Department of Engineering Physics Institute Teknologi Sepuluh Nopember Surabaya 60111 IndonesiaAston Institute of Photonics Technologies Aston University Aston Express Way B4&ET Birmigham United Kingdom;
Department of Engineering Physics Institute Teknologi Sepuluh Nopember Surabaya 60111 Indonesia;
Department of Physics Airlangga University Surabaya 60115 Indonesia;
Department of Engineering Physics Institute Teknologi Sepuluh Nopember Surabaya 60111 Indonesia;
Heart rate monitoring; fiber optic sensor; SMS fiber; singlemode-multimode-singlemode fiber; hear rate sensor;