公开(公告)号：US06635502B1

公开(公告)日：2003-10-21

申请号：US09741358

申请日：2000-12-20

申请人： Si Hyung Cho ,  William Crossley Dautremont-Smith ,  Sun-Yuan Huang ,  Charles H Joyner ,  Ronald Eugene Leibenguth ,  Abdallah Ougazzaden ,  Claude Lewis Reynolds, Jr.

发明人： Si Hyung Cho ,  William Crossley Dautremont-Smith ,  Sun-Yuan Huang ,  Charles H Joyner ,  Ronald Eugene Leibenguth ,  Abdallah Ougazzaden ,  Claude Lewis Reynolds, Jr.

IPC分类号： H01L2100

CPC分类号： B82Y20/00 ,  H01S5/2059 ,  H01S5/2218 ,  H01S5/227 ,  H01S5/2275 ,  H01S5/3434

摘要： The invention is a semiconductor optical device and method of fabrication where the device includes an active region with an active layer having a first index of refraction, and a blocking region having a second, lower index of refraction. A semiconductor layer having an index of refraction higher than the blocking region is formed over both the active and blocking regions so that the semiconductor layer is in closer proximity to the active layer in areas not covered by the blocking region so as to decrease the difference between the effective index of refraction in the active region and the effective refractive index of the blocking region. Such devices are particularly useful for pumping optical amplifiers since greater power can be achieved while maintaining single mode emission.

摘要翻译： 本发明是一种半导体光学器件及其制造方法，其中器件包括具有第一折射率的有源层的有源区和具有第二较低折射率的阻挡区。 在有源屏蔽区域和阻挡区域之间形成具有高于阻挡区域的折射率的半导体层，使得半导体层在未被阻挡区域覆盖的区域中更靠近有源层，以便减小区域之间的差异 有效区域中的有效折射率和阻挡区域的有效折射率。 这样的器件对于泵浦光放大器特别有用，因为可以在保持单模发射的同时实现更大的功率。

公开(公告)号：US06567446B1

公开(公告)日：2003-05-20

申请号：US09640289

申请日：2000-08-16

申请人： Sun-Yuan Huang ,  Kenneth L. Bacher ,  Si Hyung Cho ,  William Crossley Dautremont-Smith

发明人： Sun-Yuan Huang ,  Kenneth L. Bacher ,  Si Hyung Cho ,  William Crossley Dautremont-Smith

IPC分类号： H01S500

CPC分类号： H01S5/12 ,  H01S5/1064 ,  H01S5/2275

摘要： The invention is an optical apparatus and method of fabrication wherein an optical device such as a semiconductor laser includes a grating and a waveguide optically coupled to the grating. At least a portion of the waveguide coupled to the grating has a width which varies along the length of the waveguide in such a manner as to broaden the spectral line width of light output from the device. The width can be varied according to linear, sinusoidal or saw-tooth functions. A broadened line width permits pumping of a Raman amplifier at a high power without inducing any significant Brillouin Scattering.

摘要翻译： 本发明是一种光学装置和制造方法，其中诸如半导体激光器的光学装置包括光栅和光学耦合到光栅的波导。 耦合到光栅的波导的至少一部分具有沿着波导长度变化的宽度，以便扩大从该器件输出的光的谱线宽度。 宽度可以根据线性，正弦曲线或锯齿功能而变化。 扩大的线宽允许以高功率泵浦拉曼放大器，而不会引起任何显着的布里渊散射。

公开(公告)号：US06574262B1

公开(公告)日：2003-06-03

申请号：US09545473

申请日：2000-04-07

申请人： William Crossley Dautremont-Smith ,  Sun-Yuan Huang

发明人： William Crossley Dautremont-Smith ,  Sun-Yuan Huang

IPC分类号： H01S308

CPC分类号： H01S5/146 ,  H01S3/094003 ,  H01S5/0654 ,  H01S5/147 ,  H01S5/2036

摘要： The present invention is directed to a large area single-mode (LASM) laser system that provides a laser having a wider gain region and thus a higher power output without introducing the second transverse mode into the optical signal. The laser system of the present invention also reduces the laser junction temperature, thereby improving the reliability of the laser and of laser systems constructed therefrom. The present invention also provides a stabilized spectrum in an optical signal by providing a means for feeding back from an external fiber grating to the laser only a single mode and a selective spectrum of an optical signal generated by the laser.

摘要翻译： 本发明涉及一种大面积单模（LASM）激光系统，其提供具有更宽增益区域的激光器，从而提供较高功率输出，而不将第二横向模式引入光信号。 本发明的激光系统还降低了激光结温度，从而提高了激光器及其构成的激光系统的可靠性。 本发明还通过提供一种用于从外部光纤光栅向激光器仅反射单一模式和由激光产生的光学信号的选择光谱的装置提供光信号中的稳定光谱。

公开(公告)号：US5943554A

公开(公告)日：1999-08-24

申请号：US898260

申请日：1997-07-22

申请人： William Crossley Dautremont-Smith ,  Todd Robert Hayes

发明人： William Crossley Dautremont-Smith ,  Todd Robert Hayes

IPC分类号： H01S5/12 ,  H01S5/20 ,  H01S5/227 ,  H01S3/19

CPC分类号： H01S5/12 ,  H01S5/1225 ,  H01S5/2077 ,  H01S5/2272

摘要： A distributed feedback (DFB) laser is made with a spatially graded optical coupling (.kappa.) between its diffraction grating and its active layer by means of selective area epitaxial growth of the epitaxial layer from which the grating is formed. More specifically, the epitaxial layer is formed on a major surface of a semiconductor substrate on which a mask, such as a silicon dioxide mask, has been formed. The mask has a pair of segments spaced apart by a fixed distance, the segments having spatially variable widths. Advantageously the epitaxial layer has a refractive index that is different from that of the substrate at the operating wavelength of the laser. The epitaxial layer is then etched into stripes. In this way the heights of the resulting grating stripes will be spatially variable, and so will the coupling .kappa. between the grating and the active layer. In this way, the properties of the optical output of the laswer can be adjusted. Advantageously also, the spacer layer and the substrate have the same refractive indices at the operating wavelength of the laser, whereby accurate control over the depth of the etching is not required.

摘要翻译： 通过从其形成光栅的外延层的选择性区域外延生长，在其衍射光栅及其有源层之间通过空间梯度光耦合（kappa）制成分布反馈（DFB）激光器。 更具体地，外延层形成在半导体衬底的主表面上，其上形成有诸如二氧化硅掩模的掩模。 该掩模具有间隔开固定距离的一对段，该段具有空间上可变的宽度。 有利地，外延层具有与激光器的工作波长处的衬底的折射率不同的折射率。 然后将外延层蚀刻成条纹。 以这种方式，所得到的光栅条纹的高度将在空间上是可变的，并且光栅和有源层之间的耦合kappa也是如此。 以这种方式，可以调节激光器的光学输出的特性。 有利的是，间隔层和衬底在激光器的工作波长处具有相同的折射率，从而不需要对蚀刻深度的精确控制。