Sub-Microsecond Pulsed Pumping as a Means of Suppressing Amplified Spontaneous Emission in Tandem Pumped Fiber Amplifiers

PROJECT TITLE :

Sub-Microsecond Pulsed Pumping as a Means of Suppressing Amplified Spontaneous Emission in Tandem Pumped Fiber Amplifiers

ABSTRACT:

We tend to propose a new tandem pumping theme in 3-level rare-earth-doped optical fibers, where energy storage in a pump fiber laser enables much shorter ( $sim 500$ ns) pump pulses than is possible with pulsed diode laser pumping. This has the effect of reducing the time throughout that the ultimate amplifier has high inversion and, hence, reduces the amplified spontaneous emission (ASE) compared with continuous wave (CW) tandem pumping. We tend to simulate the gain and ASE dynamics in a pulse-pumped Yb-doped fiber amplifier and show that the ratio of amplified signal to ASE background will be improved by up to two orders of magnitude over a massive vary of pulse energies compared with CW tandem pumping. Sub-microsecond pulsed tandem pumping offers a relatively simple, as yet experimentally untried, way to substantially cut back undesirable ASE compared with the amount in diode-pumped fiber amplifiers.

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