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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兹千米，而梯度折射率光纤的带宽可达数吉赫兹千米。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。Abstract: 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#8226;km while the index-graded optical fiber could easily reach a bandwidth of several GHz#8226;km. The experimental results confirmed that the index-stepped optical fiber did restrict the time resolution of VISAR due to its limited band width. 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.
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Key words:
- bandwidth /
- VISAR /
- optical fiber
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