Erbium-doped fiber amplifier

Abstract

The invention discloses an erbium-doped fiber amplifier. The erbium-doped fiber amplifier comprises an amplifying medium, pumping sources, an optical power detecting diode, a pure optical component and a chromatic dispersion compensating module, wherein the amplifying medium comprises a first erbium-doped fiber and a second erbium-doped fiber; the pure optical component comprises an isolator, an optical splitter, a first multiplexer and a second multiplexer; the pumping sources comprise a first pumping source and a second pumping source; the front end of the first erbium-doped fiber is connected with the first multiplexer of the first pumping source; the rear end of the first erbium-doped fiber is connected with the isolator and then connected with one end of the chromatic dispersion compensating module; the other end of the chromatic dispersion compensating module is connected with the second multiplexer of the second pumping source; and the second multiplexer is connected with the second erbium-doped fiber. The invention provides the two-stage forward 980nm pumping EDFA (Erbium-doped Fiber Amplifier) with a chromatic dispersion compensating module inside; the EDFA not only can improve the amplifier NF (Noise Frequency) value brought by single-stage optical fiber and 1480nm pumping design, but also can be internally provided with the chromatic dispersion compensating module, thereby achieving extremely high practicability and adaptability.

Description

technical field [0001] The invention relates to an erbium-doped optical fiber amplifier, in particular to an erbium-doped optical fiber amplifier with dual forward 980nm pumps and a built-in dispersion compensation function. Background technique [0002] At present, the well-known erbium-doped fiber amplifier (EDFA) in the cable TV industry is a single-stage erbium-doped fiber amplifier designed to use bidirectional pumping at 980nm forward and 1480nm backward; the dispersion compensation device uses an independent dispersion compensation fiber device. Although the 1480nm pump laser is connected to the system in a backward way to reduce the noise introduced by itself, the noise reduction ability of the backward PUMP mode is still inferior to that of the forward 980nm pump mode. Independent dispersion compensation optical fiber equipment, no matter the principle of negative dispersion compensation or adjustable modules, will increase the system contact loss, increase the powe...

AI Technical Summary

Problems solved by technology

Although the 1480nm pump laser is connected to the system in a backward way to reduce the noise introduced by itself, the noise reduction ability of the backward PUMP method is still not as good as that of the forward 980nm pumping method

Independent dispersion compensation optical fiber equipment, no matter the principle of negative dispersion compensation or adjustable modules, will increase the system contact loss, increase the power consumption, increase the number of system equipment, increase the system noise, and affect the comprehensive performance and management and maintenance of the system.

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