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归零(Rz)码与非归零(NRZ)码是波分复用和时分复用系统中广泛采用的两种码型,全光NRZ到RZ码型转换能完成从波分复用到时分复用的网络接口功能,是未来透明光子网络中一项重要的全光信号处理技术.提出并实验证实了一种基于色散平坦高非线性光子晶体光纤中四波混频效应的单到双NRZ到RZ码型转换方法,将一束信号光与同步时钟脉冲同时输入色散平坦高非线性光子晶体光纤中,通过四波混频过程,产生两个携带该数据信息的闲频光。从而实现了单到双的NRZ到RZ码型转换功能,码型转换器工作波长在193 nm范围可调谐,最大转换效率为-21 dB,最优消光比和品质因子分别为11.9 dB和7.2.该方法的特点在于基于光纤中的四波混频效应工作,因而具有对调制格式和比特率透明的优点,同时,光子晶体光纤特有的高非线与色散平坦性,既避免了使用传统光纤需要较长的长度,又避免了波长设置不灵活的弊端,并具备可进一步增加带宽的能力,且在码型转换的同时,实现了波长转换,完成了双通道波长组播功能.整个系统为全光纤设计,结构简单,性能可靠,并易于与现有的光纤通信系统相容,对促进超高速大容量光子网络的发展具有重要意义.
Zero return (Rz) code and non-return to zero (NRZ) codes are widely used in WDM and TDM systems. The all-optical NRZ to RZ code conversion can be completed from WDM to TD Multiplexed network interface function is an important all-optical signal processing technology in transparent photonic networks in the future.An single-to-dual NRZ based on four-wave mixing effect in flattened and highly nonlinear photonic crystal fiber is proposed and experimentally demonstrated. To the RZ pattern conversion method, a signal light and a synchronous clock pulse are simultaneously inputted into the dispersion-flattened high-nonlinearity photonic crystal fiber, and two idler lights carrying the data information are generated through a four-wave mixing process. Thus, the single-to-double NRZ to RZ code conversion function is realized. The working wavelength of the code converter is tunable in the 193 nm range with a maximum conversion efficiency of -21 dB and an optimal extinction ratio and quality factor of 11.9 dB and 7.2, respectively. This method is characterized by the fact that it operates based on the four-wave mixing effect in an optical fiber and thus has the advantage of being transparent to the modulation format and the bit rate while the unique high nonlinearity and dispersion flatness of the photonic crystal fiber both avoids the need for using traditional optical fibers The longer length avoids the drawbacks of inflexible wavelength setting and possesses the capability of further increasing the bandwidth, and at the same time the pattern conversion, the wavelength conversion is realized and the dual-channel wavelength multicasting function is completed. Optical fiber design, simple structure, reliable performance, and easy to compatible with the existing optical fiber communication system, to promote the development of ultra-high-speed high-capacity photonic network is of great significance.