There is a great role of optical fiber transmission in increasing the capacity of telecommunication. The low loss transmission capacity of the optical fibers has made high bit rate transmission over long distances possible. With the increase in demand for network capacity, the current optical backbones are fast provoking inadequate. In most cases, it is relatively very expensive to lay a new fiber in order to increase the network capacity.
WDM or Wavelength division multiplexing is a transmission technology which allows the capacity of existing optical links to be increased without the need of installing any new fiber and hence saving significant cost. In WDM, many signals at different carrier wavelengths are transmitted over a single fiber. Today, in the countries like Europe, Asia and US, point to point WDM links are deployed rapidly.
WDM is the transmission of several optical signals simultaneously at different carrier wavelengths on a single fiber and the separation of the signals by wavelength at the receiving end. It is also referred to as a technique where two wavelengths one in the 1.3-micrometer optical window and the other in the 1.55-micrometer window have been multiplexed on the same link, hence doubling the link capacity.
There are many economic benefits of WDM technology. By using WDM, you can increase the capacity of existing networks without expensive re-cabling and reduce the cost of the network capacity upgrades. WDM systems can combine signals with a multiplexer and split them apart with the use of de-multiplexer.
WDM systems are incredible with the telecommunication companies because they let them expand the capacity of the network without laying any more fiber by using WDM and optical amplifiers. Generally, WDM systems use single mode optical fiber in which only one ray of light having a core diameter of 9 micrometers.
Here are the uses of wavelength division multiplexing-
• WDM increases the effective bandwidth of optical fiber communication systems by multifold
• Optical fiber repeaters, called sigma amplifiers, make WDM cost-effective, a long-term solution.
• This reduces costs and increases the cable’s ability to transmit data.
• Wavelength Division Multiplexing (WDM) uses multiple wavelengths (color of light) to transmit signals over a single fiber.
• It uses different colors of light to create multiple signal paths.
• It uses an optical prism to separate different colors at the receiving end, and the optical prism does not require a power supply.
• These systems use temperature stabilized lasers to provide the required number of channels.
Transceivers are wavelength-specific lasers that convert data signals from SANs and IP switches into optical signals that can be transmitted to optical fibers. Each data stream is converted into a signal with a light wavelength of a unique color. Due to the physical characteristics of light, the channels cannot interfere with each other. All WDM wavelengths are independent. Creating a virtual fiber channel in this way means that the number of required fibers is reduced by the factor of the wavelength used. It also allows new channels to be connected as needed without disrupting existing traffic services.
Here is all you need to know about the WDM systems!