Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/7631
Title: Ultrahigh-Q microwave photonic filter with tunable Q value utilizing cascaded optical-electrical feedback loops
Authors: Liu, J
Guo, N
Li, Z
Yu, C
Lu, C 
Issue Date: 2013
Publisher: Optical Society of America
Source: Optics letters, 2013, v. 38, no. 21, p. 4304-4307 How to cite?
Journal: Optics letters 
Abstract: A microwave photonic filter with the highest reported quality factor (Q) value of 4895.31 is proposed and experimentally demonstrated by using two cascaded infinite impulse response (IIR) filters. Each IIR filter comprises both optical and electronic signals in a feedback loop and thus the loop length can be reduced without the need to consider the light coherence length. The Vernier effect enables a significant improvement of the free spectral ranges and Q values of the cascaded filter. The Q value of the proposed microwave photonic filter can be changed when the loop lengths of two cascaded filters are carefully adjusted. In addition, for a fixed Q, the frequency response of the filter can also be tuned by adjusting the bias of the Mach-Zehnder modulator in each loop.
URI: http://hdl.handle.net/10397/7631
ISSN: 0146-9592
EISSN: 1539-4794
DOI: 10.1364/OL.38.004304
Appears in Collections:Journal/Magazine Article

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