共查询到18条相似文献,搜索用时 625 毫秒
1.
提出了一种新型光模块消光比补偿方法。该方法首先根据不同温度下驱动芯片上报电流的大小,结合光功率和消光比的计算公式,模拟出激光器光功率随电流及电压的变化曲线。然后根据要求调整激光器调制电流的大小,以保持消光比的稳定。该补偿方式有效地解决了光器件一致性较差的问题,可以将原来斜效率的指标适当放宽10%,从而提高了利用率和成品率,降低了模块生产成本。 相似文献
2.
3.
4.
为了研究高速1550 nm微波光纤链路的高精度外调制特性,针对多量子阱分布反馈激光器的物理模型讨论了输出功率、阈值电流与温度的依赖关系,建立了相应的恒温恒功率控制电路,使激光器输出功率稳定在±0.005 dB以内,调制输出3 dB谱宽为0.5 nm,边模平坦,边模抑制比大于30 dB。另外设计了自动增益控制电路和附加相位调制电路,对外调制阶段的光功率进行控制。实验结果表明,采用1550 nm激光器及上述控制电路构成相应的外调制微波光纤链路系统,可有效地提高光发射模块输出光功率的稳定性,克服了直接调制带来的光谱展宽和消光比不稳定的缺点,实现了微波信号的高线性低失真传输。 相似文献
5.
6.
7.
从光电集成电路的角度出发,根据量子点半导体光放大器(QD-SOA)中载流子跃迁速率方程和光场传输方程,建立了QD-SOA等效电路模型,并通过电路仿真的方法对QD-SOA的增益谱、饱和增益特性等进行了仿真和分析;利用QD-SOA的交叉增益调制研究了速率分别为40Gbps、100Gbps和160Gbps时的波长转换特性,并分析了不同的偏置电流、功率的信号光和探测光对输出信号消光比和Q值的影响,其转换速率可达到100Gbps,消光比ER约为10dB,Q值约为2.2.该研究对提高基于QD-SOA的交叉增益调制波长转换的性能具有指导意义. 相似文献
8.
9.
10.
11.
12.
13.
Yosuke Tanaka Tatsutoshi Shioda Takashi Kurokawa Junji Oka Kazuyuki Ueta Toshiharu Fukuoka 《Optical Review》2009,16(3):257-261
We propose a novel power-line-monitoring system using optical fibers for transmitting power as well as signal. The principle
is experimentally confirmed with a system composed of a monitoring side with a 1.5-μm laser diode, transmission line of a
single mode fiber, and a sensing side having an efficient photovoltaic (PV) cell, electrical junction sensor, and low power
liquid crystal optical modulator (LCOM). The PV cell generates the electrical power in the sensing side with a conversion
efficiency of 20%. The LCOM is driven with low power of less than 50 μW, modulates the laser light with a signal indicating
the power line condition, and transmits the optical signal. The developed sensing unit produces an optical signal having an
extinction ratio of 15 dB with low optical power of 1.8 mW. Five systems were in operation for two years, faithfully monitoring
the oil pressure in electrical cables every 20 min without incident. 相似文献
14.
本文介绍了冰洲石晶体的性能检测试验,冰洲石偏振光棱镜的制造工艺,冰洲石偏振光棱镜消光比的检测以及冰洲石偏振光棱镜的部分性能检测试验。延边冰洲石晶体是属于光学质量很高的无色透明晶体,其化学成分纯净,双折射和偏振现象明显,光谱透过的范围为0.214~2.5μm,寻常光线的折射率为1.6589,非常光线的折射率为1.4869。用它制成有偏光棱镜,其性能良好。格兰·泰勒棱镜在电源电压950V,注入能量45J,40次/s的强功率激光作用下能连续工作20min,无自振现象,插入损耗小,透射率高。渥拉斯顿棱镜在PLDV型偏振差动式激光流速仪和LDV/LZF型二维多用激光流速仪上使用,其效果良好,波长为632.8nm时,其波振面畸变为λ/6-λ/8。格兰偏振棱镜的散射和吸收小于1%,消光比可达10 ̄(-5),可作为光学精密测量和高灵敏度探测等仪器中较理想的光学元件。 相似文献
15.
本文报导了一种测量光耦合效率η的新实验方法。这个方法是建立于p-n结短路光电流原理上的。本文推导出适合于行波激光放大器的光耦合效率的公式。短路光电流用一检流计测量,利用公式获得光耦合效率的实验值。利用实验所测光耦合效率,测量了行波激光放大器的增益随注入电流变化的规律,其结果和实验符合。另外本文还介绍了在脉冲注入电流条件下测行波半导体激光放大器增益的实验方法。 相似文献
16.
In this paper,we demonstrate an all-fiber linearly polarized fiber laser oscillator.The single polarization of the oscillator is achieved through the careful designing of the active fiber coiling.The relationship between fiber coiling diameter and polarization extinction ratio and optical efficiency is studied,whose results lead to an optimized system.The thermal management of the oscillator is also refined,which allows the oscillator to reach a maximum output power of44.1 W with an optical-to-optical efficiency of 57.9%.A high average polarization extinction ratio of 21.6 d B is achieved during a 2-hour stability test.The oscillator also owns a narrow 3-d B bandwidth of 0.1 nm,as well as near-diffraction-limit beam quality of M~2~ 1.14. 相似文献
17.
随着单管半导体激光器光纤耦合技术的不断发展,为了进一步提高多单管半导体激光器的输出功率,本文采用曲面空间排列方式对多个单管半导体激光器进行合束研究,使更多数量的单管半导体激光器耦合进入同一光纤中,获得更高的输出功率。文中利用ZEMAX光学设计软件进行仿真模拟,将34只波长为975 nm、输出功率为10 W的单管半导体激光器合束聚焦后耦合进芯径200 μm、数值孔径0.22的光纤中,获得耦合效率91.76%、输出功率312.03 W的激光系统。实验中,将17只单管半导体激光器耦合进芯径200 μm、数值孔径0.22的光纤中,在10.5 A的驱动电流下,输出功率为100.5 W,系统耦合效率为68.46%。 相似文献
18.
Dong Xue 《Optics Communications》2010,283(6):1059-1061
We present an all-fiber design for a single polarization Yb-doped fiber laser with all-fiber connections spliced. Single polarization with a high extinction ratio was achieved by the design of a laser cavity consisting of a fiber Bragg grating inscribed on a single-polarization fiber as a high reflective mirror and a piece of end-cleaved single-polarization fiber as an output coupler. The fiber laser operates at 1063.25 nm with an output power of 1.7 W, an optical signal- to-noise ratio of 70 dB and a narrow bandwidth of 54 pm. The laser output has a polarization extinction ratio of 700:1 or 28 dB, and a very stable power output. 相似文献