March 2022
Intermediate to advanced
864 pages
28h 54m
English
Content preview from Optical Fiber Sensing Technologies
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9Optical Fiber Sensors Based on the SMS Structure
9.1 Theory of SMS Fiber Structure
A typical structure of an single‐mode/multimode/single‐mode (SMS) fiber structure is depicted in Figure 9.1. It is fabricated by connecting a section of multimode fiber (MMF) between two single‐mode fibers (SMFs). Under the linearly polarized (LP) mode approximation, the input mode field of the MMF, i.e. the LP01 mode of the SMF, can be approximated by a Gaussian beam as
where r is the radial coordinate and ω is the mode field radius that can be determined by [1]
(9.2)
where a0 is the radius of the SMF core and
(9.3)
is the normalized frequency of ...
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