EP0287360A2
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EP
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An apparatus for driving a semiconductor laser device
Assignee: Sharp Corp
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Filing: 1988-04-13
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Granted: —
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Expires: 2008-04-13
Abstract
Abstract An apparatus for driving a semiconductor laser device (1) wherein the optical output of the laser device is maintained at a predetermined level by means of two feedback control loops (A and B). The apparatus comprises at least two D/A converters (10, 15). One of said D/A converters (10) is used for conducting a coarse adjustment of the optical output level, and another of the D/A converters (15) is used for conducting a fine adjustment of the optical output level.
Inventors
- 👤 Kazuomi Hatanaka
- 👤 Takashi Ohno
- 👤 Kenji Ogou
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 20:54
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/06; H01S5/062; H01S5/06209; H01S5/068; H01S5/0683; H05; H05B; H05B45/00; H05B45/10; H05B45/14; H01S5/04; H01S5/042; H01S5/0617
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
In an apparatus for driving a semiconductor laser device (1) wherein the optical output of said laser device is maintained at a predetermined level by a feedback control, at least two D/A converters (10,15) are provided, one of said D/A converters (10) being used for conducting a coarse adjustment of the optical output level, and another of said D/A converters (15) being used for conducting a fine adjustment of the optical output level.
Claim 2
Dependent Claim
73 words
In an apparatus for driving a semiconductor laser device (1) wherein the optical output of said laser device is maintained at a predetermined level by a feedback control, at least two D/A converters (10,15) are provided, one of said D/A converters (10) being used for conducting a coarse adjustment of the optical output level, and another of said D/A converters (15) being used for conducting a fine adjustment of the optical output level.
Claim 3
Dependent Claim
37 words
An apparatus for driving a semiconductor laser device (1) according to claim 1, wherein at least two feedback loops are formed to conduct the feedback control, and said D/A converters are disposed in said feedback loops, respectively.
Claim 4
Dependent Claim
36 words
In an apparatus for driving a semiconductor laser device (1) comprising a D/A converter (10a) disposed in a feedback loop for controlling the optical output of said laser device, said D/A converter has a non-linear characteristic.
Claim 5
Dependent Claim
36 words
In an apparatus for driving a semiconductor laser device (1) comprising a D/A converter (10a) disposed in a feedback loop for controlling the optical output of said laser device, said D/A converter has a non-linear characteristic.
Claim 6
Dependent Claim
36 words
In an apparatus for driving a semiconductor laser device (1) comprising a D/A converter (10b) disposed in a feedback loop for controlling the optical output of said laser device, said D/A converter provides an offset output.
Claim 7
Dependent Claim
36 words
In an apparatus for driving a semiconductor laser device (1) comprising a D/A converter (10b) disposed in a feedback loop for controlling the optical output of said laser device, said D/A converter provides an offset output.
Claim 8
Dependent Claim
56 words
In an apparatus for driving a semiconductor laser device (1) comprising a D/A converter (10) disposed in a feedback loop for controlling the optical output of said laser device, a current supplying means (4a) is provided separately from said feedback loop, said current supplying means supplying a current of a predetermined level to said laser device.
Claim 9
Dependent Claim
56 words
In an apparatus for driving a semiconductor laser device (1) comprising a D/A converter (10) disposed in a feedback loop for controlling the optical output of said laser device, a current supplying means (4a) is provided separately from said feedback loop, said current supplying means supplying a current of a predetermined level to said laser device.
Claim 10
Dependent Claim
102 words
In an apparatus for driving a semiconductor laser device (1) comprising a D/A converter (10),the input of said D/A converter is connected to a control means 24 for controlling the optical output of said laser device, said control means comprising a memory means in which one or more relations between optical output levels of said laser device and output levels of said control means (24) are previously stored, said control means calculating from said stored relations a level of an output which corresponds to a predetermined optical output level and supplying an output of the calculated level to said D/A converter (10).
Claim 11
Dependent Claim
102 words
In an apparatus for driving a semiconductor laser device (1) comprising a D/A converter (10),the input of said D/A converter is connected to a control means 24 for controlling the optical output of said laser device, said control means comprising a memory means in which one or more relations between optical output levels of said laser device and output levels of said control means (24) are previously stored, said control means calculating from said stored relations a level of an output which corresponds to a predetermined optical output level and supplying an output of the calculated level to said D/A converter (10).
References Cited (Backward Citations)
No citation records indexed.
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