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Optical Engineering

Key factors in getting high Q values for finite- and infinite-impulse-response microwave photonic filters
Author(s): Chunhui Qi; Pei Li; Tigang Ning; Jing Li; Song Gao
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Paper Abstract

In this brief-article the effect of the number of taps on the quality (Q) for infinite- and finite-impulse-response microwave photonic filters (IIRMPFs and FIRMPFs) is analyzed. For FIRMPFs, an increas of Q with the number of taps from 2 to 10 is deduced by analyzing the free spectrum ranges with 3-dB bandwidths. For IIRMPFs, a pretty high Q can be realized when the product of the coefficient and the gain in the feedback loop equals 1. Our analytical results are verified by a typical IIRMPF structure based on a fiber Bragg grating (FBG), and the Q value can be increased up to 804 by using two FBGs with reflectivities of 50% and 99.5%, respectively.

Paper Details

Date Published: 1 June 2010
PDF: 6 pages
Opt. Eng. 49(6) 065007 doi: 10.1117/1.3454388
Published in: Optical Engineering Volume 49, Issue 6
Show Author Affiliations
Chunhui Qi, Beijing Jiaotong Univ. (China)
Pei Li, Beijing Jiaotong Univ. (China)
Tigang Ning, Beijing Jiaotong Univ. (China)
Jing Li, Beijing Jiaotong Univ. (China)
Song Gao, Beijing Jiaotong Univ. (China)

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