Microwave photonic single-passband filter with highly flexible tunability of bandwidth and frequency

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• 关键词：Microwave filters ; Microwave photonics ; Fiber Bragg grating
• 刊名：Optical Fiber Technology
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：33
• 期：Complete
• 页码：51-55
• 全文大小：950 K
• 卷排序：33

文摘

A microwave photonic single-passband filter with highly flexible tunability of bandwidth and frequency is proposed and demonstrated. Two different light waves with their polarizations aligned with two principal axes of a polarization modulator are modulated, and two phase-modulated signals with opposite phase modulation indices are generated. Two different lower parts of the lower sidebands are removed by a fiber Bragg grating to convert two phase-modulated signals into two intensity-modulated signals. Two high-pass frequency responses with different cut-off frequencies are realized. Since the two converted intensity-modulated signals are out of phase, the overlapped frequency responses are cancelled, and a single-passband filter is realized. The bandwidth and the central frequency can be tuned independently by properly adjusting the two wavelengths simultaneously. Furthermore, both the bandwidth and the central frequency can be simultaneously tuned by adjusting one of the two wavelengths.