公开(公告)号：US5052015A

公开(公告)日：1991-09-24

申请号：US581870

申请日：1990-09-13

申请人： David A. Ackerman ,  Philip J. Anthony ,  Leonard J.-P. Ketelsen ,  Venkataraman Swaminathan

发明人： David A. Ackerman ,  Philip J. Anthony ,  Leonard J.-P. Ketelsen ,  Venkataraman Swaminathan

IPC分类号： H01S5/00 ,  H01S5/10 ,  H01S5/12

CPC分类号： H01S5/10 ,  H01S5/12 ,  H01S5/1243

摘要： A semiconductor distributed feedback laser having a grating with .lambda./4 phase shift which is produced by moving the left and right sections of the grating with respect to each other in a direction perpendicular to the longitudinal axis of the active region.

公开(公告)号：US5319666A

公开(公告)日：1994-06-07

申请号：US43916

申请日：1993-04-07

申请人： David A. Ackerman

发明人： David A. Ackerman

IPC分类号： G02B5/18 ,  H01S5/00 ,  H01S5/12 ,  H01S3/08

CPC分类号： H01S5/12

摘要： In some applications of distributed feedback (DFB) lasers, it is important that the coupling constant .kappa. be closely controlled. This is not easily achieved, frequently resulting in low yield of acceptable devices. I have discovered that variations in .kappa. can be reduced if the DFB laser is designed such that the thickness t.sub.s of a spacer layer (between the active layer and the Bragg grating) is within about .+-.10% of the value t.sub.o /(1-.alpha.), where t.sub.o is the modal decay length, and .alpha. is a parameter which characterizes the fractional variation of t.sub.o with fractional changes in layer thickness.

摘要翻译： 在分布式反馈（DFB）激光器的一些应用中，重要的是耦合常数kappa被密切控制。 这不容易实现，经常导致可接受装置的低产量。 我已经发现，如果DFB激光器被设计成使得间隔层（在有源层和布拉格光栅之间）的厚度ts在与/（1）之间的值的+/- 10％内，则可以减小κ的变化 - alpha），哪里是模态衰减长度，alpha是表征层厚度的分数变化的分数变化的参数。

公开(公告)号：US06408014B1

公开(公告)日：2002-06-18

申请号：US09348549

申请日：1999-07-07

申请人： David A. Ackerman ,  John E. Johnson

发明人： David A. Ackerman ,  John E. Johnson

IPC分类号： H01S313

CPC分类号： H01S5/0265 ,  H01S5/0264 ,  H01S5/06256 ,  H01S5/06258

摘要： A monolithically integrated light source and frequency discriminator has a section in which a single frequency optical signal is produced and a section in which the frequency is sensed. The output of the optical discriminator is connected to a controller for stabilizing the output frequency of the light source.

摘要翻译： 单片集成光源和鉴频器具有其中产生单频光信号的部分和感测频率的部分。 光鉴别器的输出端连接到控制器，用于稳定光源的输出频率。

公开(公告)号：US06186937B1

公开(公告)日：2001-02-13

申请号：US09365085

申请日：1999-07-30

申请人： David A. Ackerman ,  Thomas L. Koch

发明人： David A. Ackerman ,  Thomas L. Koch

IPC分类号： G01B902

CPC分类号： G02B5/284

摘要： A method and device for obtaining a desired phase of optical characteristic of a Fabry-Perot (FP) etalon using multiple optical detectors which, while passively aligned at various positions relative to an incident light beam, detect different phases of light signal emerging from the FP etalon. An FP etalon and optical detector array constructed in accordance with the present invention may be used as a frequency discriminator in an optical system where the FP etalon optical characteristic is required to have a particular phase.

摘要翻译： 一种使用多个光学检测器获得法布里 - 珀罗（FP）标准具的期望相位的期望相位的方法和装置，该光学检测器虽然被动地对准在相对入射光束的各个位置被动对准，但检测出从FP产生的光信号的不同相位 标准具。 根据本发明构造的FP标准具和光学检测器阵列可以用作需要具有特定相位的FP标准具光学特性的光学系统中的鉴频器。

公开(公告)号：US06862394B2

公开(公告)日：2005-03-01

申请号：US10036437

申请日：2002-01-07

申请人： David A. Ackerman ,  John E. Johnson ,  David V. Lang ,  C. Lewis Reynolds, Jr.

发明人： David A. Ackerman ,  John E. Johnson ,  David V. Lang ,  C. Lewis Reynolds, Jr.

IPC分类号： G02B6/12 ,  H01S5/0625 ,  H01S5/12 ,  G02B6/10

CPC分类号： H01S5/06255 ,  G02B2006/12107 ,  G02B2006/12121 ,  H01S5/06256 ,  H01S5/06258 ,  H01S5/1228

摘要： A method of increasing the monomolecular recombination and the immunity to noise of a continuously tunable laser is disclosed. A concentration of recombination centers in the range of about 1×1016 cm−3 to about 1×1018 cm−3 in the tuning region of the laser device is achieved by doping the waveguide layer with impurity atoms, by irradiating the waveguide layer with high energy particles or by varying the growth conditions of the waveguide layer to introduce native point defects due to lattice mismatch. This way, the monomolecular recombination is increased and the radiative recombination over low current ranges is reduced. By increasing the monomolecular recombination, the immunity to noise is improved but the tuning efficiency is reduced. Nevertheless, only a minimal effect on the tuning efficiency is noted over high current ranges and, therefore, the overall tuning range is only insignificantly changed.

摘要翻译： 公开了增加连续可调激光器的单分子重组和抗噪声的方法。 在激光器件的调谐区域中，在约1×10 16 cm -3至约1×10 18 cm -3范围内的复合中心浓度通过用杂质原子掺杂波导层来实现，通过 用高能粒子照射波导层，或通过改变波导层的生长条件来引入由于晶格失配引起的自然点缺陷。 这样，单分子重组增加，并且在低电流范围内的辐射复合减少。 通过增加单分子重组，提高了对噪声的抗扰性，但调谐效率降低。 然而，在高电流范围内仅注意到对调谐效率的最小影响，因此整体调谐范围只有微不足道的变化。

公开(公告)号：US5001720A

公开(公告)日：1991-03-19

申请号：US456991

申请日：1989-12-26

申请人： David A. Ackerman ,  Chien Y. Kuo

发明人： David A. Ackerman ,  Chien Y. Kuo

IPC分类号： H01S5/00 ,  H01S5/06 ,  H01S5/0625 ,  H01S5/14

CPC分类号： H01S5/14 ,  H01S5/0014 ,  H01S5/0625 ,  H01S5/0618

摘要： A hybrid laser arrangement is disclosed which is capable of providing an essentially uniform FM response and a relatively narrow linewidth signal, suitable for FM applications. The uniform FM response is obtained by inducing inhomogeneous linewidth enhancement through control of the bias currents applied to separate gain sections of a two-electrode Fabry-Perot device. Coupling of the two-electrode device to a narrowband resonant optical reflector provides for an extremely narrow signal linewidth.

公开(公告)号：US07016097B2

公开(公告)日：2006-03-21

申请号：US10036397

申请日：2002-01-07

申请人： David A. Ackerman ,  Charles D. Brandle, Jr. ,  Glen R. Kowach ,  Lynn F. Schneemeyer

发明人： David A. Ackerman ,  Charles D. Brandle, Jr. ,  Glen R. Kowach ,  Lynn F. Schneemeyer

IPC分类号： G02F1/01 ,  G02F1/07 ,  H04J14/02 ,  H01S3/13

CPC分类号： G02F1/0147 ,  G02B2006/12135 ,  H04B10/503 ,  H04B10/572 ,  H04J14/02

摘要： The thermo-optic behavior of an optical path over a range of temperatures is controlled by determining a figure of merit (FoM) for the optical path and including in the path a body of NaBi(Mo1-xWxO4)2 crystalline material that enables the conditions specified by the FOM to be satisfied. The NaBi(Mo1-xWxO4)2 crystalline material is highly transparent at a wavelength of radiation propagating in the path, and has a coefficient of thermal expansion (CTE) and a refractive index n such that the CTE and dn/dT of the etalon compensate one another so as to perform frequency discrimination that is essentially temperature insensitive over the range ΔT. The NaBi(Mo1-xWxO4)2 crystalline material exhibits temperature independent transmission characteristics at about room temperature and at a wavelength of about 1550 nm.

摘要翻译： 通过确定光路的品质因数（FoM）来控制在一定温度范围内的光路的热光学行为，并且在路径中包括NaBi（Mo 1-x-x） 使得能够满足由FOM规定的条件的W 2 O 3结晶材料。 NaBi（Mo 1-x x W 2 O 4）2结晶材料在波长为 辐射在路径中传播，并且具有热膨胀系数（CTE）和折射率n，使得标准具的CTE和dn / dT彼此补偿，以便在DeltaT的范围内进行基本上温度不敏感的频率鉴别 。 NaBi（Mo 1-x W 2 x 4 O 4）2结晶材料在约20℃下显示出与温度无关的传输特性 室温和约1550nm的波长。

公开(公告)号：US06690689B2

公开(公告)日：2004-02-10

申请号：US10157452

申请日：2002-05-29

申请人： David A. Ackerman ,  Eric J. Dean

发明人： David A. Ackerman ,  Eric J. Dean

IPC分类号： H01S310

CPC分类号： H01S5/0021 ,  H01S5/06256 ,  H01S5/06825

摘要： The present invention provides a method and apparatus for compensating for the age induced wavelength drift in a tunable DBR. In practice, the tuning characteristic (i.e. output wavelength versus tuning current) of a tunable DBR may be characterized before and after factory aging, typically in the form of a burn-in or purge cycle. An aging vector may be constructed in accordance with the ratio of the change in the tuning characteristic associated with a second output wavelength and the change in the tuning characteristic associated with a first output wavelength as a function of the factory aging. In addition, the tuning characteristic associated with transmission at the first output wavelength may be monitored in the field. A controller may then update the value of the tuning characteristic associated with the second output wavelength to switch to the second output wavelength in manner that compensates for age induced wavelength drift as a function of the measured in field value of the tuning characteristic associated with transmission at a first output wavelength and said aging vector.

摘要翻译： 本发明提供一种用于补偿可调谐DBR中的年龄感应波长漂移的方法和装置。 在实践中，可调谐DBR的调谐特性（即，输出波长对调谐电流）可以在工厂老化之前和之后表征，通常以老化或清除循环的形式。 可以根据与第二输出波长相关联的调谐特性的变化与作为工厂老化的函数的与第一输出波长相关联的调谐特性的变化的比率来构造老化矢量。 此外，可以在现场监视与在第一输出波长的传输相关联的调谐特性。 然后，控制器可以更新与第二输出波长相关联的调谐特性的值以便以补偿年龄感应波长漂移的方式切换到第二输出波长，作为与传输相关联的调谐特性的测量场函数的函数 第一输出波长和所述衰减矢量。

公开(公告)号：US5506859A

公开(公告)日：1996-04-09

申请号：US389665

申请日：1995-02-16

申请人： David A. Ackerman ,  Leonard J. Ketelsen

发明人： David A. Ackerman ,  Leonard J. Ketelsen

IPC分类号： H01S5/00 ,  H01S5/12 ,  H01S5/323 ,  H01S3/08

CPC分类号： H01S5/1228 ,  H01S5/32391

摘要： A DFB laser with improved loss grating is disclosed. The grating contains periodically patterned first and second semiconductor layers that are embedded in semiconductor material of composition selected to provide relatively low loss for the laser radiation. The composition of the first layer is selected to provide a relatively high refractive index and loss for the laser radiation, and the composition of the second layer is selected to provide relatively low refractive index and loss for the laser radiation. The thicknesses of the first and second layers are selected such that the real part of the coupling constant .vertline..kappa.'.vertline. is less than the imaginary part of the coupling constant .vertline..kappa.".vertline.. In preferred embodiments .vertline..kappa.'.vertline..ltoreq.0.5.vertline..kappa.".vertline., even.ltoreq.0.2.vertline..kappa.".vertline..

摘要翻译： 公开了一种具有改进的损耗光栅的DFB激光器。 光栅包含周期性图案化的第一和第二半导体层，其被嵌入被选择为为激光辐射提供相对低的损耗的组成的半导体材料中。 选择第一层的组成以为激光辐射提供相对高的折射率和损耗，并且选择第二层的组成以为激光辐射提供相对低的折射率和损耗。 选择第一层和第二层的厚度，使得耦合常数|的实部 kappa'| 小于耦合常数|的虚部 kappa''|。 在优选实施例中 kappa'|

公开(公告)号：US5124281A

公开(公告)日：1992-06-23

申请号：US572592

申请日：1990-08-27

申请人： David A. Ackerman ,  Greg E. Blonder ,  William M. MacDonald

发明人： David A. Ackerman ,  Greg E. Blonder ,  William M. MacDonald

IPC分类号： G02B6/42 ,  H01L33/00 ,  H01S5/00 ,  H01S5/02 ,  H01S5/022

CPC分类号： G02B6/4234 ,  G02B6/4204 ,  G02B6/423 ,  G02B6/4232 ,  H01L2224/48091 ,  H01L2924/01014 ,  H01S5/02252 ,  H01S5/02284 ,  H01S5/0683

摘要： A laser (15) is mounted on a planar surface of a monocrystalline silicon mounting member (12). A spherical lens (20) is mounted in a monocrystalline silicon cover member (13) which, when abutted and registered to the mounting member (12), aligns the spherical lens with the laser so that the output light can be projected along a precise predetermined path. The spherical lens (20) is mounted in a first V-shaped groove (31) which is made in the cover member by masking and etching. A second V-shaped groove intersects the first groove and defines a V-shaped edge in one side of the first groove. The spherical lens is then seated in the first V-shaped groove such that it bears against two points of the V-shaped edge and against one side wall (35) of the first V-shaped groove. A second lens (19) is mounted in the cover member in the same manner as the first lens and directs laser light from a rear facet of the laser to a mirror 30 and hence to a photodetector (21) mounted in the cover member.