Multi-Stopband Microwave Photonic Filter Based on Stimulated Brillouin Scattering

Yiming Xu; Wei Pan; Bing Lu; Ge Yu

doi:10.3788/CJL201845.1106004

Chinese Journal of Lasers, Volume. 45, Issue 11, 1106004(2018)

Multi-Stopband Microwave Photonic Filter Based on Stimulated Brillouin Scattering

Yiming Xu^*, Wei Pan, Bing Lu, and Ge Yu

Author Affiliations

College of Information Science and Technology, Southwest Jiaotong University, Chengdu, Sichuan 611756, China

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Figures & Tables(11)

Fig. 1. Schematic of MPF structure

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Fig. 2. Principle diagram of multiple stopbands MPF based on SBS. (a) Multi-frequency pump; (b) spectral response with multi-stopband based on SBS

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Fig. 3. Experimental structure of multi-stopband MPF

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Fig. 4. System frequency responses with different RF signals. (a) Single stopband; (b) two stopbands; (c) three stopbands; (d) four stopbands

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Fig. 5. Frequency-tunability of double stopbands

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Fig. 6. MPF spectral responses with different powers of RF tones. (a) Original MPF spectral response; (b) spectral response only when the power of 5.5 GHz RF signal is amplified; (c) spectral response only when the power of 5.0 GHz RF signal is amplified; (d) spectral response only when the power of 4.5 GHz RF signal is amplified

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Fig. 7. System spectral responses when EA gain is (a) 18.0 dB; (b) 18.5 dB; (c) 19.0 dB; (d) 19.5 dB

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Table 1. Stopbands with different radio frequency signals

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Table 1. Stopbands with different radio frequency signals

Numberof stopbands	Componentfrequency /GHz	Stopband centralfrequency /GHz	Stopband rejectionratio /dB	Stopband 6 dBbandwidth /MHz
1	4.5	4.56	48.5	33.0
2	4.5	4.56	37.9	33.0
2	5.0	4.06	35.9	33.0
3	4.5	4.56	30.9	32.9
	5.0	4.06	30.9	33.0
	5.5	3.56	27.4	32.9
4	4.0	5.06	25.1	32.9
	4.5	4.56	21.4	32.9
	5.0	4.06	21.6	32.6
	5.5	3.56	22.6	32.7

Table 2. MPF stopbands when two radio frequency components are changed

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Table 2. MPF stopbands when two radio frequency components are changed

f₁ /GHz	f_{N_1} /GHz	f_{6 dB_1} /GHz	R₁ /dB	f₂ /GHz	f_{N_2} /GHz	f_{6 dB_2} /GHz	R₂ /dB
4.5	4.56	33.3	23.9	7.0	2.06	33.5	33.4
4.5	4.56	33.3	24.3	6.0	3.06	32.6	28.4
4.5	4.56	33.3	23.9	5.0	4.06	33.8	38.8
4.5	4.56	33.4	26.1	3.5	5.56	33.3	30.8
4.5	4.56	33.3	23.9	2.5	6.56	33.3	37.9
4.5	4.56	33.4	27.1	1.0	8.06	33.3	34.9

Table 3. Out-of-band rejections based on different powers of RF tones

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Table 3. Out-of-band rejections based on different powers of RF tones

Power	Out-of-band rejection of stopband /GHz
Power	Stopband 1	Stopband 2	Stopband 3	Stopband 4
For Fig. 6(a)	20.95	26.54	21.31	27.87
For Fig. 6(b)	31.32	18.30	18.55	25.36
For Fig. 6(c)	26.68	23.02	16.01	19.59
For Fig. 6(d)	21.87	20.71	20.86	17.79

Table 4. Out-of-band rejections based on different EA power gains
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Table 4. Out-of-band rejections based on different EA power gains
EA gain /dB Out-of-band rejection of stopband /GHz
Stopband 1 Stopband 2 Stopband 3 Stopband 4
18.0 17.95 17.46 18.34 19.27
18.5 21.86 20.72 20.86 20.79
19.0 22.56 21.58 21.37 25.08
19.5 25.36 32.89 48.95 27.06

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Yiming Xu, Wei Pan, Bing Lu, Ge Yu. Multi-Stopband Microwave Photonic Filter Based on Stimulated Brillouin Scattering[J]. Chinese Journal of Lasers, 2018, 45(11): 1106004

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