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How to test the wavelength of a pigtail fiber

How to test the wavelength of a pigtail fiber

How to test the wavelength of a pigtail fiber  - MADIBA BAY OPTICS

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Fiber optic pigtails are typically tested at 1310 nm and 1550 nm for single-mode fibers, and at 850 nm and 1300 nm for multimode fibers.

Standard Testing Wavelengths

  • Single-mode fibers (SMF): Pigtails and other single-mode fibers are commonly tested at 1310 nm and 1550 nm. These wavelengths are chosen because they correspond to the low-loss transmission windows of silica-based single-mode fibers, allowing accurate measurement of insertion loss, back reflection, and splice quality .
  • Multimode fibers (MMF): For multimode pigtails, testing is usually performed at 850 nm and 1300 nm, which are the standard operating wavelengths for multimode fibers and provide reliable attenuation and connector loss measurements .

Testing Considerations for Pigtails

  • Launch Reels: When testing pigtails, a short launch reel (typically 1 km) is used to ensure accurate measurement of connector loss and back reflection near the splice point .
  • OTDR Settings: The OTDR or power meter should be configured with the correct index of refraction for the fiber type and the appropriate backscatter coefficient to ensure precise readings .
  • Span Length: For short spans (less than 64 km), both 1310 nm and 1550 nm are used for single-mode fibers. For longer spans, only 1550 nm is typically used due to lower attenuation .

Summary

To test fiber optic pigtails effectively:

  • Use 1310 nm and 1550 nm for single-mode pigtails.
  • Use 850 nm and 1300 nm for multimode pigtails.
  • Ensure proper launch conditions, OTDR settings, and calibration of power meters to obtain accurate insertion loss and reflectance measurements. These wavelengths are standardized in fiber optic testing to match the transmission characteristics of the fiber and to provide consistent, reliable results across installations .

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