Wavelength Division Multiplexing (WDM) technology is a technology that simultaneously transmits multiple wavelength optical signals in a fiber optic fiber supplier. In order to make full use of the huge bandwidth resources brought by the low-loss area of the single-mode fiber, the low-loss window of the fiber can be divided into several channels according to the frequency (or wavelength) of each channel, and the light wave is used as the carrier of the signal. The transmitter uses a WDM multiplexer supplier (synthesizer) to combine signal optical carriers of different specified wavelengths into one optical fiber for transmission.
The composition of the wavelength division multiplexing system
Optical Multiplexer (MUX): Multiple wavelengths are multiplexed into one fiber for transmission.
Optical Power Amplifier (OBA): compensates for the loss of the optical multiplexer and increases the fiber input power.
Optical Line Amplifier (OLA): compensates for fiber loss.
Optical Preamplifier (OPA): Improves the receive level and improves receiver sensitivity.
Optical Demultiplexer (DEMUX): Multiple wavelengths are split into individual fibers to separate the channels.
Optical Interface Converter (OTU): Converts the optical signal of a conventional SDH into a signal suitable for DWDM transmission.
Optical Monitoring Channel (OSC): A channel dedicated to the transmission of the monitoring system.
Wavelength division multiplexing
1 Make full use of the huge bandwidth resources of fiber
2 multiple types of signals can be transmitted simultaneously
3 System protection can maximize the protection of existing investments
4 High networking flexibility, economy and reliability
5 Reduce the ultra-high speed requirements of the device
6 compatible with all-optical switching
A WDM system can carry “service” signals in multiple formats, such as ATM, IP, etc.; in the network expansion and development, it is an ideal means of expansion, and is also the introduction of new broadband services (such as CATV, HDTV and B-ISDN, etc.) Advantageously, adding an additional wavelength can introduce any desired new service or new capacity; using WDM technology to achieve network switching and recovery, thereby enabling future transparent, highly survivable optical networks.
Wavelength division multiplexing classification
The design of the communication system is different, and the width of the interval between each wavelength is also different. According to the channel spacing, HTFuture WDM can be subdivided into CWDM (Sparse Wavelength Division Multiplexing) and DWDM (Dense Wavelength Division Multiplexing). The channel spacing of CWDM is 20nm, and the channel spacing of DWDM is from 0.2nm to 1.2nm, so CWDM is called sparse wavelength division multiplexing technology compared to DWDM.
If need more information about the DWDM/CWDM system, feel free contact Ivy: sales6@htfuture.com
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