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How do you increase performance of ED-FA?

Updated: 8/19/2019
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Q: How do you increase performance of ED-FA?
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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.


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