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在光通讯技术发展的过程中,光纤波分复用技术是光通讯发展史上的一个里程碑式的进步。目前光波复用技术分简单波分复用WDM,粗波分复用(CWDM),密集型波分复用(DWDM)等几种,简单波分技术WDM也就是使用常用的波长为1310nm/1550nm两个光波复用,目前在光通讯领域正发展的如火如荼。DWDM使用信道间隔0.8nm不同波段的光波在一根光纤中传输,由于成本及技术的限制,目前还在实验阶段,没有在大规模应用。相对而言,当前CWDM技术采用常用的1260～1610nm的波段、信道间隔20nm为一个波长在一根光纤中进行数据传输,由于技术成熟,并且成本相对较低,是当前光通讯领域重点发展的技术。
Optical communication technology in the development process, optical wavelength division multiplexing technology is a milestone in the history of optical communications. At present, the optical multiplexing technology is divided into several types: simple wavelength division multiplexing WDM, coarse wavelength division multiplexing (CWDM) and dense wavelength division multiplexing (DWDM). The simple wavelength division technology WDM uses commonly used wavelengths of 1310 nm / 1550 nm Two optical multiplexing, is currently in the field of optical communications is in full swing. DWDM uses the light wave of different wavelength band of 0.8nm to transmit in a optic fiber, because of the limitation of cost and technology, it is still at experimental stage at present, have not used in the large-scale. In contrast, the current CWDM technology uses the commonly used 1260 ~ 1610nm band, the channel spacing of 20nm for a wavelength in an optical fiber for data transmission, due to mature technology and relatively low cost, is the focus of the current development of optical communications technology .