A hybrid multimode amplifier based on mm-edfa and its realization method

Abstract

The invention relates to a mixed multimode amplifier based on a multimode erbium-doped fiber amplifier (MM-EDFA) and an implementation method of the mixed multimode amplifier. The mixed multimode amplifier comprises a first division multiplexing device, an erbium-doped amplifying device, a second division multiplexing device and a gain equalization device, wherein the first division multiplexing device multiplexes input signals to different transmission paths according to a specific mode group for transmission; the erbium-doped amplifying device is connected with the first division multiplexing device, and comprises MM-EDFAs and variable optical attenuators, each MM-EDFA and the corresponding variable optical attenuator are mutually connected into one path, and the multiple paths of the MM-EDFAs and the variable optical attenuators are arranged parallelly; the second division multiplexing device is connected with the erbium-doped amplifying device to multiplex multipath signals to onepath; and the gain equalization device is connected with the second division multiplexing device for gain flattening of the signals in the wavelength range. Compared with the prior art, different modegroup signals are correspondingly subjected to gain adjustment by the mixed multimode amplifier, the inter-mode gain is effectively reduced, the amplifying performance of the EDFAs is improved, thenthe signal gain is adjusted within the wavelength range through multimode fiber raman amplifiers (MFRAs), gain flattening is achieved, and the mixed multimode amplifier is convenient, fast and easy tooperate.

Description

technical field [0001] The invention relates to a hybrid multimode amplifier, in particular to an MM-EDFA based hybrid multimode amplifier and its realization. Background technique [0002] Erbium-Doped Fiber Amplifier (EDFA) uses pump light to amplify signal light, making long-distance, large-capacity, and high-speed optical fiber communication possible. It is a revolutionary breakthrough in the field of optical fiber communication technology. The Raman Fiber Amplifier (RFA) works by using the third-order nonlinear effect when the strong laser is transmitted in the fiber - the stimulated Raman scattering effect (SRS: Stimulated Raman Scattering), which overcomes the EDFA Limitations on working band and bandwidth. However, although the above optical fiber amplifiers have been widely used in single-mode optical fibers, the technology in multi-mode optical fibers is still immature. With the further increase of people's communication needs and the capacity of communication sy...

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Problems solved by technology

However, the article only analyzes the performance of multi-mode amplification for a single wavelength signal, and does not analyze the wavelength-dependent gain. The realization in the wavelength division multiplexing (Wavelength Division Multiplexing, WDM) system needs further research.

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