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New Output Network Design Approach for Voltage-Mode Class-S PAs
/forschung/publikationen/new-output-network-design-approach-for-voltage-mode-class-s-pas
This paper presents a new approach for realizing the output network of class-S power amplifiers in the 900MHz band. The idea is to use bond-wires instead of lumped inductors thus improving Q factor…
Complexity of DPD Linearization in the full RF-Band for a WiMAX Power Amplifier
/forschung/publikationen/complexity-of-dpd-linearization-in-the-full-rf-band-for-a-wimax-power-amplifier
In this paper, the influence of channel frequency in the RF-band on digital predistortion (DPD) is investigated empirically. A class-AB GaN-HEMT power amplifier targeting the 3.5 GHz band for…
Enhancing Dynamic Range and Accuracy of Load-Pull Measurements by Using Prematched Transistors
/forschung/publikationen/enhancing-dynamic-range-and-accuracy-of-load-pull-measurements-by-using-prematched-transistors
This paper describes how dynamic range and accuracy of an on-wafer load pull measurement system can be improved without costly investment in equipment. Applying prematching to the transistors on the…
70 mΩ / 600 V Normally-off GaN Transistors on SiC and Si Substrates
/forschung/publikationen/70-mo-600-v-normally-off-gan-transistors-on-sic-and-si-substrates
The static and dynamic electrical performance of normally-off p-GaN gate AlGaN/GaN HFETs, manufactured on SiC and on Si substrates are compared. By implementing a ptype GaN gate, normally-off…
Coherent combining of two high-brightness laser diodes phase-locked by a Michelson-type external cavity
/forschung/publikationen/coherent-combining-of-two-high-brightness-laser-diodes-phase-locked-by-a-michelson-type-external-cavity
We describe a new coherent beam combining architecture based on the passive phase- locking of two laser diodes in a Michelson external cavity on their rear side, and their coherent combination on…
High brightness narrow-stripe broad-area lasers with 7 W optical output at 910, 935 & 970 nm for coarse spectral beam combining
/forschung/publikationen/high-brightness-narrow-stripe-broad-area-lasers-with-7-w-optical-output-at-910-935-amp-970-nm-for-coarse-spectral-beam-combining
We present the progress of narrow stripe broad area lasers operating at 910, 935 & 970 nm, with P = 7 W and in-plane BPP down to 1.5 mm*mrad from a 30 µm wide stripe.
Timing jitter reduction of a two-section external-cavity semiconductor laser by harmonic mode-locking and optical feedback
/forschung/publikationen/timing-jitter-reduction-of-a-two-section-external-cavity-semiconductor-laser-by-harmonic-mode-locking-and-optical-feedback
Long-term timing jitter reduction of a passively mode-locked external fiber-cavity diode laser by harmonic mode-locking and optical feedback from an auxiliary cavity is experimentally demonstrated…
Spectral broadening of mode-locked semiconductor lasers by resonator-internal pulse shaping
/forschung/publikationen/spectral-broadening-of-mode-locked-semiconductor-lasers-by-resonator-internal-pulse-shaping
In a modelocked semiconductor laser, resonator-internal phase- and amplitude filters are optimized for maximum spectral bandwidth using an evolutionary algorithm. Modes of operation of the laser…
Controllable dual-wavelength-stabilized Y-branch DBR diode lasers at 785 nm for shifted excitation Raman difference spectroscopy
/forschung/publikationen/controllable-dual-wavelength-stabilized-y-branch-dbr-diode-lasers-at-785-nm-for-shifted-excitation-raman-difference-spectroscopy
In this contribution controllable dual-wavelength-stabilized Y-branch DBR diode lasers at 785 nm with an output power of 215 mW and a side-mode-suppression-ratio better 50 dB suitable for shifted…
Array with 24 distributed Bragg reflector lasers for scanning applications: fabrication and characterisation
/forschung/publikationen/array-with-24-distributed-bragg-reflector-lasers-for-scanning-applications-fabrication-and-characterisation
We present a diode laser array with small footprint incorporating 24 individually addressable ridge waveguide DBR lasers. For wavelengths stabilisation around 905 nm we apply 3rd order E-beam defined…