Infineon Technologies Ag

Avago Technologies Fiber IP (singapore) Pte. Ltd

Lantiq Deutschland Gmbh

Lantiq Beteiligungs Gmbh & Co. Kg

Gunther Steinle

Hans-Dietrich Wolf

Christian Jenkner

Hans-Ludwig Althaus

Karl Schrödinger

Martin Weigert

Hans Hurt

Josef Wittl

Thomas Lichtenegger

Stephan Prucker

Gustav Müller

Joachim Pfeiffer

A laser control device comprises a driver circuitry for supplying a drive current to a laser diode (LD). The device further comprises a digital storage for storing drive current values for a plurality of temperature conditions, and a central processing unit coupled to the digital storage for controlling the driver circuitry in accordance with the drive current values from said digital storage. The central processing unit is configured for multiple updating the drive current values stored in the digital storage.

Laser diode control device

Methods and apparatuses include operating a semiconductor component using a DC/DC-converter. The DC/DC-converter has its duty cycle controlled. A voltage at the semiconductor component is sensed for a voltage. The duty cycle is controlled or regulated so that the sensed voltage corresponds to a predetermined voltage. The predetermined voltage may be gradually increased until a difference between the sensed voltage and the predetermined voltage reaches a predetermined limit.

Operating a semiconductor component having a breakthrough voltage

The invention relates to a method and a device for operating an optical transmitting device having a plurality of optical transmitters that can be driven independently. The method includes detecting the parameter values of the individual transmitters, comparing the parameter values determined with one another and/or with a prescribed comparison value, and selecting one of the transmitters for the communication operation of the transmitting device based on the comparison. The method further includes operating the transmitting device with the selected transmitter.

Method and device for operating an optical transmitting device having a plurality of optical transmitters that can be driven independently

A method for producing an emission module having at least two vertically emitting lasers in which an optically active laser layer is arranged on a substrate and at least one upper covering layer is arranged on said laser layer. In a first etching step, upper mesa regions are formed by etching the upper covering layer, wherein the etching depth of the first etching step is chosen such that the first etching step is ended above the optically active laser layer, and the first etching step is carried out such that the resulting distance between adjacent upper mesa regions is so small that the radiation generated by the finished lasers can be coupled directly into a single optical waveguide. In a second etching step, the optically active layer is severed to form lower mesa regions, the second etching step being a wet-chemical or dry-chemical etching step with a predominantly chemical etching component.

Method for producing an optical emission module having at least two vertically emitting lasers

The invention relates to a laser diode including a vertical resonator and to a method for producing the laser diode such that at least one active layer is configured between reflective layers. The invention is characterized by configuring at least one antioxidation layer between the reflective layers, thus preventing distortion caused by unintentional oxidation. The antioxidation layer consists of a III&#x2013;V semiconductor material with a proportion of a molar aluminum of less than 0.7 and/or a III&#x2013;V semiconductor material with an optical depth of at least two quarter waves.

Laser diode with vertical resonator and method for fabricating the diode

A laser device has a laser diode with an optical resonator. The resonator has an exit side for emitting light into an optical system. A monitor diode is provided and has a light-sensitive face for measuring optical quantities of the laser diode. The light-sensitive face of the monitor diode is optically coupled to a backside of the laser diode, on the other side from the light exit side of the resonator, the backside also emitting light. This configuration permits a space-saving SMD layout for the laser device.

Laser device

Electroabsorption modulator () having a layer sequence of at least five sequential layers, having at least one light absorption layer () which is arranged between the first layer () and the third layer () and is set up to generate charge carriers upon irradiation of light () of a specific wavelength, and having at least one storage layer () which is arranged between the third layer () and the fifth layer () and is set up to store charge carriers.

Electroabsorption modulator, modulator laser device and method for producing an electroabsorption modulator

A VCSEL has an active layer, a photodetector in one of the DBR gratings and with a radiation-absorbing layer that is arranged in an antinode of a laser mode. The laser and the photodetector are electrically driven by a common contact on a thick, heavily doped spacer layer that ensures low laser impedance and little electrical crosstalk between the laser and the photodetector.

Growing community of inventors

Munich, Germany

Gunther Steinle