Diagnose and resolve optical power issues in modern fiber networks with this complete engineering guide. Learn how to detect loss, instability, alarms, and link degradation using power measurements, OTDR testing, and high-stability optical modules such as LINK-PP solutions. Because optical networks. This course provides students with the knowledge and hands-on skills required to troubleshoot and resolve Nokia photonic nodes' issues using direct web and command line interfaces. Participants will learn optical signal flow through a node using the Nokia 1830 Engineering and Planning Tool (EPT). Abstract—A transformer-based deep learning approach is presented that enables the diagnosis of fault cases in optical fiber amplifiers using condition-based monitoring time series data. The model, Inverse Triple-Aspect Self-Attention Transformer (ITST), uses an encoder-decoder architecture. This model repre-sents the noninverting op amp connection by an amplifier with input error signal e and with feedback transmission factor b. This feedback factor determines the signal be fed back to the amplifier input from the output signal eo. Writing 1/b In this result, a gain of amplifies both. This paper analyzes the common faults of power communications OTN and puts forward a series of effective preventive measures. It is based on wavelength division multi-plexing. Keywords: Fiber amplifier maintenance, troubleshooting fiber optics, pump laser degradation Fiber amplifiers are robust devices, but their performance can degrade over time due to environmental factors, contamination, or component aging. Proactive maintenance and systematic troubleshooting ensure.