公开(公告)号：US5568505A

公开(公告)日：1996-10-22

申请号：US463635

申请日：1995-06-06

申请人： Tetsuro Okuda ,  Hirohito Yamada ,  Toshitaka Torikai

发明人： Tetsuro Okuda ,  Hirohito Yamada ,  Toshitaka Torikai

IPC分类号： H01S5/028 ,  H01S5/062 ,  H01S5/10 ,  H01S5/12 ,  H01S3/08

CPC分类号： H01S5/12 ,  H01S5/028 ,  H01S5/06213 ,  H01S5/1039 ,  H01S5/1225

摘要： In a laser diode element including a front facet, a rear facet, a laser cavity formed between the front the rear facets and which has a predetermined length L, coating layers coated on the front facet to provide a reflectivity smaller than 5%, and an active layer and a uniform grating having regular corrugation formed in the direction of the laser cavity and which are coupled to each other at a predetermined coupling constant K, the laser diode element is specified by a product of the predetermined coupling constant and the predetermined length L and falling within a range between 0.4 and 1.0, both inclusive.

摘要翻译： 在包括前刻面，后刻面的激光二极管元件，形成在前后面之间并且具有预定长度L的激光腔之间，涂覆在前刻面上的涂层以提供小于5％的反射率，以及 有源层和在激光腔的方向上形成有规则的波纹并且以预定的耦合常数K彼此耦合的均匀的光栅，激光二极管元件由预定的耦合常数和预定长度L的乘积 并落在0.4和1.0之间的范围内。

公开(公告)号：US06259718B1

公开(公告)日：2001-07-10

申请号：US09199789

申请日：1998-11-25

申请人： Tetsuro Okuda

发明人： Tetsuro Okuda

IPC分类号： H01S308

CPC分类号： H01S5/12 ,  H01S5/1014 ,  H01S5/1064 ,  H01S5/1206 ,  H01S5/1215

摘要： A distributed feedback laser device comprises an optical waveguide having one end facet serving as a beam emission surface and the other end facet serving as a reflection surface, an active layer formed between the beam emission surface and the reflection surface, and a diffraction grating formed so as to extend along the active layer in the optical waveguide. The active layer has a first region located nearer to the beam emission surface than to the reflection surface and a second region located nearer to the reflection surface than to the beam emission surface. The first region is narrower in width than the second region. The diffraction grating has first and second portions located along the first and the second regions, respectively. The first portion is longer in pitch than the second portion.

摘要翻译： 分布式反馈激光装置包括一个光波导，其具有一个端面用作光束发射表面，另一个端面用作反射表面，形成在光束发射表面和反射表面之间的有源层，以及形成为衍射光栅的衍射光栅 以沿着光波导中的有源层延伸。 有源层具有比反射表面更靠近光束发射表面的第一区域和位于比反射表面更靠近反射表面的第二区域。 第一区域的宽度比第二区域窄。 衍射光栅具有分别沿着第一和第二区域设置的第一和第二部分。 第一部分的间距比第二部分长。

公开(公告)号：US06229836B1

公开(公告)日：2001-05-08

申请号：US09328504

申请日：1999-06-09

申请人： Tetsuro Okuda

发明人： Tetsuro Okuda

IPC分类号： H01S319

CPC分类号： H01S5/227 ,  H01S5/2226 ,  H01S5/2277

摘要： A dopant such as Si is introduced to recombination layers 2. The Si concentration is about 1×1017 to 5×1018 cm−3. Thus, a carrier lifetime in the recombination layers 2 may be reduced to relatively increase a leakage current flowing the recombination layers 2 while relatively reducing a leakage current flowing channels 3.

摘要翻译： 将诸如Si的掺杂剂引入复合层2.Si浓度为约1×10 17至5×10 18 cm -3。 因此，可以减少复合层2中的载流子寿命，以相对地增加流过复合层2的漏电流，同时相对减少流过通道3的漏电流。

公开(公告)号：US5450432A

公开(公告)日：1995-09-12

申请号：US303940

申请日：1994-09-09

申请人： Tetsuro Okuda

发明人： Tetsuro Okuda

IPC分类号： H01S5/00 ,  H01S5/042 ,  H01S5/06 ,  H01S5/0625 ,  H01S3/10

CPC分类号： H01S5/0625 ,  H01S5/0425 ,  H01S5/06258

摘要： A semiconductor distributed feedback laser emitting device has upper electrodes arranged in a longitudinal direction of an oscillator for supplying current to the oscillator, and a separating electrode is provided between the upper electrodes for making the distribution of an electric field strength in the longitudinal direction uniform by changing the current density in the separating electrode with respect to the current density in the upper electrodes, thereby improving a second intermodulation distortion.

摘要翻译： 半导体分布式反馈激光发射装置具有沿振荡器的纵向布置的上电极，用于向振荡器提供电流，并且在上电极之间设置分离电极，用于使纵向电场强度分布均匀通过 相对于上电极中的电流密度改变分离电极中的电流密度，从而改善第二互调失真。

公开(公告)号：US5394429A

公开(公告)日：1995-02-28

申请号：US144038

申请日：1993-11-01

申请人： Hirohito Yamada ,  Tetsuro Okuda ,  Toshitaka Torikai

发明人： Hirohito Yamada ,  Tetsuro Okuda ,  Toshitaka Torikai

IPC分类号： H01S5/10 ,  H01S5/12 ,  H01S5/20 ,  H01S5/227 ,  H01S3/08

CPC分类号： H01S5/12 ,  H01S5/1064 ,  H01S5/1206 ,  H01S5/1215 ,  H01S5/1225 ,  H01S5/2077 ,  H01S5/2272 ,  H01S5/2277

摘要： A distributed-feedback laser has a diffractive grating, an optical waveguide layer, and an active region. The optical waveguide layer has equivalent refractive indexes larger towards cavity end facets and smaller towards a device center portion along a cavity. The active region containing the optical waveguide layer has widths wider towards the cavity end facets and narrower towards the device center portion along the cavity. The optical waveguide layer has a uniform electric intensity distribution along the cavity to improve the linearity of current versus optical output characteristics. In another arrangement, the optical waveguide layer formed on the diffractive grating has in its compositions longer wavelengths towards the cavity end facets and shorter wavelengths towards the cavity center portion along the cavity, whereby the optical waveguide layer has a uniform optical intensity distribution along the cavity to improve the linearity of current versus optical output characteristics. The distributed-feedback laser provided is with improved analog modulation distortion characteristics.

摘要翻译： 分布反馈激光器具有衍射光栅，光波导层和有源区。 光波导层具有相对于腔端面较大的等效折射率，并且朝着沿腔的器件中心部分较小。 包含光波导层的有源区域具有朝向腔体端面更宽的宽度，并且沿着空腔朝向器件中心部分较窄。 光波导层沿着空腔具有均匀的电强度分布，以提高电流对光输出特性的线性度。 在另一种布置中，形成在衍射光栅上的光波导层在其组成中具有朝向空腔端面的较长波长和沿着空腔朝向空腔中心部分的较短波长，由此光波导层沿着空腔具有均匀的光强度分布 以提高电流对光输出特性的线性度。 提供的分布式反馈激光器具有改进的模拟调制失真特性。