Hybrid Active-Passive Microwave Photonic Filter with High Quality Factor

作者：Xu En-Ming^*; Zhang Xin-Liang; Zhou Li-Na; Zhang Yu; Huang De-Xiu

来源：Chinese Physics Letters, 2009, 26(9): 094208.

DOI：10.1088/0256-307x/26/9/094208

• INCOHERENT
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A hybrid high quality factor (Q-factor) microwave photonic filter with a cascaded active filter and a passive filter is presented and experimentally demonstrated. The active infinite impulse response filter is realized by a recirculating delay line loop with a semiconductor optical amplifier, and a much narrower 3 dB bandwidth of response peaks can be achieved. A passive finite impulse response filter is realized by an unbalance Mach-Zehnder interferometer, and it is cascaded to select the desired filter frequencies and to suppress the intermediate peaks. Compared with the purely active filter scheme, the free spectrum range and the Q-factor of the hybrid structure can be doubled. Stable operation and a high Q-factor of 362 are experimentally demonstrated.

• 出版日期2009-9
• 单位华中科技大学