A theoretical study of a new application of a simple π-phase-shifted waveguide Bragg grating (PSWBG) in reflection mode as a high-speed optical dark-soliton detector is presented. The PSWBG consists of two concatenated identical uniform waveguide Bragg gratings with a π phase shift between them. The reflective PSWBG, with grating reflectivities equal to 0.9, a free spectral range of , and a nonlinear phase response, can convert a noisy dark-soliton signal into a high-quality return-to-zero signal with a peak power level of greater than that by the existing Mach–Zehnder interferometer with free spectral range of and a linear phase response.
© 2007 Optical Society of America
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