Search Results for author: Helmut Griesser

Found 27 papers, 0 papers with code

Fault Monitoring in Passive Optical Networks using Machine Learning Techniques

no code implementations8 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.

Faulty Branch Identification in Passive Optical Networks using Machine Learning

no code implementations3 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.

Branch Identification in Passive Optical Networks using Machine Learning

no code implementations1 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.

Convolutional Neural Networks for Reflective Event Detection and Characterization in Fiber Optical Links Given Noisy OTDR Signals

no code implementations19 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.

Event Detection Fault Detection

Reflective Fiber Faults Detection and Characterization Using Long-Short-Term Memory

no code implementations19 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.

Multi-Task Learning

Machine Learning-based Anomaly Detection in Optical Fiber Monitoring

no code implementations19 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.

Anomaly Detection BIG-bench Machine Learning +1

Lifetime Prediction of 1550 nm DFB Laser using Machine learning Techniques

no code implementations19 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.

BIG-bench Machine Learning

Gated Recurrent Unit based Autoencoder for Optical Link Fault Diagnosis in Passive Optical Networks

no code implementations19 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.

Machine Learning based Data Driven Diagnostic and Prognostic Approach for Laser Reliability Enhancement

no code implementations19 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.

BIG-bench Machine Learning

A Hybrid CNN-LSTM Approach for Laser Remaining Useful Life Prediction

no code implementations19 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).

Federated Learning Approach for Lifetime Prediction of Semiconductor Lasers

no code implementations19 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.

Federated Learning Privacy Preserving

A BiLSTM-CNN based Multitask Learning Approach for Fiber Fault Diagnosis

no code implementations16 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.

Channel Performance Estimations with Extended Channel Probing

no code implementations13 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.

Fiber Nonlinearity Mitigation by Short-Length Probabilistic Constellation Shaping for Pilot-Aided Signaling

no code implementations14 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.

56 Gb/s DMT Transmission with VCSELs in 1.5 um Wavelength Range over up to 12 km for DWDM Intra-Data Center Connects

no code implementations23 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.

Solutions for 80 km DWDM Systems

no code implementations22 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.

Optimizing Discrete Multi-tone Transmission for 400G Data Center Interconnects

no code implementations22 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.

Experimental Investigation of Discrete Multitone Transmission in the Presence of Optical Noise and Chromatic Dispersion

no code implementations21 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.

Huffman-coded Sphere Shaping and Distribution Matching Algorithms via Lookup Tables

no code implementations12 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).

Real-time 112 Gbit/s DMT for Data Center Interconnects

no code implementations8 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.

Real-time discrete multi-tone transmission for passive optical networks in C- and O-band

no code implementations8 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.

First Experimental Demonstration of a 3-Dimensional Simplex Modulation Format Showing Improved OSNR Performance Compared to DP-BPSK

no code implementations11 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.

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