Optical Splitter Whitepaper
The document discusses optical splitters used in fiber networks and their manufacturing process. It introduces Telcordia standards GR-1209 and GR-1221 which specify tests to ensure splitter reliability
What quota should be applied to optical splitter testing
All output ports of an optical splitter should be individually tested to ensure compliance with insertion loss and splitter specifications.General Testing ApproachOptical splitters, whether 1:n, 2:n, or balanced/unbalanced, are passive devices that divide or combine optical signals. Testing involves measuring the insertion loss for each output port, which includes the expected split loss, excess loss from manufacturing, and connector losses . For a 1:n splitter, this means connecting the source to the input and measuring each of the n output ports individually. For a 2:n splitter, each input must be tested to all outputs in turn .Recommended Quota and StandardsPort-by-Port Testing: Every output port must be tested. For example, a 1x32 PON splitter requires 32 measurements downstream, and the same applies upstream if bidirectional testing is required .Reference Standards: Use industry standards such as OFSTP-14 for double-ended loss or FOTP-171 for single-ended testing . ANSI/TIA and ISO/IEC standards provide recommended splitter and connector loss limits .Equipment: Optical Loss Test Sets (OLTS) like the CertiFiber® Pro can automate port testing and grading, ensuring each port meets the defined limits . OTDR testing may require specialized instruments for networks with multiple splitters, and minimum fiber lengths after splitters must be observed to ensure accurate measurements .Additional ConsiderationsBalanced vs. Unbalanced Splitters: Balanced splitters distribute power evenly; unbalanced splitters may require customized test limits for each port .Wavelength Testing: Test at multiple wavelengths (commonly 1310 nm and 1550 nm) to verify performance across the operating range .Inspection: Always inspect fiber end faces before testing to prevent damage and ensure accurate results .Cascaded Splitters: When splitters are cascaded, calculate the group ratio (product of individual split ratios) to determine minimum fiber lengths and testing sequence .SummaryThe testing quota for optical splitters is effectively 100% of output ports, with each port measured individually for insertion loss and compliance with standards. Proper equipment, adherence to standards, and careful inspection are essential to ensure accurate and reliable results in both downstream and upstream directions.
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The FOA Reference For Fiber Optics
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The FOA Reference For Fiber Optics
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A PON testing strategy | Kingfisher International
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The FOA Reference For Fiber Optics
And the subscriber side of a splitter usually has several unused ports for future expansion that can be used for testing.The network equipment should be tested for optical power.