Key factors in getting high Q values for finite- and infinite-impulse-response microwave photonic filters

Chunhui Qi; Pei Li; Tigang Ning; Jing Li; Song Gao

doi:10.1117/1.3454388

1 June 2010 Key factors in getting high Q values for finite- and infinite-impulse-response microwave photonic filters

Chunhui Qi, Pei Li, Tigang Ning, Jing Li, Song Gao

Author Affiliations +

Optical Engineering, Vol. 49, Issue 6, 065007 (June 2010). https://doi.org/10.1117/1.3454388

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.

©(2010) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Chunhui Qi, Pei Li, Tigang Ning, Jing Li, and Song Gao "Key factors in getting high Q values for finite- and infinite-impulse-response microwave photonic filters," Optical Engineering 49(6), 065007 (1 June 2010). https://doi.org/10.1117/1.3454388

Published: 1 June 2010

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