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A gain controllable two-segment erbium-doped optical fiber amplifier

A technology of erbium-doped fiber and amplifier, which is applied in the field of two-stage erbium-doped fiber amplifier, can solve the problems affecting the signal-to-noise ratio and noise of the output signal, and achieve the effect of improving the signal gain

Inactive Publication Date: 2008-07-09
FUDAN UNIV
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AI Technical Summary

Problems solved by technology

Due to the simultaneous existence of stimulated radiation and spontaneous radiation in the erbium-doped fiber amplifier, the spontaneous radiation is continuously amplified in the process of propagation, and it will become obvious noise when it reaches the output end, thus affecting the signal-to-noise ratio of the output signal

Method used

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  • A gain controllable two-segment erbium-doped optical fiber amplifier
  • A gain controllable two-segment erbium-doped optical fiber amplifier
  • A gain controllable two-segment erbium-doped optical fiber amplifier

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Embodiment Construction

[0038] First please refer to FIG. 1, which is a schematic structural diagram of a two-stage erbium-doped fiber amplifier with controllable gain of the present invention. As can be seen from the figure, the present invention sequentially includes a first optical isolator 1 from signal input to signal output, a first optical splitter 2, a first signal / pump wavelength division multiplexer 5, a first erbium-doped optical fiber 6, a signal / pump A pump wave division multiplexer 7, a second optical isolator 8, a second signal / pump wavelength division multiplexer 9, a second erbium-doped optical fiber 10, a third optical isolator 11, and a second optical splitter 13, wherein:

[0039] ① There are two sections of erbium-doped optical fibers 6 and 10 in the entire optical path, and there are sequentially connected signal / pump wave demultiplexer 7, second optical isolation device 8 and second signal / pump wave optical fiber between the two sections of erbium-doped optical fibers. The divi...

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Abstract

The invention belongs to the technical field of optical fiber amplifiers, which more particularly relates to a two-section erbium-doped optical fiber amplifier which has two sections and can control the gain. The optical fiber amplifier comprises a two-section erbium-doped optical fiber amplifying part and a gain control part, wherein the two-section erbium-doped optical fiber amplifying part comprises a 980mn pump laser source, a two-section erbium-doped optical fiber, an optical isolator, a signal and pump multiplexer, and a signal and pump demultiplexer; the gain control part comprises the signal input and output and the power measurement of output return light, as well as a controller of the pump laser device. The two-section optical circuit structure can effectively isolate an ASE noise in counterpropagation, thus optimizing the noise isolation performance of the amplifier. The gain control part can implement the gain control and optimization of the amplifier by monitoring the output power of the pump laser device.

Description

technical field [0001] The invention relates to an optical fiber amplifier, in particular to a two-stage erbium-doped optical fiber amplifier with controllable gain. Background technique [0002] With the continuous development of communication technology, broadband and high-speed communication are getting more and more attention from the society. Especially in the field of optical communication, its stable transmission and the huge potential bandwidth brought by DWDM (Dense Wavelength Division Multiplexing), broadband transmission has attracted more attention. Erbium-doped fiber amplifiers have undoubtedly played a vital role in all-optical communications since they were commercially available. After erbium is activated, it can fully amplify the digital signal and the analog signal light in the 1550nm window, and is transparent to the code type and rate. The 980nm optical pump laser can inject high-intensity energy into a special optical fiber to activate erbium ions and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/17H04B10/291
Inventor 王晖蒋凤仙
Owner FUDAN UNIV
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