Abstrak Pada studi ini telah dilakukan penelitian tentang pengukuran level ketinggian air menggunakan Fiber Bragg Grating (FBG). Pengukuran ini dilakukan dengan cara meregangkan FBG menggunakan kantilever yang dikaitkan dengan pelampung. Peregangan menyebabkan perioda kisi-kisi FBG berubah dan selanjutnya mempengaruhi respon transmisi cahaya yang merambat didalamnya. Pada penelitian ini, level ketinggian air diukur dengan cara mendeteksi respon intensitas cahaya laser dioda yang ditransmisikan

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... elalui FBG. Panjang gelombang laser dioda dan panjang gelombang Bragg FBG yang digunakan berturut-turut yaitu 1553,96 nm dan 1554 nm. Hasil penelitian menunjukkan bahwa terdapat hubungan linier antara respon intensitas cahaya laser dioda dengan level ketinggian air. Sensitivitas dan resolusi pengukuran berturut-turut 0,69 dbm/mm dan 1 mm. Kata-kata kunci: Fiber bragg grating, sensor level ketinggian air, modulasi intensitas laser dioda. Abstract Measurement of water level use Fiber Bragg Grating (FBG) was studied. The measurement was done by straining FBG use cantilever which connected to the cork. By straining of the FBG, grating period will have changed and further affect the transmission response of the propagated light. In this study, the water levels were measured by detect intensity of transmitted laser diode. Wavelength of laser diode and FBG Bragg wavelength were 1553.96 nm and 1554 nm, respectively. The results showed that there is a linear relationship between intensity of transmitted laser diode with the water levels. Sensitivity and resolution were 0.69 dBm/ mm and 1 mm, respectively.