Controller Design Of Tunable Fiber Fabry-Perot Filter And Its Application In RoF Links

With substantial growth of people's information needs, the Wavelength Division Multiplexing(WDM) technology is widely used. As a key component of the WDM system, the tunable optical filter can select one wavelength from a certain wavelength range. So it has a good performance in filtering. And because of the characteristic of low insert loss, wide FSR and rapid tuning, people paid more attention on the application of tunable optical filter.In this paper, we introduced the present situation of the tunable optical filter and the characteristic among different kinds. In order to achieve the control of the tunable fiber Fabry-Perot filter made by Micro Optics Company, we desighed a circuit based on C8051F320 MCU. And then, we propose and experimentally demonstrate a cost-effective and tunable method to simultaneously implement PM-IM conversion and efficiency improvement for fiber-optic links by employing a fiber Fabry-Perot tunable filter and its controling circuit. The results demonstrate that the PM-IM conversion has been achieved and an about 10 dB gain of electrical signal power could be obtained with suitable optical carrier suppression for both 10 GHz and 20 GHz microwave input.