|
|
|
Theory of noise in kilo-Hz cascaded high-energy Yb-doped nanosecond pulsed fiber amplifier |
| Beijing Institute of Technology |
|
|
|
|
Abstract A theoretical analysis of noise in high-power cascaded fiber amplifier is presented. Unlike the noise theory in low power communication, the noise of high power system is redefined as the leaked output energy between pulses with coherent beat noise uncounted. This definition is more appropriate for high power usage which pays much more attenuation on pulse energy than pulse shape integrity. Then the low power pre-amplifying stages are considered as linear amplification and analyzed by linear theory. In the high-power amplification stages, the inversion is assumed to recover linearly in the time interval between pulses. The time shape of the output pulse is different from that of the input signal because of different gains at the front and back ends of the pulse. Then, a criterion is provided to distinguish the nonlinear and linear amplifications based on the signal-to-noise ratio (SNR) analysis. Then, an experiment that showed that the output SNR actually drops in nonlinear amplification is performed. The change in the noise factor can be well evaluated by pulse shape distortion.
|
Received: 04 February 2013
Published: 31 October 2013
|
Cite this article:
Theory of noise in kilo-Hz cascaded high-energy Yb-doped nanosecond pulsed fiber amplifier Chin. Phys. B 0
|
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
