title: Optical phase erasure and its application to format conversion through cascaded second-order processes in periodically poled lithium niobate.
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 40 Gbits/s all-optical CSRZ-to-RZ format conversion. Moreover, tunable and multicasting CSRZ-to-RZ format conversions are also verified in the experiment.
authors: Wuhan National Laboratory for Optoelectronics, College of Optelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, China.
authors: Jian
authors: J
authors: Wang
authors: Junqiang
authors: J
authors: Sun
authors: Xinliang
authors: X
authors: Zhang
authors: Dexiu
authors: D
authors: Huang
authors: M M
authors: MM
authors: Fejer