光纤零色散波长的精确测量

提出了一种测量单模光纤零色散波长的新方法，即让可调谐的连续波（波长λｓ）和波长λｐ位于光纤正常色散区的泵浦脉冲串在光纤中共同传输，交叉相位调制与群速度色散的相互作用可使得连续波的强度得到调制。对连续波λｓ进行调谐，若连续波被调制成亮脉冲，则表明λｓ位于光纤负色散区；若连续波被调制成暗脉冲，则表明λｓ位于光纤正色散区；若连续波的强度不能被调制，则表明λｓ位于光纤的零色散波长λ０附近。利用这一方法对长度为０．９８ｋｍ的色散位移光纤的零色散波长进行了测量，测量精度可达０．５ｎｍ。

Accurate Measurement of Zero-Dispersion Wavelength in an Optical Fiber

A novel method which can directly measure the zero-dispersion wavelength of a single-mode fiber is presented. It consists of copropagating a train of pump pulse with a cw light in an optical fiber. The pump wavelength is located at the normal-dispersion regime of the fiber while the cw wavelength is tunable. The interplay between cross-phase modulation and group-velocity dispersion results in intensity modulation on the cw light which can evolve into a train of bright or dark pulses depending on whether its wavelength is tuned into the anomalous- or normal-dispersion regime of the fiber. If neither bright nor dark pulses are generated, then the cw wavelength must be near the zero-dispersion wavelength of the fiber. By using this simple method, the zero-dispersion wavelength of a 0.98 km dispersion-shifted fiber have successfully been measured with a wavelength accuracy of ～0.5 nm.