EDFA (Erbium-doped Fiber Amplifier), firstly invented in 1987 for commercial use, is the most deployed optical amplifier in the DWDM system that uses the Erbium-doped fiber as optical amplification medium to directly enhance the signals. It enables instantaneous amplification for signals with multiple wavelengths, basically within two bands. One is the Conventional, or C-band, approximately from 1525 nm to 1565 nm, and the other is the Long, or L-band, approximately from 1570 nm to 1610 nm. Meanwhile, it has two commonly used pumping bands, 980 nm and 1480 nm. The 980nm band has a higher absorption cross-section usually used in low-noise application, while 1480nm band has a lower but broader absorption cross-section that is generally used for higher power amplifiers.
The following figure detailedly illustrates how the EDFA amplifier enhance the signals. When the EDFA amplifier works, it offers a pump laser with 980 nm or 1480 nm. Once the pump laser and the input signals pass through the coupler, they will be multiplexed over the Erbium-doped fiber. Through the interaction with the doping ions, the signal amplification can be finally achieved. This all-optical amplifier not only greatly lowers the cost but highly improves the efficiency for optical signal amplification. In short, the EDFA amplifier is a milestone in the history of fiber optics that can directly amplify signals with multiple wavelengths over one fiber, instead of optical-electrical-optical signal amplification.
Rofea Optoelectronics offers a product line of commercial electro-optic modulators,phase modulators,photodetectors,laser light sources,dfb lasers,optical amplifiers,EDFAs,SLD laser,QPSK modulation,pulse laser,light detector,balanced photodetector,Semiconductor laser,laser driver,fiber coupler,pulsed laser,fiber optic amplifier,optical power meter,broadband laser,Tunable laser,optical delayelectro optic modulator,Optical detector,Laser diode driver,Fiber amplifier,erbium doped fiber amplifier,laser light source,Light source laser. We also provide many particular modulators for customization, such as 1*4 array phase modulators, ultra-low Vpi, and ultra-high extinction ratio modulators, primarily used in universities and institutes.They have a wavelength range of 780 nm to 2000 nm with electro-optic bandwidths up to 40 GHz with low insertion Loss, low Vp, high PER. Suitable for a variety of applications from analog RF links to high-speed communications.
Post time: Apr-21-2023