The multiplexing technology mainly solves the problem of small transmission capacity of single optical fiber, especially the current HD-SDI application, which occupies a large amount of bandwidth and has a large amount of traffic. However, the current multiplexing technology still cannot meet this requirement well. R&D is particularly important.
The multiplexing technologies mainly include four technologies: Frequency Division Multiplexing (FDM), Time Division Multiplexing (TDM), Wavelength Division Multiplexing (WDM), and Code Division Multiplexing (CDMA). According to Liu Xueming, the Chengdu Digital Micro Digital System, wavelength division multiplexing is a relatively mature technology. On a single-core fiber, 16-channel HD-SDI signals can be transmitted. It has a certain capacity. Currently, there are many programs that use this technology. However, the cost of the technology solution is generally high. If the electric multiplexing technology (general term for FDM, TDM, and WDM) is integrated with the wavelength division multiplexing technology, several times the capacity can be improved.
Reuse Technology Profile:
Frequency Division Multiplexing (FDM): The total bandwidth used for the transmission channel is divided into several sub-bands (or sub-channels), each of which transmits one signal. Frequency division multiplexing requires that the total frequency width be greater than the sum of the frequency of each sub-channel, and in order to ensure that the signals transmitted in each sub-channel do not interfere with each other, an isolation band should be set up between the sub-channels. This ensures that each signal is mutually independent. Do not interfere (one of the conditions).
Time division multiplexing (TDM): Divides the time for transmitting information to the entire channel into several time slices (referred to as time slots) and allocates these time slots to each signal source. Each signal is monopolized in its own time slot. Channel for data transmission.
Wavelength division multiplexing (WDM): The entire wavelength band is divided into several wavelength ranges, each user occupies one wavelength range for transmission, which is essentially frequency division multiplexing.
Due to the economical efficiency of WDM system technology, it has become the main means for the expansion of optical fiber communication networks.
Code Division Multiplexing (CDM): It is a multiplexing method that differentiates the original signals of each channel by different codes. It mainly combines with various multiple access technologies to generate various access technologies, including wireless and wired access.
The multiplexing technologies mainly include four technologies: Frequency Division Multiplexing (FDM), Time Division Multiplexing (TDM), Wavelength Division Multiplexing (WDM), and Code Division Multiplexing (CDMA). According to Liu Xueming, the Chengdu Digital Micro Digital System, wavelength division multiplexing is a relatively mature technology. On a single-core fiber, 16-channel HD-SDI signals can be transmitted. It has a certain capacity. Currently, there are many programs that use this technology. However, the cost of the technology solution is generally high. If the electric multiplexing technology (general term for FDM, TDM, and WDM) is integrated with the wavelength division multiplexing technology, several times the capacity can be improved.
Reuse Technology Profile:
Frequency Division Multiplexing (FDM): The total bandwidth used for the transmission channel is divided into several sub-bands (or sub-channels), each of which transmits one signal. Frequency division multiplexing requires that the total frequency width be greater than the sum of the frequency of each sub-channel, and in order to ensure that the signals transmitted in each sub-channel do not interfere with each other, an isolation band should be set up between the sub-channels. This ensures that each signal is mutually independent. Do not interfere (one of the conditions).
Time division multiplexing (TDM): Divides the time for transmitting information to the entire channel into several time slices (referred to as time slots) and allocates these time slots to each signal source. Each signal is monopolized in its own time slot. Channel for data transmission.
Wavelength division multiplexing (WDM): The entire wavelength band is divided into several wavelength ranges, each user occupies one wavelength range for transmission, which is essentially frequency division multiplexing.
Due to the economical efficiency of WDM system technology, it has become the main means for the expansion of optical fiber communication networks.
Code Division Multiplexing (CDM): It is a multiplexing method that differentiates the original signals of each channel by different codes. It mainly combines with various multiple access technologies to generate various access technologies, including wireless and wired access.
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