Design and Construction Optical Fiber Fabry Perot Filter with Tunable Two FBG Cavities


Tahreer S. Mansour


Institute of Laser for Postgraduate Studies, Photonics unit, University of Baghdad, Baghdad, Iraq.

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Narrow band pass filter is an essential part in advanced optical fiber communication system for enhancing the system performance. This enhancement done when the band pass filter designed using special type of fiber that is called fiber Bragg grating which has the ability of mitigation two types of noises that are relative intensity noise and phase intensity noise. In this work this tunable band pass Fabry –Perot filters were designed and formed using two cavities. The first cavity was constructed after connections two identical fiber Bragg grating but the second cavity has non identical fiber Bragg grating. Tunability of these two band pass filters were done after applying mechanical forces on these two cavities and measured the elongation in micro starin. The first cavity has a maximum power reflection 4.58 nW which higher than the power reflection 2.02 nW in the second cavity both these reflections are taken in the case of 4000 g mechanical forces. The optical band pass filter has two bandwidths which are related to the Fabry-Perot’s dual cavities that are 189.487 and 74.808 pm for cavity1 and cavity2 respectively. cavity 1 has maximum bandwidth because the two FBGs that form the second cavity is not identical.