IL @ 1310 higher than 1550
A connector, or an entire product design, showing a significantly higher Insertion Loss at 1310 than at 1550 indicates a likely problem in core-to-core alignment between the two mated ferrules. The difference may be small, and indeed may be acceptable. The larger the misalignment, the more Insertion Loss @ 1310 compared to 1550. The cause of the misalignment could be due to many factors, most often either contamination on the product and testing components, or poor fiber core-to-ferrule concentricity.
Contamination can hopefully be removed, and the preceding manufacturing process refined to eliminate prior to testing. Poor concentricity, however, is often the result of using oversized ferrules, and thus the Insertion Loss cannot be improved without replacing the connector. “Oversized” is relative: the larger the ferrule hole bore is than the fiber OD, the most the fiber will be able to sit off to the side of ferrule center, and thus the larger the expected Insertion Loss @ 1310.
READ THE BLOG: Insertion Loss Troubleshooting Tip: Singlemode 1310 vs. 1550
Additional resources from the FOC team include:
- Category Resource: FOC Test Page
- Glossary, Acronyms, Military Specifications for Connectors: http://bit.ly/2a2EFn8
- Q&A Resource: email technical questions to AskFOC@focenter.com
Have questions about this FOC Tip?
Contact FOC with questions at: (800) 473-4237 / 508-992-6464 or email: FiberOpticCenter@focenter.com and we will respond ASAP.
- Considerations regarding freezing epoxy – THAWING - November 13, 2019
- Crystallization in Epoxies: How to Identify and Reverse it - October 23, 2019
- Measuring Insertion Loss and Return Loss Recommendations to Achieve the Best and Most Accurate Test Measurement - October 23, 2019
- Cross-Sectioning Fiber Optic Connectors: An Effective Diagnostic Method to Identify Defects and Resolve Process Issues - October 23, 2019
- The “Ideal” Fiber Height for a Fiber Optic Connector – and How to Achieve It - October 23, 2019
- Considerations regarding freezing epoxy – recommended length of time - October 23, 2019
- Techniques when using stripping tools - October 18, 2019
- Considerations regarding freezing epoxy – implementing process controls - September 18, 2019
- Aramid yarns and Good stripping techniques - September 11, 2019
- When the “back-side” connector end-face is contaminated, it is difficult to have access to remove the connector for cleaning - September 8, 2019