Optical amplifier

What is an optical amplifier?
An optical amplifier is nothing but a laser without feedback. Optical amplification depends on the frequency of the incident signal and local beam intensity. Read more

Types of an optical amplifier : 

Semiconductor optical amplifier :
The optical amplifier is nothing but a laser diode without feedback. Which introduce in 1990. It is mainly used in the inline optical amplifier. Semiconductor optical amplifier is a laser diode without end mirror. Read more

Advantages and disadvantages of SOA :
Advantages: 1. Small size 2. Electrically pumped
Disadvantages: 1. Lower gain 2. High non-linearity Read more

Erbium-doped fiber amplifier :
An optical amplifier is also called an erbium-doped fiber amplifier or EDFA. An  Erbium-doped fiber amplifier is an optical amplifier that amplified a modulated laser beam directly, without electron-optical or optoelectronic conversion. Read more

Advantages and disadvantages of EDFA :
Advantages: 1. Good gain stability 2. A high energy conversion efficiency
Disadvantages: 1. Gain up flatness 2. Optical surge problem Read more

Application of EDFA
1. Telephone area 2. Used to generating very high output power Read more

Raman amplifier
Raman amplifier is also a relatively mature optical amplifier. In Raman amplifier, the optical signal can be achieved by using stimulated Raman scattering, stimulated Brillouin scattering or stimulated for photon mixing giving parametric gain by injecting a high power laser beam into the optical fiber. Read more

Advantages and disadvantages of Raman amplifier :
Advantages: 1. Compatible with installed SM fiber 2. Variable wavelength amplification possible
Disadvantages: 1. Low efficiency 2. High cost Read more