We have developed a Fresnel diffraction analysis that provides an analytic expression for the passband response of virtually imaged phased-array (VIPA) demultiplexers. Our analysis shows that although the passband can be inherently symmetric, a strong asymmetry can develop when the output plane is detuned longitudinally. The symmetric passband has the minimum -3 dB transmission bandwidth. We also identify a spatial chirp effect that arises when the passband becomes asymmetric. Our theoretical predictions are confirmed via experiment. The experimental results include a demonstration of a hyperfine wavelength demultiplexing response with 10 pm (1.25 GHz) -3 dB transmission bandwidth.
© 2005 IEEE
Shijun Xiao, Andrew M. Weiner, and Christopher Lin, "Experimental and Theoretical Study of Hyperfine WDM Demultiplexer Performance Using the Virtually Imaged Phased-Array (VIPA)," J. Lightwave Technol. 23, 1456- (2005)