As defined in ITU-T Recommendation G.652, the attenuation constant at 1310nm and 1550nm should be less than 0.5dB/km and 0.4dB/km, respectively.ĭispersion in fiber refers to a physical phenomenon of signal distortion caused when various modes carrying signal energy or different frequencies of the signal have different group velocity and disperse from each other during propagation. Outline the methods to against the factors.Ĭombining the above losses, the attenuation constant of single mode fiber at 1310nm and 1550nm wavelength areas is 0.3~0.4dB/km (1310nm) and 0.17~0.25dB/km (1550nm), respectively. 4.Single fiber bidirectional transmission (can or can not )_ use the same wavelength for transmitting and receiving. Need additional wavelength to transmit in the fiber (True or False) _.
įewer channels=cheaper hardware No amplification=a lower-cost system and distance-limited systemĭWDM 100GHz/50GHz/25GHz C-band: 1529nm~1561nm L-band: 1570nm~1603nmįill in the blanks: 1.WDM System includes:_, _, _ and _ Ģ.CWDM system could use optical amplifiers (True or False) _ 3.ESC means_. Smooth expansion: modularization and no affect the existing services.ĬWDM greatly reduces the system cost while providing certain amount of wavelengths and transmission distance within 100 km. Long Haul transmission: 5000km without REG / 230km long hop. WDM doesn’t change the structure or any byte in the frame for the client signal. Up to know the capacity is 1920Gbps at most.
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Huawei series OSN products could support this function.Ĭan some channels use OTU and some channels use colored interface? The optical interface in the client equipment that could provide standard wavelength is called colored interface.
Integrated system does not adopt the wavelength conversion technology, instead, it requires that the wavelength of the optical signals at the multiplex terminal conforms to the specifications for the WDM system. Open system has no special requirements for multiplex terminal optical interfaces, the only requirement is that these interfaces meet the optical interface standards defined in ITU-T. This mode is usually used in the CWDM system to reduce the cost. To MUX/DEMUX the signals in one fiber, circulator is recommended. The single fiber transmits optical signals in both directions simultaneously, and the signals in the different directions should be assigned on different wavelengths. This tansmission mode is widely used in the worldwide.īi-directional wave WDM system utilizes only one optical fiber. One only implements the transmission of signals in one direction while the other implements the transmission of the signals in the opposite direction. Unidirectional WDM system adopts two optical fibers. ODU: Demultiplex one main path signal into several individual signals. OMU: Multiplex several services with different wavelength into one main path signal. OTU: Access the client service and convent the wavelength complied with ITU standards. WDM allows for a greater range of protocol transmission better suited than legacy network for data centric applications.
WDM allows for a more efficient use of existing fiber by providing multiple optical paths along a single (pair of) fiber (s). How specific ? Please refer to ITU-T series recommendations in chapter 4. Key word in the content is specific wavelength. The Greek letter lambda ( ), is often used to designate individual wavelengths. Wave Division Multiplexing is a technology that utilizes the properties of refracted light to both combine and separate optical signals based on their wavelengths within the optical spectrum. WDM is widely used in the national and metro backbone transmission systems.Ĭolored Car: Service in different channels (wavelength) This technology keeps the same fiber, the same bit rate, but uses multiple colours to multiply transported capacity. The way to scale to higher transported capacity is WDM. Additionally, the maximum transported capability over a fiber pair is in the range of a few 10Gbps. The equipment is getting more and more complicated and expensive. TDM keeps the same transmission medium but increases the bit rate.
SDM increases the transmission capacity linearly by adding the number of optical fibers, and the transmission equipment will be increased linearly, too. To make comparison between CWDM and DWDM. To outline the WDM background and technical features To list the components of WDM and their functions ITU-T G.671 (about the optical passive components) OTC000003 WDM principle ITU-T G.694.1 and G.694.2 (about the wavelength distribution) 1 WDM Overview.Ģ WDM Transmission Media.ģ WDM Key Technologies.Ĥ Technology Specifications for WDM System.Ĭonfidential Information of Huawei.
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