Dual-polarization optical fiber amplifier

Abstract

The invention discloses a dual-polarization optical fiber amplifier, which comprises a pumping source, a polarization-maintaining erbium-doped optical fiber and a birefringent polarization-maintainingfiber bragg grating, wherein the pumping source is used for outputting pumping light; the polarization-maintaining erbium-doped optical fiber is used for amplifying input signal light by utilizing the pump light; and the birefringent polarization-maintaining fiber bragg grating is used for converting the amplified signal light into dual-polarization-state amplified signal light with a stable polarization state. The dual-polarization optical fiber amplifier provided by the invention is novel in structure, optical signal amplification in two polarization directions can be realized, high gain isobtained, and the dual-polarization-state signal light is output at the same time. According to the invention, the polarization state transmitted in the optical fiber is utilized, so that the opticalsignal can be amplified in two polarization directions at the same time, the optical fiber amplification system is utilized more efficiently, the cost of the optical fiber amplifier system is reduced, and the dual-polarization optical fiber amplifier has very important application in optical fiber communication and optical fiber sensing systems.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a dual-polarization optical fiber amplifier. Background technique [0002] At present, the optical fiber amplifier in the market is an indispensable key device in the optical fiber communication system. It not only can directly amplify the optical signal, but also has the function of real-time, high gain, broadband, online, low noise, and low loss all-optical amplification. Fiber amplifiers mainly include erbium-doped fiber amplifiers, semiconductor optical amplifiers and fiber Raman amplifiers, among which erbium-doped fiber amplifiers are widely used in long-distance, large-capacity, high-speed optical fiber communication systems, access networks, and fiber optic CATV due to their superior performance. Network, military system and other fields. [0003] With the development of optical fiber communication technology and optical fiber sensing technology, especially in so...

AI Technical Summary

Problems solved by technology

[0003] With the development of optical fiber communication technology and optical fiber sensing technology, especially in some coherent communication and coherent sensing systems, it is necessary to have a light source with stable polarization and high power output or to amplify weak signals at the receiving end of coherent light. Ordinary erbium-doped fiber amplifiers cannot meet the requirements because they will change the polarization state of the laser during the amplification process, which requires a fiber amplifier that can maintain the polarization characteristics of the laser and achieve high gain

Common polarization-maintaining fiber amplifiers or linearly polarized fiber amplifiers have a polarization extinction ratio above 20dB, or have polarization crosstalk, and the polarization state is unstable and easy to change

Images