Fusion Splice Loss from Fiber and Geometry Mismatch

The worked 9.2/8.6 micron fiber mismatch costs only 0.020 dB, while a 2 degree cleave approaches 0.99 dB. A core-alignment splicer can correct offset but not the cleave; fiber, splicer, and acceptance-test requirements govern.

MFD mismatch = -20 log10(2 w1 w2/(w1^2+w2^2)); lateral loss = 4.343(d/w)^2; angular loss = 4.343(pi n w theta/lambda)^2; small losses add approximately.

Gaussian single-mode splice-loss approximations for mode-field mismatch and geometric misalignment.

Three Gaussian coupling approximations.

Estimate. AHJ and licensed professional govern.

Field names used by the API: mfd_1_um, mfd_2_um, lateral_offset_um, cleave_angle_deg, wavelength_nm, fiber_index, mfd_mismatch_loss_db, lateral_offset_loss_db, angular_loss_db, angular_2deg_loss_db, total_loss_db

• Single-mode Gaussian approximation not applicable to multimode fiberthe coupling model
• Independent small losses real fusion also depends on contamination, arc parameters and core geometrythe splicer data
• One-direction intrinsic estimate dissimilar fibers require bidirectional OTDR averagingthe acceptance test standard