Patent US6266463B1 successfully refreshed from Google Patents.
US6266463B1
Expired / Lapsed
US
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Chirped optical fibre grating
Assignee: Pirelli and C SpA
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Filing: 1998-06-18
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Granted: 2001-07-24
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Expires: 2018-06-18
Abstract
Abstract A method of fabricating a chirped optical fibre grating so that the grating has a predetermined desired wavelength-dependent response across an operational bandwidth comprises apodising the grating so that a degree of apodisation at a longitudinal position along the grating corresponds to the desired response at the optical wavelength reflected at that longitudinal position along the grating.
Inventors
- 👤 Richard Ian Laming
- 👤 Michael Kevan Durkin
- 👤 Valeria Gusmeroli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:40
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/28; G02B6/293; G02B6/29304; G02B6/29316; G02B6/29317; G02B6/02; G02B6/02057; G02B6/02076; G02B6/0208; G02B6/02085; G02B6/29379; G02B6/29392; G02B6/29394
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
65 words
A method of fabricating a chirped optical fibre grating so that the grating has a predetermined desired wavelength-dependent response across an operational bandwidth, the method comprising apodising the grating with an asymmetric apodisation profile so that a degree of apodisation at a longitudinal position along the grating is dependent upon the desired response at the optical wavelength reflected at that longitudinal position along the grating.
Claim 2
Independent Claim
65 words
A method of fabricating a chirped optical fibre grating so that the grating has a predetermined desired wavelength-dependent response across an operational bandwidth, the method comprising apodising the grating with an asymmetric apodisation profile so that a degree of apodisation at a longitudinal position along the grating is dependent upon the desired response at the optical wavelength reflected at that longitudinal position along the grating.
Claim 3
Independent Claim
67 words
A method of fabricating a chirped optical fibre grating having a substantially flat wavelength-dependent response across an operational bandwidth, the method comprising apodising the grating so that a degree of apodisation at a longitudinal position along the grating provides a degree of loss substantially complementary to the degree of loss of the grating before apodisation at the optical wavelength reflected at that longitudinal position along the grating.
Claim 4
Independent Claim
67 words
A method of fabricating a chirped optical fibre grating having a substantially flat wavelength-dependent response across an operational bandwidth, the method comprising apodising the grating so that a degree of apodisation at a longitudinal position along the grating provides a degree of loss substantially complementary to the degree of loss of the grating before apodisation at the optical wavelength reflected at that longitudinal position along the grating.
Claim 5
Dependent Claim
30 words
A method according to claim 1 or claim 2 , in which the operational bandwidth of the grating is such that light reflected by the grating suffers cladding mode losses.
Claim 6
Dependent Claim
10 words
A chirped optical fibre grating having an asymmetric apodisation profile.
Claim 7
Dependent Claim
10 words
A chirped optical fibre grating having an asymmetric apodisation profile.
Claim 8
Dependent Claim
40 words
A chirped optical fibre grating having an apodisation profile varying substantially monotonically across a majority of the length of the grating, in which the degree of apodisation along the grating is substantially linearly related to the pitch of the grating.
Claim 9
Dependent Claim
40 words
A chirped optical fibre grating having an apodisation profile varying substantially monotonically across a majority of the length of the grating, in which the degree of apodisation along the grating is substantially linearly related to the pitch of the grating.
Claim 10
Dependent Claim
118 words
An optical system for receiving an input optical signal and processing the input optical signal with a desired wavelength-dependent response to generate an output optical signal, the system comprising: an optical processing element having a wavelength-dependent response; and a chirped optical fibre grating connected to the optical processing element so that the input optical signal is processed by both the optical processing element and the chirped optical fibre grating to generate the output optical signal; the chirped optical fibre grating having an asymmetric apodisation profile varying with longitudinal position along the grating, so that a combination of the wavelength-dependent response of the apodised grating and the wavelength-dependent response of the optical processing element provides the desired wavelength-dependent response.
Claim 11
Dependent Claim
118 words
An optical system for receiving an input optical signal and processing the input optical signal with a desired wavelength-dependent response to generate an output optical signal, the system comprising: an optical processing element having a wavelength-dependent response; and a chirped optical fibre grating connected to the optical processing element so that the input optical signal is processed by both the optical processing element and the chirped optical fibre grating to generate the output optical signal; the chirped optical fibre grating having an asymmetric apodisation profile varying with longitudinal position along the grating, so that a combination of the wavelength-dependent response of the apodised grating and the wavelength-dependent response of the optical processing element provides the desired wavelength-dependent response.
Claim 12
Dependent Claim
74 words
A system according to claim 6 , in which: the optical processing element has a non-uniform wavelength-dependent response; and the wavelength-dependent response of the apodised grating is substantially complementary to the non-uniform wavelength-dependent response of the optical processing element, so that the combination of the wavelength-dependent response of the apodised grating and the non-uniform wavelength-dependent response of the optical processing element provides a substantially flat wavelength-dependent response across an operational bandwidth of the system.
Claim 13
Dependent Claim
20 words
A system according to claim 6 or claim 7 , in which the optical processing element is an optical amplifier.
Claim 14
Dependent Claim
107 words
An optical source system for generating an output optical signal having a desired output spectrum, the system comprising: an optical source element for generating a source optical signal; and a chirped optical fibre grating connected to the optical source element so that the source optical signal is processed by the chirped optical fibre grating to generate the output optical signal; the chirped optical fibre grating having an asymmetric apodisation profile varying with longitudinal position along the grating, so that a combination of the spectrum of the source optical signal and a wavelength-dependent response of the apodised grating generates the output optical signal having the desired output spectrum.
Claim 15
Dependent Claim
107 words
An optical source system for generating an output optical signal having a desired output spectrum, the system comprising: an optical source element for generating a source optical signal; and a chirped optical fibre grating connected to the optical source element so that the source optical signal is processed by the chirped optical fibre grating to generate the output optical signal; the chirped optical fibre grating having an asymmetric apodisation profile varying with longitudinal position along the grating, so that a combination of the spectrum of the source optical signal and a wavelength-dependent response of the apodised grating generates the output optical signal having the desired output spectrum.
Claim 16
Dependent Claim
76 words
A system according to claim 9 , in which: the source optical signal has a non-uniform spectrum over an operational bandwidth; and the wavelength-dependent response of the apodised grating is substantially complementary to the non-uniform spectrum of the source optical signal so that the combination of the spectrum of the source optical signal and the wavelength-dependent response of the apodised grating generates the output optical signal having a substantially flat output spectrum across the operational bandwidth.
Claim 17
Dependent Claim
21 words
A grating according to claim 4 or 5 , in which the grating is connected in a negative dispersion reflection configuration.
Claim 18
Dependent Claim
19 words
A grating according to claim 4 or 5 , in which the grating is over about 20 centimeters long.
Claim 19
Dependent Claim
22 words
A grating according to claim 4 or 5 , in which the grating has a chirp of at least about 4 nanometers.
Claim 20
Independent Claim
28 words
A system according to any one of claims 6 , 7 , 9 , or 10 in which the grating is connected in a negative dispersion reflection configuration.
Claim 21
Independent Claim
26 words
A system according to any one of claims 6 , 7 , 9 , or 10 in which the grating is over about 20 centimeters long.
Claim 22
Independent Claim
29 words
A system according to any one of claims 6 , 7 , 9 , or 10 in which the grating has a chirp of at least about 4 nanometers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-07-23 | 2005-01-22 | 2005-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-07-23 | 2009-01-22 | 2009-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-07-23 | 2013-01-22 | 2013-07-24 | $7700.00 | Window Closed / Lapsed |