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

所描述的是提高FM调制效率的理论和实验验证，以及通过同步调节LD驱动器与返回光的相位调节的LD驱动电流的外部谐振器半导体激光二极管（LD）的FM噪声降低，从镜像中反射为镜子，从镜像中反射为外部复合器。返回光的自动相位控制（APC），FM噪声已大约比例为1/（1+ <xi>）^2作为反馈参数<xi>增加到5，除了<xi> 1；降低达到固体LD值的1/27倍。尽管同步FM的调制效率随着外部谐振器长度L（= 18cm）的调节的放大器LM的增加而单调增加（= 18cm）。当<delta> lm =（<lambda>/2）（<delta> fm/fex），将固体LD的值增加到1.6 GHz/ma的值，即（1+ <xi>）常规直接…更高的FM调制效率。通过进一步增加<delta> lm，FM调制效率高达13 GHz/mA，这是固体LD值的8倍；其中<lambda>是光波长，<delta> fm用正弦电流调制的固体LD的最大频率偏差和FEX外部谐振器频率。另一方面，如果与APC同步调制，FM降噪为2.4 dB，而FM调制效率提高了5次，则为7.9 GHz/ma，当设置为0.8时。此外，通过将APC合作40分钟，返回光的相位波动已被约20至14度抑制，从而稳定了0.2 dB内的FM信号放大器的变化，FM噪声变化在0.8 dB中。（2）对11 MHz Sinusioid sinusioid sinusioid Waver的效率（2）实验。使用LINBO_3光相调制器在11 MHz处调节返回光的阶段。较少的

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。