Weak light remote pump amplifier based on double 1480nm laser

Abstract

The invention provides a weak light remote pump amplifier based on double 1480nm laser. The weak light remote pump amplifier comprises an optical transmitter, a power amplifier, an optical receiver and a transmission optical fiber. The optical transmitter transmits an optical signal which enters the transmission optical fiber of 75-100km through the power amplifier to be transmitted to an application facility of which the loss is less than or equal to 30dB. Then the weak optical signal outputted by the application facility firstly enters a passive remote pump amplifier and then is transmitted to the optical receiver through the optical signal transmission optical fiber of 75-100km and the optical amplifier. The passive remote pump amplifier is connected with two 1480nm laser acting as pump sources through two pump transmission optical fibers of 75-100km. The suitable weak optical signal power can be lower to -38dBm, and the signal-to-noise ratio of the optical signal reaching the receiver can be 16dB so that the signal-to-noise ratio requirement of the preamplifier can be met, the relative intensity noise can be -100dB and the requirement of the demodulation technology can be met; and implementation and application are easy.

Description

technical field [0001] The invention relates to an optical fiber amplification technology, in particular to a weak light remote pump amplifier based on double 1480nm lasers used in a weak signal amplification system without repeaters. Background technique [0002] In the weak optical signal system, the optical signal is often lower than -30dBm, or even reaches -40dBm, which is generally solved by using active optical amplification. The environment of this kind of weak optical signal system is generally more complicated, and requires a long service life, but some occasions are not suitable for active solutions, and there is a lack of effective amplification means. At present, the implementation scheme of the general weak optical amplifier is complex, requires many technologies to compensate and has low reliability. At present, a preamplifier is often used at the input of the receiver to amplify the weak optical signal, but the optical signal-to-noise ratio of this method can...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the complex and low reliability shortcomings of the existing weak optical signal amplification system, the purpose of the present invention is to provide a weak optical remote pump amplifier based on dual 1480nm lasers. The amplifier is used as the pump light, and the remote pump amplifier has a higher gain and a higher signal-to-noise ratio

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