A cascaded microwave photonic filter based on a low- coherence infinite-impulse-response filter

A cascaded filter combining active and passive filters is proposed. The active filter acts as a low-coherence infi- nite-impulse-response （IIR） filter and achieves a sharp frequency response. The low-coherence IIR filter is realized by employing the cross-gain modulation （XGM） of the amplified spont...

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Bibliographic Details
Published in:Optoelectronics letters 2013-05, Vol.9 (3), p.165-168
Main Authors: Xu, En-ming, Wang, Fei, Li, Pei-li
Format: Article
Language:English
Subjects:
IIR滤波器
Lasers
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
低相干
半导体光放大器
微波光子
放大的自发辐射
无源滤波器
无限脉冲响应滤波器
级联
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Summary:A cascaded filter combining active and passive filters is proposed. The active filter acts as a low-coherence infi- nite-impulse-response （IIR） filter and achieves a sharp frequency response. The low-coherence IIR filter is realized by employing the cross-gain modulation （XGM） of the amplified spontaneous emission （ASE） spectrum of the semicon- ductor optical amplifier （SOA）. The passive filter is an n-section unbalance Mach-Zehnder （UMZ） structure, which is used to increase free spectral range （FSR） and Q factor further. The low-coherence IIR filter cascaded with one section of UMZ passive filter is experimentally demonstrated, and a Q factor of 1268 is obtained.
ISSN:1673-1905
1993-5013
DOI:10.1007/s11801-013-3009-3