激光杂志
激光雜誌
격광잡지
LASER JOURNAL
2014年
11期
57-59
,共3页
FPGA%压控恒流源%QuartusII%仿真
FPGA%壓控恆流源%QuartusII%倣真
FPGA%압공항류원%QuartusII%방진
FPGA%Voltage-controlled constant current circuit%QuartusII%simulation
为了提高DFB激光器驱动电路的可靠性和稳定性，设计了一款基于波长调制光谱技术的DFB激光器驱动电路。压控恒流源电路能够完成对激光器的恒流驱动以及其波长的粗调。利用FPGA生成直接频率合成器产生幅值为5V，频率为20kHz的正弦信号和频率为20Hz的三角信号，其可以对激光器的波长进行调制和扫描，进而实现对激光器的波长进行精确调谐。然后利用QuartusII软件对激光器的驱动电路进行了仿真。最后，对激光器驱动电路进行了模拟实验，结果表明输出电流与输入电压成线性关系，输出的电流与负载无关，达到了预期的设计目标。
為瞭提高DFB激光器驅動電路的可靠性和穩定性，設計瞭一款基于波長調製光譜技術的DFB激光器驅動電路。壓控恆流源電路能夠完成對激光器的恆流驅動以及其波長的粗調。利用FPGA生成直接頻率閤成器產生幅值為5V，頻率為20kHz的正絃信號和頻率為20Hz的三角信號，其可以對激光器的波長進行調製和掃描，進而實現對激光器的波長進行精確調諧。然後利用QuartusII軟件對激光器的驅動電路進行瞭倣真。最後，對激光器驅動電路進行瞭模擬實驗，結果錶明輸齣電流與輸入電壓成線性關繫，輸齣的電流與負載無關，達到瞭預期的設計目標。
위료제고DFB격광기구동전로적가고성화은정성，설계료일관기우파장조제광보기술적DFB격광기구동전로。압공항류원전로능구완성대격광기적항류구동이급기파장적조조。이용FPGA생성직접빈솔합성기산생폭치위5V，빈솔위20kHz적정현신호화빈솔위20Hz적삼각신호，기가이대격광기적파장진행조제화소묘，진이실현대격광기적파장진행정학조해。연후이용QuartusII연건대격광기적구동전로진행료방진。최후，대격광기구동전로진행료모의실험，결과표명수출전류여수입전압성선성관계，수출적전류여부재무관，체도료예기적설계목표。
In order to improve the reliability and stability of LD driving circuit, this paper designes LD driving circuit based on the wavelength modulation spectroscopy technique. In this paper, the voltage controlled constant cur-rent source circuit designed can complete the current driving for the LD, and then realize the precise tuning for the wavelength of the laser. At the same time, DDS generated by using FPGA can get 20kHz sine wave and 20Hz trian-gular signal with 5V, which can complete wavelength modulation and wavelength scanning of the laser. In this paper, we use QuartusII software simulate LD driving circuit, and then we carry out simulation experiment. The result shows that the output current of LD driving circuit is linear with the input voltage, and it is nothing to the load. So this paper achieves the desired design goals, and will provide an important reference in the further.
