Optical module receiving power

A receive power of -15 dBm is generally considered low and may indicate excessive signal loss or a potential issue in the fiber link.Understanding RX PowerReceive power (RX) is the optical signal level detected by the receiving end of an optical module, measured in dBm . It must fall within the module's specified receiver sensitivity and overload power range to ensure proper signal interpretation . If the RX power is below the receiver sensitivity, the module may fail to detect signals correctly, leading to bit errors or link instability .Typical RX Power RangesFor most short- to medium-range transceivers, normal RX power is between -1 and -9.9 dBm .Values around -14 dBm or lower often indicate signal degradation due to fiber issues, such as dirty connectors, bad splices, or poorly seated jumpers .Extremely low readings (e.g., -30 dBm) usually represent the noise floor, meaning no usable signal is being received .Possible Causes of -15 dBm RX PowerFiber Attenuation: Long fiber runs or high-loss cables can reduce signal strength.Connector or Splice Issues: Dirt, dust, or misalignment at connectors can cause significant loss.Transceiver Mismatch: Using a short-range transceiver on a long-distance link may result in insufficient RX power.Excessive Link Loss: Bends, breaks, or poor-quality fiber can attenuate the signal beyond the receiver's sensitivity .Recommended ActionsInspect and clean connectors at both ends of the fiber.Check fiber continuity using an OTDR or power meter to identify high-loss segments.Verify transceiver specifications to ensure the module supports the link distance and fiber type.Replace or reseat jumpers if necessary to improve signal quality. In summary, an RX power of -15 dBm is below the typical expected range for most optical modules and suggests that the link may require troubleshooting to restore optimal performance .