9E-1 Limitation and Improvement of Collinear Beam Acousto-Optic Tunable Filters

Based on the analysis of the theoretical and practical limitations of resolution and sidelobe obtainable by using apodization, a new design of the CBAOTF for WDM is proposed. Experimental results of a 65 degree apodized CBAOTF measured at 1550 nm include 3 db bandwidth less than 0.4 nm and sidelobe...

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Bibliographic Details
Published in2007 IEEE Ultrasonics Symposium Proceedings pp. 821 - 824
Main Author Chang, I.C.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.10.2007
Subjects
Acoustic beams
Bandwidth
Frequency estimation
Optical design
Optical device fabrication
Optical filters
Prototypes
Radio frequency
Wavelength division multiplexing
Wavelength measurement
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Summary:Based on the analysis of the theoretical and practical limitations of resolution and sidelobe obtainable by using apodization, a new design of the CBAOTF for WDM is proposed. Experimental results of a 65 degree apodized CBAOTF measured at 1550 nm include 3 db bandwidth less than 0.4 nm and sidelobe level of -25 dB at 0.8 nm away from the center wavelength. The specified sidelobe level of -35 db for the 100 GHz channel spacing can be met by using two apodized CBAOTF in cascade. Other practical limitations include the tight tolerance required in the fabrication and the strong temperature dependent properties of the CBAOTF.A new filter configuration for overcoming these deficiencies is described.
ISBN:1424413834
9781424413836
ISSN:1051-0117
DOI:10.1109/ULTSYM.2007.210