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Erbium-doped optical fiber is used for what purpose?
It is used to make Erbium doped fibre amplifiers (EDFA) and also used to fabricate DFB lasers.
What is an optical amplifier EDFA for a WDM system?
What's EDFA? Erbium-Doped Fiber Amplifier (EDFA) is an optical amplifier used in the C-band and L-band, where the loss of telecom optical fibers becomes lowest in the entire optical telecommunication wavelength bands. It is used in the telecommunications field and in various types of research fields. An EDFA is "doped" with a material called erbium. Optical amplifiers can directly amplify optical signals without converting the signals into electrical signals before amplification, which is also the most prominent function and is an important optical component in long-distance optical communication. EDFA has been widely used in DWDM system, usually used to compensate the link loss in long-distance optical communication. The most important feature is to amplify multiple optical signals at the same time and can be easily combined with Wavelength division multiplexing (WDM) technology. The common bands of EDFA are C-band and L-band. Wavelength division multiplexing (WDM) techniques combined with erbium-doped fiber amplifier (EDFA) increases the capacity of light wave transmission, provides high capacity and improves flexibility of optical network technology. EDFA Working Principle EDFA works on the principle of stimulating the emission of photons. With EDFA, an erbium-doped optical fiber at the core is pumped with light from laser diodes. The erbium-doped fiber (EDF) is at the core of EDFA technology, which is a conventional silica fiber doped with Erbium. It is a conventional silica fiber doped with erbium. When the Erbium is illuminated with light energy at a suitable wavelength (either 980nm or1480nm), it is excited to a long lifetime intermediate state, then it decays back to the ground state by emitting light within the 1525-1565nm band. When the light energy already exists within the 1525-2565nm band, for example due to a signal channel passing through the EDF, then this stimulates the decay process, resulting in additional light energy. Baisc configuration of EDFA EDFA configuration is mainly composed of erbium-doped fiber (EDF), pump laser, coupler, WDM, optical isolator, gain flattening filter (GFF), variable optical attenuators (VOA) and photodetector (PD). In principle, EDFAs can be designed such that pump energy propagates in the same direction as the signal (forward pumping), the opposite direction to the signal (backward pumping), or both direction together. Coupler: the optical power is branched and transmitted according to a certain proportion, usually using the melting taper process. WDM: a passive optical device that mixes up the input optical signal and the light wave output from the pump light source, generally using a wavelength division multiplexer(WDM). Optical Isolator: a device that prevents reflected light from affecting the stability of optical amplifier and ensures that the optical signal can only be transmitted in the forward direction. EDF: EDF is the main body of the optical amplifier. It can be used to design erbium-doped optical amplifiers (EDFA) for telecommunication in the C and L band and sensing applications. Pump Laser: a semiconductor laser with center wavelength 980nm that provides energy for signal amplification, the output optical power ranges from 10mW to 1W. GFF: suppress ASE noise to reduce the impact of noise on EDFA performance and improve EDFA gain flatness and OSNR. VOA: a device that dynamically adjusts optical power, often used in adjusting the gain slope and power attenuation. PD: monitor the input and output optical power in real time. Types of EDFA Optical Amplifiers Booster Amplifier An amplifier operates at the transmission side of the link, designed to amplify the signal channels exiting the transmitter to restore the strength of a transmitted signal. When used as the booster amplifier, EDFA is deployed in the output of an optical transmitter to improve the output power of the multi-wavelength signal having been multiplexed. Pre-amplifier A pre-amplifier EDFA operates at the receiving end of a DWDM link. The pre-amplifier is used to compensate for losses in a demultiplexer near the optical receiver. It operates at the receiving end of a DWDM link and works to enhance the signal level before the photo detection takes place in an ultra-long haul system.Being equipped with these features, EDFA can significantly improve the sensitivity of an optical receiver when deployed in the input of an optical receiver.
What has the author Douglas Baney written?
Douglas Baney has written: 'Optical power and wavelength for single-source simulation of EDFA WDM gain' -- subject(s): Multiplexing, Optical amplifiers, Optical fibers
What Are the Common Optical Devices in DWDM System?
Dense wavelength-division multiplexing (DWDM) is an optical fiber multiplexing technology that is used to increase the bandwidth of existing fiber networks. It combines data signals from different sources over a single pair of optical fiber, while maintaining complete separation of the data streams. This is a laser technology used to increase bandwidth over existing fiber optic backbones. DWDM technology is an extension of optical network, the main advantage of DWDM is that it is independent of protocol and transmission rate, DWDM-based network can transmit data in IP, ATM, SONET, SDH and Ethernet. Optical devices in DWDM system: DWDM optical transceiver modules, DWDM MUX/DEMUX, DWDM OADM and optical amplifiers. DWDM Transceiver Modules DWDM optical module is an important device for photoelectric signal conversion. Every DWDM transceiver module has its own specific wavelength, using DWDM technology can greatly save fiber resources. Most DWDM transceiver modules (DWDM SFP，DWDM SFP+，DWDM XFP, etc) on the market today are operating at 100GHz and 50GHz. DWDM Mux/Demux DWDM Mux combines data signals from different sources over a single pair of optical fiber, while maintaining complete separation of the data streams. Conversely, DWDM Demux refers to the type of combinational circuit that accepts just a single input but directs it through multiple outputs. Instead of using a single fiber in each pair of optical transceiver modules, DWDM allows multiple optical channels to share the same fiber optic cable. AAWG Athermal AWG (Arrayed Waveguide Grating), or AAWG, is based on silica-on-silicon planar technology. It mainly realizes the functions of multiplexing and demultiplexing for more than 16 channels. AAWG has thermal stability and improved ITU-Grid accuracy that ITU-G694.1 requires for with wider transmission bandwidth, thus it can be applied to high-end areas such as Metro/long-haul DWDM optical communication system. DWDM OADM An optical add-drop multiplexer (OADM) is a device used in wavelength-division multiplexing systems for multiplexing and routing different channels of light into or out of a single mode fiber. The OADM based on DWDM technology is moving the telecommunications industry significantly closer to the development of optical networks. The OADM can be placed between two end terminals along any route and be substituted for an optical amplifier. Commercially available OADMs allow carriers to drop and/or add up to multi channels between DWDM terminals. By deploying an OADM instead of an optical amplifier, service providers can gain flexibility to distribute revenue–generating traffic and reduce costs associated with deploying end terminals at low traffic areas along a route. Erbium-doped optical Fiber Amplifier Erbium-doped optical Fiber Amplifier (EDFA) is now most commonly used to compensate the loss of an optical fiber in long-distance optical communication. Another important characteristic is that EDFA can amplify multiple optical signals simultaneously, and thus can be easily combined with WDM technology. Optical amplifiers can amplify optical signals in a wide wavelength range, which is very important for DWDM system applications. In contrast to the EDFA used in CATV or SDH systems, the EDFA in DWDM system is also referred to as DWDM EDFA.To extend the transmission distance of the DWDM system, you can choose from different types of optical amplifiers,including DWDM EDFA, CATV EDFA, SDH EDFA, EYDFA and Raman amplifier, etc.
Is thalidomide used to treat cancer?
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When do you use are or is?
He is. She is. It is. They are. We are. You are. (I am).
What were Aboriginal tools mostly used for?
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Is corel draw a computer language?
No. It is an application used for graphics.No. It is an application used for graphics.No. It is an application used for graphics.No. It is an application used for graphics.No. It is an application used for graphics.No. It is an application used for graphics.No. It is an application used for graphics.No. It is an application used for graphics.No. It is an application used for graphics.No. It is an application used for graphics.No. It is an application used for graphics.
Why save a file as html?
So that it can be used as a web page.So that it can be used as a web page.So that it can be used as a web page.So that it can be used as a web page.So that it can be used as a web page.So that it can be used as a web page.So that it can be used as a web page.So that it can be used as a web page.So that it can be used as a web page.So that it can be used as a web page.So that it can be used as a web page.
What flammable gas used to be used in airships?
Hydrogen used to be used in airships.
What is the use of weight sets?
They are used for weighing.They are used for weighing.They are used for weighing.They are used for weighing.
How did the retiarii gladiators fight?
They used the net and trident.They used the net and trident.They used the net and trident.They used the net and trident.They used the net and trident.They used the net and trident.They used the net and trident.They used the net and trident.They used the net and trident.
