HIGH-EFFICIENCY DIRECT FREQUENCY MODULATION OF EXTERNAL-RESONATOR SEMICONDUCTOR LASER DIODE

外谐振半导体激光二极管的高效直接频率调制

• 批准号: 61550276
• 负责人: SHINOHARA Shigenobu
• 金额: $ 1.34万
• 依托单位: SHIZUOKA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550276/
• 关键词: EXTERNAL-RESONATOR SEMICONDUCTOR LASER; SYNCHRONOUS FM MODULATION; AUTOMATIC PHASE CONTROL; PHASE STABILIZATION; HIGH-EFFICIENCY MODULATION; 戻り光位相安定化; 半導体レーザ; 直接周波数変調; FM雑音; FM変調効率; 外部共振器

Described are a theory and experimental verification of improving the FM modulation efficiency together with the FM noise reduction of an external-resonator semiconductor laser diode (LD), by means of synchronously modulating LD drive current with phase of the returned light, reflected from the mirror comprising the external resonator.(1) Experiment on synchronous FM modulation with 110kHz sinusoidal wave : In case of modulation without automatic phase control(APC) for the returned light, FM noise has been reduced approximately proportioning to 1/(1+<xi>)^2 as feedback parameter <xi> is increased to 5, except for<xi> 1; the reduction reached 1/27 times the value of solitary LD. While modulation efficiency for the synchronous FM increased monotonously with increase of amplitude Lm of modulation of the external-resonator length L(=18cm). And when <DELTA>Lm =(<lambda>/2) (<DELTA>fm/fex), that increased to the value for solitary LD, 1.6 GHz/mA, which is (1+ <xi>) times conventional direct … More FM modulation efficiency. By further increase of the <DELTA>Lm, FM modulation efficiency increased as high as 13 GHz/mA, which is 8 times the value for solitary LD; where <lambda> is light wavelength, <DELTA>fm maximum frequency deviation for solitary LD modulated with sinusoidal current, and fex external resonator frequency. On the other hand,in case of synchronous modulation with APC, FM noise reduction was 2.4 dB, and FM modulation efficiency improvement 5 times, resulting 7.9 GHz/mA, when <xi> was set 0.8. Furthermore, by cooperating of the APC for 40 minutes, phase fluctuation of the returned light has been suppressed by about a twentieth to 14 degrees, which stabilized FM signal amplitude variation within 0.2 dB, and FM noise variation within 0.8 dB.(2) Experiment on synchronous FM modulation with 11 MHz sinusoidal wave: FM noise reduction and FM modulation efficiency improvement are also achieved by modulating phase of the returned light using LiNbO_3 optical phase modulator at 11 MHz. Less

描述了通过利用从包括外谐振器的反射镜反射的返回光的相位同步调制LD驱动电流来提高外谐振器半导体激光二极管（LD）的FM调制效率以及FM噪声降低的理论和实验验证。(1)110 kHz正弦波同步调频调制实验：在无自动相位控制（APC）的调制情况下，当反馈参数除1外，增加到5时，调频噪声约成1/（1+<xi>）^2<xi><xi>的比例降低，降低幅度达到单LD的1/27。而同步调频的调制效率随外腔长度L（= 18 cm）的调制幅度Lm的增加而单调增加。当<DELTA>Lm =（<lambda>/2）（<DELTA>fm/fex）时，增大到1.6GHz/mA，是常规直流的1<xi>+倍 ...更多信息 FM调制效率通过进一步增加<DELTA>Lm，FM调制效率增加高达13 GHz/mA，这是孤立LD值的8倍;其中<lambda>是光波长，<DELTA>FM最大频偏孤立LD调制正弦电流，和fex外部谐振器频率。另一方面，在使用APC的同步调制的情况下，FM噪声降低为2.4dB，并且FM调制效率提高了5倍，当设置为0.8时，结果为7.9GHz/mA<xi>。此外，通过APC的协作40分钟，返回光的相位波动被抑制了大约二十到14度，这将FM信号幅度变化稳定在0.2dB内，并且将FM噪声变化稳定在0.8dB内。(2)11 MHz正弦波同步调频调制实验：采用11 MHz铌酸锂光相位调制器对返回光进行相位调制，实现了调频噪声的降低和调频效率的提高。少

项目成果

SHIGENOBU SHINOHARA,MASATOSHI KANEMATSU,HIROFUMI YOSHIDA,AND MASAO SUMI: "HIGH-EFFICIENCY SYNCHRONOUS FM MODULATION OF EXTERNAL CAVITY SEMICONDUCTOR LASER DIODE" IEICE,TECHNICAL REPORT. CS87-97. 39-43 (1987)

SHIGENOBU Shinohara、Masatoshi KANEMATSU、HIROFUMI YOSHIDA 和 MASAO SUMI：“外腔半导体激光二极管的高效同步 FM 调制”IEICE，技术报告。