A5007128815- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Optical Network Technologies
- Advanced Photonic Communication Systems
- Semiconductor Lasers and Optical Devices
- Terahertz technology and applications
- Radio Frequency Integrated Circuit Design
- Photonic Crystals and Applications
- Millimeter-Wave Propagation and Modeling
- Photonic Crystal and Fiber Optics
- Microwave Engineering and Waveguides
- Plasmonic and Surface Plasmon Research
- Nonlinear Optical Materials Studies
- Semiconductor materials and devices
- Molecular Communication and Nanonetworks
- Advanced Fiber Optic Sensors
- Nonlinear Optical Materials Research
- Laser-Matter Interactions and Applications
- Cancer Treatment and Pharmacology
- Advanced Optical Sensing Technologies
- Nanofabrication and Lithography Techniques
- Photorefractive and Nonlinear Optics
- Digital Marketing and Social Media
- Laser Material Processing Techniques
- Advanced Power Amplifier Design
Institute of Automation
2024
Karlsruhe Institute of Technology
2015-2022
Photonics (United States)
2019
Efficient electro-optic (EO) modulators crucially rely on advanced materials that exhibit strong activity and can be integrated into high-speed efficient phase shifter structures. In this paper, we demonstrate ultra-high in-device EO figures of merit up to n3r33 = 2300 pm/V achieved in a silicon-organic hybrid (SOH) Mach-Zehnder Modulator (MZM) using the chromophore JRD1. This is highest material-related figure hitherto modulator at any operating wavelength. The {\pi}-voltage 1.5 mm-long...
Three-dimensional (3D) nano-printing of freeform optical waveguides, also referred to as photonic wire bonding, allows for efficient coupling between chips and can greatly simplify system assembly. As a key advantage, the shape trajectory bonds be adapted mode-field profiles positions chips, thereby offering an attractive alternative conventional assembly techniques that rely on technically complex costly high-precision alignment. However, while fundamental advantages bonding concept have...
Electro-optic (EO) modulators rely on the interaction of optical and electrical signals with second-order nonlinear media. For signal, this can be strongly enhanced using dielectric slot–waveguide structures that exploit a field discontinuity at interface between high-index waveguide core low-index EO cladding. In contrast to this, signal is usually applied through conductive regions in direct vicinity waveguide. To avoid excessive loss, conductivity these maintained moderate level, thus...
We report on compact and efficient silicon-organic hybrid (SOH) Mach-Zehnder modulators (MZM) with low phase-shifter insertion loss of 0.7 dB. The 280 µm-long phase shifters feature a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mi>π</mml:mi> </mml:mrow> </mml:math> -voltage-length product 0.41 Vmm loss-efficiency as small aU π L = 1.0 VdB. device performance is demonstrated in data transmission experiment, where we...
Steadily increasing data rates of optical interfaces require spectrally efficient coherent transmission using higher-order modulation formats in combination with scalable wavelength-division multiplexing (WDM) schemes. At the transmitter, frequency combs (OFC) lend themselves to particularly precise multi-wavelength sources for WDM transmission. In this work we demonstrate that these advantages can also be leveraged at receiver by an OFC as a highly local oscillator (LO) detection. our...
Optical frequency combs have the potential to become key building blocks of wavelength-division multiplexing (WDM) communication systems. The strictly equidistant narrow-band spectral lines a comb can serve either as carriers for parallel WDM transmission or local-oscillator (LO) tones coherent reception. When it comes highly scalable transceivers with compact form factor, chip-sale sources are particular interest, and recent experiments demonstrated viability such devices high-speed...
We report on the first demonstration of long-term thermally stable silicon-organic hybrid (SOH) modulators in accordance with Telcordia standards high-temperature storage. The devices rely an organic electro-optic sidechain polymer a high glass transition temperature 172 {\deg}C. In our storage experiments at 85 {\deg}C, we find that activity converges to constant level after initial decay. If consider burn-in time 300 h, {\pi}-voltage increases average by less than 15 % if store for...
Chip-scale frequency comb generators have the potential to become key building blocks of compact wavelength-division multiplexing (WDM) transceivers in future metropolitan or campus-area networks.Among various generator concepts, quantum-dash (QD) mode-locked laser diodes (MLLD) stand out as a particularly promising option, combining small footprint with simple operation by DC current and offering flat broadband spectra.However, data transmission performance achieved QD-MLLD was so far...
We propose a low-complexity digital implementation of the Kramers-Kronig receiver and analyze its performance complexity. In simulations experiments, we find that relatively small number filter taps is sufficient to achieve reasonably high accuracy for phase retrieval reconstruction complex field. show strongly depends on details system design. Unnecessarily broad optical filters decrease reception quality, because additional noise makes violation minimum-phase condition more likely. Narrow...
Photonics might play a key role in future wireless communication systems that operate at THz carrier frequencies.A prime example is the generation of data streams by mixing optical signals high-speed photodetectors.Over previous years, this concept has enabled series transmission experiments record-high rates.Reception these experiments, however, still relied on electronic circuits.In paper, we show receivers can also greatly benefit from optoelectronic signal processing techniques,...
Laser-based light detection and ranging (LiDAR) is key to many applications in science industry. For use cases, compactness power efficiency are key, especially high-volume such as industrial sensing, navigation of autonomous objects, or digitization 3D scenes using hand-held devices. In this context, comb-based systems particular interest, combining high accuracy with measurement speed. However, the technical complexity miniaturized comb sources still prohibitive for applications, when...
We demonstrate coherent WDM transmission using a quantum-dash mode-locked laser diode with resonant feedback. report line rate of 12 Tbit/s (32QAM 60×20 GBd PDM) over 75 km SMF. The spectral efficiency is 7.5 bit/s/Hz.
We demonstrate wireless transmission of QPSK signals at a carrier frequency 0.3 THz using generalized Kramers-Kronig receiver with Schottky barrier diode. achieve line rate 100 Gbit/s over distance 110 m.
We demonstrate Kramers-Kronig reception at a net rate of 267 Gb/s using single high-bandwidth photodiode. propose low complexity DSP implementation, analyze back-to-back performance, and show transmission over up to 300 km.
In this paper, we present a monolithically integrated coherent receiver with on-chip grating couplers, 90° hybrid, photodiodes and transimpedance amplifiers. A gain of 7.7 kΩ was achieved by the An opto-electrical 3 dB bandwidth 34 GHz for in-phase quadrature channel measured. real-time data transmission 64 GBd-QPSK (128 Gb/s) single polarization performed.
Chip-scale frequency comb generators lend themselves as multi-wavelength light sources in highly scalable wavelength-division multiplexing (WDM) transmitters and coherent receivers. Among different options, quantum-dash (QD) mode-locked laser diodes (MLLD) stand out due to their compactness simple operation along with the ability provide a flat broadband spectrum dozens of equally spaced optical tones. However, devices suffer from strong phase noise, which impairs transmission performance...
We demonstrate coherent WDM transmission using a pair of quantum-dash mode-locked laser-diodes – one to generate multitude optical carriers, and another LO tones. transmit line rate 4 Tbit/s (23×45 GBd PDM-QPSK) over 75 km.
Temporal soliton formation in a Kerr-nonlinear optical micro-resonator leads to coherent frequency comb covering the C and L-band. We demonstrate WDM transmission with 94 lines an aggregate data rate of 20 Tbit/s.
Quantum-dash (QD) mode-locked laser diodes (MLLD) lend themselves as chip-scale frequency comb generators for highly scalable wavelength-division multiplexing (WDM) links in future data-center, campus-area, or metropolitan networks.Driven by a simple DC current, the devices generate flat broadband combs, containing tens of equidistant optical tones with line spacings GHz.Here we show that QD-MLLDs can not only be used multi-wavelength light sources at WDM transmitter, but also local...
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., frequency, and phase of laser acting as local oscillator (LO) is one main technical challenges design coherent TDM PONs. In network units (ONUs), low-cost lasers are required, which come at expense wavelength variations drifts over multiple nanometers due to fabrication imperfections, temperature...
Using a frequency comb from quantum-dash mode-locked laser-diode, we transmit line rate of 8.32 Tbit/s (52×40 GBd PDM-QPSK). Isolated lines do not show an additional penalty compared to high-quality ECL.
We demonstrate an eight-channel hybrid multi-chip module comprising InP lasers, silicon photonic modulators, and parallel single-mode fibers, all connected via wire bonds. transmit 28 GBd PAM-4 signals at a total data rate of 448 Gbit/s over 2 km.