Saturation Characteristics of Regenerative Erbium-Doped Fiber Amplifier

Abstract

We propose a simple technique for local measurement of the nematic pretilt on a solid substrate, using standard planar orientation on the opposite surface. We obtain the pretilt from the variation of the cell birefringence under weak electric field. We apply experimentally the proposed technique to measure the pretilt of the nematic 5CB on various substrates. We discuss the advantages and the limitations of our technique.

Regenerative Er-doped Fiber Amplifier System for High-repetition-rate Optical Pulses

“…The first kind is based on a fiber loop amplifier without any optical switch [9][10][11][12]. This kind of design has simpler structure and also has the potential to support the amplification of the pulse train with high repetition rate.…”

“…It has been reported that the CW signal regenerative amplifier has higher gain and lower noise over the conventional singlepass configuration. Saturation characteristics of regenerative Erbium-doped fiber amplifier and gain characteristics of different pump structure were also discussed by Teyo [10][11]. The further dynamic characteristics of the regenerative erbium-doped fiber ring amplifier were discussed by B.P.…”

“…In contrast to the first kind, the second kind of regenerative amplifier is of optical switch, such as AOM. The structure of regenerative amplifiers is different from the regenerative amplifiers described in ref [9][10][11][12]. In 2006, Yang demonstrated an all-fiber-based ring-cavity Q-Switched regenerative Erdoped amplifier that achieved 40 dB gain and 30nJ output pulse energy at 1.53 μm [13].…”