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Dense Wavelength Division Multiplexing (DWDM) is the ability to combine a set of optical wavelengths for transmission over a single fibre. DWDM technology is an extension of optical networks and the main advantage of DWDM is that it is protocol and transmission rate independent, allowing DWDM-based networks to transmit data over IP, ATM, SONET, SDH and Ethernet. DWDM systems typically have the following optical components: DWDM optical modules, DWDM MUX/DEMUX , DWDM OADM and optical amplifiers. Today we talked about DWDM MUX/DEMUX A DWDM multiplexer (Mux) combines the output optical signals from multiple transmitters for transmission over a single fibre. At the receiving end, another DWDM demultiplexer (Demux) separates the combined optical signals. only one fibre is used between  DWDM multiplexers  (in each transmission direction). instead of using a single fibre in each pair of optical modules, DWDM allows multiple optical channels to occupy a single optical cable. HTF specialize in

The 5G era has arrived. If the traditional optical fiber direct connection solution is adopted, the 5G fronthaul network will require a large amount of optical fibers, which not only requires high deployment costs, but also complicates post-operation and maintenance. Therefore, in the 5G era, it is necessary to explore innovative fronthaul bearer solutions. The fronthaul solutions in the 5G era mainly include: optical fiber direct connection, passive WDM, semi-active WDM and active WDM. Today we will introduce the application of passive WDM in 5G fronthaul.   The passive wavelength division multiplexer (WDM) is designed to solve the fiber resources for long-distance transmission between the distributed unit (DU) and the active antenna unit (AAU) in the centralized radio access network (C-RAN) 5G fronthaul architecture Insufficient problem, in addition, passive WDM can also save fiber resources. In passive WDM, colored optical modules are directly deployed on AAUs and DUs, and multiple

Wavelength Division Multiplexing (WDM) is a technology that transmits multiple wavelengths of optical signals simultaneously in a single fiber. Compared with single-wavelength technology, WDM can save more fiber resources. The basic principle of WDM is to use a wavelength division   multiplexer   (combiner) at the transmitter side to combine different wavelengths of information optical carriers together into one fiber for transmission, and at the receiver side, another wavelength division multiplexer (splitter) to separate different optical carriers. WDM systems all work in the 1550nm window. Quartz fiber has three bands available in the 1550 wavelength region, namely S-band, C-band and L-band. The S-band wavelength range is from 1460 to 1530nm, the C-band wavelength range is from 1530 to 1565nm, and the L-band wavelength range is from 1570 to 1605nm. Wavelength division multiplexing (WDM) with 1310nm/1550nm window is used for access networks, but rarely for long-distance transmission.