Why Are WDM Technologies So Popular Today

Nowadays the voice, video, and data networks are becoming more complex and requiring more bandwidth and faster transmission rates over ever increasing distances. To fulfill these demands, network managers are relying more about fiber optics. Nevertheless the reality that many providers, enterprise corporations, and government entities are facing is the fact that once their available fiber infrastructure is exhausted, laying more fiber is not really an inexpensive or feasible option. So, so what now?

Many groups are embracing Wave Division Multiplexing (WDM) technologies in order to increase capacity about the existing fiber infrastructure. WDM is a technology which multiplexes multiple optical signals onto a single fiber by utilizing different wavelengths, or colors, related to. By utilizing WDM communication methods network managers can realize a multiplication effect inside their available fiber's capacity.

WDM is protocol and bit-rate independent. WDM-based networks can transmit data in IP, ATM, SONET/SDH, and Ethernet, and look after bit rates between 100 Mbps and 40 Gbps. Therefore, WDM-based networks can hold various kinds of traffic at different speeds over an optical channel. It makes a less expensive approach to quick reaction to customers' bandwidth demands and protocol changes. To control bandwidth and expand capacity of existing fiber optic backbones, WDW-based networks by simultaneously combining and transmitting multiple signals at different wavelengths within the same fiber.

As segmentation and delivering business services tend to be more rampant, WDM optical solutions are becoming a valuable tool for cable operators. Using simple two-wavelength WDM can increase service capacity by twice within the same volume of fibers. For a long time, there've also been some limited solutions using more complicated WDM techniques that may carry four or even more optical signals on the same fiber. Recently cable equipment manufactures have released innovations using WDM that transport multiple broadcast optical signals on the single fiber, making node segmentation more cost-effective and operationally friendly.

WDM greatly enhances the capacity of systems. You will find mainly two variations of WDM which can be popular: Coarse WDM (CWDM) and Dense WDM (DWDM). Each signal is at a different wavelength and each variation has different capabilities, costs, and operational friendliness, used in different WDM Multiplexer (or Demultiplexer) devices. Multiplexer combines several data signals into one signal for transporting on the single fiber while Demulitplexers separate the signals conversely.

CWDM technologies have only been created for HFC networks within the return-path up to recently. Regarding return-path, approximately eight transmitters at different CWDM wavelengths can be multiplexed onto an individual fiber simply by using a CWDM MUX (CWDM Multiplexer). This could be useful when the return-path has a lot more bandwidth contention compared to the forward-path, so 2X4 node segmentation may be sufficient.

DWDM technologies offers much flexibility for node segmentation, yet it's more expensive and operationally challenging than CWDM. The method to segment nodes utilizing DWDM within the forward-path is known as Broadcast/Narrowcast DWDM Overlay. It utilizes two fibers within the downstream: one fiber having an optical signal with all the broadcast content, and something fiber with multiple optical signals on DWDM wavelengths, each containing unique narrowcast happy to obtain a segment. On the node, the narrowcast DWDM wavelengths are separated onto their unique fibers. The narrowcast content will then be overlaid with the broadcast content at the node in a choice of the RF domain or perhaps the optical domain.

As WDM technologies become very popular today, to discover suitable equipment that related to them comes to be so important to networking users. Fortunately, there are various kinds of CWDM/DWDM products available in FIBERSTORE, the biggest supplier of WDM equipments in China who can provide all fiber optic network solutions. Visit the website for additional information.

Advantages of CWDM technology and products

CWDM is a low-cost WDM transmission technology for metro access layer. Principle, CWDM is the use of the optical multiplexer to different wavelengths of light signals multiplexed to a single optical fiber for transmission, at the receiving end of the link, with the optical demultiplexer fiber mixed signal is decomposed into different wavelengths signal, connected to the respective receiving apparatus. The main difference with the DWDM is that: 0.2nm to 1.2nm wavelength interval with respect to the DWDM system is concerned, CWDM has a wider wavelength interval, the industry accepted standards wavelength intervals of 20 nm. CWDM wavelength interval width, the technical requirements of the laser. And there are two mainly CWDM products which are CWDM Mux and CWDM Demux modules.
Additionally, a large wavelength interval means that the optical multiplexer/demultiplexer structure is greatly simplified. For example, a CWDM system filter coating floors can be reduced to about 50 layers, and the the DWDM systems 100GHz filter coating floors of approximately 150 layers, which leads to increased yield, cost reduction, and the supplier of the filter is greatly increased pro-competitive. CWDM filter of cost than DWDM filter costs less than 50%, the moreover, with the automated production technology and the bulk of the increase will be further reduced.

There are some advantages of CWDM.

First, the low equipment cost is the most important advantage of CWDM. It has been introduced in the front of the specific circumstances.

Second, it can reduce the operational costs of the network. You can use 220V AC power for the CWDM equipments because it is with small size, low power consumption, and easy to maintain and power supply. Because of its fewer number of wavelengths, the board backup volume is lower. There are no special requirements on the fiber using 8 wave CWDM devices, and G.652, G.653, G.655 fiber can be used, you can also take advantage of existing fiber optic cable. CWDM systems can significantly increase the transmission capacity of optical fiber and the optical fiber resources utilization. The MAN construction are facing certain degree of tension or expensive price to lease fiber fiber resources. Now the typical CWDM system can provide eight optical channels, and up to 18 optical channels in accordance with ITU-T G.694.2.

Third, the small size and low power consumption. CWDM lasers do not need thermoelectric cooler and temperature control function, so it is possible to significantly reduce the power consumption.

Fourth, good flexibility and scalability. For metro business terms, the business flexibility, particularly the speed of business provided and the ability to be expanded as the business development is very important. With CWDM technology users can opene a business in one day or a few hours, and with the increased volume of business, we can capacity expansion by inserting a new OTU board to improve the quality of business. CWDM system make it possible to recove the optical layer in MAN. Optical layer recovery is much more economical than electric layer recovery. Considering that the optical layer recovery is independent of the business and the rate, the original own institutional system of protection features (such as Gigabit Ethernet) can take advantage of CWDM to be protected.

Due to the above advantages of CWDM technology, CWDM get more and more applications in the field of telecommunications, broadcasting, enterprise network, campus network. The constraints of the CWDM product development critical factor is the price of optical transceiver modules and reuse demultiplexing. With the development of the market and the progress of the manufacturing process, further reduce the cost of equipment is an important direction of development. Also, the interface supports a variety of business development direction of CWDM. Now there are cheap CWDM Mux Demux on sale in FiberStore, which is the best Chinese fiber optic products supplier.