region formed from two single mode waveguides, wherein size and spacing of the waveguides in the coupling region are fabricated having dimensions determined by a condition that the coupling region is sufficiently long for complete evanescent field coupling of light from one waveguide to the other in a predetermined wavelength band, a Bragg grating disposed in said core of the coupling region in each of the waveguides, wherein the coupling region has a length which is equal to odd multiples of a distance for complete evanescent field coupling of light from one waveguide to the other in the predetermined wavelength band to occur, which length is referred to as a half-beat-length.
Claim 10
Independent Claim
149 words
A device for use in coupling light signals having wavelengths in a region at a predetermined wavelength out of or into a transmission system which carries light signals, the device comprising: an evanescent wave coupler having a coupling region formed from two single mode waveguides, wherein size and spacing of the waveguides in the coupling region are fabricated having dimensions determined by a condition that the coupling region is sufficiently long for complete evanescent field coupling of light from one waveguide to the other in a predetermined wavelength band, a Bragg grating disposed in said core of the coupling region in each of the waveguides, wherein the coupling region has a length which is equal to odd multiples of a distance for complete evanescent field coupling of light from one waveguide to the other in the predetermined wavelength band to occur, which length is referred to as a half-beat-length.
Claim 11
Dependent Claim
44 words
The device of claim 6 wherein the Bragg grating is positioned at a distance from an entrance end of the coupler region which is equal to N multiplied by the half-beat-length plus one-half of the half-beat-length, where N is a positive integer or zero.
Claim 12
Dependent Claim
44 words
The device of claim 7 wherein the Bragg grating is positioned at a distance from an entrance end of the coupler region which is equal to N multiplied by the half-beat-length plus one-half of the half-beat-length, where N is a positive integer or zero.
Claim 13
Dependent Claim
19 words
The device of claim 1 which further comprises means for altering the predetermined wavelength band of the coupling region.
Claim 14
Dependent Claim
20 words
The device of claim 1 which further comprises means for altering a band of reflective wavelengths of the Bragg grating.
Claim 15
Dependent Claim
12 words
The device of claim 10 wherein the altering means comprises piezoelectric means.
Claim 16
Dependent Claim
12 words
The device of claim 11 wherein the altering means comprises piezoelectric means.
Claim 17
Independent Claim
218 words
A device for use in coupling light signals having wavelengths in one or more regions at a predetermined wavelength out of or into a transmission system which carries light signals, the device comprising: a first device comprised of a first evanescent wave coupler having a first coupling region formed from two single mode waveguides, wherein the size and spacing of the waveguides in the first coupling region are fabricated having dimensions determined by a condition that the coupling region is sufficiently long for complete evanescent field coupling of light from one waveguide to the other in a first predetermined wavelength band; a Bragg grating disposed in the first coupling region in each of the waveguides; a second device comprised of a second evanescent wave coupler having a second coupling region formed from two single mode waveguides, wherein the size and spacing of the waveguides in the second coupling region are fabricated having dimensions determined by a condition that the coupling region is sufficiently long for complete evanescent field coupling of light from one waveguide to the other in the first predetermined wavelength band; and a Bragg grating disposed in the second coupling region in each of the waveguides; wherein one of the waveguides from the first device is coupled to one of the waveguides from the second device.
Claim 18
Independent Claim
218 words
A device for use in coupling light signals having wavelengths in one or more regions at a predetermined wavelength out of or into a transmission system which carries light signals, the device comprising: a first device comprised of a first evanescent wave coupler having a first coupling region formed from two single mode waveguides, wherein the size and spacing of the waveguides in the first coupling region are fabricated having dimensions determined by a condition that the coupling region is sufficiently long for complete evanescent field coupling of light from one waveguide to the other in a first predetermined wavelength band; a Bragg grating disposed in the first coupling region in each of the waveguides; a second device comprised of a second evanescent wave coupler having a second coupling region formed from two single mode waveguides, wherein the size and spacing of the waveguides in the second coupling region are fabricated having dimensions determined by a condition that the coupling region is sufficiently long for complete evanescent field coupling of light from one waveguide to the other in the first predetermined wavelength band; and a Bragg grating disposed in the second coupling region in each of the waveguides; wherein one of the waveguides from the first device is coupled to one of the waveguides from the second device.
Claim 19
Dependent Claim
41 words
The device of claim 14 wherein the Bragg gratings of the first device are reflective to light having wavelengths in a first region and the Bragg gratings of the second device are reflective to light having wavelengths in the first region.
Claim 20
Dependent Claim
69 words
The device of claim 14 wherein the length of the first coupling region is equal to a distance which provides complete evanescent field coupling of light in the first predetermined band from one waveguide to the other and the length of the second coupling region is equal to a distance which provides complete evanescent field coupling of light in the first predetermined band from one waveguide to the other.
Claim 21
Dependent Claim
60 words
The device of claim 16 wherein: the Bragg grating of the first device is reflective to light having wavelengths in a first region and the Bragg grating of the second device is reflective to light having wavelengths in the first region; and the one of the waveguides from the first device carries light comprised of wavelengths in the first region.
Claim 22
Dependent Claim
63 words
The device of claim 16 wherein: the Bragg grating of the first device is reflective to light having wavelengths in a first region and the Bragg grating of the second device is reflective to light having wavelengths in a second region; and the one of the waveguides from the first device carries light comprised of wavelengths other than wavelengths in the first region.
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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) | 1998-10-09 | 1999-04-10 | 1999-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-09 | 2003-04-10 | 2003-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-09 | 2007-04-10 | 2007-10-10 | $7700.00 | Window Closed / Lapsed |