L wave band bilateral backward pump erbium-doped optical fiber amplifier

Abstract

The present invention relates to a double-way backward pumped L-band erbium-doped optical fiber amplifier, and belongs to the optical communication technical field comprises a tunable laser, an optical circulator, a 980 / L-band-wavelength selecting coupler, an erbium-doped optical fiber, a pumped laser, a reflecting mirror of optical fiber ring and a optical spectrum analyzer, and are connected in the relationship that the optical circulator has three ports, one of the three ports is connected with the tunable laser, another one of the three ports is connected with one end of the erbium-doped optical fiber, the third port of the optical circulator is connected with the optical spectrum analyzer; and the other end of the erbium-doped optical fiber is connected with the public port of the 980 / L-band-wavelength selecting coupler; the 980nm port of the 980 / L-band-wavelength selecting coupler is connected with the pumped laser; the 1550 port of the 980 / L-band-wavelength selecting coupler is connected with the a reflecting mirror of optical fiber ring. The present invention can use lower pump power to achieve higher small-signal gain and low noise index.

Description

Technical field [0001] The invention relates to a device in the field of optical communication technology, in particular to an L-band double-pass backward pumped erbium-doped fiber amplifier. Background technique [0002] With the accelerated growth of Internet data transmission bandwidth requirements, the traditional C-band (1530nm-1565nm) erbium-doped fiber amplifier (EDFA) can no longer meet the requirements. With the widespread application of dense wavelength division multiplexing systems (DWDM), the use of L-band (1565nm-1610nm) in the system has become more and more important. L-band EDFA has inherent gain flatness. However, because the operating wavelength is far from the radiation peak of erbium ions, the pumping efficiency of the L-band erbium-doped fiber amplifier (EDFA) gain is quite low. Although there are some technologies that can effectively increase the gain of the L-band signal, they have little effect in practical applications due to higher cost or poor noise fi...

AI Technical Summary

Problems solved by technology

However, since the operating wavelength is far away from the radiation peak of erbium ions, the pumping efficiency of the L-band erbium-doped fiber amplifier (EDFA) gain is quite low

Although some technologies can effectively improve the signal gain of the L-band, they are not very effective in practical applications due to high cost or poor noise figure.

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