@inproceedings{62270, author = {{Weizel, Maxim and Malavalli Nagaraju, Harshan Gowda and Scheytt, J. Christoph}}, booktitle = {{2025 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium (BCICTS)}}, location = {{Phoenix, Arizona, USA}}, publisher = {{IEEE}}, title = {{{A 128 GS/s 2x Time-Interleaved Track and Hold Amplifier in 130nm SiGe BiCMOS}}}, doi = {{10.1109/bcicts63111.2025.11211462}}, year = {{2025}}, } @inproceedings{62271, author = {{Weizel, Maxim and Gudyriev, Sergiy and Zazzi, Andrea and Müller, Juliana and Schwabe, Tobias and Witzens, Jeremy and Scheytt, J. Christoph}}, booktitle = {{2025 32nd IEEE International Conference on Electronics, Circuits and Systems (ICECS)}}, location = {{Marrakesh, Morocco}}, publisher = {{IEEE}}, title = {{{High Voltage (5Vpp) Driver Monolithically Integrated with Thermally Tunable Optical Ring Resonators in a Silicon Photonics Technology}}}, doi = {{10.1109/ICECS66544.2025.11270577}}, year = {{2025}}, } @misc{59071, author = {{Weizel, Maxim and Scheytt, J. Christoph}}, publisher = {{Zenodo}}, title = {{{Photonically Assisted Sampling Circuits}}}, doi = {{10.5281/ZENODO.14990093}}, year = {{2024}}, } @article{34230, abstract = {{We present the design and experimental characterization of a silicon nitride pulse interleaver based on coupled resonator optical waveguide filters. In order to achieve a targeted free spectral range of 1.44 THz, which is large given the reduced optical confinement of the silicon nitride platform, individual ring resonators are designed with tapered waveguides. Its application to time-interleaved photonically-assisted ADCs is analyzed by combining experimental characterization of the photonic integrated circuit with a comprehensive model of the entire ADC. The impact of fundamental signal distortion and noise sources affecting the converter is investigated and suitable equalization techniques at the digital signal processing level are evaluated. The novel application of a simple but powerful equalization filter in the DSP domain allows for a significant improvement of the digitized signal SNR. An ENOB of 5 over a 75 GHz bandwidth (150 GS/s) and an ENOB of 4.3 over a 100 GHz bandwidth (200 GS/s) are expected to be achievable with compact and off-the-shelf single-section semiconductor mode locked lasers, that can be further improved with lower noise light sources.}}, author = {{Zazzi, Andrea and Müller, Juliana and Ghannam, Ibrahim and Battermann, Moritz and Rajeswari, Gayatri Vasudevan and Weizel, Maxim and Scheytt, J. Christoph and Witzens, Jeremy}}, issn = {{1094-4087}}, journal = {{Optics Express}}, number = {{3}}, publisher = {{Optica Publishing Group}}, title = {{{Wideband SiN pulse interleaver for optically-enabled analog-to-digital conversion: a device-to-system analysis with cyclic equalization}}}, doi = {{10.1364/oe.441406}}, volume = {{30}}, year = {{2022}}, } @article{29209, abstract = {{We demonstrate an optical arbitrary waveform measurement (OAWM) system that exploits a bank of silicon photonic (SiP) frequency-tunable coupled-resonator optical waveguide (CROW) filters for gapless spectral slicing of broadband optical signals. The spectral slices are coherently detected using a frequency comb as a multi-wavelength local oscillator (LO) and stitched together by digital signal processing (DSP). For high-quality signal reconstruction, we have implemented a maximum-ratio combining (MRC) technique based on precise calibration of the complex-valued opto-electronic transfer functions of all detection paths. In a proof-of-concept experiment, we demonstrate the viability of the scheme by implementing a four-channel system that offers an overall detection bandwidth of 140 GHz. Exploiting a femtosecond laser with precisely known pulse shape for calibration along with dynamic amplitude and phase estimation, we reconstruct 100 GBd QPSK, 16QAM and 64QAM optical data signals. The reconstructed signals show improved quality compared to that obtained with a single high-speed intradyne receiver, while the electronic bandwidth requirements of the individual coherent receivers are greatly reduced.}}, author = {{Fang, Dengyang and Zazzi, Andrea and Müller, Juliana and Dray, Daniel and Fullner, Christoph and Marin-Palomo, Pablo and Tabatabaei Mashayekh, Alireza and Dipta Das, Arka and Weizel, Maxim and Gudyriev, Sergiy and Freude, Wolfgang and Randel, Sebastian and Scheytt, J. Christoph and Witzens, Jeremy and Koos, Christian}}, issn = {{0733-8724}}, journal = {{Journal of Lightwave Technology}}, keywords = {{Atomic and Molecular Physics, and Optics}}, pages = {{1--1}}, publisher = {{Institute of Electrical and Electronics Engineers (IEEE)}}, title = {{{Optical Arbitrary Waveform Measurement Using Silicon Photonic Slicing Filters}}}, doi = {{10.1109/jlt.2021.3130764}}, year = {{2021}}, } @article{29211, abstract = {{Electrical-optical signal processing has been shown to be a promising path to overcome the limitations of state-of-the-art all-electrical data converters. In addition to ultra-broadband signal processing, it allows leveraging ultra-low jitter mode-locked lasers and thus increasing the aperture jitter limited effective number of bits at high analog signal frequencies. In this paper, we review our recent progress towards optically enabled time- and frequency-interleaved analog-to-digital converters, as well as their monolithic integration in electronic-photonic integrated circuits. For signal frequencies up to 65 GHz, an optoelectronic track-and-hold amplifier based on the source-emitter-follower architecture is shown as a power efficient approach in optically enabled BiCMOS technology. At higher signal frequencies, integrated photonic filters enable signal slicing in the frequency domain and further scaling of the conversion bandwidth, with the reconstruction of a 140 GHz optical signal being shown. We further show how such optically enabled data converter architectures can be applied to a nonlinear Fourier transform based integrated transceiver in particular and discuss their applicability to broadband optical links in general.}}, author = {{Zazzi, Andrea and Müller, Juliana and Weizel, Maxim and Koch, Jonas and Fang, Dengyang and Moscoso-Martir, Alvaro and Tabatabaei Mashayekh, Ali and Das, Arka D. and Drays, Daniel and Merget, Florian and Kartner, Franz X. and Pachnicke, Stephan and Koos, Christian and Scheytt, J. Christoph and Witzens, Jeremy}}, issn = {{2644-1349}}, journal = {{IEEE Open Journal of the Solid-State Circuits Society}}, pages = {{209--221}}, publisher = {{Institute of Electrical and Electronics Engineers (IEEE)}}, title = {{{Optically Enabled ADCs and Application to Optical Communications}}}, doi = {{10.1109/ojsscs.2021.3110943}}, volume = {{1}}, year = {{2021}}, } @article{29212, author = {{Fang, Dengyang and Zazzi, Andrea and Müller, Juliana and Daniel, Drayß and Füllner, Christoph and Marin-Palomo, Pablo and Mashayekh, Ali Tabatabaei and Das, Arka Dipta and Weizel, Maxim and Gudyriev, Sergiy and Freude, Wolfgang and Randel, Sebastian and Scheytt, J. Christoph and Witzens, Jeremy and Koos, Christian}}, isbn = {{978-1-943580-86-6}}, journal = {{OSA Technical Digest}}, title = {{{Optical Arbitrary Waveform Measurement (OAWM) on the Silicon Photonic Platform}}}, doi = {{10.1109/JLT.2021.3130764}}, year = {{2021}}, } @article{23476, author = {{Weizel, Maxim and Scheytt, J. Christoph and Kärtner, Franz X. and Witzens, Jeremy}}, issn = {{1094-4087}}, journal = {{Optics Express}}, title = {{{Optically clocked switched-emitter-follower THA in a photonic SiGe BiCMOS technology}}}, doi = {{10.1364/oe.425710}}, year = {{2021}}, } @inproceedings{23479, author = {{Weizel, Maxim and Kaertner, Franz X. and Witzens, Jeremy and Scheytt, J. Christoph}}, booktitle = {{Photonic Networks; 21th ITG-Symposium}}, location = {{Online}}, pages = {{1--6}}, publisher = {{VDE}}, title = {{{Photonic Analog-to-Digital-Converters – Comparison of a MZM-Sampler with an Optoelectronic Switched-Emitter-Follower Sampler}}}, year = {{2020}}, }