Abstract
We achieved apodization in a quasi-phase-matched (QPM) wavelength converter by changing the duty cycle of a grating. The new design yields a large bandwidth and a flat phase-matching response with high conversion efficiency. Widely tunable -band difference frequency generation was realized using an apodized QPM ridge waveguide. We also demonstrated the simultaneous detection of the absorption lines of and and obtained a broadband absorption spectrum of over using the widely tunable source.
© 2009 Optical Society of America
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