All-Optical Microwave Filter With High Frequency Selectivity Based on Semiconductor Optical Amplifier and Optical Filter

作者：Xu Enming^*; Zhang Xinliang; Zhou Lina; Zhang Yu; Yu Yuan; Li Xiang; Huang Dexiu

来源：Journal of Lightwave Technology, 2010, 28(16): 2358-2365.

DOI：10.1109/JLT.2010.2045102

• Microwave photonics
• microwave filter
• optical signal processing
• semiconductor optical amplifier

We propose and experimentally demonstrate a novel all-optical microwave filter with high frequency selectivity. It is based on a recirculating delay line (RDL) loop in which a semiconductor optical amplifier (SOA) is followed by a tunable narrow-band optical filter and a 1 x 2 10:90 optical coupler. Converted signal used as a negative tap is generated through wavelength conversion employing the cross-gain modulation (XGM) of the amplified spontaneous emission (ASE) spectrum of the SOA. The converted signal circulating in the RDL loop can realize a high quality factor (Q) response after photo-detection. The 1 x 2 10:90 coupler is employed to extract 10% optical power from the loop as output. A frequency response with a high Q factor of 543, a rejection ratio of 40 dB and a shape factor of 15.4 is experimentally demonstrated.

• 出版日期2010-8-15
• 单位华中科技大学