用MCVD和VAD之类方法制造的光纤已显示出最佳的特性。不过采用这些方法生产母棒的速度不能令人满意。为了发展一种更经济的工艺,我们(日本日立公司——译注)一直在研究所谓的“溶胶——凝胶工艺”,即众所周知的非熔融的玻璃合成法,并用来制造低损耗光纤。 Fibers made using methods such as MCVD and VAD have shown the best properties. However, the rate of production of mother rods by these methods is unsatisfactory. In order to develop a more economical process, we (Hitachi, Ltd.) have been studying the so-called “sol-gel process,” a process known as non-fused glass synthesis, used to make low loss optical fibers.