Characteristics of dense wave multiplexing DWDM and basic structure

- Jul 06, 2016-

Dense wave multiplexing is able to combine a set of optical wavelength transmitted by a single optical fiber. This is a used in existing fiber backbone bandwidth of laser technology. More specifically, this technology is in a specified fibre, multiplexing a single fiber-optic carrier close spectrum space to take advantage of performance can be achieved. In this way, under the given information transfer capability, you can reduce the total number of fibre needed.
DWDM can be on the same fiber, combination and transmission of different wavelengths at the same time. In order to ensure effective, one fiber conversion for multiple virtual fibre. So, if you plan to reuse 8 optical carrier (OC), a fiber transmission 8 signals, so that transmission capacity will be increased from 2.5Gb/s to 20Gb/s. March 2013 for data collection, using the DWDM technology, single fiber can transmit more than 150 simultaneous transmission of multiple beams of different wavelengths of light, each Shu Guangbo 10Gb/s speed to a maximum transfer rate. As manufacturers added more to each fibre channel Terabits per second transmission speed is just around the corner.
A key benefit of DWDM is Protocol and transmission speed is not relevant. Based on DWDM networks can use IP protocols, ATM, SONET/SDH, Ethernet protocol to transfer data, processing of data traffic between 100Mb/s and 2.5Gb/s. In this way, network based on DWDM in a laser channel transmission at different speeds on different types of data traffic. QoS (quality of service) point of view, based on DWDM networks at a low cost way to quickly respond to customer's bandwidth requirements and protocol change.
DWDM in terms of structure, there are currently integrated systems and open systems. Integrated system: for the access to the single terminal optical signal is to meet g optical transmission equipment. 692 standard light sources. Open system, is in the wave front and back-end of the wave, and wavelength transfer unit OTU, typically used by current g. 957 interface conversion for G. 692 standard wavelength of the optical interface. In this way, open system using wavelength conversion technology? Any meet g. 957 recommends requirements for optical signals using optical-electrical-optical method of adoption of wavelength conversion conversion to meet g. 692 requirements specification-wavelength optical signals by wavelength division multiplexing and DWDM transmission system.
DWDM systems currently offers 16/20 wave 32/40 wave or single fiber transmission capacity of up to 160, with flexible expansion capabilities. User is able to build in the early 16/20 wave system, needed after upgrading to 32/40, this saves the initial investment. Its upgrade programme principles: one is in the c-band red with 16 plus Bleu 16-wave upgrade to 32 programmes; the other is the interleaver, c-band 200GHz 16/32 upgrade for the 100GHz intervals 20/40 interval between waves. Further expansions, and can provide the c + l-band scheme, to further expanding the transmission capacity is 160.

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