1,720,966 research outputs found
Digital Optical Performance Monitoring of Coherent Long-Haul and Metropolitan Optical Fiber Links
No full textL'abstract è presente nell'allegato / the abstract is in the attachmen
Longitudinal Power Monitoring Performance with Subcarrier Multiplexing Transmission
No full textWe investigate the performance of Longitudinal Power Monitoring (LPM) algorithms at the small symbol rates achieved with subcarrier multiplexing. We show that at those symbol rates LPM is still effective, albeit with a noisier estimation profile
PDL Localization and Estimation Through Longitudinal Power Monitoring: A Comparison between Least Squares and Correlation Methods
No full textIn this work, we compare two Longitudinal Power Monitoring (LPM) techniques (Least-Squares and Correlation Method) for localizing and measuring Polarization-Dependent Loss (PDL) in a multi-span optical transmission link. We consider situations with different PDL values in the link and multiple PDL sources
PDL Localization and Estimation Through Linear Least Squares-Based Longitudinal Power Monitoring
No full textAn algorithm capable of localizing Polarization-Dependent Loss (PDL) and directly estimating its value in a multi-span optical transmission link using only Rx-side Digital Signal Processing (DSP) is presented. The algorithm employs a Linear Least Squares-based power profile estimation method and it succeeds in localizing multiple PDL sources along the link. Its performance is evaluated across diverse power levels, including SNR-maximizing ones, resulting in consistently comparable results
Estimation Accuracy of Polarization State from Coherent Receivers for Sensing Applications
No full textWe experimentally investigate on the intrinsic accuracy in fiber State of Polarization estimation from the DSP of commercial coherent tranceivers, in terms of angular uncertainty on the Poincaré’s sphere vs. received OSNRs, for sensing applications. We then demonstrate how using a moving average enhances accuracy
Comparison between Phase and Polarization Sensing using Coherent Transceivers over Deployed Metro Fibers
No full textWe experimentally compare SOP and phase extraction under identical system conditions over a deployed 32-km unamplified metro fiber link for vibrations sensing applications using coherent receivers
DSP-Based Nonlinear SNR Estimation via Longitudinal Power Monitoring in Commercial Coherent Receivers
No full textThe signal-to-noise ratio (SNR) measured on the received symbol constellation, accounting for both amplified spontaneous emission (ASE) noise and Kerr-induced nonlinear interference (NLI), is a key metric for system design and optimization. Consequently, separating these noise contributions enables the optimization of optical networks for more efficient and lower-margin transmissions. However, recent methods for nonlinear SNR estimation, such as artificial neural networks and statistical noise manipulation, require extensive knowledge of transmission parameters or large training datasets. In this work, an alternative approach, which requires minimal information about the system configuration, is described and validated through simulations and experiments. It exploits a linear least squares (LLS)-based longitudinal power monitoring (LPM) algorithm that can be implemented in standard coherent receivers, combined with analytical expressions based on closed-form NLI models (e.g., the GN model). In addition, the practical implementation challenges of using hard-decided symbols to generate reference signals for LLS-based LPM in NLI estimation are explored
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
SOP-based DSP Blind Anomaly Detection for Sensing on Deployed Metropolitan Fibers
No full textWe propose and compare two DSP anomaly detection schemes based on state of polariza-
tion monitoring over 35-km of installed metropolitan fibers. We experimentally evaluate their statistical
performance through receiver operating characteristics curves analysis
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