A5057513488- Optical Network Technologies
- Photonic and Optical Devices
- Advanced Photonic Communication Systems
- Semiconductor Lasers and Optical Devices
- graph theory and CDMA systems
- Error Correcting Code Techniques
- PAPR reduction in OFDM
- Advanced Wireless Communication Techniques
- Advanced Optical Network Technologies
- Blind Source Separation Techniques
- Advanced Fiber Laser Technologies
- Quantum optics and atomic interactions
- Advancements in PLL and VCO Technologies
- Quantum Information and Cryptography
Institute of Electrical and Electronics Engineers
2024
Infineon Technologies (Germany)
2023
VPIphotonics (Germany)
2018-2020
Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute
2012-2016
Technische Universität Berlin
2012-2016
Fraunhofer Society
2013
In this invited contribution, we discuss technology options for bandwidth-variable transceivers which are key components the realization of flexible software-defined optical networking. Bandwidth-variable enable software-controlled adaptation physical layer parameters such as transmitted bit rate, spectral efficiency and transparent reach according to traffic demands at hand. particular, focus on recent advances in four-dimensional modulation formats format data-aided digital signal...
We experimentally demonstrate the use of data-aided digital signal processing for format-flexible coherent reception different 28-GBd PDM and 4D modulated signals in WDM transmission experiments over up to 7680 km SSMF by using same resource-efficient algorithms equalization all formats. Stable regular performance nonlinear regime is confirmed.
A novel, two-stage algorithm for polarization demultiplexing and equalization of probabilistically shaped QAM is presented. It operates blindly, requiring no knowledge the channel or transmitted sequence. Performance validated under realistic PMD conditions.
Four-dimensional (4-D) set-partitioning quadrature amplitude modulation (4-D SP-QAM) has emerged as an interesting option for cost- and resource-efficient realization of bandwidth variable transceivers in elastic optical networks. In this invited paper, we review the principles generation 4-D SP-QAM signals, describe options forward error correction coding signals digital signal processing coherent receiver. Furthermore, report on experimental 512-ary 2048-ary at a symbol rate 28 GBd...
We demonstrate for the first time 32 GBd 64-QAM signal generation without usage of DACs. The dual-polarization is transmitted error-free over 80 km SSMF with 7.8 pJ/bit record low energy consumption.
A four-dimensional modulation format with 256 point from the D4-lattice (256-D4) is compared to PM-16QAM in experiments. 256-D4 more sensitive at high OSNR but a 21.3% overhead turbo product code, outperforms 256-D4.
A real-time implementation of a coherent optical pluggable module using digital sub-carrier (DSC) multiplexing has recently been demonstrated. Whilst these modules can support traditional point-to-point (P2P) applications, similar to e.g., 400ZR(+) – with at least the same performance, it is point-to-multi-point (P2MP) functionality that differentiates their capabilities from single-carrier implementation. The superior performance transmission and its insensitivity link effects, in...
We experimentally generate 28-GBd 6-ary polarization-shift keying quadrature phase-shift (6PolSK-QPSK) signals by utilizing a high-speed 4-channel digital-to-analog converter and an integrated dual-polarization I/Q modulator. In WDM transmission experiments over up to 4800 km standard single-mode fiber, we compare the performance of 126-Gb/s 6PolSK-QPSK 112-Gb/s polarization-division multiplexing (PDM) QPSK signals. Furthermore, discuss implications applying inner Reed-Solomon RS(511,455)...
We experimentally investigate four-dimensional (4-D) Trellis coded modulation (TCM) based on polarization-division multiplexed (PDM) 16-ary quadrature amplitude (QAM), PDM-32QAM, and PDM-64QAM formats. A multirate optical transponder is enabled by only a single-encoder/decoder structure. The scheme resilient to cycle-slip events due its 90° phase rotation invariant property. In addition, the performance of 4-D turbo TCM (TTCM) investigated. superior TTCM over validated. Furthermore, TCM/TTCM...
We discuss technology options for bandwidth-variable transceivers which are key components the realization of flexible software-defined optical networking. In particular, we focus on recent advances in four-dimensional modulation formats and format transparent data-aided digital signal processing.
We experimentally generate 28-GBd 6PolSK-QPSK signals by utilizing a high-speed 4-channel DAC and an integrated dual-polarization I/Q modulator. In WDM transmission experiments over up to 4800 km standard single-mode fiber, we compare the performance of 126-Gb/s 112-Gb/s PDM-QPSK signals.
The performance of the 4-D 128SP-QAM format is experimentally investigated in a Nyquist-wavelength division multiplexing system for two different forward error correction (FEC) scenarios. Two soft-decisions FEC schemes are evaluated 128SP-QAM, namely, turbo product code (TPC) and low-density parity-check (LDPC) code. results show that after full convergence LDPC outperforms TPC with respect to coding gain at bit ratio 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
We demonstrate the spatially distributed aggregation of four 31.1-GBd PDM-32QAM sub-carriers into a 1-Tb/s net data rate superchannel occupying only 125-GHz optical bandwidth, and its subsequent transmission over 160-km SSMF with broadband reception in single coherent receiver.
We experimentally investigate the characteristics of 126-Gb/s coded 6PolSK-QPSK signals in nonlinear transmission regime and demonstrate that required OSNR improvement is increasing with fiber-launch power due to modulation as well digital back propagation.
We introduce an algorithm for digital equalization of 6PolSK-QPSK signals and present a way to initialize the filter coefficients 2×2 adaptive time-domain equalizer in optimum manner. The proposed has been found perform well both numerical simulations transmission experiments.
A hybrid transmitter module comprising a 15-segment InP IQ segmented Mach–Zehnder modulator and two 0.13 <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">μ</i> m BiCMOS SiGe:C drivers with integrated 4-bit DAC functionality is described. The high-resolution prototype allows wide range of modulation formats and, for the first time, ultralow-power dual-polarization (DP) 64-QAM signal generation at record speed 32 GBd without usage external DACs...
We report on the experimental realization of 28-GBd four-dimensional 512-ary set-partitioning QAM signals and investigate them in a Nyquist-WDM scenario. In transmission experiments over standard single-mode fiber, we compare with PDM-16QAM PDM-32QAM signals.
A hybrid optical transmitter module comprising a 15-segment InP in-phase/quadrature-phase segmented Mach-Zehnder modulator and two SiGe:C BiCMOS drivers featuring integrated 4-b digital-to-analog converter functionality is described. The drivers, fabricated in the 0.13-μm process of IHP, deliver differential output voltage 2.5 V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">pp</sub> across all 15 segments while dissipating less than 1 W power...
We investigate a carrier phase estimation algorithm for the polarization-switched quadrature phase-shift-keying modulation format. The algorithm, which is based on conventional block M <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> power feed-forward scheme, works jointly both polarizations and shows significant performance improvement compared with polarization-independent scheme. evaluate tolerance to laser noise in numerical...
We experimentally demonstrate the use of data-aided digital signal processing for format-flexible coherent reception different 28-GBd PDM and 4D modulated signals in WDM transmission experiments over up to 7680 km SSMF by using same resource-efficient algorithms equalization all formats.
Due to their compatibility existing telecom technology, continuous variable (CV) weak coherent state protocols are promising candidates for a broad deployment of quantum key distribution (QKD) technology. We demonstrate how an simulation framework modelling classical optical systems can be utilized simulations weak-coherent CV-QKD links. The uncertainties the measured characteristics signals modelled in electrical domain by shot noise, while signal is described its quadrature components....
Capacity demand for network connections within and between datacenters is increasing relentlessly, fueling the need deployment of new improved optical communications equipment. Confronted with task developing innovative solutions to address this challenge, engineers must deal consolidate countless design choices that are influenced by a large variety constraints. To name just few, an optimum solution may depend on technological requirements such as minimum data rate, maximum latency,...