Detection of China Unicom optical splitter ports

Optical splitter ports can be identified using wavelength-specific detection, power coding analysis, or practical field testing with OTDRs and PON power meters.

Patent-

Based Technical Methods

Sequential Wavelength Detection and Raman Pumping One method involves sending multiple detection optical signals of different wavelengths to a target ONU, combined with a downlink service signal.

The ON

U generates a Raman effect when receiving the detection signal, and the optical power of the characteristic signals is measured. By analyzing the power variation, the optical filtering characteristics of each splitter port are determined, allowing identification of the port connected to the target ONU (CN118338161A). Power Coding Combination Analysis Another approach uses the concept of power and transmittance coding combinations.

Each splitter port is configured with a unique transmittance code for different wavelengths. By acquiring the optical signal from the distribution network and determining the power code combination at the ONU, the specific output port of the splitter connected to the ONU can be identified (WO2025119033A1). This method is particularly useful in multi-level splitters and complex PON scenarios.

Practical Field Testing Methods

Optical Loss Test Set (OLTS) Devices like the CertiFiber Pro can measure the loss of each splitter port. Using the “Loopback” mode, the input signal is sent through the splitter, and the output power is measured at each port. This allows verification of port loss against ANSI/TIA and ISO/IEC standards, ensuring the splitter is within defined limits.

OTD

R Testing For deep fiber applications, a PON-specific OTDR with high dynamic range and resolution can trace the optical path from the subscriber side. By testing each path individually, the OTDR can identify the specific splitter port and detect faults without disrupting other users. This method is commonly used for 1x32 or larger splitters.

PON Power Meter Testing A PO

N power meter measures downstream and upstream signals. By connecting the meter to the ONU and observing the signal levels, technicians can determine if the ONU is receiving the correct downstream power and identify the corresponding splitter port. Low or absent downstream power indicates a potential fiber or port issue.

Summary

Patent methods focus on wavelength-specific detection and coding analysis to identify splitter ports accurately, suitable for complex or multi-level PONs. Field testing methods using OLTS, OTDR, and PON power meters provide practical, real-world verification of splitter ports and signal integrity. Combining both approaches can improve accuracy and efficiency in identifying and troubleshooting China Unicom optical splitter ports.

These methods ensure precise port identification, facilitate fault location, and maintain the performance of passive optical networks.