SINTAI OTNS8600 system consists of 1U C/DWDM Optical Transport System, 2U C/DWDM Optical Transport System, 5U C/DWDM Optical Transport System. We are a reliable supplier and your close partner of WDM products.
The combination of this system provides a highly powerful platform enabling any type of optical networking application. Today,it is not difficult for you to find WDM in optical communication, data communication and in other optical fiber cases.
Multiplexing optical signals of different wavelengths into the same optical fiber for transmission, we call the method or technology wavelength division multiplexing (WDM).
Wavelength division multiplexing (WDM) is a technology that combines two or more optical carrier signals of different wavelengths at the transmitting end through a multiplexer, namely a type of wdm equipment, and coupling them to the same optical fiber for transmission; at the receiving end, the optical carriers of various wavelengths are separated by the demultiplexer, and then further processed by the optical receiver to restore the original signal. This technology of simultaneously transmitting two or more optical signals of different wavelengths in the same optical fiber is called wavelength division multiplexing.
Classification of wavelength division multiplexing (WDM) system
Opening system: Generally, WDM systems have (Optical Transponder Unit) OTU to convert optical signals of non-standard wavelengths of client equipment into optical signals with standard wavelengths that comply with ITU-T G.694.1 or ITU-T G.694.2 recommendations.
Integrated system: Another WDM system does not require OTU. The optical port of the client-side equipment (such as a switch) can be equipped with a standard wavelength division optical module, and the luminous signal of the client-side equipment is directly connected to the multiplexing and demultiplexing unit (MDU) of the WDM system.
Coarse Wavelength Division Multiplexer (CWDM) is a low-cost WDM transmission technology for the access layer of the metropolitan area network. Dense Wavelength Division Multiplexing (DWDM) is to combine a group of optical wavelengths and use a single optical fiber for transmission. However, DWDM laser technology is more expensive than CWDM, as it requires more stable wavelength sources. The increasing cost of the DWDM transmitter is mainly due to the high cost of the laser diodes, and the feedback cooling operation to maintain the wavelength stability. And that's the reason why the price of WDM devices vary.
Wide wavelength intervals (20nm)
Dense wavelength intervals (0.4nm or 0.8nm)
Small number of channels (16 channels)
Large number of channels (96 channels )
Technical requirement is low
Technical requirement is high
Mainly used on trunk lines, in local networks and metropolitan area networks
Mainly used in the access network of the metropolitan area network.
Transmission rate is high and the system capacity is large
Transmission rate is relatively low, and the system capacity is not large
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As long as the number of multiplexing optical channels and devices is increased, the transmission capacity of the system can be increased to achieve expansion, and the expansion will not have adverse effects on other multiplexing optical paths. Therefore, the upgrade and expansion of the WDM system are smooth, convenient, and easy, so as to maximize the protection of the initial construction investment.
The multiplexing channels of the WDM system are independent of each other, so each channel can transparently transmit different service signals, such as voice, data, and image, which will not interfere with each other. It can bring great convenience to users.
The transmission capacity of the WDM system is very large. Because the multiplexing optical channel rate of WDM system can be 10, 25, 100, 200 Gbit/s, and the number of multiplexing optical channels can be 4, 8, 16, 32, or even more, the transmission capacity of the system can reach as much as 19.2 Gbit/s.
Dense Wavelength Division Multiplexing (DWDM) is an optical multiplexing technology used to increase bandwidth over existing fiber networks. DWDM works by combining and transmitting multiple signals simultaneously at different wavelengths on the same fiber.
CWDM has a wider channel spacing than DWDM. CWDM systems can carry 18 channels. DWDM systems, on the other hand, can carry 40, 80, 96 wavelengths by utilizing a much narrower spacing of 0.8/0.4 nm (100 GHz/50 GHz grid).
DWDM (dense wavelength division multiplexing) is the technology for projecting multiple lambda circuits on fiber strands. Currently, 96 lambdas per fiber are common.
WDM transport system includes CWDM and DWDM, which can achieve large-capacity transmission in a single fiber.