Bare fiber strain sensor and packaged strain sensor of a step-index singimode-multimode-singlemode (SMS) fiber structure are investigated numerically and experimentally. Strain sensor packaging was done to protect optical fiber from the damaged. Sensor performance was investigated by using operation wavelength 1550 nm it is demonstrated that for strain measurement from 0-1060 με Based on the numerical test the sensitivity of bare fiber strain sensor on the length of 44.35 mm is 0.0023 dBm/με while the result of the experiment test is 0.0022 dBm/ με. Based on the numerical test of packaged fiber strain sensor the sensitivity is 0.0021 dBm/ με while the result of the experiment is 0.0015 dBm/ με.
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