Tunable sharp and highly selective microwave-photonic band-pass filters based on stimulated Brillouin scattering

被引:89
作者
Stern, Yonatan [1 ]
Zhong, Kun [1 ,2 ]
Schneider, Thomas [3 ]
Zhang, Ru [2 ]
Ben-Ezra, Yossef [4 ]
Tur, Moshe [5 ]
Zadok, Avi [1 ]
机构
[1] Bar Ilan Univ, Fac Engn, IL-5290002 Ramat Gan, Israel
[2] Beijing Univ Posts & Telecommun, Beijing 100876, Peoples R China
[3] Hsch Telekommunikat, Inst Hochfrequenztechn, D-04277 Leipzig, Germany
[4] Holon Inst Technol, Fac Engn, IL-5810201 Holon, Israel
[5] Tel Aviv Univ, Fac Engn, Sch Elect Engn, IL-6997801 Tel Aviv, Israel
来源
PHOTONICS RESEARCH | 2014年 / 2卷 / 04期
基金
中国国家自然科学基金; 以色列科学基金会;
关键词
SINGLE-MODE FIBERS; SLOW-LIGHT; OPTICAL-FIBERS; COMPLEX COEFFICIENTS; GAIN SPECTRUM; DELAY-LINES; SIGNALS; MODULATION; DISTORTION; NARROW;
D O I
10.1364/PRJ.2.000B18
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Stimulated Brillouin scattering (SBS) in optical fibers has long been used in frequency-selective optical signal processing, including in the realization of microwave-photonic (MWP) filters. In this work, we report a significant enhancement in the selectivity of SBS-based MWP filters. Filters having a single passband of 250 MHz-1 GHz bandwidth are demonstrated, with selectivity of up to 44 dB. The selectivity of the filters is better than that of the corresponding previous arrangements by about 15 dB. The shape factor of the filters, defined as the ratio between their -20 dB bandwidth and their -3 dB bandwidth, is between 1.35 and 1.5. The central transmission frequency, bandwidth, and spectral shape of the passband are all independently adjusted. Performance enhancement is based on two advances, compared with previous demonstrations of tunable SBS-based MWP filters: (a) the polarization attributes of SBS in standard, weakly birefringent fibers are used to discriminate between in-band and out-of-band components and (b) a sharp and uniform power spectral density of the SBS pump waves is synthesized through external modulation of an optical carrier by broadband, frequency-swept waveforms. The signal-to-noise ratio of filtered radio-frequency waveforms and the linear dynamic range of the filters are estimated analytically and quantified experimentally. Lastly, a figure of merit for the performance of the filters is proposed and discussed. The filters are applicable to radio-over-fiber transmission systems. (C) 2014 Chinese Laser Press
引用
收藏
页码:B18 / B25
页数:8
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