In fact, wavelengths other than 1270~1610 can be used in WDM systems, such as 1630, 1650, and 1250nm can be used in WDM systems, but the International Telecommunication Union only regulates the following coarse WDM wavelengths: 1270, 1290, 1310, 1330, 1350, 1370, 1390, 1410, 1430, 1450, 1470, 1490, 1510, 1530, 1550, 1570, 1590, 1610nm. The parameter insertion loss of a wavelength division multiplexer is an important index to measure the performance of a passive optical device, which represents the influence of the device on the optical power of each channel. Of course, it is also possible that the transmission characteristics of wavelengths other than 1270~1610 are not as good as wavelengths within 1270~1610. Cost-effective wavelength division multiplexer
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The development direction of CWDM
One of the key factors restricting the development of CWDM products is the price of optical transceiver modules and multiplexing and demultiplexing devices. With the development of the market and the progress of the manufacturing process, it is an important development direction to further reduce the cost of equipment. Another development direction is that it can be combined with MSTP or high-performance routing and switching equipment as a means for MSTP equipment or high-speed routers to expand line-side capacity. Develop E-band optical device technology to make it mature as soon as possible. Develop 10G rate optical channel technology to improve the capacity and upgradeability of the CWDM system. Supporting various business interfaces is the direction of CWDM development. The demand for multi-service interfaces at the access layer of the MAN is the driving force for manufacturers to further develop multi-service interfaces. CWDM equipment will provide various service interfaces such as FE, GE, SDH, ESCON, and FC. Another development direction is that it can be combined with MSTP or high-performance routing and switching equipment as a means for MSTP equipment or high-speed routers to expand line-side capacity. It is also a development direction to provide multi-level optical layer and service layer protection functions to meet the needs of different customers. The network management technology and equipment security and reliability are further improved to enhance the competitiveness in the market.
For the launched optical fiber, since the price of the optical cable is twice the price, and the E-band CWDM optical transceiver module technology is not yet mature, it is unlikely to apply full-band CWDM equipment in the short term (1-2 years), and the use of optical cable exists. The problem of large investment and no benefit in the short term, so the application of optical fiber in the optical cable network of metropolitan users is subject to certain restrictions. OXC will play a role in the scheduling of the all-optical network, the concentration and diversion of services, and the protection and recovery of the all-optical network.
Technical principle of wavelength division multiplexing (4)
WDM is essentially a frequency division multiplexing FDM technology on optical frequency, and each wavelength channel is realized by dividing in the frequency domain. What are the advantages of CWDM wavelength division multiplexer system CWDM is a low-cost WDM transmission technology for the access layer of the metropolitan area network. Each wavelength channel occupies the bandwidth of a section of optical fiber. The difference from the past coaxial cable FDM technology is: (1) The transmission medium is different. The WDM system is the frequency division of the optical signal, and the coaxial system is the frequency division of the electrical signal. (2) On each channel, the coaxial cable system transmits the analog signal 4KHz voice signal, while the WDM system currently uses digital signals or higher-speed digital systems on each wavelength channel. Cost-effective wavelength division multiplexer