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

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Abstract

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.

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Authors and Affiliations

  1. School of Optoelectronic Engineering, Nanjing University of Posts and Telecommunications, Nanjing, 210046, China

    En-ming Xu  (徐恩明) & Pei-li Li  (李培丽)

  2. School of Optoelectronic Information, Chongqing University of Technology, Chongqing, 400054, China

    Fei Wang  (王飞)

Authors
  1. En-ming Xu  (徐恩明)
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  2. Fei Wang  (王飞)
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  3. Pei-li Li  (李培丽)
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Corresponding author

Correspondence to En-ming Xu  (徐恩明).

Additional information

This work has been supported by the National Natural Science Foundation of China (No.61007064), the Jiangsu Natural Science Foundation (No.BK2012432), the Ph.D. Programs Foundation of the Ministry of Education of China (No.BJ212016), and the Scientific Research Foundation of Nanjing University of Posts and Telecommunications (No.NY211017).

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Xu, Em., Wang, F. & Li, Pl. A cascaded microwave photonic filter based on a low-coherence infinite-impulse-response filter. Optoelectron. Lett. 9, 165–168 (2013). https://doi.org/10.1007/s11801-013-3009-3

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  • DOI: https://doi.org/10.1007/s11801-013-3009-3

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