Multitap photonic microwave filters with arbitrary positive and negative coefficients using a polarization modulator and an optical polarizer

作者：Wang Qing^*; Yao Jianping

来源：IEEE Photonics Technology Letters, 2008, 20(1-4): 78-80.

DOI：10.1109/LPT.2007.912562

• microwave photonics
• optical processing of microwave signals
• photonic microwave filter
• polarization modulation

A novel multitap photonic microwave filter with arbitrary positive and negative coefficients implemented using an electrooptic polarization modulator (PolM) and an optical polarizer is proposed and experimentally demonstrated. In the proposed filter, the optical polarizer is connected at the output of the PolM with its transmission axis aligned at an angle of 45 degrees to one principal axis of the POIM. By adjusting the polarization direction of the input lightwave to be 45 degrees or 135 degrees to one principal axis of the PolM, an inverted or noninverted intensity-modulated optical microwave signal is obtained at the output of the optical polarizer, which leads to the generation of a negative or positive coefficient. A time delay difference between adjacent taps is generated by using a wavelength-dependent delay line. A five-tap photonic microwave filter with arbitrary positive and negative coefficients is demonstrated. The reconfigurability of the filter is also investigated.

• 出版日期2008-2