Q</italic> value analysis of <bold>microwave photonic filters

doi:10.1007/s12200-009-0019-7

Front Optoelec Chin

2009, Vol. 2

Issue (3) : 269-278 https://doi.org/10.1007/s12200-009-0019-7

RESEARCH ARTICLE

Q value analysis of microwave photonic filters

Lina ZHOU^1,2(

), Xinliang ZHANG², Enming XU²

1. Department of Physics, China University of Geosciences, Wuhan, 430074, China; 2. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

This paper first presents the fundamental principles of the microwave photonic filters. As an example to explain how to implement a microwave photonic filter, a specific finite impulse response (FIR) filter is illustrated. Next, the Q value of the microwave photonic filters is analyzed theoretically, and methods around how to gain high Q value are discussed. Then, divided into FIR filter, first-order infinite impulse response (IIR) filter, and multi-order IIR filter, several novel microwave photonic filters with high Q value are listed and compared. The technical difficulties to get high Q value in first-order IIR filter and multi-order IIR filter are analyzed concretely. Finally, in order to gain higher Q value, a multi-order IIR microwave photonic filter that easily extends its order is presented and discussed.

Keywords microwave photonic filters finite impulse response (FIR) filter first-order infinite impulse response (IIR) filter multi-order infinite impulse response (IIR) filter high Q value

Corresponding Author(s): ZHOU Lina,Email:zln427@sohu.com

Issue Date: 05 September 2009

Cite this article:

Lina ZHOU,Xinliang ZHANG,Enming XU. Q value analysis of microwave photonic filters[J]. Front Optoelec Chin, 2009, 2(3): 269-278.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-009-0019-7
https://academic.hep.com.cn/foe/EN/Y2009/V2/I3/269

Fig.1 Two approaches toward microwave filtering. (a) Traditional filters; (b) photonic filters

Fig.2 Net topology of microwave photonic filters for microwave transmission

Fig.3 Implementation layout of microwave photonic FIR filter

Fig.4 Amplitude-frequency response curve of microwave photonic filter

Fig.5 Net topology of first-order IIR filter

Fig.6 values at various and

Fig.7 Layout of FIR filter for × taps

Fig.8 Layout of FIR filter for taps

Fig.9 Loop structure based on 2×2 coupler and active devices in the loop

Fig.10 F-P structure based on FBG pair and active devices between them

Fig.11 Filter consist of a first-order IIR filter and a third-order FIR filter connected with it in cascade

Fig.12 Amplitude-frequency response curves. (a) Original IIR filter; (b) hybrid filter

Fig.13 Experimental setup for first-order IIR microwave photonic filter based on SOA in loop

Fig.14 Transmission curves. (a) Not using any methods; (b) using methods as setting narrow-band optical filter in loop, and increasing input optical power of loop and bump current of SOA moderately

Fig.15 Two same first-order IIR filters in loop structure are connected in cascade

Fig.16 Second-order IIR filter in parallel structure

Fig.17 Third-order IIR filter consists of a first-order IIR filter and an FBG connected with it

Fig.18 Second-order IIR filter consists of two first-order IIR filters and an SOA between them

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