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2023 Optical Fiber Communications Conference and Exhibition, OFC 2023

作者： Bahmanian, Meysam Fard, Saeed Scheytt, Christoph Paderborn University System and Circuit Technology Group Heinz Nixdorf Institute Paderborn Germany

ISBN: (纸本)9781957171180

In this demo we show an ultra-low phase noise optoelectronic PLL (OEPLL) based on optical clock source. The output signal of this type of PLL is in the electrical domain and its reference oscillator, typically a mode-locked laser, operates in the optical domain. The OEPLL has a frequency range of 2-20 GHz. The OEPLL has an in-band phase noise of below -150 dBc/Hz at 100-kHz offset frequency for a carrier frequency of 10 GHz. This phase noise level is 10-20 dB better than state-of-the-art commercial frequency synthesizers. © 2023 The Author(s).

关键词： Phase locked loops

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Nonlinear Noise Mechanisms in Active Devices: Additive Amplitude Noise and Phase Noise

arXiv

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arXiv 2024年

作者： Bahmanian, Meysam System and Circuit Technology Group Heinz Nixdorf Institute Paderborn University Paderborn33102 Germany

In this report, we lay the foundation for amplitude noise and phase noise analysis in nonlinear devices. We build a theoretical framework that helps us to analyze extremely difficult problems which include both nonlinearity and noise of semiconductors. Using our proposed framework, we analytically calculate the amplitude noise and phase noise of nonlinear RC circuits in the presence of nonlinear capacitance and conductance. As a more practical example, we analyze the amplitude noise and phase noise of a common-emitter stage bipolar transistor. © 2024, CC BY-NC-ND.

关键词： Phase noise

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Increasing the upward radiation efficiency of optical phased arrays using asymmetric silicon horn antennas

Increasing the upward radiation efficiency of optical phased...

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IEEE Photonics Conference (IPC)

作者： H. Farheen S. Joshi J.C. Scheytt V. Myroshnychenko J. Förstner Theoretical Electrical Engineering Paderborn University Paderborn Germany System and Circuit Technology Paderborn University Paderborn Germany

A key challenge in designing efficient optical phased arrays is the lack of a well-designed radiator. This work explores horn antennas numerically optimized to target high upward radiation efficiency to be employed in...

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A 28-Gb/s 27.2mW NRZ Full-Rate Bang-Bang Clock and Data Recovery in 22 nm FD-SOI CMOS technology

A 28-Gb/s 27.2mW NRZ Full-Rate Bang-Bang Clock and Data Reco...

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BiCMOS and Compound Semiconductor Integrated circuits and technology Symposium (BCICTS)

作者： Mohammed Iftekhar Harshan Gowda Pascal Kneuper Babak Sadiye Wolfgang Mueller J. Christoph Scheytt Department of System and Circuit Technology Heinz Nixdorf Institute Paderborn University Paderborn Germany

This paper presents a 28-Gb/s full-rate NRZ bang-bang clock and data recovery (CDR) in 22 nm FD-SOI CMOS technology. In order to reduce supply voltage and power dis-sipation, class-AB current-mode logic (CML) and forward-body biasing (FBB) are extensively used. Furthermore, the clock driver and clock path in the bang-bang phase detector are carefully optimized. The circuit operates reliably in a wide range of supply voltages from 0.8 to 1.2 V without adjustment of the body biasing. The CDR core dissipates 27.2mW at 0.8V supply voltage and 54.4 mW at 1.2 V supply voltage. The recovered full-rate data surpasses jitter tolerance with a good margin (BER less than 10– 12 ) over the entire supply voltage range. A figure-of-merit (FoM) of 0.97 mW/ Gb/s for 0.8 V supply voltage is achieved. This FoM represents the best FoM for full-rate NRZ bang-bang CDRs above 20 Gb/s and compares reasonably well with high-speed half-rate and quarter-rate NRZ CDR FoM $s$ .

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Broadband Mach-Zehnder Modulator with Linear Driver in Electronic-Photonic Co-Integrated Platform

Broadband Mach-Zehnder Modulator with Linear Driver in Elect...

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Integrated Photonics Research, Silicon and Nanophotonics, IPR 2022

作者： Kress, Christian Schwabe, Tobias Rhee, Hanjo Kerman, Sarp Scheytt, J. Christoph Paderborn University Department of Circuit & System Technology Heinz Nixdorf Institute Warburger Str. 100 Paderborn33098 Germany Sicoya GmbH Carl-Scheele-Straße 16 Berlin12489 Germany

ISBN: (纸本)9781557528209

A monolithically integrated electronic-photonic Mach-Zehnder modulator is presented, incorporating electronic linear drivers along photonic components. An electrooptical 3 dB & 6 dB bandwidth of 24 GHz and 34 GHz respectively was measured. The on-chip drivers decrease the Vπ by a factor of 10. © Optica Publishing Group 2022.

关键词： Light modulators

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An Efficient Compact Blazed Grating Antenna for Optical Phased Arrays

arXiv

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arXiv 2023年

作者： Christoph Scheytt, J. Farheen, Henna Joshi, Suraj Myroshnychenko, Viktor Förstner, Jens Paderborn University System and Circuit Technology Fürstenallee 11 Paderborn33102 Germany Paderborn University Theoretical Electrical Engineering Warburger Str. 100 Paderborn33098 Germany

Phased arrays are vital in communication systems and have received significant interest in the field of optoelectronics and photonics, enabling a wide range of applications such as LiDAR, holography, wireless communication, etc. In this work, we present a blazed grating antenna that is optimized to have upward radiation efficiency as high as 80% with a compact footprint of 3.5 µm×2 µm at an operational wavelength of 1.55 µm. Our numerical investigations demonstrate that this antenna in a 64×64 phased array configuration is capable of producing desired far-field radiation patterns. Additionally, our antenna possesses a low side lobe level of -9.7 dB and a negligible reflection efficiency of under 1%, making it an attractive candidate for integrated optical phased arrays. © 2023, CC BY.

关键词： Antenna phased arrays

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Increasing the Field-of-View Radiation Efficiency of Optical Phased Antenna Arrays

arXiv

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arXiv 2023年

作者： Farheen, Henna Strauch, Andreas Scheytt, J. Christoph Myroshnychenko, Viktor Förstner, Jens Paderborn University Theoretical Electrical Engineering Warburger Str. 100 Paderborn33098 Germany Paderborn University System and Circuit Technology Fürstenallee 11 Paderborn33102 Germany

Silicon photonics in conjunction with complementary metal-oxide-semiconductor (CMOS) fabrication has greatly enhanced the development of integrated optical phased arrays. This facilitates a dynamic control of light in a compact form factor that enables the synthesis of arbitrary complex wavefronts in the infrared spectrum. We numerically demonstrate a large-scale two dimensional silicon-based optical phased array (OPA) composed of nanoantennas with circular gratings that are balanced in power and aligned in phase, required for producing elegant radiation patterns in the far-field. For a wavelength of 1.55 µm, we optmize two antennas for the OPA exhibting an upward radiation efficiency as high as 90%, with almost 6.8% of optical power concentrated in the field of view. Additionally, we believe that the proposed OPAs can be easily fabricated and would have the ability of generating complex holographic images, rendering them an attractive candidate for a wide range of applications like LiDAR sensors, optical trapping, optogenetic stimulation and augmented-reality displays. Copyright © 2023, The Authors. All rights reserved.

关键词： Radiation efficiency

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Flexible Time-Domain De-Multiplexing of Nyquist OTDM Channels by Orthogonal Sampling in Silicon Photonics

Flexible Time-Domain De-Multiplexing of Nyquist OTDM Channel...

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CLEO: Science and Innovations, S and I 2022

作者： Misra, Arijit Singh, Karanveer Meier, Janosch Kress, Christian Schwabe, Tobias Preussler, Stefan Scheytt, J. Christoph Schneider, Thomas THz Photonics Group Technische Universität Braunschweig Schleinitzstraße 22 Braunschweig38106 Germany Paderborn University System and Circuit Technology Heinz Nixdorf Institute Fürstenalle 11 Paderborn33098 Germany

We report for the first time, inter-symbol-interference (ISI) free demultiplexing of Nyquist optical time division multiplexed (OTDM) signals using a reconfigurable orthogonal sinc-pulse sampling enabled by silicon ph... 详细信息

ISBN: (纸本)9781557528209

关键词： Silicon photonics

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Photonic analog-to-digital-converters - Comparison of a MZM-sampler with an optoelectronic switched-emitter-follower sampler 21

Photonic analog-to-digital-converters - Comparison of a MZM-...

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21. ITG-Fachtagung Photonische Netze - 21st ITG Conference on Photonic Networks

作者： Weizel, Maxim Kärtner, Franz X. Witzens, Jeremy Scheytt, J. Christoph System and Circuit Technology University of Paderborn Paderborn Germany CFEL DESY Hamburg University Hamburg Germany Institute for Integrated Photonics RWTH Aachen University Aachen Germany

ISBN: (纸本)9783800754243

In this paper two integrated photonic Analog-to-Digital Converter architectures are modeled and simulated. The results are compared in terms of bandwidth, linearity, and jitter performance. The Mach-Zehnder-Modulator based sampler is implemented on system level in Lumerical Interconnect. The effective resolution is dependent on the average optical power, the modulation index, and the applied post-processing. It stays above 7 Bit for a modulation index of m=0.31 up to 20 GHz. The optoelectronic Switched-Emitter-Follower architecture is designed in a 250 nm SiGe BiCMOS photonic process and the post-layout transient noise simulations show an effective resolution of over 7 Bit for an input amplitude of 200 mVpp up to 50 GHz. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach

关键词： Modulation

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Sensory Substitution Device for the Visually Impaired Using 122 GHz Radar and Tactile Feedback

Sensory Substitution Device for the Visually Impaired Using ...

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European Radar Conference (EURAD)

作者： Pascal Kneuper Stephan Kruse Bjoern Luchterhandt Jan Tünnermann Ingrid Scharlau J. Christoph Scheytt Heinz Nixdorf Institute System and Circuit Technology Paderborn University Germany Cognitive Psychology Paderborn University Germany General and Biological Psychology Phillips University Marburg Germany

ISBN: (数字)9782874870613

ISBN: (纸本)9781728170602

This paper presents a 122 GHz Frequency Modulated Continuous Wave (FMCW) radar-based handheld device for sensory substitution for the visually impaired. Distance information from a miniaturized mmWave radar sensor is converted to tactile information by mapping it to an array of vibration actuators. The complete system is integrated into a portable device which is carried in the hand, with the actuators touching the fingertips. A user can explore the environment by combining the distance information provided through the tactile stimulus with the sense of direction gained by pointing the device. This allows to detect obstacles and make evasive manoeuvres to avoid collisions. Experimental results demonstrate that the device is well suited for sensory substitution applications.

关键词： Vibrations Actuators Frequency modulation Handheld computers Radar detection Tactile sensors Sensor arrays

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