A cascaded microwave photonic filter based on a low-coherence infinite-impulse-response filter

作者：Xu En ming^*; Wang Fei; Li Pei li

来源：Optoelectronics Letters, 2013, 9(3): 165-168.

DOI：10.1007/s11801-013-3009-3

• Amplified spontaneous emission spectrum
• Cascaded filters
• Cross gain modulation
• Free spectral range
• Low-coherence
• Mach-Zehnder
• Microwave photonic filters
• Q-factors

A cascaded filter combining active and passive filters is proposed. The active filter acts as a low-coherence infinite-impulse-response (IIR) filter and achieves a sharp frequency response. The low-coherence IIR filter is realized by employing the cross-gain modulation (XGM) of the amplified spontaneous emission (ASE) spectrum of the semiconductor optical amplifier (SOA). The passive filter is an n-section unbalance Mach-Zehnder (UMZ) structure, which is used to increase free spectral range (FSR) and Q factor further. The low-coherence IIR filter cascaded with one section of UMZ passive filter is experimentally demonstrated, and a Q factor of 1268 is obtained.

• 出版日期2013
• 单位南京邮电大学