A5049091580- Optical Network Technologies
- Advanced Photonic Communication Systems
- Semiconductor Lasers and Optical Devices
- Advanced Optical Network Technologies
- Photonic and Optical Devices
- Power Line Communications and Noise
- PAPR reduction in OFDM
- Optical Systems and Laser Technology
- Network Traffic and Congestion Control
- Software-Defined Networks and 5G
- Analog and Mixed-Signal Circuit Design
Technical University of Munich
2015-2020
Microsoft Research (United Kingdom)
2020
Huawei Technologies (Germany)
2020
Klinikum rechts der Isar
2019
Nonlinearity compensation is considered as a key enabler to increase channel transmission rates in the installed optical communication systems. Recently, data-driven approaches - motivated by modern machine learning techniques have been proposed for communications place of traditional model-based counterparts. In particular, application neural networks (NN) allows improving performance complex fiber-optic systems without relying on any priori knowledge their specific parameters. this work,...
Present and next generation optical communication systems are constantly being developed to operate at higher baud rates modulation formats. It then becomes inevitable consider the various linear nonlinear effects due imperfect components transmitter. State-of-the-art digital-to-analog converters, high bandwidth driver amplifiers, dual-polarization (DP) Mach-Zehnder modulators far from ideal present distortions in form of limitation, transmitter I/Q skew, effects. In this letter, we propose...
We report on the results of a field trial carried out Telecom Italia metro link, targeting short data center interconnect applications. The test-bed presented realistic transmission conditions, such as an average ~0.3-dB/km attenuation and usage legacy erbium-doped fiber amplifier (EDFA) only. transmitted net bit rate 400 Gb/s single carrier with 64 quadrature amplitude modulation (QAM) 128QAM over 156 km. Error-free 80 km for dense wavelength-division multiplexing (DWDM) 30 × 400G 64QAM...
Digital pre-compensation (DPC) is an indispensable block of state-of-the-art optical transceivers, and a key enabler for high-order modulation formats (HOMFs) transmission. A crucial component, which enables the transmission precompensated HOMFs, digital-to-analog-converter (DAC). However, as data symbol rates grow, implementation such devices becomes highly challenging in terms performance, power consumption, costs. In this paper, digital-resolution-enhancer (DRE) algorithm discussed,...
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text G. Khanna, S. Calabrò, B. Spinnler, E. De Man, and N. Hanik, "Joint Adaptive Pre-Compensation of Transmitter I/Q Skew Frequency Response for High Order Modulation Formats Baud Rates," in Optical Fiber Communication Conference, OSA Technical Digest (online) (Optica Publishing Group, 2015), paper M2G.4. Export BibTex Endnote (RIS) HTML Plain Video alert Save article
The difficulty of building large data centers in dense metro areas is pushing big cloud providers towards a different approach to scaling: multiple smaller within tens kilometers each other, comprising "region". We show that networking this small number nearby sites with other surprisingly challenging and multi-faceted problem. draw out the operational goals constraints such networks, highlight design trade-offs involved using from Microsoft Azure's regions.
Increase in transmission symbol-rate as well order of quadrature amplitude modulation (QAM) is identified the most economical way to reduce cost per transmitted bit. In particular, next generation transponders aim at supporting data-rates up 1 Tb/s employing superchannels due electrical components' bandwidth limitations. Furthermore, introduction a flexible-grid architecture can maximize throughput by minimizing spectral gaps available optical spectrum. Keeping view these design options, we...
We report, to the best of our knowledge, highest symbol rate 220 GBaud in optical back-to-back QPSK transmission enabled by a new 256 GSa/s SiGe arbitrary waveform generator, >50 GHz 6 dB bandwidth GaAs IQ modulator and advanced nonlinear DSP.
An adaptive digital pre-distortion method based on memory polynomials to compensate for non-linearities in high power optical transmitters is presented. Gains up 2 dB ROSNR are achieved beyond linear pre-distortion.
We demonstrate a record 38.4Tb/s 64QAM C-band transmission over 762km of field deployed SSMF fiber, connecting Lyon and Marseille, France, employing hybrid EDFA-Raman amplification achieve spectral efficiency 8b/s/Hz. Furthermore, we demonstrate, for the first time to our knowledge, flexi-rate same commercial link, using quad-carrier 1Tb/s 16QAM (24.0 Tb/s), 32QAM (32.0 Tb/s) 1.2Tb/s (38.4 Tb/s).
We introduce a new transponder type for optical networks called an autonomous intelligent (AIT). It is capable of autonomously adapting transmission parameters to the quality link over which it transmitting. This concept fills one main gaps toward realization flexible, aware networks. present experimental results validate AIT as part field trial in Telia Carrier's live European backbone network.
An adaptive digital pre-distortion method to enable single carrier 400G DP-128QAM transmission over 328 km fiber with 30% FEC is presented. Experimental comparison in reach and spectral efficiency made DP-64QAM.
We demonstrate next-generation network upgrade scenarios using flexi-format (PM-QPSK➔PM-64QAM) and flexi-rate (100G300G) transmission over field-deployed fiber (762km). The back-to-back penalties are limited to ~2.6dB, whereas after transmission, available margin in excess of ~7.6dB is reported.
We propose and experimentally demonstrate an all-optical architecture for data center interconnect networks with reconfiguration times of a few seconds. Filtering amplification transient effects have minimal impact on BER performance.
Employing DACs with low resolution plays a significant role in reducing the transponder power consumption. We experimentally verified benefit of digital enhancer by transmitting WDM 400G-64QAM using 4 physical bits DAC over DCI distances.
In recent years, digital pre-distortion has emerged as a powerful approach to compensate linear and non-linear imperfections of the transmitter. Previous solutions are either based on factory calibration or use local auxiliary receiver. Here, we present architecture transmitter frequency response I/Q skew, which relies upon feedback from far-end receiver uses signal propagated over optical link. The effectiveness proposed solution is validated different transmission systems for...
Next generation bandwidth variable transponders require digital pre-compensation techniques (DPC) to generate high order symbol rate modulation formats. In this invited paper, we revise recently proposed DPC for optical transponders.
We present a phase noise canceler to improve the accuracy of transmitter I/Q skew estimation for high baud-rate optical transponders using high-order modulation formats. The proposed technique reduces probability failure due errors by an order magnitude.
We present a robust adaptive digital pre-distortion technique to mitigate the linear and non-linear degradation of optical communication transmitter components. The proposed method is based on principles memory polynomial indirect learning architecture. Effectiveness presented algorithm assessed across various higher order modulation formats baud rates. Significant gains are reported in back-to-back measurements lab field trial experiments.
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text G. Khanna, B. Spinnler, E. De Man, and N. Hanik, "Digital Pre-distortion Techniques for Ultra-high Symbol Rates," in OSA Advanced Photonics Congress (AP) 2019 (IPR, Networks, NOMA, SPPCom, PVLED), Technical Digest (Optica Publishing Group, 2019), paper SpT2E.1. Export BibTex Endnote (RIS) HTML Plain alert Save article