OTDR that can penetrate beam splitter
OTDRs designed for PON networks, such as the EXFO FTBx-730D and ORIENTEK K350-SM, can accurately test through optical splitters.
Key Features for Testing Through Splitters
Testing through a beam splitter in a PON network requires an OTDR with high dynamic range, high resolution, and specialized software to identify events after the splitter, which can introduce 15–17 dB of loss or more depending on the splitter ratio . OTDRs suitable for this task typically include:
- High dynamic range to detect weak signals after the splitter.
- Short dead zones to resolve events close to the splitter.
- PON-specific software for trace analysis and event identification.
- Dual-wavelength capability (commonly 1310/1550 nm) for comprehensive fiber characterization.
Recommended OTDR Models
- EXFO FTBx-730D
- Optimized for testing through optical splitters and characterizing FTTH links up to 132 km point-to-point.
- Dynamic range up to 42 dB, short PON dead zone, and high resolution for detecting closely spaced events.
- User-friendly interface and accessories for field testing.
- Proven performance for double-stage splitters and complex PON architectures .
- ORIENTEK K350-SM
- Supports testing through 1:16 or 1:32 splitters.
- Dual-wavelength simultaneous testing with intelligent trace analysis.
- Displays multiple event parameters, including loss, reflection, and fiber length.
- Suitable for field use with easy operation and multi-interface result display .
Practical Considerations
- Testing from the subscriber side is often preferred because it isolates a single path and avoids disrupting other users .
- Connector health is important; some OTDRs, like the FTBx-730D, feature swap-out connectors to maintain optimal performance in the field .
- Trace interpretation requires understanding backscatter and reflection events to accurately locate faults or measure insertion loss .
Summary
To test through a beam splitter effectively, choose a PON-capable OTDR with sufficient dynamic range, short dead zones, and software designed for splitter analysis. The EXFO FTBx-730D and ORIENTEK K350-SM are examples of OTDRs that meet these requirements, enabling technicians to troubleshoot and characterize fiber networks with splitters efficiently.
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