Increasing Bandwidth with Dense Wave Division Multiplexing DWDM

Using Dense Wavelength Division Multiplexing to Increase Bandwidth DWDM bandwidth is a function of transmitting digital information. Over the past few years, bandwidth has grown to nearly twice the computing capacity. Data traffic doubles every 100 days (according to US Department of Commerce data), Internet traffic is expected to reach 16 million terabytes by 2003. Optical fiber is the preferred transmission medium. Copper, coaxial, high frequency radio is implemented from the viewpoint of data transmission function.

The Dense Wavelength Division Multiplexing (DWDM) technology is an ideal solution to solve the problem of capacity shortage and can be easily classified into passive DWDM and active DWDM. To greatly expand the bandwidth of existing fiber systems, passive DWDM systems and active DWDM systems are designed to multiplex multiple wavelengths and transmit multiple signals on a single fiber. In order to better understand the function of these two DWDM systems, we understand what passive DWDM and active DWDM systems are and find their strengths and weaknesses.

As well known, WDM (wavelength division multiplexing) is divided into DWDM (fine wavelength division multiplexing) and CWDM (coarse wavelength division multiplexing). In both types, DWDM (Dense Wavelength Division Multiplexing) is no doubt the first choice for fiber applications. However, due to the high price, manufacturers who are short of funds hesitate to purchase. Currently, I think most of them are willing to choose lower cost CWDM. The difference between DWDM and CWDM is far beyond this. Today, this article introduces CWDM and DWDM.

High Density Wavelength Division Multiplexing (DWDM) is designed for long distance transmission where the wavelength is dense in order to increase the bandwidth of the existing fiber network. Compared to CWDM, DWDM uses over 18 wavelength channels to achieve wider channel spacing. DWDM works by transmitting multiple signals simultaneously at different wavelengths on the same fiber. But intensive channels are still limited. First, a high precision filter is needed to remove specific wavelengths without disturbing adjacent wavelengths. They are not cheap. Second, precision lasers must accurately maintain the channel on the target. This almost means that this laser must function at a certain temperature. Like associated cooling systems, high precision, high stability lasers are also expensive. This technology creates multiple virtual fibers and doubles the capacity of physical media. Therefore, it is more expensive than CWDM