Patent US5715265A successfully refreshed from Google Patents.
US5715265A
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Dispersion compensation
Assignee: NORTHERN TELECOM Inc
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Filing: 1996-09-13
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Granted: 1998-02-03
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Expires: 2016-09-13
Abstract
Abstract The emission waveband of a data modulated laser signal is locked to the reflection waveband of a chirped Bragg grating dispersion compensator by means of a phase locked loop regulating the temperature of the laser or the magnitude of the drive current applied to it.
Inventors
- 👤 Richard Edward Epworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:33
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/06; H01S5/068; H01S5/0683; H01S5/0687; G; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/28; G02B6/293; G02B6/29304; G02B6/29316; G02B6/29317; G02B6/29379; G02B6/29392; G02B6/29394
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
A method of locking the emission waveband of a data modulated laser signal with respect to the waveband of a chirped Bragg grating dispersion compensator, wherein an oscillatory signal is employed to impress a frequency modulation upon the data modulated signal to provide an optical input to the dispersion compensator, and wherein a control signal is derived from the light reflected by or transmitted by the chirped grating of the compensator, which control signal is mixed with the oscillatory signal to provide a regulatory signal employed in a feedback control loop to regulate the emission wavelength of the laser.
Claim 2
Independent Claim
99 words
A method of locking the emission waveband of a data modulated laser signal with respect to the waveband of a chirped Bragg grating dispersion compensator, wherein an oscillatory signal is employed to impress a frequency modulation upon the data modulated signal to provide an optical input to the dispersion compensator, and wherein a control signal is derived from the light reflected by or transmitted by the chirped grating of the compensator, which control signal is mixed with the oscillatory signal to provide a regulatory signal employed in a feedback control loop to regulate the emission wavelength of the laser.
Claim 3
Dependent Claim
48 words
A method of locking the emission waveband of a data modulated laser signal with respect to the waveband of a chirped Bragg grating dispersion compensator, which method is as claimed in claim 1, and wherein the grating is apodised to optimise an error signal for varying chirp magnitudes.
Claim 4
Independent Claim
106 words
A method of locking the emission waveband of a data modulated laser signal with respect to the waveband of a chirped Bragg grating dispersion compensator to which that data modulated laser signal is applied, wherein an oscillatory signal is employed to impress a frequency modulation upon the waveband of the chirped Bragg grating of the dispersion compensator, and wherein a control signal is derived from the light reflected by or transmitted by the chirped grating of the compensator, which control signal is mixed with the oscillatory signal to provide a regulatory signal employed in a feedback control loop to regulate the emission wavelength of the laser.
Claim 5
Independent Claim
106 words
A method of locking the emission waveband of a data modulated laser signal with respect to the waveband of a chirped Bragg grating dispersion compensator to which that data modulated laser signal is applied, wherein an oscillatory signal is employed to impress a frequency modulation upon the waveband of the chirped Bragg grating of the dispersion compensator, and wherein a control signal is derived from the light reflected by or transmitted by the chirped grating of the compensator, which control signal is mixed with the oscillatory signal to provide a regulatory signal employed in a feedback control loop to regulate the emission wavelength of the laser.
Claim 6
Dependent Claim
48 words
A method of locking the emission waveband of a data modulated laser signal with respect to the waveband of a chirped Bragg grating dispersion compensator, which method is as claimed in claim 3, and wherein the grating is apodised to optimise an error signal for varying chirp magnitudes.
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) | 2001-02-02 | 2001-08-04 | 2002-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-02-02 | 2005-08-04 | 2006-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-02-02 | 2009-08-04 | 2010-02-03 | $7700.00 | Window Closed / Lapsed |