I don’t have tutorials, but I have material to read and sample files. This is what is in the attachments:
FibreBendX.bpd == conformal map examples in OptiBPM for bend loss on fibres
FibreBendLoss.doc == description and comparison of results
FibreBendLoss.fcd == results from OptiFiber
Conformal Map Theory.pptx == The theory behind the conformal map method in BPM
I can also recommend two papers on the subject:
Ross T. Schermer, and James H. Cole, “Improved Bend Loss Formula Verified for Optical Fiber by Simulation and Experiment”, IEEE JOURNAL OF QUANTUM ELECTRONICS, VOL. 43, NO. 10, p899-909 OCTOBER 2007
Dietrich Marcuse, “Field deformation and loss caused by curvature of optical fibres”, J. Opt. Soc. Am., Vol. 66, No. 4, p311-320 April 1976