What is Dense Wavelength Division Multiplexing (DWDM)?

What does DWDM stand for?

Dense Wavelength Division Multiplexing (DWDM) is Wavelength division Multiplexing (WDM) with regular channel spacing of a hundred GHz for 40 channels and 50 GHz for eighty channels. Each channel consists of a TDM (time division multiplex) sign. And every of up to 80 channels can bring 2.5 Gbps for a total of two hundred billion bits consistent with 2d via the Optical Fiber. These indicators use the 3rd transmission Window, called the C-Band, meaning the light beam wavelengths are among 1530nm to 1565nm. (nm = a Nanometers or a billionth of a meter)

What Does Dense Wavelength Division Multiplexing Mean?

A simple Dense Wavelength Division Multiplexing consists of five fundamental additives:

• DWDM Terminal Multiplexer: This Device consists of a one wavelength converting Transponder for every wavelength carried. It gets an input optical Signal, converts it to an electrical sign and then retransmits it as an optical sign (a sySTEM abbreviated as O/E/O) the usage of a 1550 nm laser beam. The MUX (multiplexer) takes some of 1550 nm optical indicators and places them on a unmarried optical fiber. This terminal multiplexer may contain an EDFA (Erbium Doped Fiber Amplifier) to Make bigger the optical sign.
• InterMediate Line Repeater: These are amplifiers placed each eighty to a hundred kilometers to compensate for lack of optical strength; amplification is carried out via an EDFA, generally together with numerous amplifier degrees.
• Intermediate Optical Terminal, or Optical Add/Drop Multiplexer: This is a faraway Web Page amplifier placed wherein the sign can also have traveled as much as a hundred and forty kilometers; diagnostics and Telemetry indicators are extracted or Inserted.
• DWDM Terminal Demultiplexer: This tool breaks the multi-wave signal lower back into Character indicators; these can be desPatched to O/E/O Output transponders before being Relayed to their intended locations, i.E. Client-Layer structures.
• Optical Supervisory Channel (OSC): This channel contains inFormation about the multi-wave optical sign and might offer statistics approximately situations at the site of the intermediate line repeater (Component 2 above).

DWDM is every so often known as wave division multiplexing (WDM) and WDM is growing denser because the technology evolves. Thus, the two phrases are frequently used synonymously.

Even newer generation, referred to as Raman Amplification, is the usage of light within the L-Band (1565 nm to 1625 nm), about doubling the maximum capacities above; accordingly, with 25 GHz spacing, now and again known as extremely dense wavelength division multiplexing, the device lets in as much as a hundred and sixty channel operation.