光纤色散测量概述

介绍了三种最为成熟的光纤色散测量方法:时延法、相移法和干涉法,并从色散测量原理、测量装置、适用范围以及优缺点等几方面进行了论述.时延法测量精度不高,目前较少采用;相移法测量精度高,但测量仪器价格昂贵,测量成本高;干涉法既能满足一定的测量精度要求(时间分辨率可达1ps),又控制了测量成本,是普遍采用的测量方法.

Chromatic dispersion measurement of optical fibers

With the continuous enhancement of transmission speed in fiber-optic communication systems, the measurement of chromatic dispersion in fibers increasingly becomes a focus of attention. This paper mainly introduces three of the most important approaches, which are utilized to take accurate measurements of chromatic dispersion, from the aspects of principle, measurement setup, applicable field, advantages and disadvantages. These approaches include pulse delay method, phase-shift method and interferometric method. The pulse delay method is not accurate enough, so it is barely used now. Accurate measurements of chromatic dispersion can be taken using phase-shift method; however, the measurement cost is very high due to costly instruments involved. The interferometric method can meet the needs of accuracy to a certain extent and the temporal resolution can be better than 1ps. Also this method doesn't require costly instruments, so it is widely used at present.