High Power Erbium-Ytterbium Co-Doped Fiber Amplifier with 1-micron Band Fiber Grating

Abstract

The invention relates to the fields of optoelectronic technology and fiber laser amplifiers. In order to solve the influence and limitation of Yb-ASE and the self-excited oscillation and self-pulsation caused by high-power pumping on the erbium-ytterbium co-doped fiber amplifier, the Yb-ASE can be effectively suppressed and the Improving the Stability and Pump Conversion Efficiency of Erbium-Ytterbium Co-doped Fiber Amplifiers. For this reason, the technical scheme that the present invention takes is, is made of input terminal, isolator, pump / signal beam combiner, fiber grating, erbium ytterbium co-doped optical fiber, output terminal; After the beam combiner is combined, it is sent into the erbium-ytterbium co-doped fiber through the fiber grating for pumping; the signal to be amplified is input from the input end, and then enters the erbium-ytterbium co-doped fiber through the isolator, the pump signal combiner, and the fiber grating. Amplify, and the amplified signal is output from the output terminal. The invention is mainly applied to the design and manufacture of optical fiber laser amplifiers.

Description

technical field [0001] The invention relates to the fields of optoelectronic technology and fiber laser amplifiers, in particular to an erbium-ytterbium co-doped fiber amplifier with a fiber grating in the 1-micron band at the pump end. Specifically, the present invention relates to a 1 micron band fiber grating with a suitable wavelength added at the pump end, through the selective reflection of the spontaneous radiation in the backward 1 micron band, to improve the stability and pump conversion efficiency of high-power erbium ytterbium Co-doped fiber amplifier. Background technique [0002] The output wavelength of the high-power erbium-ytterbium co-doped fiber amplifier is in the 1.5 micron band, which has the advantage of being safe for human eyes, and has important applications in laser processing, laser ranging, laser radar and other fields. Erbium-ytterbium co-doped fiber amplifier is a laser amplifier with erbium-ytterbium co-doped fiber as the gain medium. The gai...

AI Technical Summary

Problems solved by technology

Since the energy transfer rate of ytterbium ions to erbium ions is limited, when the pumping rate is greater than the energy transfer rate between the two, the number density of ytterbium ions in the upper energy level in the gain medium will increase, and these upper energy level ytterbium ions are in the When transitioning to the ground state, spontaneous emission (Yb-ASE) in the ytterbium ion band will be generated. As the pump power increases, Yb-ASE will continue to increase, and eventually self-oscillation or self-pulsation effects will occur, resulting in unstable output power of the amplifier or even cause permanent damage to the device

Under high power pumping, Yb-ASE and its self-excited oscillation and self-pulsation are the main factors affecting the stability of Erbium-Ytterbium co-doped fiber amplifiers and limiting their pump conversion efficiency and output power improvement.

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