B. Developing a 3dB coupler, namely the coupling ratio is 50%, with working wavelength of 1550nm, and testing its parameters.
B．研制工作波长为1550nm的3dB(即分光比为50％)耦合器，并对其参数进行检测。
参考来源 - 熔锥型单模光纤耦合器的传感特性研究·2,447,543篇论文数据，部分数据来源于NoteExpress
红外测温中需要选择合适的工作波长。
The proper working wavelengths should be selected in infrared thermometry.
通过对大气信道方面的研究，给出了FSO系统工作波长的选择原则。
Through the research on atmospheric channel aspect, the selection principles of FSO operating wavelength are shown.
做为例子，对一具口径9.2米，工作波长4毫米的综合设备进行了具体分析。
For example, a synthetic instrument with aperture of 9.2m and wave length of 4mm is specifically analysed.
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