GB/T 46385.24-2025 Optical circuit boards—Part 2-4:Basic test and measurement procedures—Optical transmission test for optical circuit boards without input/output fibres

Scope

This document describes a test method for determining whether an optical circuit board is qualified based on light illumination. Directly illuminating the injection port and using a surface imaging sensor to detect the light intensity at the output port of the optical circuit board. The additional optical loss is calculated by comparing the total detected light intensity of the tested sample with that of the reference sample. Uniform illumination is performed with light that covers an area larger than the injection port optical waveguide core region of the optical circuit board (OCB). The radiance of the corresponding output port of the optical circuit board is obtained using a surface imaging sensor, and compared with the radiance of the reference sample to evaluate whether the optical circuit board is qualified. The advantage of this test method is that it eliminates the need for alignment procedures between the injection fiber and the OCB. A test method example is provided in Appendix A.

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