Research On Dynamic Transfer Characteristics Of All-optical Regenerators

Long-distance transmission of optical fiber communication will cause signal degradation,and all-optical regeneration technology can flexibly realize optical signal regeneration.For signal degradation caused by amplified spontaneous emission?ASE?noise,the static and dynamic power transfer function?PTF?and Q factor transfer function?QTF?of the clock-pumped four-wave mixing?FWM?fiber regenerator are analyzed.The difference between the two focuses on the dynamic PTF and QTF characteristics of the all-optical regenerator.The main contents and innovations of this article are as follows:1.The effect of extinction ratio?ER?on the dynamic PTF curve was analyzed through simulation and experiment.The differences between static PTF and dynamic PTF saturation points were studied,and the relationship between static PTF and dynamic PTF was established using ER.Studies have shown that under a given fiber configuration,when the input signal ER is greater than 16 dBm,the static and dynamic P_in^sat are consistent,and at the same time,the static PTF can provide guidance for dynamic PTF.2.For the signal degradation caused by ASE noise,the difference between the dynamic PTF and the QTF of the clock pumped FWM fiber regenerator is analyzed.Studies have shown that under a given wavelength configuration and fiber parameters,the input optical power corresponding to the PTF output saturation point and the QTF optimal operating point differ by 1 d B,and is essentially independent of the pump power.This conclusion points out that the best operating point information can be obtained by measuring the dynamic PTF curve.3.An adaptive device based on a CLK-pump regenerator is proposed,which is composed of a bandwidth adjustable filtering unit,an automatic gain control?AGC?optical amplifying unit,a signal processing/control unit and a light shaping unit.The operating state of the all-optical regenerator depends mainly on the threshold of the optical decision or the optimum operating point of the non-linear unit,and the matching of the input degraded signal characteristics with the optimum operating point is crucial.The device can automatically adjust to the optimal working state according to the deterioration characteristic of the ASE noise in the input signal,and has the advantage of plug and play in the optical network.4.We propose a method to optimize the all-optical regenerators.By building an all-optical regeneration system,the optoelectronic conversion function of the optical receiver is utilized and QTF curves are used to optimize the design of the all-optical 2R regenerator and make it work in the best state.Studies have shown that when the wavelength setting and fiber parameters of the all-optical regenerator are determined,the Q value boost performance is closely related to the pump power,the input signal power,and the input degraded signal Q value.When the input degraded signal Q is13.19dB,the clock-pumped fiber regenerator is capable of improving the Q-factor and receiver sensitivity for 40Gb/s ASE-degraded RZ-OOK signale by 2.58dB and4.2dB,respectively.