摘要:
Die vorliegende Erfindung betrifft eine Vorrichtung zu Erzeugung von Laserstrahlung. Es ist Aufgabe der vorliegenden Erfindung, eine Laserdiode anzugeben, die gleichzeitig einen hohen Wirkungsgrad und eine geringe Fernfelddivergenz aufweist. Der erfindungsgemäßer Diodenlaser umfasst eine Strombarriere (5), dadurch gekennzeichnet, dass sich die Strombarriere (5) entlang einer dritten Achse (X) erstreckt, wobei die Strombarriere (5) mindestens eine Öffnung aufweist, und eine erste Breite (W1) der Öffnung der Strombarriere (5) entlang der dritten Achse (X) kleiner als eine zweite Breite (W2) des metallischen p-Kontaktes (8) entlang der dritten Achse (X) ist.
摘要:
Es wird eine Halbleiterlaserdiode (100) angegeben, die eine durch ein Epitaxieverfahren hergestellte Halbleiterschichtenfolge (2) mit zumindest einer aktiven Schicht (3) aufweist, wobei auf zumindest einem Oberflächenbereich (20) der Halbleiterschichtenfolge (2) eine Gallium-haltige Passivierungsschicht (10) angeordnet ist. Weiterhin wird ein Verfahren zur Herstellung einer Halbleiterlaserdiode (100) angegeben.
摘要:
A quantum cascade laser and its method of fabrication are provided. The quantum cascade laser comprises one or more p-type electrical isolation regions (40) and a plurality of electrically isolated laser sections (10, 12, 16) extending along a waveguide axis of the laser. An active waveguide core (20) is sandwiched between upper (22, 26) and lower (24) n-type cladding layers and the active core and the upper and lower n-type cladding layers extend through the electrically isolated laser sections of the quantum cascade laser. A portion of the upper n-type cladding layer comprises sufficient p-type dopant to have become p-type and to have become an electrical isolation region, which extends across at least a part of the thickness upper n-type cladding layer along a projection separating the sections of the quantum cascade laser.
摘要:
Vorliegend wird eine Halbleiterlaservorrichtung (1) angegeben. Diese umfasst einen ersten Bereich (2), einen zweiten Bereich, der eine ebene Region (4f) und eine aus der ebenen Region herausragende Region (4g) aufweist, und einen aktiven Bereich (3), der zwischen dem ersten (2) und dem zweiten Bereich angeordnet ist, wobei eine Deckschicht (5, 5a, 5b), die ein Halbleitermaterial oder ein transparentes leitendes Oxid enthält, zumindest bereichsweise direkt auf der herausragenden Region (4g) angeordnet ist und die herausragende Region (4g) lateral überragt.
摘要:
The present invention relates to methods for modulating a semiconductor laser and wavelength matching to a wavelength converter using monolithic micro-heaters integrated in the semiconductor laser. According to one embodiment of the present invention, a method of compensating for thermally induced patterning effects, e.g. wavelength drift, in a semiconductor laser is provided where the laser's heating element driving current I H is set to a relatively high magnitude when the laser's driving current I D is at a relatively low magnitude. The heating element driving current I H decreases from said relatively high magnitude to said relatively low magnitude at a time Δt prior to an increase in said laser driving current I D from said relatively low magnitude to said relatively high magnitude. The semiconductor laser may be a DBR laser diode comprising a wavelength selective region (12), a phase matching region (14), and a gain region (16), each region provided with a pair of heating element strips (62,64).
摘要翻译:本发明涉及使用集成在半导体激光器中的单块微型加热器来调制半导体激光器和波长转换器的波长匹配的方法。 根据本发明的一个实施例,一种补偿热诱导图案化效应的方法,例如, 提供了在半导体激光器中,当激光器的驱动电流I SUB相对于激光器的加热元件驱动电流I H H被设定为相对高的幅度时, 低幅度 在所述激光器驱动电流I SUB从所述激光器驱动电流I SUB增加之前的时间Δt,加热元件驱动电流I H H从所述相对高的幅度减小到所述相对低的幅度 相对较低的幅度到相对较高的幅度。 半导体激光器可以是包括波长选择区域(12),相位匹配区域(14)和增益区域(16)的DBR激光二极管,每个区域设置有一对加热元件条(62,64)。
摘要:
A coolerless photonic integrated circuit (PIC), such as a semiconductor electro-absorption modulator/laser (EML) or a coolerless optical transmitter photonic integrated circuit (TxPIC), may be operated over a wide temperature range at temperatures higher then room temperature without the need for ambient cooling or hermetic packaging. Since there is large scale integration of N optical transmission signal WDM channels on a TxPIC chip, a new DWDM system approach with novel sensing schemes and adaptive algorithms provides intelligent control of the PIC to optimize its performance and to allow optical transmitter and receiver modules in DWDM systems to operate uncooled. Moreover, the wavelength grid of the on-chip channel laser sources may thermally float within a WDM wavelength band where the individual emission wavelengths of the laser sources are not fired to wavelength peaks along a standardized wavelength grid but rather may move about with changes in ambient temperature. However, control is maintained such that the channel spectral spacing between channels across multiple signal channels, whether such spacing is periodic or aperiodic, between adjacent laser sources in the thermally floating wavelength grid are maintained in a firmed relationship. Means are then provided at an optical receiver to discover and lock onto floating wavelength grid of transmitted WDM signals and thereafter demultiplex the transmitted WDM signals for OE conversion.
摘要:
The present invention provides a design and method of fabrication of a ridge waveguide structure with vertical gratings enabling weak guiding of light. In weakly guiding waveguide structures only a small portion of light from an optical mode is guided by the waveguide, with majority of the optical mode being present in a material outside of the waveguide structure. The present invention further provides an integrated optical device comprising a weakly guiding ridge waveguide formed on a substrate, said weakly guiding ridge waveguide including a ridge with a vertical grating structure, said weakly guiding ridge waveguide guiding an optical mode substantially beneath the ridge. The waveguide structure with vertical gratings according to the present invention uses materials of appropriate refractive index to provide weak guiding of light. The waveguide structure according to the present invention further enables lateral coupling of light from the waveguide structure to other optical structures that may be placed in a lateral plane that is parallel to the surface of the waveguide structure.
摘要:
A semiconductor self-pulsating laser diode (1) comprises a wave guiding layer (2) sandwiched between lower and upper cladding layers (4, 5). A current blocking layer (8) defining a slot (10) through which pumping current is directed through the laser diode between upper and lower contact plates (5, 6) defines an active wave guiding region (15). The current blocking layer (8) is shaped by the formation of longitudinally extending recesses (12) for defining the active wave guiding region (15) such that a central pulse light generating region (17) is formed surrounded by an outer light propagating region (18). As the laser diode is continuously pumped, an effective step change in refractive index between the wave guiding layer (2) and the outer light propagating region (18) is formed, and the carrier density and refractive index profiles across the active wave guiding region (15) vary as each light pulse cycle progresses.
摘要:
According to the invention, a semiconductor component is produced for the emission of electromagnetic radiation, in particular, light, which is characterised by comprising an active layer for production of radiation, a p contact, electrically connected to the active layer, an n contact, electrically connected to the active layer and a current limiting structure for the definition of a current path, whereby the current limiting structure is provided between the n contact and the active layer.