Patent US6233262B1 successfully refreshed from Google Patents.
US6233262B1
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Device and method for monitoring and controlling laser wavelength
Assignee: ECI Telecom Ltd
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Filing: 1998-08-10
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Granted: 2001-05-15
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Expires: 2018-08-10
Abstract
Abstract A device and method for monitoring and controlling the wavelength of a semiconductor laser having an adjustable wavelength, the device including a wavelength filter including a medium-dense wavelength division demultiplexer (WDM) arranged to receive a portion of the laser power of the laser and divide it between two filter outputs, a photoreceiver arranged to measure the output power at each filter output, a processor coupled to the photoreceivers and arranged to compute the ratio of power at the two filter outputs, apparatus to compare the computed ratio with a predetermined reference ratio, and apparatus to adjust the wavelength of the laser in response to the comparison.
Inventors
- 👤 Michael Mesh
- 👤 Yossi Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:50
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/06; H01S5/068; H01S5/0683; H01S5/0687; H01S5/0617
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
A device for monitoring and controlling the wavelength of a semiconductor laser having an associated wavelength regulator, the device comprising: (a) a wavelength filter including a medium-dense wavelength division demultiplexer (WDM) arranged to receive a portion of the laser output power of the laser and divide it between two filter outputs; (b) a photoreceiver arranged to measure the power at each said filter output; (c) a processor arranged to compute the ratio of power at said two filter outputs; (d) means for comparing said computed ratio with a predetermined reference ratio; and (e) means for adjusting the wavelength of the laser in response to said comparison.
Claim 2
Independent Claim
106 words
A device for monitoring and controlling the wavelength of a semiconductor laser having an associated wavelength regulator, the device comprising: (a) a wavelength filter including a medium-dense wavelength division demultiplexer (WDM) arranged to receive a portion of the laser output power of the laser and divide it between two filter outputs; (b) a photoreceiver arranged to measure the power at each said filter output; (c) a processor arranged to compute the ratio of power at said two filter outputs; (d) means for comparing said computed ratio with a predetermined reference ratio; and (e) means for adjusting the wavelength of the laser in response to said comparison.
Claim 3
Dependent Claim
30 words
The device of claim 1 , wherein said WDM filter has a spectral range of about 40 nm around 1550 nm, and is centered at a wavelength within this range.
Claim 4
Dependent Claim
41 words
The device of claim 1 , wherein said means for adjusting the wavelength includes a temperature controller associated with the laser, and means in said processor to activate said temperature controller until said computed ratio substantially equals said predetermined reference ratio.
Claim 5
Dependent Claim
41 words
The device of claim 2 , wherein said means for adjusting the wavelength includes a temperature controller associated with the laser, and means in said processor to activate said temperature controller until said computed ratio substantially equals said predetermined reference ratio.
Claim 6
Independent Claim
118 words
A method for monitoring and controlling the wavelength of a semiconductor laser whose wavelength is adjustable, the method including the steps of: (a) feeding a portion of the laser output power of the laser to a wavelength filter including a wavelength division demultiplexer (WDM) arranged to receive the laser output power and divide it between two filter outputs; (b) measuring the power at each filter output; (c) computing the ratio of said measured power at said two filter outputs; (d) comparing said computed ratio with a predetermined reference ratio; (e) adjusting the wavelength of the laser in response to said comparison; and (f) repeating steps (b) through (e) until said computed ratio substantially equals said predetermined reference ratio.
Claim 7
Independent Claim
118 words
A method for monitoring and controlling the wavelength of a semiconductor laser whose wavelength is adjustable, the method including the steps of: (a) feeding a portion of the laser output power of the laser to a wavelength filter including a wavelength division demultiplexer (WDM) arranged to receive the laser output power and divide it between two filter outputs; (b) measuring the power at each filter output; (c) computing the ratio of said measured power at said two filter outputs; (d) comparing said computed ratio with a predetermined reference ratio; (e) adjusting the wavelength of the laser in response to said comparison; and (f) repeating steps (b) through (e) until said computed ratio substantially equals said predetermined reference ratio.
References Cited (Backward Citations)
US5299212A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-05-14 | 2004-11-13 | 2005-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-05-14 | 2008-11-13 | 2009-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-05-14 | 2012-11-13 | 2013-05-15 | $7700.00 | Window Closed / Lapsed |