High-signal to noise ratio (SNR) optical fiber amplifier

Abstract

The invention provides a high-signal to noise ratio (SNR) optical fiber amplifier. In the high-SNR optical fiber amplifier, an optical fiber amplification module, a first polarization controller, an optical fiber polarizer, a second polarization controller, a non-linear polarization rotating unit, a third polarization controller, a polarization beam splitter and an optical fiber isolator are connected with one another sequentially. The high-SNR optical fiber amplifier can amplify an optical pulse signal and can effectively inhibit continuous amplified spontaneous emission noise at the same time to output the optical pulse signal with very high contrast ratio. The structure of combining the polarizer and the polarization beam splitter is adopted, isolation effect on backward opposite laser is achieved and the optical fiber amplifier has high stability. The high-SNR optical fiber amplifier adopts an all-optical-fiber structure of the optical fiber polarization controllers, the optical fiber polarizer and the optical fiber polarization beam splitter, and has a simple structure, high stability and low cost.

Description

technical field [0001] The invention belongs to the technical field of high-power short-pulse laser amplification devices, and in particular relates to a high-signal-to-noise-ratio optical fiber amplifier suitable for high-power short-pulse laser amplification. Background technique [0002] At present, known optical fiber amplifiers are mainly composed of amplification modules. The pumping laser emitted by the laser diode is coupled into the doped fiber in the amplification module through the wavelength division multiplexer to continuously pump the doped medium, so that the optical signal coupled into the doped fiber through the wavelength division multiplexer is amplified. However, due to the continuous pumping method, the doped medium continuously generates a large amount of amplified spontaneous emission (ASE) noise, which greatly reduces the signal-to-noise ratio of the optical signal, especially for cascaded short pulses (nanoseconds, picoseconds or femtoseconds) Secon...

AI Technical Summary

Problems solved by technology

However, due to the continuous pumping method, the doped medium continuously generates a large amount of amplified spontaneous emission (ASE) noise, which greatly reduces the signal-to-noise ratio of the optical signal, especially for cascaded short pulses (nanoseconds, picoseconds or femtoseconds) second level) fiber amplifier, amplifying spontaneous emission noise and even submerging the main pulse signal completely

The use of optical switches can suppress part of the ASE noise, but for high-power short-pulse fiber amplifiers, it cannot be effectively used for high-power short-pulse laser amplifiers due to the influence of the damage threshold of the switch and the controllable width and response speed of the switch. ASE noise suppression

Images