Lasers and thermoelectric coolers (TECs) inside optical modules can be easily broken or disconnected after collisions. Use a dedicated cotton swab to gently rub the stain on an optical bore. Optical modules must be handled with standardized procedures during application, as any non-compliant action may cause potential damage or permanent failure. The primary causes of optical module failure are performance degradation due to ESD damage, and optical path discontinuity caused by optical. An optical module is a critical component in modern optical communication systems, directly affecting transmission stability, network reliability, and operational efficiency. After analyzing the specific reasons, the most common problems are concentrated in the following aspects: 1.