More accurate coupling function approach for optical transducers based on power coupling between multimode fibers

1999 ◽  
Author(s):  
A. Cobo
Keyword(s):  
Coupling Function ◽  
Function Approach ◽  
Multimode Fibers ◽  
Power Coupling ◽  
Optical Transducers

scholarly journals An Analytical Model for Describing the Power Coupling Ratio between Multimode Fibers with Transverse Displacement and Angular Misalignment in an Optical Fiber Bend Sensor

Sensors ◽  
2019 ◽  
Vol 19 (22) ◽  
pp. 4968
Author(s):  
Wern Kam ◽  
Yong Sheng Ong ◽  
Sinead O’Keeffe ◽  
Waleed S. Mohammed ◽  
Elfed Lewis
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Theoretical Calculations ◽  
Optical Fiber Sensor ◽  
Coupling Efficiency ◽  
Transverse Displacement ◽  
Coupling Ratio ◽  
Angular Misalignment ◽  
Multimode Fibers ◽  
Power Coupling

The power coupling ratio between step-index multimode fibers caused by combined transversal and angular misalignment is calculated. A theoretical description of the coupling efficiency between two optical fibers based on geometrical optics is provided. The theoretical calculations are collaborated by experiments, determining the power coupling ratio between three output fibers with an axial offset and angular misalignment with a single input fiber. The calculation results are in good agreement with experimental results obtained using a previously fabricated optical fiber sensor for monitoring physiological parameters in clinical environments. The theoretical results are particularly beneficial for optimizing the design of optical fiber bending sensors that are based on power coupling loss (intensity) as the measurement interrogation requires either axial displacement, angular misalignment, or both.

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