What is wide wavelength division multiplexing?
Wavelength Division Multiplexing (WDM) is a fiber-optic transmission technique that enables the use of multiple light wavelengths (or colors) to send data over the same medium. Early fiber-optic transmission systems put information onto strands of glass through simple pulses of light.
What is WDM in optical communication?
Wavelength Division Multiplexing, WDM, is a technology that increases bandwidth by allowing different data streams at different frequencies to be sent over a single optical fiber network. Signals at WDM wavelengths are independent from each other.
What is the need of WDM in optical communication?
Wavelength division multiplexing (WDM) is a technique of multiplexing multiple optical carrier signals through a single optical fiber channel by varying the wavelengths of laser lights. WDM allows communication in both the directions in the fiber cable.
What are the two different types of WDM?
There are two main types of technology for wavelength division multiplexing (WDM): coarse (CWDM) and dense (DWDM). They both use multiple wavelengths of light on a single fiber, but differ in their spacing of the wavelengths, number of channels and ability to amplify the multiplexed signals.
What is optical multiplexing?
Optical multiplexing is the art of combining multiple optical signals into one to make full use of the immense bandwidth potential of an optical channel. It can perform additional roles like providing redundancy, supporting advanced topologies, reducing hardware and cost, etc.
What is the use of EDFA?
Invented in 1987 [1], EDFA is now most commonly used to compensate the loss of an optical fiber in long-distance optical communication. Another important characteristic is that EDFA can amplify multiple optical signals simultaneously, and thus can be easily combined with WDM technology.
What is wavelength fiber?
Common Fiber Optic Wavelengths Wavelengths typically range from 800 nm to 1600 nm, but by far the most common wavelengths actually used in fiber optics are 850 nm, 1300 nm, and 1550 nm. Multimode fiber is designed to operate at 850 nm and 1300 nm, while single-mode fiber is optimized for 1310 nm and 1550 nm.
What is the advantage of wavelength division multiplexing?
The advantage of WDM is to exploit the full capacity of the fiber-optic cable by allowing multiple beams of light at different frequencies to be transmitted on the same fiber-optic cable. A prime application of WDM is the SONET (Synchronous Optical Network) standard developed in North America.
What is difference between WDM and DWDM?
The main comparison between WDM and DWDM is one of degree only. DWDM has a greater overall capacity so DWDM spaces the wavelength more closely than WDM. In WDM channel spacing reduces to 1.6 nm or less while in DWDM channel spacing is small 200 GHz and small. …
What is wavelength in networking?
Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire. The higher the frequency of the signal, the shorter the wavelength.
What wavelength do Edfas operate?
Two typical wavelengths to pump an EDFA are 980 or 1480 nm. When an EDFA is pumped at 1480 nm, Er ion doped in the fiber absorbs the pump light and is excited to an excited state (Excited state 1 in Figure 3).
Why the operating wavelength a λ 1.3 μm and b 1.55 μm are widely used for long distance optical fiber communication networks?
At around 1.3 – 1.5 micron, both Rayleigh scattering and IR absorption (shadow overtones) makes a valley region (minimum absorption), which is idea for long distance data transmission using silica fibers. Since optical communication reflects silica, this is much more established as the low loss window.
How does wavelength division multiplexing ( WDM ) work?
Computer Engineering Computer Network MCA Wavelength division multiplexing (WDM) is a technique of multiplexing multiple optical carrier signals through a single optical fiber channel by varying the wavelengths of laser lights. WDM allows communication in both the directions in the fiber cable.
What is the channel spacing for optical multiplexing?
The channel spacing between wavelengths determines the type of multiplexing. The narrower the channel spacing, the more signals that can be combined in a single fiber. A channel spacing of 20nm is known as Course Wavelength Division Multiplexing (CWDM).
What is the purpose of wavelength division duplexing?
This technique enables bidirectional communications over a single strand of fiber, also called wavelength-division duplexing, as well as multiplication of capacity.
How are optical signals combined in a WDM system?
Concept and Process In WDM, the optical signals from different sources or (transponders) are combined by a multiplexer, which is essentially an optical combiner. They are combined so that their wavelengths are different. The combined signal is transmitted via a single optical fiber strand.