no code implementations • 8 Jul 2023 • Khouloud Abdelli, Carsten Tropschug, Helmut Griesser, Stephan Pachnicke
Passive optical network (PON) systems are vulnerable to a variety of failures, including fiber cuts and optical network unit (ONU) transmitter/receiver failures.
no code implementations • 3 Apr 2023 • Khouloud Abdelli, Carsten Tropschug, Helmut Griesser, Stephan Pachnicke
In this paper, to overcome the aforementioned issues, we propose a generic ML approach trained independently of the network architecture for identifying the faulty branch in PON systems given OTDR signals for the cases of branches with close lengths.
no code implementations • 1 Apr 2023 • Khouloud Abdelli, Carsten Tropschug, Helmut Griesser, Sander Jansen, Stephan Pachnicke
A machine learning approach for improving monitoring in passive optical networks with almost equidistant branches is proposed and experimentally validated.
no code implementations • 5 Nov 2022 • Khouloud Abdelli, Helmut Griesser, Christian Neumeyr, Robert Hohenleitner, Stephan Pachnicke
Semiconductor lasers have been rapidly evolving to meet the demands of next-generation optical networks.
no code implementations • 5 Nov 2022 • Khouloud Abdelli, Helmut Griesser, Stephan Pachnicke
First of all, an attention based gated recurrent unit (GRU) model is adopted for real-time prediction of performance degradation.
no code implementations • 19 Mar 2022 • Khouloud Abdelli, Helmut Griesser, Stephan Pachnicke
Fast and accurate fault detection and localization in fiber optic cables is extremely important to ensure the optical network survivability and reliability.
no code implementations • 19 Mar 2022 • Khouloud Abdelli, Helmut Griesser, Peter Ehrle, Carsten Tropschug, Stephan Pachnicke
To reduce operation-and-maintenance expenses (OPEX) and to ensure optical network survivability, optical network operators need to detect and diagnose faults in a timely manner and with high accuracy.
no code implementations • 19 Mar 2022 • Khouloud Abdelli, JOO YEON CHO, Florian Azendorf, Helmut Griesser, Carsten Tropschug, Stephan Pachnicke
The proposed method combines an autoencoder-based anomaly detection and an attention-based bidirectional gated recurrent unit algorithm, whereby the former is used for fault detection and the latter is adopted for fault diagnosis and localization once an anomaly is detected by the autoencoder.
no code implementations • 19 Mar 2022 • Khouloud Abdelli, Helmut Griesser, Carsten Tropschug, Stephan Pachnicke
Optical time-domain reflectometry (OTDR) has been widely used for characterizing fiber optical links and for detecting and locating fiber faults.
no code implementations • 19 Mar 2022 • Khouloud Abdelli, Danish Rafique, Helmut Griesser, Stephan Pachnicke
A novel approach based on an artificial neural network (ANN) for lifetime prediction of 1. 55 um InGaAsP MQW-DFB laser diodes is presented.
no code implementations • 19 Mar 2022 • Khouloud Abdelli, Florian Azendorf, Helmut Griesser, Carsten Tropschug, Stephan Pachnicke
We propose a deep learning approach based on an autoencoder for identifying and localizing fiber faults in passive optical networks.
no code implementations • 19 Mar 2022 • Khouloud Abdelli, Helmut Griesser, Stephan Pachnicke
In this paper, a data-driven diagnostic and prognostic approach based on machine learning is proposed to detect laser failure modes and to predict the remaining useful life (RUL) of a laser during its operation.
no code implementations • 19 Mar 2022 • Khouloud Abdelli, Helmut Griesser, Stephan Pachnicke
A hybrid prognostic model based on convolutional neural networks (CNN) and long short-term memory (LSTM) is proposed to predict the laser remaining useful life (RUL).
no code implementations • 19 Mar 2022 • Khouloud Abdelli, Helmut Griesser, Stephan Pachnicke
A new privacy-preserving federated learning framework allowing laser manufacturers to collaboratively build a robust ML-based laser lifetime prediction model, is proposed.
no code implementations • 16 Feb 2022 • Khouloud Abdelli, Helmut Griesser, Carsten Tropschug, Stephan Pachnicke
A novel multitask learning approach based on stacked bidirectional long short-term memory (BiLSTM) networks and convolutional neural networks (CNN) for detecting, locating, characterizing, and identifying fiber faults is proposed.
no code implementations • 13 Jul 2021 • Kaida Kaeval, Helmut Griesser, Klaus Grobe, Joerg-Peter Elbers, Marko Tikas, Gert Jervan
We test the concept of extended channel probing in an Optical Spectrum as a Service scenario in coherent optimized flex-grid long-haul and 10Gbit/s OOK optimized 100-GHz fixed-grid dispersion-managed legacy DWDM networks.
no code implementations • 14 Dec 2020 • Tobias Fehenberger, Helmut Griesser, Jörg-Peter Elbers
The reason for this behavior is that short-length PCS implicitly induces some temporal properties in the shaped transmit sequence that are beneficial for the fiber-optic channel.
no code implementations • 23 Sep 2020 • Annika Dochhan, Nicklas Eiselt, Robert Hohenleitner, Helmut Griesser, Michael Eiselt, Markus Ortsiefer, Christian Neumeyr, Juan José Vegas Olmos, Idelfonso Tafur Monroy, Jörg-Peter Elbers
We demonstrate up to 12 km, 56 Gb/s DMT transmission using high-speed VCSELs in the 1. 5 um wavelength range for future 400Gb/s intra-data center connects, enabled by vestigial sideband filtering of the transmit signal.
no code implementations • 22 Sep 2020 • Annika Dochhan, Helmut Griesser, Michael Eiselt, Jörg-Peter Elbers
We review currently discussed solutions for 80 km DWDM transmission targeting inter data-center connections at 100G and 400G line rates.
no code implementations • 22 Sep 2020 • Annika Dochhan, Nicklas Eiselt, Jinlong Wei, Helmut Griesser, Michael Eiselt, Juan José Vegas Olmos, Idelfonso Tafur Monroy, Jörg-Peter Elbers
We review three solutions for low-cost data center interconnects with a target reach of up to 80 km.
no code implementations • 22 Sep 2020 • Annika Dochhan, Helmut Griesser, Nicklas Eiselt, Michael Eiselt, Jörg-Peter Elbers
It can be seen that an FFT length of 128 is sufficient to reach the required performance in terms of bit error ratio, however, a higher length can significantly improve the performance.
no code implementations • 21 Sep 2020 • Annika Dochhan, Laia Nadal, Helmut Griesser, Michael Eiselt, Michela Svaluto Moreolo, Jörg-Peter Elbers
Enabled by channel adaptive bit and power loading, we experimentally demonstrate discrete multitone transmission at 56Gb/s with simple intensity modulation and direct detection and achieve 50 km reach in the 1. 55um window.
no code implementations • 12 Jun 2020 • Tobias Fehenberger, David S. Millar, Toshiaki Koike-Akino, Keisuke Kojima, Kieran Parsons, Helmut Griesser
This temporal property results in weaker nonlinear interactions, and thus higher SNR, for short CC sequences.
no code implementations • 12 Jun 2020 • Tobias Fehenberger, David S. Millar, Toshiaki Koike-Akino, Keisuke Kojima, Kieran Parsons, Helmut Griesser
In this paper, we study amplitude shaping schemes for the probabilistic amplitude shaping (PAS) framework as well as algorithms for constant-composition distribution matching (CCDM).
no code implementations • 8 Jun 2020 • Annika Dochhan, Nicklas Eiselt, Jim Zou, Helmut Griesser, Michael H. Eiselt, Jörg-Peter Elbers
We report on 112 Gbit/s real-time DMT transmission over up to 60 km, targeted at DCI applications.
no code implementations • 8 Jun 2020 • Annika Dochhan, Tomislav Drenski, Helmut Griesser, Michael H. Eiselt, Jörg-Peter Elbers
DMT at 25 Gbit/s, 50 Gbit/s and 100 Gbit/s in passive systems with electro-absorption modulators is investigated.
no code implementations • 11 May 2020 • Annika Dochhan, Helmut Griesser, Michael Eiselt
We experimentally demonstrate a novel 3-dimensional modulation format with 1. 2-dB OSNR tolerance improvement potential compared to DP-BPSK, as verified for the linear case.