High Temperature Aging Research On Output Performance Of Erbium-Ytterbium Co-Doped Fiber Amplifier

Erbium-ytterbium co-doped fiber amplifier is an important device for amplifying optical signals in optical fiber communication systems.Its working wavelength is located in the 1550 nm band.It is a low-loss window for optical fiber communication.It has the advantages of high gain,broadband and low noise.The communication field has been widely used.However,as the working time increases,the performance of the fiber amplifier cannot be avoided,including the reduction of power and the increase of noise.In order to ensure the reliability of optical fiber amplifiers used in various systems,it is very necessary to be able to test or predict the service life of optical fiber devices in advance by means of manual intervention.Therefore,this article takes the commonly used erbium-ytterbium co-doped fiber amplifier in optical fiber communication as the test object,and takes high temperature as the accelerating stress,and conducts theoretical and experimental research on the output power and noise aging of this fiber amplifier.The main research contents of this paper are as follows:1.A model of the influence of temperature on the emission and absorption cross-sections of the gain fiber is proposed,and an exponential model of the scattering loss of the gain fiber with time is proposed.Combined with the above theoretical model,a method for predicting the service life of the fiber amplifier is proposed.2.According to the proposed theoretical model,the temperature characteristics and high temperature aging model of the erbium-ytterbium co-doped fiber amplifier are simulated by computer.The results show that the higher the temperature,the longer the optimal gain fiber length under a specific pump power.The longer fiber can obtain higher gain,but the damage time is relatively earlier.3.The output power of the erbium-ytterbium co-doped fiber amplifier was subjected to a 36.5-day aging experiment with temperature as the accelerated stress.The output power of the gain fiber with a length of 7.5 m is reduced to 0.616 W,which is 0.078 W lower than the 0.694 W before aging,that is,a 11.24%reduction,and is irreversible.The working life is 7.57 years,which is similar to the theoretical simulation result.4.The noise characteristics of the erbium-ytterbium co-doped fiber amplifier were subjected to an aging experiment with temperature as the accelerating stress,and the experimental measurements were carried out by spectroscopy and electrical spectroscopy respectively.After aging,the noise power spectral density of amplifiers with fiber lengths of 5 m,7.5 m,and 10 m increased by 52.26μV~2/Hz,77.18μV~2/Hz,and 95.42μV~2/Hz,respectively.Under long-term working conditions,the fiber length can reach the highest gain at an optimal value,but a longer length will also bring about the negative effects of higher thermal sensitivity and excessive noise power.Therefore,it is necessary to meet the requirements of gain Choose the shortest possible gain fiber,and strict thermal management is required to reduce the influence of noise on the transmission signal.