公开(公告)号：US4859018A

公开(公告)日：1989-08-22

申请号：US61625

申请日：1987-06-15

申请人： Maurice S. O'Sullivan ,  Hyung B. Kim ,  Vincent C. So ,  Paul J. Vella

发明人： Maurice S. O'Sullivan ,  Hyung B. Kim ,  Vincent C. So ,  Paul J. Vella

IPC分类号： G02B6/28 ,  H04B10/18

CPC分类号： H04B10/2507 ,  G02B6/2861

摘要： A bandwidth limiter for an optical fiber transmission path comprises a four-port optical coupler via which an optical signal is passed. A spliced optical fiber provides a loop, from an output to an input of the coupler, with a predetermined propagation delay and attenuation. An alternative arrangement uses two couplers which are coupled together via fibers of different length and hence propagation delay.

摘要翻译： 用于光纤传输路径的带宽限制器包括通过光信号的四端口光耦合器。 拼接的光纤以预定的传播延迟和衰减提供从耦合器的输出到输入的环路。 一种替代方案是使用两个耦合器，它们通过不同长度的光纤和传播延迟耦合在一起。

公开(公告)号：US5815308A

公开(公告)日：1998-09-29

申请号：US650536

申请日：1996-05-20

申请人： Hyung B. Kim ,  Farideh Khaleghi ,  Jinghui Li ,  Mohsen Kavehrad

发明人： Hyung B. Kim ,  Farideh Khaleghi ,  Jinghui Li ,  Mohsen Kavehrad

IPC分类号： H01S3/067 ,  H01S3/10 ,  H01S3/16 ,  H04B10/17 ,  H01J5/16 ,  H01S3/103 ,  H04B9/00

CPC分类号： H04B10/2971 ,  H01S3/10023 ,  H04B10/2912 ,  H01S3/06787 ,  H01S3/1003 ,  H01S3/1608

摘要： Bidirectional WDM transmission at 2.5 Gb/s using a bidirectional erbium-doped fiber amplifier (EDFA) is demonstrated over a distance of 300 km. A symmetrical EDFA configuration with a frequency tunable reflection attenuator is used as a bidirectional amplifier. Experimental results show that the allowable gain of the EDFA can be increased significantly while the associated bit error rate BER penalty remains negligible.

摘要翻译： 使用双向掺铒光纤放大器（EDFA），2.5 Gb / s的双向WDM传输在300公里的距离内展现。 具有频率可调谐反射衰减器的对称EDFA配置被用作双向放大器。 实验结果表明，EDFA的容许增益可以显着提高，相关的误码率BER值仍然可以忽略不计。

公开(公告)号：US06519270B1

公开(公告)日：2003-02-11

申请号：US09409036

申请日：1999-09-29

申请人： Hyung B. Kim ,  Jin J. Hong

发明人： Hyung B. Kim ,  Jin J. Hong

IPC分类号： H01S310

CPC分类号： H01S5/06258 ,  H01S5/1021 ,  H01S5/1228

摘要： The invention relates to compound cavity optical reflection modulation laser system providing frequency modulation of laser light by phase induced effective reflection modulation of the laser rear facet. The system includes a single mode gain coupled DFB laser integrated with a passive waveguide section to form a compound cavity modulation system. The waveguide includes a multiple quantum well region which is reverse biased to utilize the quantum Stark effect for voltage controlled refractive index modulation, thus providing phase modulation of the laser light. The phase modulated light is fed back to the laser to interfere with the light generated within the laser and to form the output light generated from the compound cavity. The interference effects cause modulation of the effective complex reflection of the rear laser facet which results in frequency modulation of the output light. If required, the frequency modulated light (FM) may be converted into intensity modulated (IM) light by using an additional narrow band optical filter, e.g. Mach-Zehnder interferometer.

摘要翻译： 本发明涉及通过激光后面的相位诱导有效反射调制来提供激光的频率调制的复合腔光反射调制激光系统。 该系统包括与无源波导部分集成的单模增益耦合DFB激光器，以形成复合腔调制系统。 波导包括多量子阱区域，其被反向偏置以利用用于压控折射率调制的量子斯塔克效应，从而提供激光的相位调制。 相位调制光被反馈到激光器以干扰在激光器内产生的光并形成从复合腔产生的输出光。 干扰效应导致后激光小面的有效复反射的调制，这导致输出光的频率调制。 如果需要，调频光（FM）可以通过使用附加的窄带滤光器（例如， 马赫 - 曾德干涉仪。

公开(公告)号：US5825792A

公开(公告)日：1998-10-20

申请号：US680284

申请日：1996-07-11

申请人： Bernard Villeneuve ,  Hyung B. Kim

发明人： Bernard Villeneuve ,  Hyung B. Kim

IPC分类号： H04J14/00 ,  H01S3/137 ,  H01S3/139 ,  H01S5/068 ,  H01S5/0687 ,  H04B10/04 ,  H04B10/06 ,  H04B10/08 ,  H04B10/14 ,  H04J14/02 ,  H01S3/13

CPC分类号： H01S3/139 ,  H01S3/137 ,  H01S5/0687

摘要： A compact wavelength monitoring and control assembly for a laser emission source is provided comprising a narrow bandpass, wavelength selective transmission filter element, of Fabry-Perot etalon structure, through which a non-collimated beam from the laser source is directed onto two closely spaced photodetectors. For wavelength stabilization, the differential output of the two photodetectors is used in a feedback loop to stabilize the wavelength of the laser source to a desired target wavelength. Through the angular dependence of the wavelength transmission of the Fabry-Perot etalon, a wavelength variation from the source is converted to a transmission loss, which is different for the two photodetectors, so that the wavelength change is detected as a differential power change. The device functions as an optical wavelength discriminator in which the detector converts optical energy to current for a feedback loop for controlling the light source. A lens may be used to control the divergence of the light incident on the filter element to optimize power transfer. Optionally, wavelength tunability is provided by changing the angle of inclination of the Fabry-Perot etalon relative to the laser source. The system is compact and may be co-packaged within the same package as a laser emission source, overcoming coupling, space and power dissipation problems common with known external semiconductor laser wavelength control units.

摘要翻译： 提供了一种用于激光发射源的紧凑型波长监视和控制组件，其包括法布里 - 珀罗标准具结构的窄带通波长选择性透射滤光元件，来自激光源的非准直束通过该光束被引导到两个紧密间隔的光电探测器 。 对于波长稳定，两个光电检测器的差分输出用于反馈环路中，以将激光源的波长稳定到期望的目标波长。 通过法布里 - 珀罗标准具的波长传输的角度依赖性，来自源极的波长变化被转换为对于两个光电检测器不同的传输损耗，使得波长变化被检测为差分功率变化。 该器件用作光学波长鉴别器，其中检测器将光能量转换成用于控制光源的反馈回路的电流。 可以使用透镜来控制入射在滤光元件上的光的发散，以优化功率传递。 可选地，通过改变法布里 - 珀罗标准具相对于激光源的倾斜角来提供波长可调性。 该系统紧凑，并且可以与激光发射源在同一封装内共同封装，克服了已知的外部半导体激光器波长控制单元所共有的耦合，空间和功耗问题。

公开(公告)号：US6104739A

公开(公告)日：2000-08-15

申请号：US998071

申请日：1997-12-24

申请人： Jin Hong ,  Hyung B. Kim ,  Toshihiko Makino

发明人： Jin Hong ,  Hyung B. Kim ,  Toshihiko Makino

IPC分类号： H01S5/00 ,  H01S5/026 ,  H01S5/04 ,  H01S5/06 ,  H01S5/0625 ,  H01S5/12 ,  H01S5/22 ,  H01S5/40 ,  H01S3/19 ,  H01S3/08

CPC分类号： H01S5/06258 ,  H01S5/1228 ,  H01S5/4025 ,  H01S5/026 ,  H01S5/041 ,  H01S5/0612 ,  H01S5/1215 ,  H01S5/22 ,  H01S5/4031 ,  H01S5/4087

摘要： A one dimensional series of complex coupled (gain or loss coupled) DFB semiconductor lasers is disclosed. Each laser comprises a multiple quantum well active region and a complex coupled grating having corrugations along a cavity length direction formed by periodically etching grooves through the active region. The grating has a period comprising a first section and a second section, wherein substantially all quantum wells are etched away from the second section providing no substantial photon generation in the second section. The depth of etching is defined so as to provide a substantial insensitivity of each laser to the external feedback and random facet variations and to ensure no substantial interaction between lasers in the series. The lasers in the series may further comprise means for tuning laser wavelengths around corresponding lasing modes and/or means for switching between the lasing modes. The series of lasers is also capable of simultaneous multi-wavelength generation, with the number of generated wavelengths being equal to a number of lasers in the series excited above threshold levels.

摘要翻译： 公开了一种复合耦合（增益或损耗耦合）DFB半导体激光器系列。 每个激光器包括多量子阱有源区域和复合耦合光栅，其具有沿着通过周期性蚀刻通过有源区域的沟槽形成的空腔长度方向的波纹。 光栅具有包括第一部分和第二部分的周期，其中基本上所有的量子阱从第二部分被蚀刻掉，从而在第二部分中不产生实质的光子产生。 蚀刻深度被定义为使得每个激光器对外部反馈和随机小面变化的实质性不敏感性并且确保该系列中的激光器之间没有实质的相互作用。 该系列中的激光器还可以包括用于调整激光波长在相应的激光模式周围的装置和/或在激光模式之间切换的装置。 该系列激光器还能够同时进行多波长生成，其中生成的波长的数量等于在阈值水平以上激发的系列中的激光器的数量。

公开(公告)号：US5936994A

公开(公告)日：1999-08-10

申请号：US933529

申请日：1997-09-18

申请人： Jin Hong ,  Hyung B. Kim ,  Toshi Makino

发明人： Jin Hong ,  Hyung B. Kim ,  Toshi Makino

IPC分类号： H01S5/00 ,  H01S5/0625 ,  H01S5/065 ,  H01S5/12 ,  H01S3/08 ,  H01S3/10

CPC分类号： H01S5/06258 ,  H01S5/1228

摘要： A complex coupled (gain coupled or loss coupled) distributed feedback (DFB) semiconductor laser, having two sections axially distinct along a cavity length direction, and two excitation means for independent pumping of corresponding sections of the laser in a master and slave type of pumping control, is provided. An extended continuous wavelength tuning range of the laser is obtained by selectively activating a left Bragg mode or a right Bragg mode across the stop band of the laser as a dominant lasing mode by the master and slave type of current injection control into different sections of the laser to alternate gain coupling and loss coupling mechanisms of laser operation, and further tuning a wavelength around the activated Bragg mode. Methods of operating the laser, enhancing a tuning range, and fabricating thereof are provided.

摘要翻译： 分布式反馈（DFB）半导体激光器，具有沿着腔长度方向轴向不同的两个部分的复耦合（增益耦合或损耗耦合）半导体激光器，以及两个激励装置，用于独立地泵浦主和从属类型的泵浦中的相应激光部分 控制。 激光器的延长的连续波长调谐范围通过主动和从属类型的电流注入控制选择性地激活激光器的阻带上的左布拉格模式或右布拉格模式作为主要的激光模式， 激光器交替增益耦合和损耗耦合机制的激光操作，并进一步调整激活的布拉格模式附近的波长。 提供操作激光的方法，增强调谐范围及其制造方法。