摘要
对多模光纤的带宽特性进行了分析 ,发现阶跃折射率光纤的带宽只能做到数兆赫·千米 ,而梯度折射率光纤的带宽可达数吉赫·千米。对光纤传输VISAR中的测试信号进行了讨论 ,认为阶跃折射率光纤的带宽已限制了VISAR测试系统的时间分辨本领。提出用渐变折射率光纤代替阶跃折射率光纤 ,可以有效地减小带宽对VISAR测试的限制 ,从而提高系统的频带响应特性。
The effects of the optical fiber bandwidth on VISAR system were investigated.It was estimated that the index stepped multi mode optical fiber could only reach a bandwidth of several MHz·km while the index graded optical fiber could easily reach a bandwidth of several GHz·km.The experimental results confirmed that the index stepped optical fiber did restrict the time resolution of VISAR due to its limited bandwidth.So using the index graded optical fiber,instead of the index stepped fiber,may be an effective way to free the VISAR from the restriction of optical fiber bandwidth and advance the VISAR system.
出处
《高压物理学报》
CAS
CSCD
北大核心
2002年第3期237-240,共4页
Chinese Journal of High Pressure Physics
