Dense Wavelength Division Multiplexing
Publish:Box Optronics  Time:2022-07-04  Views:58
DWDM can combine and transmit different wavelengths at the same time in the same optical fiber. In order to be effective, one fiber is converted to multiple virtual fibers. Therefore, if you plan to multiplex 8 optical fiber carriers (OC), that is, transmit 8 signals in one optical fiber, the transmission capacity will increase from 2.5Gb/s to 20Gb/s. Data was collected in March 2013. Due to the use of DWDM technology, a single optical fiber can transmit more than 150 light waves of different wavelengths at the same time, and the maximum speed of each light wave can reach a transmission rate of 10Gb/s. As manufacturers add more channels to each fiber, the transmission speed of terabits per second is just around the corner.
A key advantage of DWDM is that its protocol and transmission speed are irrelevant. The DWDM-based network can use IP, ATM, SONET/SDH, and Ethernet protocols to transmit data, and the processed data flow is between 100Mb/s and 2.5Gb/s. In this way, DWDM-based networks can transmit different types of data traffic at different speeds on a laser channel. From the point of view of QoS (Quality of Service), DWDM-based networks quickly respond to customer bandwidth requirements and protocol changes in a low-cost manner.

The integrated DWDM system has many advantages:
1. The multiplexer and demultiplexer of the integrated DWDM system are used separately at the transmitting end and the receiving end, namely: there is only a multiplexer at the transmitting end, and only a splitter at the receiving end, and both the receiving end and the transmitting end are removed. OTU conversion equipment (this part is more expensive)? Therefore, the investment of DWDM system equipment can be saved by more than 60%.
2. The integrated DWDM system uses only passive components (such as multiplexers or demultiplexers) at the receiving and transmitting ends. Telecom operators can place orders directly from device manufacturers, reducing supply links and lower costs, thereby saving equipment costs .
3. The open DWDM network management system is responsible for: OTM (mainly OTU), OADM, OXC, EDFA monitoring, and its equipment investment accounts for about 20% of the total investment of the DWDM system; and the integrated DWDM system does not require OTM equipment. The network management is only responsible for the monitoring of OADM, OXC, and EDFA, and more manufacturers can be introduced to compete, and the network management cost can be reduced by about half compared with the open DWDM network management.
4. Since the multiplexing/demultiplexing equipment of the integrated DWDM system is a passive device, it is convenient to provide multiple services and multi-rate interfaces, as long as the wavelength of the optical transceiver of the business end equipment meets G. 692 standard, which can access any service such as PDH, SDH, POS (IP), ATM, etc., and supports PDH, SDH of various rates such as 8M, 10M, 34M, 100M, 155M, 622M, 1G, 2.5G, 10G, etc. , ATM and IP Ethernet? Avoid the open DWDM system due to OTU, but can only use the purchased DWDM system has determined the optical wavelength (1310nm, 1550nm) and transmission rate SDH, ATM or IP Ethernet equipment? It is impossible to use other interfaces at all.
5. If the laser device modules of optical transmission equipment such as SDH and IP routers are uniformly designed with standard geometric size pins, standardized interfaces, easy maintenance and insertion, and reliable connection. In this way, maintenance personnel can freely replace the laser head with a specific color wavelength according to the wavelength needs of the integrated DWDM system, which provides convenient conditions for the failure maintenance of the laser head, and avoids the drawback of having to replace the entire board by the manufacturer in the past. High maintenance costs.
6. The color wavelength light source is currently only slightly more expensive than the ordinary 1310nm, 1550nm wavelength light source. For example, the 2.5G rate color wavelength light source is currently more than 3,000 yuan more expensive, but when it is connected to the integrated DWDM system, it can be used The cost of the system is reduced by nearly 10 times, and with the large number of applications of color wavelength light sources, its price will be close to that of ordinary light sources.
7. The integrated DWDM equipment is simple in structure and smaller in size, only about one-fifth of the space occupied by the open DWDM, saving computer room resources.
In summary, the integrated DWDM system should be widely used in a large number of DWDM transmission systems, and gradually replace the dominant position of the open DWDM system. Considering that a large number of optical transmission equipment with common light sources are currently in use on the network, it is recommended to adopt an integrated and open compatible hybrid DWDM to protect the initial investment.
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