Wavelength Division Multiplexing Technique - Zte Unitrans ZXMP M600 Technical Instructions

ZXMP M600 (V1.0) Technical Manual
1.1.1.3 Features of Metro Optical Network
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1.1.2 Wavelength Division Multiplexing Technique

As MAN services become increasingly abundant, the requirement on the MAN
capacity becomes higher and higher. As a result, the multi-service broadband MAN
gradually becomes a hotspot in the telecom and network construction. To use the
existent optical fiber resources to increase the bandwidth capacity, the Wavelength
Division Multiplexing (WDM) technique is adopted in the MAN.
WDM can be divided into Dense Wavelength Division Multiplexing (DWDM)
technique and Coarse Wavelength Division Multiplexing technique.
1.1.2.1 DWDM Technique
The DWDM technique adopts an Erbium Doped Fiber Amplifier (EDFA), a high
wavelength stability laser and dense wavelength division multiplexing/ demultiplexing
Large service access capacity
The rapid development of MAN service causes the acute increase in the demand
for bandwidth. This demand can only be met by large-capacity metro optical
network. Thus, the core layer of the metro optical network should have large
service access capacity and should be capable of continuous upgrading.
Multi-service convergence and transparent transmission
To make full use of the existing network resources, the core layer should be able
to converge various low-rate services and encapsulate services of different rates
and with different protocols into a single wavelength. This helps save the
wavelength resources and economize network construction. On the other hand,
to avoid extra overhead due to protocol conversion and frame format matching
and to make full use of the bandwidth resources, the core layer is also required
to transmit the carried services in the original mode.
High reliability and powerful network protection capability
The network security and reliability guarantee normal service transmission.
Thus, redundancy protection measures should be provided for the hardware on
the equipment. Besides, channel protection and multiplex section protection
should also be provided at various levels on the network.
Low networking cost
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