What is meant by wave division multiplexing?
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 purpose of WDM?
Wavelength division multiplexing, WDM, has long been the technology of choice for transporting large amounts of data between sites. It increases bandwidth by allowing different data streams to be sent simultaneously over a single optical fiber network.
Where is WDM located?
WDM wavelengths are positioned in a grid having exactly 100 GHz (about 0.8 nm) spacing in optical frequency, with a reference frequency fixed at 193.10 THz (1,552.52 nm). The main grid is placed inside the optical fiber amplifier bandwidth, but can be extended to wider bandwidths.
What is WDM channel?
A WDM channel is therefore assigned to a specific frequency or wavelength within the optical frequency or wavelength domain that is sent through the optical fiber. Different WDM channels are separated by a defined difference in frequency or wavelength, which is the channel spacing.
What type of signals do a WDM use?
The WDM system can carry multiple signals, such as ATM, IP, etc., through multiplexing and demultiplexing technology, the multiple service signals can be transmitted through a single optical fiber, which greatly reduces the amount of optical fiber. This is an ideal technology for capacity expansion.
Is TDM analog or digital?
TDM works with digital signals as well as analog signals. While FDM works with only analog signals.
What is a wavelength division multiplexing system?
The first WDM systems were two-channel systems that used 1310nm and 1550nm wavelengths. Shortly afterwards came multi-channel systems that used the 1550nm region – where the fiber attenuation is lowest. Wavelength division multiplexing systems can combine signals with multiplexing and split them apart with a demultiplexer.
What is the difference between WDM and frequency-division multiplexing?
The term WDM is commonly applied to an optical carrier, which is typically described by its wavelength, whereas frequency-division multiplexing typically applies to a radio carrier which is more often described by frequency.
How is time and wavelength division multiplexing used in NG-PON2?
To meet the general requirement of 40-Gb/s downstream capacity, an underlying hybrid time and wavelength division multiplexing scheme is adopted in NG-PON2, giving rise to the time and wavelength division multiplexing PON (TWDM-PON). Fig. 8 depicts a typical schematic diagram of a TWDM-PON system ( Luo et al., 2013 ).
What is multiplexing in RF spectrum?
Each IR channel carries several RF signals combined with frequency-division multiplexing (FDM) or time-division multiplexing (TDM). Each multiplexed infrared channel is separated or demultiplexed into the original signals at final point.