Mixed discrete-type high-nonlinearity optical fiber amplifier based on double-feedback structure

Abstract

The invention discloses a mixed discrete-type high-nonlinearity optical fiber amplifier based on a double-feedback structure, and the amplifier comprises a plurality of light transmitters, a laser, an optical signal combiner, an Er-doped fiber, an optical signal divider, a plurality of light receivers, a first isolator, a second isolator, a first coupler, a second coupler, a first circulator, a second circulator, a polarized wave combiner, a control unit, a high-nonlinearity optical fiber, a fiber bragg grating, and a plurality of groups of pump light. A feedback ring structure is formed between the first circulator and the first coupler, and a feedback ring structure is formed between the second circulator and the first and second couplers. The first isolator is connected between the optical signal combiner and the first coupler, and the second isolator is connected between the fiber bragg grating and the optical signal divider. The amplifier is advantageous in that the utilization rate of pump power is high, the mutual interference between the pump light and signal light at front and back stages is small, the control effect is good, the raman gain coefficient is high, the integration degree is higher, and the small-scale design is facilitated better.

Description

Technical field: [0001] The invention relates to an optical fiber amplifier, in particular to a hybrid discrete high nonlinear optical fiber amplifier based on a double feedback structure. Background technique: [0002] In the optical communication system, due to the attenuation of the optical signal during transmission, optical dispersion, changes in the optical sensitivity of the system, and various losses introduced by various optical components, the optical signal cannot be correctly detected at the receiving end, so The optical signal must be restored. The traditional optical-electrical-optical relay method requires complex signal processing such as amplification and reshaping in the electrical domain before transmission, and this transmission method has complex devices, high cost, and low transmission quality. [0003] The fiber amplifier replaces the traditional optical-electrical-optical relay mode, and realizes the simultaneous amplification of multiple optical sig...

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Problems solved by technology

Moreover, when no explanation is generally made, the Raman amplifier is distributed amplification, which means that the length of the nonlinear fiber is about 10 kilometers. In this way, the pump light power attenuates more severely, so the utilization rate of the pump light power is not high

[0008] 2. Due to the mutual interference between the pump light and the mutual interference between the pump light and the signal light, it will affect the control effect of the fiber amplifier

[0009] 3. The fiber type of the Raman fiber amplifier is not marked, nor is the specific type of fiber indicated

The ordinary single-mode fiber generally used in Raman fiber amplifier is G.652, but its Raman gain coefficient is very small, the amplification is not obvious, and it cannot meet the requirements of wavelength division multiplexing system

If you encounter problems such as system noise again, the signal-to-noise ratio will be sharply attenuated

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