| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Hybrid Active-Passive Microwave Photonic Filter with High Quality Factor |
| XU En-Ming, ZHANG Xin-Liang, ZHOU Li-Na, ZHANG Yu, HUANG De-Xiu |
| Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science & Technology, Wuhan 430074 |
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| Cite this article: |
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XU En-Ming, ZHANG Xin-Liang, ZHOU Li-Na et al 2009 Chin. Phys. Lett. 26 094208 |
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Abstract 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 3dB 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.
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| Keywords:
42.30.Lr
42.79.Ci
42.79.Hp
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Received: 27 March 2009
Published: 28 August 2009
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| PACS: |
42.30.Lr
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(Modulation and optical transfer functions)
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42.79.Ci
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(Filters, zone plates, and polarizers)
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42.79.Hp
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(Optical processors, correlators, and modulators)
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