Wang Jian, Sun Junqiang, Zhang Xinliang, Huang Dexiu, Fejer M M
Wuhan National Laboratory for Optoelectronics, College of Optelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, China.
Opt Lett. 2008 Aug 15;33(16):1804-6. doi: 10.1364/ol.33.001804.
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.
我们描述了一种通过使用级联二次谐波产生和差频产生（信号设置在准相位匹配波长）来实现周期性极化铌酸锂（PPLN）的新型光学相位擦除特性。推导了一个简单的解析表达式，清晰地解释了其工作原理。有趣的是，这种光学相位擦除特性能够实现从载波抑制归零（CSRZ）到归零（RZ）的全光格式转换。我们通过实验和理论证明了基于PPLN的40 Gbit/s全光CSRZ到RZ格式转换。此外，实验中还验证了可调谐和多播CSRZ到RZ格式转换。
