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US6453093B2
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Tunable optical dispersion-slope compensation based on a nonlinearly-chirped bragg grating
Assignee: CALIFORNIA UNIVERSITY OF SOUTHERN
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Filing: 2001-01-08
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Granted: 2002-09-17
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Expires: 2021-01-08
Abstract
Abstract Techniques for using a nonlinearly-chirped fiber Bragg grating to produce tunable dispersion-slope compensation.
Inventors
- 👤 Yong Xie
- 👤 Sanggeon Lee
- 👤 Zhongqi Pan
- 👤 Alan E. Willner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:52
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/28; G02B6/293; G02B6/29371; G02B6/29374; G02B6/29376; G02B6/29304; G02B6/29316; G02B6/29317; G02B6/29319; G02B6/2932; G02B6/29322; G02B6/29379; G02B6/29392; G02B6/29394; G02B6/29395; H; H04; H04B; H04B10/00; H04B10/25; H04B10/2507; H04B10/2513; H04B10/25133; H04B10/2519; G02B6/02; G02B6/02057; G02B6/02076; G02B6/0208; G02B6/02085; G02B6/02195; G02B6/022
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
76 words
A system, comprising: a fiber grating formed in a fiber and configured to have a spatial grating pattern that changes nonlinearly along said fiber to exhibit up to at least a third-order nonlinear dispersion effect so as to produce a tunable dispersion slope; and a grating control unit coupled to said fiber grating and operable to adjust a grating parameter of said fiber grating to tune both dispersion and dispersion slope produced by said fiber grating.
Claim 2
Independent Claim
76 words
A system, comprising: a fiber grating formed in a fiber and configured to have a spatial grating pattern that changes nonlinearly along said fiber to exhibit up to at least a third-order nonlinear dispersion effect so as to produce a tunable dispersion slope; and a grating control unit coupled to said fiber grating and operable to adjust a grating parameter of said fiber grating to tune both dispersion and dispersion slope produced by said fiber grating.
Claim 3
Dependent Claim
24 words
The system as in claim 1 , wherein said grating control unit includes a fiber stretcher that changes a length of said fiber grating.
Claim 4
Dependent Claim
48 words
The system as in claim 1 , wherein said fiber grating further includes a spatial sampling pattern that is formed in said fiber to overlap and modulate said spatial grating pattern to produce multiple Bragg reflection bands at different band center frequencies each with a tunable dispersion slope.
Claim 5
Dependent Claim
40 words
The system as in claim 3 , wherein said spatial sampling pattern is selected to produce a band spacing between adjacent Bragg reflection bands that is different from a channel spacing between adjacent channels in multiple wavelength-division multiplexed (WDM) channels.
Claim 6
Dependent Claim
30 words
The system as in claim 3 , wherein said spatial sampling pattern is selected to produce a band spacing between adjacent Bragg reflection bands that changes from channel to channel.
Claim 7
Independent Claim
151 words
A system, comprising: a fiber having a receiving end to a plurality of wavelength-division multiplexed (WDM) optical channels with a constant channel spacing in wavelength; a fiber grating formed in said fiber and configured to have a spatial grating pattern that changes nonlinearly along said fiber to exhibit up to at least a third-order nonlinear dispersion effect and a spatial sampling pattern that overlaps with and modulates said spatial grating pattern to produce a plurality of Bragg reflection bands centered at different band center wavelengths that are spaced differently from said constant channel spacing, said fiber grating operable to produce a dispersion slope in each Bragg reflection band that is adjustable when a grating parameter is changed; and a grating control unit coupled to said fiber grating and operable to adjust said grating parameter of said fiber grating to tune both dispersion and said dispersion slope produced by said fiber grating.
Claim 8
Independent Claim
151 words
A system, comprising: a fiber having a receiving end to a plurality of wavelength-division multiplexed (WDM) optical channels with a constant channel spacing in wavelength; a fiber grating formed in said fiber and configured to have a spatial grating pattern that changes nonlinearly along said fiber to exhibit up to at least a third-order nonlinear dispersion effect and a spatial sampling pattern that overlaps with and modulates said spatial grating pattern to produce a plurality of Bragg reflection bands centered at different band center wavelengths that are spaced differently from said constant channel spacing, said fiber grating operable to produce a dispersion slope in each Bragg reflection band that is adjustable when a grating parameter is changed; and a grating control unit coupled to said fiber grating and operable to adjust said grating parameter of said fiber grating to tune both dispersion and said dispersion slope produced by said fiber grating.
Claim 9
Dependent Claim
18 words
The system as in claim 6 , wherein said Bragg reflection bands are evenly spaced from one another.
Claim 10
Dependent Claim
17 words
The system as in claim 6 , wherein said Bragg reflection bands have a varying band spacing.
Claim 11
Dependent Claim
24 words
The system as in claim 6 , wherein said grating control unit includes a fiber stretcher that changes a length of said fiber grating.
Claim 12
Dependent Claim
48 words
The system as in claim 6 , further comprising a dispersion detection unit that is operable to measure dispersion and dispersion slope of each optical channel reflected by said fiber grating, wherein said grating control unit is operable to adjust said fiber grating in response to said measurement.
Claim 13
Independent Claim
153 words
A method, comprising: providing a fiber grating formed in a fiber and configured to have a spatial grating pattern that changes nonlinearly along said fiber to exhibit up to at least a third-order nonlinear dispersion effect and a spatial sampling pattern that overlaps with and modulates said spatial grating pattern to produce a plurality of Bragg reflection bands centered at different band center wavelengths, said fiber grating operable to produce a dispersion slope in each Bragg reflection band that is adjustable when a grating parameter is changed; directing multiple optical channels into said fiber grating where channel wavelengths of different optical channels are respectively in different Bragg reflection bands and are respectively positioned differently with respect to respective band center wavelengths; adjusting a grating parameter of said fiber grating to change dispersion slopes differently at respective different channel wavelengths to negate different dispersions and different dispersion slopes with respect wavelength in different channels.
Claim 14
Independent Claim
153 words
A method, comprising: providing a fiber grating formed in a fiber and configured to have a spatial grating pattern that changes nonlinearly along said fiber to exhibit up to at least a third-order nonlinear dispersion effect and a spatial sampling pattern that overlaps with and modulates said spatial grating pattern to produce a plurality of Bragg reflection bands centered at different band center wavelengths, said fiber grating operable to produce a dispersion slope in each Bragg reflection band that is adjustable when a grating parameter is changed; directing multiple optical channels into said fiber grating where channel wavelengths of different optical channels are respectively in different Bragg reflection bands and are respectively positioned differently with respect to respective band center wavelengths; adjusting a grating parameter of said fiber grating to change dispersion slopes differently at respective different channel wavelengths to negate different dispersions and different dispersion slopes with respect wavelength in different channels.
Claim 15
Dependent Claim
18 words
The method as in claim 11 , wherein said grating parameter includes a length of said fiber grating.
Claim 16
Dependent Claim
45 words
The method as in claim 11 , further comprising: measuring a change in dispersions and dispersion slopes of in said optical channels reflected from said fiber grating; and further adjusting said grating parameter accordingly to negate said change in said dispersions and said dispersion slopes.
Claim 17
Dependent Claim
41 words
The method as in claim 11 , wherein said optical channels transmit through a dispersive fiber system before entering said fiber grating, wherein dispersions and dispersion slopes of said dispersive fiber system are different for different channels and change over time.
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