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Introduction of WDM system

Source: | Author:Daniel | Published time: 2023-07-01 | 343 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. What is WDM (wavelength division multiplexing)?

       

    The technology of simultaneously allowing two or more optical wavelength signals to transmit information through different optical channels in the same optical fiber is called wavelength division multiplexing (WDM). WDM is to combine two or more optical carrier signals of different wavelengths (carrying various information) at the sending end through a multiplexer, and couple them to the same optical fiber for transmission, while at the receiving end, the optical signals of various wavelengths are separated by a demultiplexer, and then further processed by the optical receiver to restore the original signal.



 2. How does WDM work?

 To put it simply, you can see the figure below. In the traditional transmission mode, one optical fiber can only transmit an optical carrier signal carrying one type of information. If different services are required, countless different and independent optical fibers are required for transmission. However, if there is a large amount of business information, a large number of optical fibers need to be laid for transmission, which poses a great challenge to wiring space and cost. The application of a WDM system can quickly solve the above problems. The WDM system can carry "service" signals in various formats, such as ATM, IP, etc., and multiple service signals can be transmitted through a single optical fiber through multiplexing and demultiplexing technologies, which greatly reduces the amount of optical fiber. It is an ideal means of expansion in network expansion and development. When introducing new broadband services, such as CATV, HDTV, B-ISDN, etc., only one additional wavelength needs to be added.




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



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