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Zinc is one of the important material in human blood because of its effect in defensive system work for properly and it plays an important role in growth, wound healing Medically zinc concentration effect directly in skin health so it's important to make a sensor for discover zinc and its concentration change in human blood for each of male and female. Optical fibers are used as a sensor for detecting zinc and its concentration by transmitted laser signal through the optical fiber by using different types (single mode fiber SMF, photonic crystal fiber PCF) by studying the results of output laser the detection can be seen for zinc concentration change, the design of small PCF which the same LMA_10 but smaller in its radius of core and cladding even the distance between cores. The smallest PCF size has the best detection for all zinc concentration change in blood all that was done by comsol Multiphysics 5.4 simulation program

This paper provides securing flowing of data in optical systems through encoding and steganography. Encoding (Cryptography) and steganography are major elements for secure the data. Suggested communication system aids for transporting huge volumes of information of quickly and reliably. This communication system has previously displayed unrivalled characteristics of most secure. Secure connection requires the integration of cryptography and steganography, so it is very difficult to penetrate it. The system program uses cryptography and steganography to merge any type from files and encrypted text that are effectually hidden for human eye with a carrier image. Also, the extra purpose from this paper is to procure the threshold losses of the optical system and introduce a new approach to create an ideal system that can effectively secrete a message that includes important information, if and only if the optical cable losses increase by its threshold magnitude.

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A diaphragm-based Fapry-Perot interferometry (FPI) fiber optic sensor that uses a super luminescent emitting diode (SLED) source was designed and tested for on-line detection of the acoustic waves. The single-mode fiber (SMF) and a diaphragm use as sensors, SMF captured in a glass tube to form an extrinsic Fabry–Perot interferometer (FPI). Investigation fallouts show that this optical fiber acoustic-optics sensor is suitable and efficient for sensing acoustic signals by the vibrated diaphragm and the advantage fiber has a high bandwidth and sensitivity.