Abstract
A new structure that can realize widely tunable microwave
photonic notch filtering, high free spectral range (FSR), and coherence-free
operation simultaneously, is presented. It is based on a Sagnac loop interferometer
that comprises an off-loop-center electroabsorption modulator, and a wavelength
dependent delay in the Sagnac loop. The structure is simple, and has no coherent
interference or phase induced intensity noise limitations. Experimental results
demonstrate both continuous and discrete widely tunable notch filters, high
frequency and high FSR, and coherence-free low-noise operation with very deep
notches in excess of 40 dB.
© 2008 IEEE
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