Sains Malaysiana 32: 87-92 (2003)                                                                                                Sains Fizis dan Gunaan /

Physical & Applied Science

Fabricaion of Fiber Bragg Grating

with an Apodised Phase Mask

Sulaiman Wadi Harun, Prabakaran Poopalan & Harith Ahmad

Physics Department , Faculty of Science

Universiti Malaya, 50603 Kuala Lumpur, Malaysia

ABSTRACT

A fiber Bragg grating (FBG) is fabricated with the aid of an apodised phase mask. The expanded Gaussian beam from a frequency doubled 244 nm CW argon ion laser is used as the UV printing source. A 66% reflectivity FBG was successfully fabricated by this method, however side lobes still appear in the short wavelength side of the spectrum. This condition is attributed to insufficient coverage by non-uniform ultraviolet light over the phase mask.

ABSTRAK

Parutan Bragg gentian (PBG) telah difabrikasi dengan menggunakan topeng fasa terapodisasi. Pancaran UV berbentuk Gaussan dan diperbesarkan dari laser ion argon yang mempunyai panjang gelombang 244 nm telah digunakan dalam ujikaji. PBG yang mempunyai peratus pantulan sebanyak 66% telah berjaya dihasilkan dengan kaedah ini. Walau bagaimanapun, cuping sisi masih lagi dikesan di bahagian jarak gelombang pendek. Kesan ini disebabkan oleh pancaran ultraungu yang tidak sekata dan tidak meliputi sepenuhnya topeng fasa.

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