1. Optical Power Mismatch: If the transmit (Tx) power at one end is too high or too low relative to the receiver (Rx) sensitivity at the other end, the effective transmission distance can differ. Low Tx power or high Rx sensitivity can reduce link performance, while excessive Tx power may overload the receiver, causing errors or reduced range . 2. Module and Fiber Type Mismatch: Single-mode modules must use single-mode fiber, and multimode modules must use multimode fiber. Using incompatible fiber types can prevent the link from reaching its intended distance . Additionally, non-certified or incompatible optical modules may not perform to specification, causing distance inconsistencies . 3. Port Configuration Differences: Differences in speed, duplex, or negotiation mode between the two ends can affect link performance. Ensure both ports are configured identically, including auto-negotiation settings and link type . 4. Connector or Fiber Issues: Dirty, scratched, or damaged connectors and fiber can scatter or block light, reducing effective distance. Even minor contamination on ferrules can cause significant signal loss . Patch panel mispatches or disconnected jumpers can also create inconsistent link distances . 5. Wavelength or Module Type Mismatch: For BiDi or wavelength-specific transceivers, the Tx wavelength at one end must match the Rx wavelength at the other. Mismatched wavelengths can prevent proper signal reception and reduce effective distance .
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