Research And Application Of Pump Laser-Driven Source In Erbium-Doped Fiber Amplifer

EDFA optical communication system as a new generation of key components, optical fiber communication and transmission technology to bring about a revolution. EDFA is its most critical work, the stability of the gain characteristics of these features play a decisive role in the EDFA pump laser is whether the stability of the output, which requires the selection of the drive circuit when the pump laser, to select Strong stability of the circuit.In this paper, the characteristics of EDFA's demand for driver circuit structure and performance of research and design, research focused pump laser current source circuit as the driver of the improved design, while achieving the EDFA-based FPGA hardware design. The paper is divided into the following four areas:First, the introduction of the current development of optical fiber communications, erbium-doped fiber amplifier domestic research situation, erbium-doped fiber amplifier in optical fiber communication in the role and status of the contents of this paper and the tasks undertaken.Second, the composition of the framework introduced EDFA, EDFA's operating principle and structure of the composition, which includes optical parts and circuit parts, outlines the composition EDFA's optical structure and circuit structures.And third, build the EDFA pump laser driver circuit in the overall circuit structure, the pump laser driver circuit structure has the following components: slow-start circuit, the ripple regulator circuit, over-current protection circuit, power anti-shock circuit , constant current source circuit, optical detection circuit, temperature control circuit, which focuses on the constant current source circuit as the pump laser drive improved design, drawn in Pspice environment, drive circuit, and the DC circuit designed scan transient, temperature and noise analysis to verify the accuracy and feasibility of the circuit design, the theoretical calculation and simulation to compare the results obtained in this design the circuit to further improve the driving stability of the circuit, so that the pump laser be more stable output, the simulation results and theoretical analysis is consistent.Finally, the research design of the pump laser driver circuit used in FPGA-based automatic gain control EDFA with, the use of FPGA to handle complex timing and convenient features, combined with PID algorithm, making the circuit has a simple, scalable, highly reliable easy to achieve such characteristics, the pump laser driver circuit on FPGA hardware design, increase the reliability of the whole system, so that drive power with high intelligence, anti-interference ability, high precision temperature control, high power stability on the laser without damage and so on.