Always double check your fiber optics pigtails continuity prior to splicing.. In this case the fiber optics participants managed to find out the actual problem with regards to final insertion loss test.
The fiber optics handy troubleshooting tools , VFL (Visual Fault Locator) , is used to check fiber optics pigtail continuity..
I have been in the field of fiber optics since early 1990s. I gained fiber optics skills and knowledge via my working experience as end-user, main contractor and sub-contractor and finally as an optical fiber enterpreneur.