Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 40, Issue 8, Pages 2390-2408Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2021.3139167
Keywords
Optical fiber amplifiers; Optical fibers; Optical amplifiers; Optical fiber communication; Stimulated emission; Customer relationship management; Optical reflection; Channel reconstruction; chromatic dispersion; digital longitudinal monitoring; gain spectrum; optical fiber loss; passband narrowing; split-step Fourier method
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This paper presents a method for reconstructing optical transmission channels by extracting physical characteristics of various link components from receiver-side digital signal processing. The method allows for the localization of anomaly components without direct measurements.
Optical transmission links are generally composed of optical fibers, optical amplifiers, and optical filters. In this paper, we present a channel reconstruction method (CRM) that extracts physical characteristics of multiple link components such as longitudinal fiber losses, chromatic dispersion (CD), multiple amplifiers' gain spectra, and multiple filters' responses, only from receiver-side (Rx) digital signal processing (DSP) of data-carrying signals. The concept is to reconstruct a virtual copy of an actual transmission channel in the digital domain, where optical fibers and amplifiers are modeled as the split-step Fourier method for the Manakov equation while optical filters are emulated as complex-valued finite impulse response filters. We estimate the model parameters such as losses, CD, gains, and filter responses from boundary conditions, i.e., transmitted and received signals. Experimental results show that, unlike traditional analog testing devices such as optical time-domain reflectometers and optical spectrum analyzers, CRM visualizes multi-span characteristics of fibers, amplifiers, and filters in Rx DSP, and thus localizes anomaly components among multiple ones without direct measurement.
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