Dual-band erbium ytterbium doped optical fiber pulse amplifier

Abstract

The invention relates to the field of fiber lasers and provides an optical fiber pulse amplifier which can be used for amplifying pulse signals of two bands. The technical scheme includes that a dual-band erbium ytterbium doped fiber optic pulse amplifier comprises a pumping source, a pumping-source pulse driving power source, two different band signal sources, signal source pulse driving power sources, a time-delay control circuit, isolators, a wavelength division multiplexer, a pumping / signal combiner, gain fiber and a fiber end cap. The pumping-source pulse driving power source is used for driving the pumping source to send out laser pumping pulses which are injected into the gain fiber to pump the same via the pumping / signal combiner; synchronizing signals sent out by the pumping-source pulse driving power source are properly delayed through the time-delay control circuit to trigger two signal source pulse driving power sources to drive the two different band signal sources to send out signal pulses respectively; and two signal pulses pass the respective isolators and are coupled together to perform amplifying output via the wavelength division multiplexer. The optical fiber pulse amplifier is mainly applicable to amplification of the dual-band pulse signals.

Description

technical field [0001] The invention relates to the field of optical fiber lasers, in particular to an optical fiber amplifier capable of amplifying pulse signals in two wavebands of 1.06 μm and 1.55 μm. Specifically, the invention relates to a dual-band erbium-ytterbium co-doped optical fiber pulse amplifier (EYDFA) which uses a pulse pumping method to effectively amplify dual-band signals. technical background [0002] In order to obtain high-power laser output while maintaining good beam quality, high-power fiber lasers usually use a main oscillator + power amplifier structure. The seed light with good beam quality but low power is generated by the main oscillator, and then sent to the power amplifier to increase the laser output power. Obviously, the performance of the power amplifier has a decisive effect on the performance of the whole laser system. In the 1.55μm band, the power amplifier stage is usually EYDFA using double-clad erbium-ytterbium co-doped fiber as the...

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Problems solved by technology

On the one hand, this reduces the conversion efficiency of the pump power to the signal in the Er band (1500-1600nm), on the other hand, it also produces parasitic oscillations or even self-pulsation in the Yb band, which greatly reduces the performance of the amplifier and even causes permanent damage.

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