Brief CWDM basic principles and wide application

CWDM is a low-cost WDM transmission technology for the access layer of the metropolitan area network. In principle, CWDM uses optical multiplexers to multiplex different wavelengths optical signals into a single fiber for transmission. At the receiving end optical demultiplexers decompose the mixed signal into different wavelengths to the corresponding receiving device.

What it can do and where it can be applied?
1. Network expansion and upgrade: CWDM can convert any input optical wavelength to a fixed ITU-CWDM output optical wavelength, and transmit up to a dozen optical signals simultaneously in one fiber, Which expands the transmission capacity and fiber utilization rate. Save the time and cost of laying optical cables without affect the original business when opening new services.
2. Mixed transmission of various types of signals: suitable for SDH, ATM, Ethernet, Fibre Channel equipment upgrade and transformation within 10Mb/s ~ 2.5 Gb/s rate, long-distance line relay, analog signal transmission, and digital and analog signals Hybrid transmission in one fiber.
3. Mode conversion: It can complete the conversion of single-mode light waves into arbitrary single-mode and multi-mode light waves, which is suitable for various complex network situations.
4. Wavelength conversion: complete the conversion of any wavelength of single-mode and multi-mode light waves to CWDM wavelength, or convert one CWDM wavelength to another arbitrary wavelength, and the transmission distance can reach hundreds of kilometers.
5. Optical relay: multiple CWDM can be connected in series to increase the transmission distance (up to hundreds of kilometers).
6. Security networking: Using it can form multiple virtual optical networks (OPN) isolated from each other on a physical channel in a single pair of optical fibers, so that the network is completely protected from all software viruses and hackers, and its security is much higher than that of general VPN, especially suitable for government, public security, banking and other fields.