Method and device for acquiring equivalent 0km joint loss of fiber node in Raman optical fiber amplifier

Abstract

The invention relates to the technical field of optical communications, and provides a method and a device for acquiring an equivalent 0km joint loss of a fiber node in a Raman fiber amplifier, wherein the method comprises the following steps of obtaining a pumping transmission power, a signal transmission power relationship, and an out-of-band ASE power relationship; dividing the optical fiber into one or two segments according to the position of the joint loss set in an optical fiber line; respectively, using formula as a weighted value and solving to obtain an out-of-band ASE power value; introducing the out-of-band ASE power value to the relational expression between the out-of-band ASE power and the equivalent 0km joint loss, and obtaining the equivalent 0km joint loss. The inventionprovides a method for acquiring equivalent 0km joint loss of fiber node in Raman optical fiber amplifier, so that the 0km equivalent joint loss value obtained by calculating the obtained distance equivalence of the joint to the pumping source can be used via the process of calculating the actual maximum gain.

Description

【Technical field】 [0001] The invention relates to the field of optical communication devices, in particular to a method and device for obtaining the equivalent 0km joint loss of an optical fiber node in a Raman optical fiber amplifier. 【Background technique】 [0002] Raman fiber amplifier is an important part of high-speed, long-distance fiber optic communication system. With the establishment of "Internet +" as a national strategy, the development of mobile Internet, cloud computing, big data, and the Internet of Things has put forward higher requirements for the bandwidth and speed of existing communication networks, which restricts high-speed, ultra-long-distance communications. The main factor for the large-scale application of the system is the Optical Signal Noise Ratio (OSNR for short). The Raman fiber amplifier has unique advantages in improving the OSNR of the system, and its low noise figure can significantly reduce the optical signal noise ratio in the optical fib...

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Problems solved by technology

[0003] Chinese patent CN201110174019.4 describes a method of using out-of-band ASE for gain control, and discloses the linear relationship between out-of-band amplified spontaneous emission (Amplified Spontaneous Emission, abbreviated as: ASE) and gain, and at the same time announces the , the relationship to the ASE correction, but this control method is still easily affected by the performance of the transmission line, the transmission line performance includes such as the length of the optical fiber transmitted, the loss coefficient of the optical fiber, and the splice loss in the transmission line

[0005] Chinese patent CN201210235491.9 describes a method for calculating splice loss using out-of-band ASE power. This method has been applied to a certain extent, but this method cannot distinguish between fiber loss coefficient, mode field diameter or fiber effective area and fixed attenuation The total splice loss value pointloss caused by the point

In this method, the optical time domain reflectometer (OTDR) is used to detect the fiber loss in real time, which will be greatly affected by the Raman gain, and the method of calculating the Raman gain coefficient also needs to solve the differential equation. Data processing has high requirements on the control unit. Because the calculation process is too complicated, the time will be very slow. The built-in table is greatly affected by environmental factors. It is necessary to create a huge table to adapt to all situations, and the hardware cost is high.

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