W. Freude
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View article: Advancing liquid biopsy: whispering gallery mode laser detection of the HER2 cancer biomarker on extracellular vesicles
Advancing liquid biopsy: whispering gallery mode laser detection of the HER2 cancer biomarker on extracellular vesicles Open
We successfully demonstrated a new WGM laser-based approach for detecting the HER2 cancer biomarker on extracellular vesicles (EVs), enabling accurate quantification that outperforms the current gold standard in sensitivity.
View article: Optical arbitrary waveform generation (OAWG) using actively phase-stabilized spectral stitching
Optical arbitrary waveform generation (OAWG) using actively phase-stabilized spectral stitching Open
The conventional way of generating optical waveforms relies on in-phase and quadrature (IQ) modulation of a continuous-wave (CW) laser tone. In this case, the bandwidth of the resulting optical waveform is limited by the underlying electro…
View article: Photonic-electronic arbitrary-waveform generation using quadrature multiplexing and active optical-phase stabilization
Photonic-electronic arbitrary-waveform generation using quadrature multiplexing and active optical-phase stabilization Open
Generation of electrical waveforms with bandwidths of 100 GHz or more is key to many applications in science and industry, comprising high-speed communications, radar, or test and measurement equipment. However, while conventional digital-…
View article: Linear-drive amplifier-less 112 Gbit/s PAM4 operation of a silicon-organic hybrid (SOH) Mach-Zehnder modulator at 265 mV<sub>pp</sub>
Linear-drive amplifier-less 112 Gbit/s PAM4 operation of a silicon-organic hybrid (SOH) Mach-Zehnder modulator at 265 mV<sub>pp</sub> Open
We demonstrate an optically packaged silicon-organic hybrid (SOH) Mach-Zehnder modulator that can be directly driven by industry-standard CMOS SerDes chips without any additional RF amplifiers. In a proof-of-concept experiment we show sign…
View article: Optical Arbitrary Waveform Generation (OAWG) Using Actively Phase-Stabilized Spectral Stitching
Optical Arbitrary Waveform Generation (OAWG) Using Actively Phase-Stabilized Spectral Stitching Open
The conventional way of generating optical waveforms relies on the in-phase and quadrature (IQ) modulation of a continuous wave (CW) laser tone. In this case, the bandwidth of the resulting optical waveform is limited by the underlying ele…
View article: Coherent time- and wavelength-division multiplexed point-to-multipoint optical access network using low-cost DFB lasers enabled by a frequency comb
Coherent time- and wavelength-division multiplexed point-to-multipoint optical access network using low-cost DFB lasers enabled by a frequency comb Open
Coherent reception, along with time- and wavelength-division multiplexing (TWDM), is a promising concept to simultaneously support multiple services in future high-speed point-to-multipoint passive optical networks (PONs). The next-generat…
View article: 185 MHz Count Rate, 139 dB Dynamic Range Single-Photon Avalanche Diode with Active Quenching Circuit in 130 nm CMOS Technology
185 MHz Count Rate, 139 dB Dynamic Range Single-Photon Avalanche Diode with Active Quenching Circuit in 130 nm CMOS Technology Open
Single-photon avalanche diodes with active and passive quenching circuits are fabricated on a 130 nm CMOS platform and analyzed with respect to saturation behavior at high photon rates.
View article: High-Performance Modulators Employing Organic Electro-Optic Materials on the Silicon Platform
High-Performance Modulators Employing Organic Electro-Optic Materials on the Silicon Platform Open
Silicon photonic integrated circuits comprising electro-optic modulators are key to a broad spectrum of applications. However, while the silicon photonics platform takes advantage of the well-established complementary metal-oxide-semicondu…
View article: Non-Sliced Optical Arbitrary Waveform Measurement (OAWM) Using a Silicon Photonic Receiver Chip
Non-Sliced Optical Arbitrary Waveform Measurement (OAWM) Using a Silicon Photonic Receiver Chip Open
Comb-based optical arbitrary waveform measurement (OAWM) techniques can overcome the bandwidth limitations of conventional coherent detection schemes and may have a disruptive impact on a wide range of scientific and industrial application…
View article: Freeform terahertz structures fabricated by multi-photon lithography and metal coating
Freeform terahertz structures fabricated by multi-photon lithography and metal coating Open
Direct-write multi-photon laser lithography (MPL) combines highest resolution on the nanoscale with essentially unlimited 3D design freedom. Over the previous years, the groundbreaking potential of this technique has been demonstrated in v…
View article: Low-Phase-Noise Frequency-Agile Hybrid Integrated Laser Offering Highly Linear Tuning for FMCW LiDAR
Low-Phase-Noise Frequency-Agile Hybrid Integrated Laser Offering Highly Linear Tuning for FMCW LiDAR Open
We demonstrate piezo-tunable hybrid integrated lasers offering linewidths below 100 Hz along with highly linear and fast frequency tuning. For a tuning range of 1 GHz, residual nonlinearities are below 0.07 %, allowing for 5 cm ranging pre…
View article: Integrated Non-sliced OAWM Engine Enabling 320 GHz Photonic-Electronic Analog-to-Digital Conversion
Integrated Non-sliced OAWM Engine Enabling 320 GHz Photonic-Electronic Analog-to-Digital Conversion Open
We demonstrate an optically and electrically packaged silicon photonic receiver system for non-sliced optical arbitrary waveform measurement (OAWM). The OAWM engine is used for high-speed data transmission and for photonic-electronic analo…
View article: Non-sliced Optical Arbitrary Waveform Measurement (OAWM) Using a Silicon Photonic Receiver Chip
Non-sliced Optical Arbitrary Waveform Measurement (OAWM) Using a Silicon Photonic Receiver Chip Open
Comb-based optical arbitrary waveform measurement (OAWM) techniques can overcome the bandwidth limitations of conventional coherent detection schemes and may have disruptive impact on a wide range of scientific and industrial applications.…
View article: Non-sliced optical arbitrary waveform measurement (OAWM) using soliton microcombs
Non-sliced optical arbitrary waveform measurement (OAWM) using soliton microcombs Open
Comb-based optical arbitrary waveform measurement (OAWM) techniques can overcome the bandwidth limitations of conventional coherent detection schemes, thereby enabling ultra-broadband signal acquisition in a wide range of scientific and in…
View article: Slice-Less Optical Arbitrary Waveform Measurement (OAWM) in a Bandwidth of More than 600 GHz Using Soliton Microcombs
Slice-Less Optical Arbitrary Waveform Measurement (OAWM) in a Bandwidth of More than 600 GHz Using Soliton Microcombs Open
We propose and demonstrate a novel scheme for optical arbitrary waveform measurement (OAWM) that exploits chip-scale Kerr soliton combs as highly scalable multiwavelength local oscillators (LO) for ultra-broadband full-field waveform acqui…
View article: Sub-kHz-Linewidth External-Cavity Laser (ECL) With Si<sub>3</sub>N<sub>4</sub> Resonator Used as a Tunable Pump for a Kerr Frequency Comb
Sub-kHz-Linewidth External-Cavity Laser (ECL) With Si<sub>3</sub>N<sub>4</sub> Resonator Used as a Tunable Pump for a Kerr Frequency Comb Open
Combining optical gain in direct-bandgap III-V materials with tunable optical feedback offered by advanced photonic integrated circuits is key to chip-scale external-cavity lasers (ECL), offering wideband tunability along with low optical …
View article: 3D-printed facet-attached microlenses for advanced photonic system assembly
3D-printed facet-attached microlenses for advanced photonic system assembly Open
Wafer-level mass production of photonic integrated circuits (PIC) has become a technological mainstay in the field of optics and photonics, enabling many novel and disrupting a wide range of existing applications. However, scalable photoni…
View article: Ultra-broadband polarisation beam splitters and rotators based on 3D-printed waveguides
Ultra-broadband polarisation beam splitters and rotators based on 3D-printed waveguides Open
Multi-photon lithography has emerged as a powerful tool for photonic integration, allowing to complement planar photonic circuits by 3D-printed freeform structures such as waveguides or micro-optical elements. These structures can be fabri…
View article: Experimental validation of a statistical model of mode-diverse reception in coherent free-space optical communications
Experimental validation of a statistical model of mode-diverse reception in coherent free-space optical communications Open
In this work, we present a statistical model for the turbulent atmospheric channel, which we study using the Monte Carlo method: With the help of the symmetric split-step method, we simulate the effect of the turbulent channel on the compl…
View article: Sub-kHz-linewidth external-cavity laser (ECL) with Si$_{3}$N$_{4}$ resonator used as a tunable pump for a Kerr frequency comb
Sub-kHz-linewidth external-cavity laser (ECL) with Si$_{3}$N$_{4}$ resonator used as a tunable pump for a Kerr frequency comb Open
Combining optical gain in direct-bandgap III-V materials with tunable optical feedback offered by advanced photonic integrated circuits is key to chip-scale external-cavity lasers (ECL), offering wideband tunability along with low optical …
View article: 3D-printed facet-attached optical elements for connecting VCSEL and photodiodes to fiber arrays and multi-core fibers
3D-printed facet-attached optical elements for connecting VCSEL and photodiodes to fiber arrays and multi-core fibers Open
Multicore optical fibers and ribbons based on fiber arrays allow for massively parallel transmission of signals via spatially separated channels, thereby offering attractive bandwidth scaling with linearly increasing technical effort. Howe…
View article: 3D-printed facet-attached optical elements for connecting VCSEL and photodiodes to fiber arrays and multi-core fibers
3D-printed facet-attached optical elements for connecting VCSEL and photodiodes to fiber arrays and multi-core fibers Open
Multicore optical fibers and ribbons based on fiber arrays allow for massively parallel transmission of signals via spatially separated channels, thereby offering attractive bandwidth scaling with linearly increasing technical effort. Howe…
View article: 3D-printed facet-attached optical elements for beam shaping in optical phased arrays
3D-printed facet-attached optical elements for beam shaping in optical phased arrays Open
We demonstrate an optical phased-array equipped with a 3D-printed facet-attached element for shaping and deflection of the emitted beam. The beam shaper combines freeform refractive surfaces with total-internal-reflection mirrors and is in…
View article: Transformation-optics modeling of 3D-printed freeform waveguides
Transformation-optics modeling of 3D-printed freeform waveguides Open
Multi-photon lithography allows us to complement planar photonic integrated circuits (PIC) by in-situ 3D-printed freeform waveguide structures. However, design and optimization of such freeform waveguides using time-domain Maxwell’s equati…
View article: Colorless Coherent TDM-PON Based on a Frequency-Comb Laser
Colorless Coherent TDM-PON Based on a Frequency-Comb Laser Open
Coherent reception becomes an interesting option when data rates in time-division-multiplexed (TDM) passive optical networks (PONs) grow beyond 50 Gbit/s. Controlling the wavelength, i.e., the optical frequency, and the phase of the laser …
View article: 3D-printed facet-attached optical elements for beam shaping in optical phased arrays
3D-printed facet-attached optical elements for beam shaping in optical phased arrays Open
We demonstrate an optical phased-array (OPA) equipped with a 3D-printed facet-attached element for shaping and deflection of the emitted beam. The beam shaper combines freeform refractive surfaces with total-internal-reflection (TIR) mirro…
View article: Transformation-optics modeling of 3D-printed freeform waveguides
Transformation-optics modeling of 3D-printed freeform waveguides Open
Multi-photon lithography allows to complement planar photonic integrated circuits (PIC) by in-situ 3D-printed freeform waveguide structures. However, design and optimization of such freeform waveguides using time-domain Maxwell's equations…