What is DCM in DWDM?
A Dispersion Compensation Module (also called a Dispersion Compensation Fiber (DCF)) provides fixed chromatic dispersion compensation for diverse and disaster recovery DWDM networks.
How DCM is used in DWDM?
Typically, a DCM module provides a fixed amount of dispersion (e.g. normal dispersion in the 1.6-μm spectral region), although tunable dispersion modules are also available. A dispersion compensation module is often placed between two fiber amplifiers in a long-haul DWDM system.
What is DCM in telecom?
The Discrete Control Module (DCM) is the perfect solution for controlling devices at remote locations if you have only a few points or have a limited budget. You can monitor 2 alarm inputs and operate up to 16 control relays.
What is a DCM card?
Department Card Managers (DCM)
What is DCM in WDM?
Each DCM has two fiber connectors to receive and send optical signals, which are connected to the optical interface of the corresponding board through optical fibers.In WDM systems, DCM is used to compensate for chromatic dispersion; DCU is used to compensate for chromatic dispersion in MSTP systems.
How do you compensate chromatic dispersion?
FIBER GRATINGS A key technology for long-haul fiber links is therefore ‘dispersion compensation’. The most common solution has been ‘dispersion compensating fiber’ (DCF), which is simply fiber in which the chromatic dispersion has been engineered to be the exact opposite of the dispersion in the fiber link.
What is dispersion compensation?
Dispersion compensation is the compensation of the fact that the speed of light in a given medium is depending on the wavelength. Especially laser pulses with short pulse durations in the ultrafast range.
What is full form of DCM?
The Full form of DCM is Dilated Cardiomyopathy. DCM is when the heart’s ability to pump blood is reduced because the left ventricle (its main pumping chamber), is enlarged and weakened. In some cases, this prevents the heart from filling with blood as it should.
What is normal and anomalous dispersion?
Normal and Anomalous Dispersion One distinguishes normal dispersion (for k” > 0) and anomalous dispersion (for k” < 0). Normal dispersion, where the group velocity decreases with increasing optical frequency, occurs for most transparent media in the visible spectral region.
What is dispersion compensation fiber?
Dispersion compensation essentially means canceling the chromatic dispersion of some optical element(s). However, the term is often used in a more general sense of dispersion management, meaning the control (but not necessarily the complete compensation) of the overall chromatic dispersion of some system.
What are the two reasons for chromatic dispersion?
Chromatic dispersion arises for two reasons.
- The first reason is that the refractive index of silica, the material used to make optical fiber, is frequency dependent.
- Although material dispersion is the principle component of chromatic dispersion for most fibers, there is a second component, called waveguide dispersion.
Why does chromatic dispersion happen?
Chromatic dispersion occurs in single-mode fibers because the different wavelengths being transmitted by the laser have different propagation times through the fiber.
What is a Cisco DWDM SFP module?
Figure 1. ● Hot-swappable input/output device that plugs into Gigabit Ethernet SFP ports or slots of a Cisco switch or router, linking the port with the network The Cisco DWDM SFP module is supported across a variety of Cisco switches, routers, and optical transport devices.
What is dispersion compensation module (DCM)?
But with a DCM module, the lost signals can be compensated before the receiver can effectively neutralize the fiber’s dispersion, which eventually guarantees normal working and ensures reliable long-haul transmission. Figure 2: Use Case of Dispersion Compensation Module
What is the DCM used for?
The DCM can be used to compensate for chromatic dispersion from 10 Mbps to 40 Gbps data rates in ultra long haul coherent networks, such as SDH/SONET, CATV and DWDM systems.
What is the dispersion coefficient of DCM fiber?
The value for regular single mode fiber is around +16~17 ps/ (nm*km) at 1550 nm. To properly manage this, the DCM is built by using a special type of dispersion compensating fiber inside the module that has a negative value of dispersion coefficient, ranging from -30 to -300 ps/ (nm*km).