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Structure of WDM system

Source: | Author:Daniel | Published time: 2023-07-04 | 347 Views | Share:
WDM (Wavelength Division Multiplexing) technology can couple multiple optical signals into one optical fiber for transmission, which can greatly reduce the density of optical fiber wiring and save optical fiber resources.

     1. Basic structure of WDM (wavelength division multiplexing)  

       

The basic composition of the WDM system is mainly divided into two modes: dual-fiber one-way transmission and single-fiber two-way transmission. 

Dual-fiber unidirectional means that all optical paths are transmitted in the same direction on one optical fiber at the same time, and different wavelengths carry different optical signals, which are combined at the sending end and transmitted through one optical fiber, and demultiplexed at the receiving end to complete multiplexing. The transmission of optical signals, while the opposite direction is transmitted through another optical fiber. The transmission in two directions is completed by two optical fibers respectively. 

Single-fiber bidirectional means that the optical path is simultaneously transmitted in two different directions on one main fiber, and the wavelengths used are separated from each other to achieve full-duplex communication between the two parties.




2. The advantages of  WDM system 

   

 1 st,  High capacity

WDM has good compatibility with different signals. When transmitting signals of different natures such as images, data and voice in the same optical fiber, each wavelength is independent of each other and does not interfere with each other, ensuring the transparency of transmission.



 2 nd,  Good compatibility

WDM has good compatibility with different signals. When transmitting signals of different natures such as images, data and voice in the same optical fiber, each wavelength is independent of each other and does not interfere with each other, ensuring the transparency of transmission.



 3 rd,  High network flexibility, economy and reliability

WDM technology allows for easier upgrades by allowing new channels to be connected as needed without disrupting existing traffic service. When upgrading and expanding the network, there is no need to modify the optical cable line, and new services can be opened or superimposed by adding wavelengths, saving a lot of optical fibers and 3R regenerators during long-distance transmission with large capacity, and the transmission cost is significantly reduced.



    FWDM     CEx WDM     CWDM OADM     DWDM OADM     CWDM Mux/Demux    DWDM Mux/Demux


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