用锥形耦合器把脉冲CTaAs注入式激光器发出的光耦合到玻璃纤维。当脉冲在波导内传播时,记录纤维内后向散射光和时间的关系。根据这种数据可以确定总损耗,并估计纤维的散射、模式混合特性和纤维的长度。这种方法还可以用来确定(光缆)线路上连接器或故障点的位置及其插入损耗。 A tapered coupler is used to couple the light emitted by the pulsed CTaAs injection laser to the glass fibers. When the pulse is propagating in the waveguide, the relationship between the backscattered light in the fiber and the time is recorded. Based on this data, the total loss can be determined and the fiber scattering, mode-mixing properties and fiber length estimated. This method can also be used to determine the location of the connector or point of failure on the (optical) line and its insertion loss.