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Optical phase erasure and its application to format conversion through cascaded second-order processes in periodically poled lithium niobate

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Abstract

We describe a new optical phase erasure characteristic of periodically poled lithium niobate (PPLN) by using cascaded second-harmonic generation and difference-frequency generation with the signal set at the quasi-phase-matching wavelength. A simple analytical expression is derived clearly explaining the operation principle. It is interesting that the optical phase erasure feature enables an all-optical format conversion from carrier-suppressed return to zero (CSRZ) to return to zero (RZ). We experimentally and theoretically demonstrate a PPLN-based 40Gbitss all-optical CSRZ-to-RZ format conversion. Moreover, tunable and multicasting CSRZ-to-RZ format conversions are also verified in the experiment.

© 2008 Optical Society of America

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