EP1805538A1 - Dbr laserelement mit bragg-gitter hoher ordnung und rippenwellenleiter - Google Patents
Dbr laserelement mit bragg-gitter hoher ordnung und rippenwellenleiterInfo
- Publication number
- EP1805538A1 EP1805538A1 EP05811064A EP05811064A EP1805538A1 EP 1805538 A1 EP1805538 A1 EP 1805538A1 EP 05811064 A EP05811064 A EP 05811064A EP 05811064 A EP05811064 A EP 05811064A EP 1805538 A1 EP1805538 A1 EP 1805538A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- waveguide
- bragg grating
- photoresist layer
- optical element
- rib
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/13—Integrated optical circuits characterised by the manufacturing method
- G02B6/136—Integrated optical circuits characterised by the manufacturing method by etching
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/122—Basic optical elements, e.g. light-guiding paths
- G02B6/124—Geodesic lenses or integrated gratings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/12—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers
- H01S5/125—Distributed Bragg reflector [DBR] lasers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/12—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers
- H01S5/1203—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers over only a part of the length of the active region
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/20—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers
- H01S5/22—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers having a ridge or stripe structure
Definitions
- the invention relates to an optical element having a planar vertical waveguide structure, on the surface of which a Bragg grating and a ridge waveguide are arranged, and to a method for the production thereof.
- Bragg gratings are widely used in optoelectronic components such as lasers, laser amplifiers, filters and couplers. Bragg gratings are characterized by a periodic variation of the refractive index between two values H 1 and r? 2 along a spatial direction, whereby wavelength propagating in the Bragg grating wavelengths selectively reflected or coupled.
- Bragg's grating An important characterizing feature of Bragg's grating is the so-called order m of the grating. This indicates how many half wavelengths form a grating period. Thus, for a 1st order grating, a period equals exactly half a wavelength, for a 2nd order grating a wavelength, etc. Therefore, the size of the grating period is proportional to the grating order.
- Bragg grids can be produced in different ways.
- One possibility is the deposition of a sufficient number of pairs of two materials with different refractive indices.
- the deposition of dielectra can be done for example by CVD (Chemical Vapor Deposition) and is used for example for the production of dielectric mirrors.
- encryption Bond semiconductors can be deposited, for example, with MBE (Molecular Beam Epitaxy) or MOVPE (Metal-Organic Vapor Phase Epitaxy), which can be used to produce so-called Vertical Cavity Surface Emitting Laser (VCSEL) surface emitting lasers.
- MBE Molecular Beam Epitaxy
- MOVPE Metal-Organic Vapor Phase Epitaxy
- a corrugation which has a periodic structure in a spatial direction.
- the use of holographic lithography, electron beam lithography or phase mask lithography is known.
- the structuring is realized for example by etching with acids or reactive ions (RIE ⁇ : Reactive Ion Eching). If the surface thus structured is covered with a material having a different refractive index, the effective refractive index of light waves, which propagate parallel to the boundary surfaces of the layer sequence but perpendicular to the periodic structure, likewise changes periodically, and a Braggsches is again obtained grid.
- the transition regions between the two refractive indices ni and n 2 viewed perpendicular to the surface of the planar vertical waveguide structure, form the so-called grating lines, which are often designed to be straight but also appropriately curved.
- the boundary surface defining the grid between two media having different refractive indices is higher in a certain region of the grating period, namely farther away from the planar vertical waveguide structure. These areas are called webs or grid bars.
- the propagation of the light waves parallel to the layers is enforced by depositing a layer sequence of materials with different refractive indices in such a way that a so-called waveguide is formed, in which the refractive index of the central Layers (so-called waveguide core) is larger than the layers bounding these layers (so-called waveguide cladding).
- This principle of action is utilized, for example, in edge-emitting distributed feedback lasers (DFB lasers, DFB: Distrumped Feedback) or Bragg reflectors (DBR lasers, DBR: distributed Bragg reflector).
- DFB lasers distributed feedback lasers
- DBR lasers distributed Bragg reflector
- a waveguide in the lateral direction in optoelectronic components is typically achieved by a so-called ridge waveguide.
- the rib waveguide like the Bragg grating mentioned above, must be surrounded by a material having a refractive index which is different from the refractive indices of the materials constituting the rib waveguide.
- This material may be, for example, a dielectric (eg air), a metal or a compound semiconductor.
- the layers which form the waveguide cladding can be etched. It is known to carry out the definition of the rib waveguide by means of contact or projection lithography.
- the structuring can be realized by etching with acids or reactive ions (RIE: Reactive Ion Eching). It is also known to also etch a part of the waveguide core or the optically active layer.
- RIE reactive ions
- a disadvantage of the known method according to the prior art is that for generating a Bragg grating with lateral waveguide (Rippen ⁇ waveguide) at predetermined requirements (Reflektiv ⁇ tusch) a variety of process steps is required, which is associated with a considerable cost and Zeit ⁇ effort walk.
- the requirements for the Bragg grating (with rib waveguide) are determined by its application.
- a Bragg grating (with a ridge waveguide) as part of a resonator for a semiconductor laser must in particular meet high reflectivity requirements.
- a Bragg grating with ribbed waveguide arranged on a planar vertical waveguide structure is characterized by:
- a photoresist layer structure on a substantially planar planar vertical waveguide structure, wherein the photoresist layer structure substantially corresponds to the structure of the Bragg grating and the ridge waveguide and is formed in the region of the Bragg grating substantially linear with a ridge width which is at least 70% of the distance corresponds to two adjacent lines, Etching the planar vertical waveguide structure with a photoresist layer structure arranged thereon and
- a simultaneous structuring of Bragg grating and rib waveguide on the planar vertical waveguide structure can advantageously be achieved, as a result of which the number of process steps can be reduced.
- it is provided to form the photoresist layer structure by applying a continuous photoresist layer to the planar vertical waveguide structure, exposing the continuous photoresist layer and developing the photoresist.
- the structuring is then carried out preferably by means of a dry-chemical etching method, such as reactive ion etching or by means of chemically assisted ion beam etching (CAIBE: Chemical Assisted Ion Beam Etching).
- CAIBE Chemical Assisted Ion Beam Etching
- a rib waveguide can be carried out technologically favorable together with a grid of large grating period, the above-mentioned lack of too small grating reflectivity is eliminated.
- Ausu a duty cycle greater than or equal to 0, 8 is selected.
- a duty cycle is chosen greater than or equal to 0.9, which is advantageously accompanied by increased freedom in the design of grid and rib waveguide.
- the extent of the Bragg grating parallel to the surface of the planar vertical waveguide structure and perpendicular to the grating lines is preferably at least 0.01 mm.
- the necessary etching depth to achieve sufficient lateral waveguiding is typically 1000-2000 nm. This makes it possible to use Bragg gratings with an order m> 4, preferably Bragg gratings of FIG Order and order 7th order for semiconductor lasers in the visible or near infrared range.
- a particular advantage of the simultaneous structuring, in addition to the saving of process steps, is that successive processing can be avoided, which generally leads to lithographically more complex problems since, according to previous technology, the subsequent production of ribbed fibers is no longer on perfectly planar surfaces.
- the exposure of the photoresist layer takes place by means of projection lithography.
- the smallest reproducibly definable spatial structure is approximately 400 nm. Therefore, with an i-line wafer stepper for light waves in the visible and near infrared range, only higher-order Bragg gratings (m> 3) can be produced become.
- the etching depth typically has to be 1000-2000 nm and the duty factor must be greater than or equal to 0.9, so that a sufficiently high reflectivity of the Bragg grating is obtained.
- the lithographic step of defining the continuous photoresist pattern has one or more exposures depending on the desired process variability. It is possible to define the rib waveguide and the Bragg grating in different exposure steps. Thus, for example, a mask with different ridge waveguide structures and another mask with Bragg gratings of different lengths and grating periods can be produced beforehand by means of electron beam lithography. The separation of the exposure of Rippenwellenleiter- and lattice structure later makes it very easy to adjust the grating period and the achievable by the variable grating length reflectivity to the respective requirements of the desired device. In addition, optimal exposure parameters for both structures can be selected separately so that, for example, the duty cycle of the grid can be varied. The order of exposure of the grating and ridge-waveguide part can be arbitrarily selected.
- the photoresist layer structure is structured using the nano-printing method.
- an adhesion-promoting or planarizing layer is first applied to the planar vertical waveguide structure to be structured.
- a UV-curable acrylate-based monomer layer of low viscosity is applied in a further step.
- a stamp into which the inverse structure has previously been incorporated with other high resolution techniques is pressed into the latter layer, whereby curing of the material occurs by simultaneous UV irradiation in the area of the stamp and permanently transfers the structures located in the stamp become.
- the generated structure can be directly used as etch masking for the planarization layer and the corresponding planar vertical waveguide structure. It is characteristic that here too the structuring of Bragg grating and ribbed waveguide takes place simultaneously.
- the Bragg grating is preferably arranged next to the rib waveguide or integrated into the rib waveguide.
- the shape of the lines of the Bragg grating is preferably straight. However, it is also possible that these grid lines have curvatures.
- the Bragg gratings can be arranged perpendicularly or obliquely with respect to the axis of the rib waveguide.
- the grating period is preferably constant. Alternatively, however, it is possible to produce a Bragg grating with a variable grating period using some of the known lithographic methods or the nanoprinting method.
- the optical element according to the invention can be used particularly advantageously for the production of lasers with Bragg gratings such as DFB and DBR lasers.
- the optical element according to the invention can furthermore advantageously be used for passive waveguides. Further preferred embodiments of the invention will become apparent from the remaining, mentioned in the dependent claims characteristics.
- FIG. 2 shows an optical element according to the invention as part of a
- Fig. 3 shows an inventive optical element with a in the
- Rib waveguide integrated Bragg grating in a schematic, perspective view
- Fig. 4 shows an inventive optical element with an obliquely ange ⁇ arranged with respect to the longitudinal axis of the rib waveguide Bragg grating in plan view.
- Fig. 1 shows a schematic representation of the individual steps of the method according to the invention. It is initially assumed that a substantially planar planar vertical waveguide structure 1.
- This planar vertical waveguide structure 1 can consist, for example, of n-type GaAs, on which an AIGaAs waveguide structure is epitaxially grown.
- a photoresist layer 2 having a layer thickness of 650 nm is applied to the planar vertical waveguide structure 1 (FIG. 1 a).
- the thickness of the photoresist layer 2 depends on its etch resistance. In principle, it should, because of the low focus depth of the projection exposure and in order to avoid too high an aspect ratio of the paint webs to be as thin as possible.
- the photoresist: 2 is exposed in a wafer stepper which supports exposure wavelengths of 365 nm (i-line) or smaller, exposed in the region of the rib waveguide 6 to be formed and the Bragg grating 5 to be formed.
- the subsequently developed photoresist structure 3 corresponds to the structure of the rib waveguide to be formed and of the lattice to be formed (FIG. 1b). Subsequently, the Bragg grating 5 and ridge waveguide 6 are patterned in one and the same etching step. ( Figure 1c). Thereafter, the Fotolack ⁇ structure 3 is removed (Fig. 1d), so that Bragg grating 5 and rib waveguide 6 are exposed.
- Fig. 2 shows the use of an optical element according to the invention in a resonator of a DBR laser.
- n-GaAs substrate 11 n-waveguide cladding layer 10 [240 nm n- alo . 53 Ga . 47 As], n-waveguide core layer 9 [250 nm n-Alo 5 Ga. 5 As], active zone 8 8nm InGaAs], p-type waveguide core layer 7 [p- Alo. 5 Gao .5 As, with 100nm GaAs contact layer], Bragg grating 5, and ridge waveguide 6) is a typical semiconductor laser structure designed as an edge emitter is.
- the n-side waveguide cladding layer 10, the n-side waveguide cladding layer 9, the active zone as the quantum well, are applied to a GaAs wafer 11 by means of metalorganic vapor phase epitaxy (MOVPE) 8, the p-type waveguide core layer 7, the (unstructured) p-side waveguide cladding layer, which terminates with an (unstructured) highly doped p-GaAs contact layer.
- MOVPE metalorganic vapor phase epitaxy
- the photoresist is then developed.
- the waveguide cladding layer is then patterned by means of reactive ion etching, the regions of the photoresist structure protecting the underlying waveguide cladding layer in such a way that Bragg gratings 5 and rib waveguides 6 are formed there (by merely removing the surrounding regions).
- the etch depth is close to the waveguide core layer 7, or the waveguide core layer 7 is partially patterned; however, the active zone 8 of the laser is not etched. It is advantageous to choose a set of parameters for the dry chemical structuring which produces almost vertical etching flanks, although a slight slope may be favorable in order to produce a staggering duty cycle of at least 0.7, which is hardly feasible over a lithographic step. Calculations show that with a duty factor between 0.9 and 1 the coupling coefficient is maximized and the radiation losses are minimized.
- the structure produced in this way (FIG. 2) can then be processed by conventional methods of semiconductor technology, such as the application of an insulator, the application of the p and n contact to a complete DBR laser.
- the etch depth for grating 5 and ridge waveguide 6 is chosen so that the effective refractive index jump in the case of a pure ridge waveguide laser is optimal for a single-mode operation.
- a part of the waveguide core layer can be etched or a part of the waveguide cladding layer can remain unetched.
- etching process is carried out so that on the one hand the necessary etch depth is achieved and on the other hand it is also ensured that the proportion of the etched area at the bottom of the grid grooves per grating period is ⁇ 30%, in the exemplary embodiment ⁇ 10%.
- Particularly suitable for this purpose are dry chemical etching processes such as reactive ion beam etching (RIE) or chemically assassiated ion beam etching (CAIBE: chemical assisted ion beam etching).
- RIE reactive ion beam etching
- CAIBE chemical assisted ion beam etching
- a parameter set gas chemistry, pressure, power
- wet-chemical etching processes for example with acids which have a good anisotropic etching behavior with respect to the crystal planes, or a combination of wet and dry chemical processes, is conceivable.
- Preferred grating periods ⁇ are in the range of 600 nm and 1500 nm, particularly preferably in the range of 750 nm to 1100 nm.
- the Bragg grating 5 is formed on the lateral flanks of the rib waveguide 6.
- the Bragg grating 5 may in principle extend along the entire Rippenwellen ⁇ conductor 6 or be limited to a part. Alternatively, it is possible for the Bragg grating 5 to be arranged next to the rib waveguide 6.
- the flank angles of the gratings are dependent on the desired etch depth and the adjustable lacquer duty cycle. They are preferably in a range of O 0 - 30 °, more preferably between 4-20 ° with respect to the vertical.
- FIG. 4 shows an optical element according to the invention with a Bragg grating 5 arranged obliquely with respect to the longitudinal axis of the rib waveguide 6 in plan view.
- the Bragg grating 5 is arranged laterally of the rib waveguide 6.
- the grid lines may be arranged at any angle to the propagation direction of the incident wave. In particular, they can run at angles ⁇ with ⁇ ⁇ 90 ° relative to the resonator axis, which can be exploited via multiple Bragg reflections for lateral and longitudinal mode filtering.
- Preferred intervals are 90-0 °, more preferably 88-70 ° and 20-2 °.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- Optical Integrated Circuits (AREA)
- Semiconductor Lasers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410052857 DE102004052857B4 (de) | 2004-10-26 | 2004-10-26 | Optisches Element und Verfahren zu dessen Herstellung |
PCT/EP2005/011656 WO2006045632A1 (de) | 2004-10-26 | 2005-10-26 | Dbr laserelement mit bragg-gitter hoher ordnung und rippenwellenleiter |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1805538A1 true EP1805538A1 (de) | 2007-07-11 |
Family
ID=35840400
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05811064A Withdrawn EP1805538A1 (de) | 2004-10-26 | 2005-10-26 | Dbr laserelement mit bragg-gitter hoher ordnung und rippenwellenleiter |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1805538A1 (de) |
DE (1) | DE102004052857B4 (de) |
WO (1) | WO2006045632A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102385109B (zh) * | 2011-10-28 | 2015-08-19 | 上海华虹宏力半导体制造有限公司 | 光波导耦合结构的制作方法 |
CN103901559B (zh) * | 2012-12-28 | 2017-02-08 | 鸿富锦精密工业(深圳)有限公司 | 光耦合装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2856507A1 (de) * | 1978-12-28 | 1980-07-17 | Amann Markus Christian Dipl In | Halbleiter-laserdiode |
DE3437209A1 (de) * | 1984-10-10 | 1986-04-17 | Siemens AG, 1000 Berlin und 8000 München | Verbesserung zu einem monomoden-diodenlaser |
US6776094B1 (en) * | 1993-10-04 | 2004-08-17 | President & Fellows Of Harvard College | Kit For Microcontact Printing |
EP1001311A1 (de) * | 1998-11-16 | 2000-05-17 | International Business Machines Corporation | Gerät zur Herstellung von Strukturen |
WO2001013480A1 (en) * | 1999-08-13 | 2001-02-22 | Wisconsin Alumni Research Foundation | Single mode, single lobe surface emitting distributed feedback semiconductor laser |
AU2003265243A1 (en) * | 2002-05-30 | 2003-12-19 | Massachusetts Institute Of Technology | Optical waveguide with non-uniform sidewall gratings |
JP4036820B2 (ja) * | 2002-12-18 | 2008-01-23 | インターナショナル・ビジネス・マシーンズ・コーポレーション | サブ波長構造体の製造 |
WO2005011076A1 (en) * | 2003-07-31 | 2005-02-03 | Bookham Technology Plc | Weakly guiding ridge waveguides with vertical gratings |
-
2004
- 2004-10-26 DE DE200410052857 patent/DE102004052857B4/de not_active Expired - Fee Related
-
2005
- 2005-10-26 EP EP05811064A patent/EP1805538A1/de not_active Withdrawn
- 2005-10-26 WO PCT/EP2005/011656 patent/WO2006045632A1/de active Application Filing
Non-Patent Citations (2)
Title |
---|
KIM ET AL.: "1.5 micrometer Wavelength Distributed Feedback Lasers with Deeply Etched First-Order Vertical Grating", JAPANESE JOURNAL OF APPLIED PHYSICS, vol. 40, 15 October 2001 (2001-10-15), pages L1107 - L1109 * |
See also references of WO2006045632A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2006045632A1 (de) | 2006-05-04 |
DE102004052857B4 (de) | 2006-09-07 |
DE102004052857A1 (de) | 2006-06-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE69806895T2 (de) | Monolithische Mehrfachanordnung von oberflächenemittierenden Halbleiterlasern mit vertikalen Resonatoren und unterschiedlichen Wellenlängen | |
DE69936615T2 (de) | Vorrichtung mit einer optischen Funktion, Herstellungsverfahren und optisches Kommunikationssystem | |
EP2190082B1 (de) | Oberflächenemittierende Halbleiterlaserdiode und Verfahren zur Herstellung derselben | |
DE69407312T2 (de) | Integrierte optische Halbleiteranordnung und Herstellungsverfahren | |
DE69115596T2 (de) | Verfahren zur Herstellung einer optischen Halbleitervorrichtung | |
DE3936694C2 (de) | Halbleiterbauteil, insbesondere DFB-Halbleiterlaser | |
DE60304931T2 (de) | Monolithische Mehrwellenlängen Anordnung von Oberflächenemittierenden Lasern mit vertikalem Resonator und Herstellungsverfahren derselben | |
DE69327860T2 (de) | Verbindungshalbleiterbauelement und Verfahren zu seiner Herstellung | |
DE69111197T2 (de) | Abstimmbarer Halbleiterlaser mit verteilter Rückkopplung. | |
DE69811952T2 (de) | Halbleiterlaser mit kinkunterdrückungsschicht | |
DE3306085A1 (de) | Halbleiterlaser | |
DE69220303T2 (de) | Verfahren zur Herstellung eines Halbleiterlasers mit verteilter Rückkoppelung | |
EP1533876B1 (de) | Polarisationskontrolle von Vertikaldiodenlasern durch ein monolithisch integriertes Oberflächengitter | |
EP0671640A2 (de) | Verfahren zur Herstellung eines Gitters für ein optoelektronisches Bauelements | |
DE68910492T2 (de) | Halbleiterlaservorrichtung. | |
DE69203784T2 (de) | Gewinngekoppelter Halbleiterlaser mit verteilter Rückkoppelung. | |
EP1158316B1 (de) | Verwendung eines Beugungsgitters mit hohem Aspektverhältnis | |
DE69801283T2 (de) | Optisches Halbleiterbauelement | |
DE69601380T2 (de) | DFB-Laser mit Verlustkopplung und seine Verwendung | |
EP1158317B1 (de) | Littrow-Gitter sowie Verwendungen eines Littrow-Gitters | |
DE69425835T2 (de) | Laserdiodenelement mit hervorragender Intermodulationsverzerrungscharakteristik | |
EP1805538A1 (de) | Dbr laserelement mit bragg-gitter hoher ordnung und rippenwellenleiter | |
EP0632298A2 (de) | DFB oder DBR Gitter | |
DE602004008096T2 (de) | Steuerung der ausgangsstrahldivergenz in einem halbleiterwellenleiterbauelement | |
EP2942848A1 (de) | Halbleiterlaser sowie verfahren zur herstellung eines halbleiterlasers umfassend ein rückkopplungselement |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20070510 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: FRICKE, JOERG Inventor name: WENZEL, HANS Inventor name: GUETHER, REINER Inventor name: JOHN, WILFRIED Inventor name: ERBERT, GOETZ |
|
17Q | First examination report despatched |
Effective date: 20070830 |
|
DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20151117 |