WDM Mux/Demux Transmission Modes Overview

WDM (wavelength division multiplexing) is one of the technology which can expand the capacity of a fiber optic network without requiring additional fiber, and it plays a very important role in long-haul data transmissions. In a WDM system, there is an important component called WDM Mux Demux (multiplexer/demultiplexer), which can multiplex multiple wavelengths into one single fiber to increase the network capacity. Usually there are three transmission modes in WDM networks: duplex bi-directional transmission, simplex bi-directional transmission and simplex uni-directional transmission. And this post will illustrate some detailed information about three transmission modes of WDM Mux/Demux.
Duplex Bi-directional Transmission Mode
In this transmission mode, one fiber only transmits one direction optical signal and the reverse optical signal will be sent by another fiber, which is often seen in dual fiber WDM Mux/Demux. And the same wavelengths can be used in two directions. Take the 4CH dual fiber DWDM Mux/Demux for example, the transmit side and receive side of the WDM Mux/Demux are using the same wavelength C21, C22, C23 and C24. And this transmission mode can make full use of the huge bandwidth resources of the optical fiber, and the transmission capacity of one optical fiber is expanded. In the long-distance network, the number of wavelengths can be gradually increased according to the actual traffic volume, which is very flexible.
Simplex Bi-directional Transmission Mode
In this transmission mode, the simultaneous transmission of optical signals in two reverse directions will be realized in one fiber, which can greatly save fiber resources compared with duplex bi-directional transmission mode. This transmission mode is used in transmission between two dual fiber WDM Mux/Demux. The simplex bi-directional link has different wavelengths on the same channel, so single fiber Mux/Demux is always used in pairs. Take the 4CH single fiber DWDM Mux/Demux for example, the transmit wavelength of the client port at side-A (the left side) must match the receive wavelength of the same client port at side-B (the right side). As for the wavelength of the transceiver, it is mainly based on the transmit wavelength of the client port.
Simplex Uni-directional Transmission Mode
Simplex uni-directional transmission means that an optical fiber only transmits optical signals in one direction, and there is no reverse optical signal. The Mux multiplexes the wavelengths at one side, and the Demux demultiplexes the wavelengths at the other side, just like the following picture shown. we can see that wavelengths of the DWDM Mux Demux at the left and right ends are the same. This transmission mode is less popular in the current market because duplex bi-directional and simplex bi-directional transmission modes have the same function of this transmission mode.
FAQs About Three Transmission Modes
1. Does single fiber Mux support simplex uni-directional transmission?
Compared with Mux and Demux in uni-directional transmission (they just multiplex or demultiplex the wavelengths), the single fiber WDM Mux/Demux in the current market can multiplex and demultiplex the wavelengths, which can realize uni-directional transmission.
2. How many channels at maximum will be made for CWDM Mux/Demux and DWDM Mux/Demux respectively in different transmission modes?
In FS, in terms of CWDM Mux/Demux
·Duplex bi-directional: up to 18 channels
·Simplex bi-directional: up to 9 channels
·Simplex uni-directional: up to 18 channels
In FS, in terms of DWDM Mux/Demux
·Duplex bi-directional: up to 40 channels
·Simplex bi-directional: up to 20 channels
Conclusion
In summary, you are more likely to have a general idea about three transmission modes of WDM Mux/Demux. WDM Mux/Demux in FS can expand existing fiber capacity and let operators make full of use of available fiber bandwidth, which will be a cost-effective, flexible solution for operators.

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