US4815081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for controlling or regulating an emission wavelength and emitted power of a semiconductor laser
Assignee: Siemens AG
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Filing: 1988-03-23
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Granted: 1989-03-21
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Expires: 2008-03-23
Abstract
Abstract An arrangement for controlling or regulating the emission wavelength and emitted optical power of a semiconductor laser is provided in optically integrated fashion. The optical power of the laser is at least partially supplied to an optical detector device and to a wavelength selective optical filter device. That part of the supplied power which passes through the filter device is conducted to another opto-electrical detector device. As a result of the two diodes, the optical power and the emission wavelength of the laser are simultaneously measured, whereby two control signals for the injection current of the laser are obtained.
Inventors
- 👤 Hans Mahlein
- 👤 Reinhard Maerz
- 👤 Meinrad Schienle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:29
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/06; H01S5/068; H01S5/0683; H01S5/0687; H01S5/02; H01S5/026; H01S5/0262; H01S5/0264
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
94 words
An arrangement for controlling or regulating an emission wavelength and emitted optical power of a semiconductor laser, comprising: first and second opto-electrical detector devices; a wavelength selective optical filter device; means for conducting at least part of said optical power of said semiconductor laser to said first opto-electrical detector device and said wavelength-selective optical filter device; and means for supplying a part of said emitted optical power to said second opto-electrical detector device, said part of said emitted optical power being reflected from or permitted to pass by said wavelength selective optical filter device.
Claim 2
Dependent Claim
94 words
An arrangement for controlling or regulating an emission wavelength and emitted optical power of a semiconductor laser, comprising: first and second opto-electrical detector devices; a wavelength selective optical filter device; means for conducting at least part of said optical power of said semiconductor laser to said first opto-electrical detector device and said wavelength-selective optical filter device; and means for supplying a part of said emitted optical power to said second opto-electrical detector device, said part of said emitted optical power being reflected from or permitted to pass by said wavelength selective optical filter device.
Claim 3
Dependent Claim
32 words
An arrangement as claimed in claim 1, wherein said wavelength selective optical filter device has a transmission curve having a change over a defined wavelength region into which said emission wavelength falls.
Claim 4
Dependent Claim
26 words
An arrangement as claimed in claim 2, wherein said transmission curve of said wavelength selective optical filter device has a peak in said defined wavelength region.
Claim 5
Dependent Claim
29 words
An arrangement as claimed in claim 3, wherein said peak of said transmission curve of said wavelength selective optical filter device corresponds to at least a relative transmission maximum.
Claim 6
Dependent Claim
23 words
An arrangement as claimed in claim 1, wherein said wavelength selective optical filter device is composed of at least one optical filter element.
Claim 7
Dependent Claim
33 words
An arrangement as claimed in claim 5, wherein said at least one optical filter element is a plurality of individual optical filter elements disposed successively in a propagation direction of said optical power.
Claim 8
Dependent Claim
18 words
An arrangement as claimed in claim 6, wherein said plurality of individual optical filter elements are Bragg gratings.
Claim 9
Dependent Claim
20 words
An arrangement as claimed in claim 8, wherein at least one of said Bragg gratings have a varying grating constant.
Claim 10
Dependent Claim
19 words
An arrangement as claimed in claim 5 wherein said at least one optical filter element is a Bragg grating.
Claim 11
Dependent Claim
17 words
An arrangement as claimed in claim 7, wherein said Bragg grating has a varying grating constant. constant.
Claim 12
Dependent Claim
66 words
An arrangement as claimed in claim 5, wherein said at least one optical filter element of said wavelength selective optical filter device comprises first and second Bragg gratings disposed successively in a propagation direction of said optical power, said first and second Bragg gratings being spaced from one another by a distance substantially equaling a whole multiple of half an optical wavelength of said optical power.
Claim 13
Dependent Claim
18 words
An arrangement as claimed in claim 1, wherein said wavelength selective optical filter device is a directional coupler.
Claim 14
Dependent Claim
16 words
An arrangement as claimed in claim 12, wherein said directional coupler is a co-directional directional coupler.
Claim 15
Dependent Claim
16 words
An arrangement as claimed in claim 12, wherein said directional coupler is a contra-directional directional coupler.
Claim 16
Dependent Claim
18 words
An arrangement as claimed in claim 1, wherein said wavelength selective optical filter device is an interference filter.
Claim 17
Dependent Claim
130 words
An arrangement as claimed in claim 1, wherein said wavelength selective optical filter device is a first optical filter device, and further comprising: at least a second optical filter device disposed side-by-side with said first optical filter device; means for supplying portions of said optical power in parallel to said first and said at least second optical filter devices; a different one of said opto-electrical detector devices allocated to each of said first and said at least second optical filter devices; and means for conducting parts of said supplied portions of said optical power to said different ones of said opto-electrical detector devices, said parts of said supplied portions being reflected from or permitted to pass by allocated ones of said first and said at least second optical filter devices.
Claim 18
Dependent Claim
38 words
An arrangement as claimed in claim 16, wherein said first and said at least second optical filter devices have different transmission curves having changes in different wavelength regions that follow one another in a direction of increasing wavelength.
Claim 19
Dependent Claim
23 words
An arrangement as claimed in claim 17, wherein said different wavelength regions of said optical filter devices are at least adjacent one another.
Claim 20
Dependent Claim
20 words
An arrangement as claimed in claim 18, wherein said different wavelength regions of said optical filter devices overlap one another.
Claim 21
Dependent Claim
61 words
An arrangement as claimed in claim 1, wherein said first opto-electrical detector device is partially transmissive so that a transmitted part of said part of said optical power conducted to said first detector device by said means for conducting is passed through said first detector device; and second means for conducting said transmitted part to said wavelength selective optical filter device.
Claim 22
Dependent Claim
52 words
An arrangement as claimed in claim 20, wherein said semiconductor laser emits optical power to two sides, part of said optical power from one of said two sides being taken as output power, and said arrangement being connected to receive part of said optical power from a second of said two sides.
Claim 23
Dependent Claim
23 words
An arrangement as claimed in claim 22, wherein said partially transmissive detector device absorbs more than 95% of optical power conducted to it.
Claim 24
Dependent Claim
28 words
An arrangement as claimed in claim 20, wherein at least said second detector device is transmissive, and means for taking out power from said transmissive second detector device.
Claim 25
Dependent Claim
52 words
An arrangement as claimed in claim 1, wherein said semiconductor laser emits optical power to two sides, part of said optical power from one of said two sides being taken as output power, and said arrangement being connected to receive part of said optical power from a second of said two sides.
Claim 26
Dependent Claim
26 words
An arrangement as claimed in claim 1, further comprising: at least one optical waveguide conducting said optical power to said filter device and said detector devices.
Claim 27
Dependent Claim
45 words
An arrangement as claimed in claim 25, wherein said detector devices are photodiodes, said at least one optical waveguide is a strip waveguide, and said semiconductor laser and said filter device and said detector devices and said strip waveguide are integrated on a common substrate.
Claim 28
Dependent Claim
87 words
An arrangement as claimed in claim 25 wherein said at least one waveguide is a branched waveguide, and further comprising: a first waveguide branch of said branched waveguide connected to receive said output power from said semiconductor laser; a second waveguide branch of said branched waveguide conducting a second wavelength to one of said detector devices, said second wavelength differs from said emission wavelength; and a second filter device preceding said one detector device, said second filter device blocking said emission wavelength and passing said second wavelength.
Claim 29
Dependent Claim
16 words
An arrangement as claimed in claim 27, wherein said branched waveguide is a forked strip waveguide.
Claim 30
Dependent Claim
88 words
An arrangement as claimed in claim 1, wherein said first detector device produces a first output signal which is connected to control or regulate said emitted power of said semiconductor laser; said second detector device producing a second output signal; and further comprising: a amplifier connected to receive said first and second output signals, said amplifier providing an amplifier output signal which is proportional to a quotient of said first and second output signals, said amplifier output signal connected to control said emission wavelength of said semiconductor laser.
Claim 31
Dependent Claim
26 words
An arrangement as claimed in claim 29, further a variable voltage divider device connected between one of said first and second detector devices and said amplifier.
Claim 32
Dependent Claim
25 words
An arrangement as claimed in claim 30, further comprising: an inverter connectable between another one of said first and second detector devices and said amplifier.
Claim 33
Dependent Claim
24 words
An arrangement as claimed in claim 29, further comprising: an inverter connectable between one of said first and second detector devices and said amplifier.
References Cited (Backward Citations)
US4672457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |