DWDM – Dense Wavelength Division Multiplexing
Dense wavelength division multiplexing (DWDM) is a technology that puts data from different sources together on an optical fiber, with each signal carried at the same time on its own separate light wavelength. Using DWDM, up to 80 separate wavelengths or channels of data can be multiplexed into a light stream transmitted on a single optical fiber.
Our CTS Cabling and fiber optics installation experts reveal the basic DWDM system and its main components:
- Terminal multiplexer. The terminal multiplexer contains one wavelength converting transponder for each wavelength signal it will carry. The wavelength converting transponders receive the input optical signal, convert that signal into the electrical domain, and retransmit the signal using a 1550 nm band laser.
- Intermediate line repeater. This is placed approximately every 80 – 100 km for compensating the loss in optical power, while the signal travels along the fiber.
- Intermediate optical terminal or optical add-drop multiplexer. This is a remote amplification site that amplifies the multi-wavelength signal that may have traversed up to 140 km or more before reaching the remote site.
- Terminal demultiplexer. The terminal demultiplexer breaks the multi-wavelength signal back into individual signals and outputs them on separate fibers for client-layer systems (such as SONET/SDH) to detect.
- Optical Supervisory Channel (OSC). This is an additional wavelength usually outside the EDFA amplification band. The OSC carries information about the multi-wavelength optical signal as well as remote conditions at the optical terminal or EDFA site. OSC is also used for remote software upgrades and user information.
Since each channel is demultiplexed at the end of the transmission back into the original source, different data formats being transmitted at different data rates can be transmitted together. This dramatically reduces the need for discrete spare pluggable modules, when a handful of pluggable devices can handle the full range of wavelengths.
If you are looking for an experienced fiber optic cabling company or a cable contractor in Arizona, CTS Cabling is highly knowledgeable in DWDM technology.
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