看起来非常确定的事情是：没有信号，更不用说物质，可以比光传播的速度快。
For it seems as certain as anything can be that no signal-still less any material object-can ever travel faster than light.
尽管先前的研究已经证实，光的“群速度”可以超越光速c，而“信号传播速度”——光携带的信息的传播速度——不能超越光速。
Although previous studies have found that the "group velocity" of light can travel faster than c, the "signal velocity" -the speed at which information travels -cannot.
尽管先前的研究已经证实，光的“群速度”可以超越光速c，而“信号传播速度”——光携带的信息的传播速度——不能超越光速。
Although previous studies have found that the "group velocity" of light can travel faster than c, the "signal velocity" - the speed at which information travels - cannot.
信号以光的速度传播。
通信延迟包括遥控指令的延迟和遥测信号的延迟，主要是由光传播速度造成的。
The communication time-delay concludes the delay of remote control commands and telemetry signals, which is brought by light transportation speed.
从光放大器108和104出去的拉曼泵浦信号沿着邻近的段传播，如图1中所示。
The Raman pump signals from optical amplifier 108 and 104 propagate in spans contiguous to that shown in FIG. 1.
在其它的实施例中，第一光泵浦信号与光数据信号同向传播，而第二光泵浦信号与光数据信号反向传播。
In yet other embodiment, a first optical pumping signal co-propagates with the optical data signals and a second optical pumping signal counter-propagates with the optical data signals.
每一个在WD M光通信系统中传播的光信号在光放大器的增益光谱内都占有其各自的波长。
Each optical signal propagating in the WDM optical communications system occupies its own wavelength within the gain spectrum of the optical amplifier.
拉曼光泵浦信号放大在光纤段206上传播的光数据信号。
The Raman optical pumping signal amplifies the optical data signals propagating on the optical fiber span 206.
在其它实施例中，光泵浦信号在光纤段中与光数据信号反向传播。
In other embodiments, the optical pumping signal counter-propagates in the optical fiber span with the optical data signals.
光耦合器424沿着与光源402产生的光数据信号同向传播的方向发射拉曼光泵浦信号。
The optical coupler 424 launches the Raman optical pumping signal in a direction that co-propagates with the optical data signals that are generated by the optical source 402.
光耦合器424沿着与光源402产生的光数据信号同向传播的方向发射拉曼光泵浦信号。
The optical coupler 424 launches the Raman optical pumping signal in a direction that co-propagates with the optical data signals that are generated by the optical source 402.
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