How to Measure the Transmit Optical Power of an Huawei OLT PON Port?

Check whether the optical module on a PON port of the OLT works properly by measuring the transmit optical power.

Prerequisites

• The OLT is powered on.
• The PON board is in the normal state.
• The PON port is enabled.

Tools, Meters and Materials

• Single-mode fiber jumper with the SC/PC connector. No longer than 1 m. Best to use new jumper.
• Burst optical power meter or ordinary optical power meter.

Impact on the System
When the transmit optical power of a PON port on Huawei OLT is measured, the PON port will fail to transmit any service.

Precautions
Before or after measuring the optical power, you need to clean the connector of the optical fiber. This is because if a contaminated optical fiber is connected to a normal optical fiber connector, the connector will be contaminated, which leads to abnormal attenuation and reflection and thus affecting optical path quality.

Procedure
Step 1 Configuring the measure parameters of the optical power meter.
Unit of optical power: dBm
Wavelength: 1490 nm
Step 2 Connect the optical power meter directly to the optical module on the OLT PON port using optical fiber jumper, as shown in Figure The value on the optical power meter is the transmit optical power of Huawei OLT MA5800 PON port.

• If the value on the optical power meter changes within a range of 0.2 dBm, take the average value.
• If the value on the optical power meter changes in a range wider than 0.2 dBm, then it is possible that the fiber is not properly connected, the fiber is excessively bent, or the fiber connector has dust.
• Do not bend the fiber. A bent fiber may affect the test result.

Step 3 Compare the test result with the optical module parameters of the corresponding board in the hardware description.