Few-mode parameter and strong-coupling Raman combined amplification method and device

Abstract

The invention discloses a few-mode parameter and strong-coupling Raman combined amplification method. The method comprises the following steps of performing signal modulation on signal light to obtainsignal light with four polarization modes; enabling the signal light of the four polarization modes to enter a few-mode optical fiber through a photon lantern mode division multiplexing technology; carrying out signal modulation on the pump light to obtain pump light with four polarization modes, and coupling the four kinds of light into a long tapering optical fiber; the coupled and outputted pump light being coupled with signal light outputted by the few-mode optical fiber through phase matching, entering a coupler and then being inputted into an amplifier; and outputting the obtained amplified light in a balanced manner through a photon lantern. The invention further discloses a few-mode parameter and strong-coupling Raman combined amplification device. According to the method, high-gain and large-bandwidth amplification of signal light is realized; the amplified light beam is higher in signal-to-noise ratio and better in light beam quality, performance of the optical fiber communication system is effectively improved, and a transmission distance of the optical fiber communication system is increased.

Description

technical field [0001] The invention relates to optical amplification technology in the communication field, in particular to a joint amplification method and device of few-mode parameters and strong coupling Raman. Background technique [0002] With the rapid development of cloud computing, big data, Internet TV and other services, and the advent of the 5G era, the demand for transmission capacity, transmission rate, and transmission distance of optical fiber communication systems is getting higher and higher. In order to meet the needs of optical fiber communication systems, multiplexing technologies such as optical time division multiplexing, wavelength division multiplexing, polarization multiplexing, space division multiplexing, and dense wavelength division multiplexing have been continuously proposed and applied to the expansion of optical communication systems. However, for the long-distance optical fiber communication system of these technologies, the refraction and...

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Problems solved by technology

Among them, the gain of the erbium-doped fiber amplifier is not flat, the gain bandwidth is relatively narrow, and it can only amplify light with a wavelength of about 1550nm; the disadvantage of the fiber Raman amplifier is that the gain per unit length is relatively low; Phase matching in amplification is difficult and the gain spectrum is hump-shaped with a concave center and flat gain cannot be achieved

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