Sains Malaysiana 31: 87-91 (2002)                                                                                Sains Fizis dan Gunaan /

                                                                                                                                Physical and Applied Sciences

Temperature Sensitivity of Fibre Bragg Gratings Fabricated

in High Germania Boron Co-doped Optical Fibre

S.W. Harun, P. Poopalan & H. Ahmad

Physics Department, Faculty of Science

University Malaya

50603 Kuala Lumpur Malaysia

ABSTRACT

The Bragg wavelength drift in fibre Bragg gratings (FBGS) fabricated in high germania boron co-doped optical fibre with respect to temperature variation is studied. The FBG is subjected to temperature variation using an oven. The Bragg wavelength shift with temperature variation is mostly due to thermo­optic effects. The main constituent of the FBG fibre is silica and germanosilicate glass for which the wavelength increases with temperature. The experimental result shows that the thermal response for the FBG is about 0.010 nm^oC, which is consistent with theoretical prediction.

ABSTRAK

Perubahan jarak gelombang Bragg dalam celahan Bragg gentian yang dicetak dalam gentian optik yang mengandungi germanium dan boron yang tinggi terhadap perubahan suhu telah dikaji. Celahan Bragg gentian ini telah dikenakan dengan perubahan suhu di dalam relau. Jarak gelombang Bragg berubah dengan suhu disebabkan oleh kesan termo-optik. Jarak gelombang ini bertambah dengan pertambahan suhu kerana bahan utama dalam celahan Bragg gentian terdiri daripada silika dan germanosilikat kaca. Keputusan ujikaji menunjukkan kadar perubahan jarak gelombang dengan suhu lebih kurang 0.010 nm^oC dan nilai ini adalah sangat hampir dengan teori.

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