129 research outputs found
Development and real-time implementation of digital signal processing algorithms for coherent optical receivers
No full textTimo PfauPaderborn, Univ., Diss., 200
Pilot-Symbols-Aided Carrier-Phase Recovery for 100-G PM-QPSK Digital Coherent Receivers
No full textA feedforward pilot-symbols-aided carrier-phase recovery scheme is described. The approach relies on pilot symbols that are time-division multiplexed with the transmitted data. In the scheme, an initial coarse estimation of the optical carrier phase, exploiting the knowledge of pilot symbols, is followed by a fine nondata-aided, or blind, estimation. The main
advantage of the proposed solution is that of avoiding the phaseambiguity
problem after a cycle slip. The overhead and the impact on the performance of pilot symbols are investigated for long-haul transmission of 100-Gb/s polarization-multiplexed quadrature phase-shift keying wavelength-division-multiplexing signals in different scenarios. For homogeneous transmission,
the proposed scheme outperforms blind carrier recovery with differential decoding
Synchrone 1,6-Gbits-QPSK-Datenübertragung in Echtzeit mit DFB-Lasern
No full textHoffmann S, Pfau T, Peveling R, et al. Synchrone 1,6-Gbits-QPSK-Datenübertragung in Echtzeit mit DFB-Lasern. In: Workshop der ITG Fachgruppe 5.3.1, Modellierung photonischer Komponenten und Systeme. 2006: 21-27
Realization of Digital Coherent Receivers
No full textNoe R, Rückert U, Hoffmann S, Pfau T, Peveling R. Realization of Digital Coherent Receivers. In: IEEE Photonics Society, ed. LEOS, Annual Meeting 2009. Belek-Antalya, Turkey: IEEE; 2009.The hardware architecture of digital coherent optical receivers supporting >40 Gb/s data rates and general considerations about signal processing algorithms are presented as well as a chipset layout for a 40 Gb/s digital coherent polarization-multiplexed QPSK receiver
Hardware-Efficient and Phase Noise Tolerant Digital Synchronous QPSK Receiver Concept
No full textHoffmann S, Pfau T, Adamczyk O, Peveling R, Porrmann M, Noe R. Hardware-Efficient and Phase Noise Tolerant Digital Synchronous QPSK Receiver Concept. In: Proceedings Optical Amplifiers and Their Applications/Coherent Optical Technologies and Applications. Optical Society of America; 2006.Simulation results and a first standard cell CMOS implementation are reported for efficient carrier and data recovery methods in the IF domain of digital I&Q receivers, for synchronous QPSK transmission with standard DFB lasers
Frequency Estimation and Compensation for Coherent QPSK Transmission with DFB Lasers
No full textHoffmann S, Pfau T, Adamczyk O, et al. Frequency Estimation and Compensation for Coherent QPSK Transmission with DFB Lasers. In: Proc. OSA Topical Meeting Coherent Optical Technologies and Applications (COTA). OSA; 2008.We present a hardware-efficient combined frequency and phase estimator. It is capable of tracking phase noise of 10 GBaud optical QPSK transmission systems with DFB lasers and frequency mismatch up to 0.8 GHz
Implementation of Coherent 16-QAM Digital Receiver with Feedforward Carrier Recovery
No full textal Bermani A, Noe R, Hoffmann S, Wördehoff C, Rückert U, Pfau T. Implementation of Coherent 16-QAM Digital Receiver with Feedforward Carrier Recovery. In: Signal Processing in Photonic Communications. IEEE Xplore; 2010.1.25 Gbit/s synchronous coherent 16-QAM data is transmitted and received in a real-time intradyne setup with BER below FEC threshold. A phase noise tolerant feedforward carrier recovery concept with hardware-efficient implementation was tested
1.6 Gbit/s Real-Time Synchronous QPSK Transmission with Standard DFB Lasers
No full textPfau T, Hoffmann S, Peveling R, et al. 1.6 Gbit/s Real-Time Synchronous QPSK Transmission with Standard DFB Lasers. In: Proceedings of the 32nd European Conference on Optical Communication (ECOC 2006). IEEE; 2006.Using standard DFB lasers, 1.6 Gbit/s QPSK data is demodulated and recovered coherently and
synchronously in real-time, faster than ever before. BER after 63 km of fiber is well below the FEC threshold
First Realtime Synchronous 16-QAM Transmission with Coherent Digital Receiver
No full textal Bermani A, Wördehoff C, Pfau T, Hoffmann S, Rückert U, Noe R. First Realtime Synchronous 16-QAM Transmission with Coherent Digital Receiver. In: 11. ITG-Fachtagung "Photonische Netze". Vol 222. ITG/VDE; 2010: 153-156.This letter presents for the first time 1.25 Gb/s synchronous coherent 16-point Quadrature Amplitude Modulation (16-QAM) transmitted and received data in a real-time homodyne setup with external cavity laser (ECL). For powers larger than ?20dBm, the average bit error rate (BER) is below forward-error correction (FEC) limit
Performance of Modified Decision-Directed Polarization Control/Demultiplex Algorithm in Coherent QAM Receiver
No full textEl-Darawy M, Pfau T, Wördehoff C, Noe R. Performance of Modified Decision-Directed Polarization Control/Demultiplex Algorithm in Coherent QAM Receiver. In: Institute of Electrical and Electronics Engineers, Optical Society of America, eds. Proc. OFC/NFOEC 2010. Piscataway, NJ: IEEE Xplore; 2010.A modified decision-directed polarization control and demultiplex algorithm for
coherent receivers is evaluated for QAM schemes up to order 256, and compared against the constant-modulus algorithm adapted for QAM and differential phase compensation
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