What’s EDFA Amplifier

What’s EDFA Amplifier

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.

Beijing Rofea Optoelectronics Co, Ltd located in China’s “Silicon Valley” – Beijing Zhongguancun,Is a high-tech enterprise dedicated to serving domestic and foreign research institutions, research institutes, universities and enterprise scientific research personnel.Our company is mainly engaged in the independent research and development, design, manufacturing, sales of optoelectronic products, and provides innovative solutions and professional, personalized services for scientific researchers and industrial engineers.After years of independent innovation, it has formed a rich and perfect series of photoelectric products, which are widely used in municipal, military, transportation, electric power, finance, education, medical and other industries.Great advantages in the industry, such as customization, variety, specifications, high efficiency, excellent service.And in 2016 won the Beijing high-tech enterprise certification, has many patent certificates, strong strength, products sold at home and abroad markets, with its stable, superior performance to win the praise of users at home and abroad!