ELOS 2022

Ephraim Suhir

Ephraim Suhir, Speaker at Optics Conference
Portland State University, United States
Title : Fiber Optics Structural Analysis (FOSA): Application of Analytical ("Mathematical") Predictive Modeling


The fundamentals of a body of knowledge that could be identified as fiber optics structural analysis (FOSA) are addressed. The emphasis is on the application of analytical ("mathematical") predictive modeling, as well as on the probabilistic design for reliability (PDfR) of fiber optics structures.  In the FOSA part of the presentation optical fibers subjected to thermal and/or mechanical loading (stresses) in bending, tension, compression, or to the combinations of such loadings are considered. The addressed structures include, but are not limited to, optical fibers of finite length: bare fibers; jacketed and dual-coated fibers; fibers experiencing thermal loading; fibers soldered into ferrules or adhesively bonded into capillaries. The roles of geometric and material non-linearity; dynamic response to shocks and vibrations; and possible applications of nano-materials in new generations of coating and cladding systems are addressed. The PDfR  part of the presentation is concerned with a novel, fruitful and challenging direction- probabilistic modeling of the states of stress and strains and the useful lifetime of electronic, opto-electronic and photonic products and particularly optical fibers and interconnects. The rationale behind the PDfR concept is that the probability of failure is never zero, but could be predicted and made adequate for a particular product and application. It is concluded that the application of the methods and approaches of FOSA can be very helpful, in addition to the computer simulation and experimental efforts in creating a viable and reliable fiber optics product and that the PDfR approach enables designing and fabricating a viable and reliable optoelectronic product with the predicted, assured and even, when appropriate, even specified adequate probability and the useful lifetime of a photonic product.

Audience Take Away:

  • Compare the results of the calculations based on the application of the addressed analytical ("mathematical") stress-strain and bow modeling with the computer simulation (such as, e.g., finite element analyses (FEA)) data. These two major modeling approaches are based, as a rule, on different assumptions and employ different calculation techniques, and if the data obtained using these approaches are in agreement, tn there is a good reason to believe that these data are accurate and trustworthy.
  • Use the data obtained based on the analytical modeling to create the most accurate and effective preprocessing model, when employing various FEA programs.
  • Use the obtained data to plan, conduct and interpret the results of accelerated tests, including highly accelerated testing (HALT) and failure oriented accelerated testing (FOAT), which is t experimental basis of the PDfR concept.


Ephraim Suhir is  Life Fellow of the IEEE, the ASME, the SPIE, and the IMAPS;  Fellow of the American Physical Society (APS), the Institute of Physics (IoP), UK, and the Society of Plastics Engineers (SPE); and Associate Fellow of the AIAA. He has authored about  500 publications, presented numerous keynote and invited talks worldwide, and received many professional awards. His most recent awards are 2019 IEEE EPS Field award for seminal contributions to mechanical reliability engineering and modeling of electronic and photonic packages and systems and 2019 IMAPS Lifetime Achievement award for making exceptional, visible, and sustained impact on the microelectronics packaging industry and technology.