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    Broadband tunable semiconductor laser source
    1.
    发明授权
    Broadband tunable semiconductor laser source 失效
    宽带可调半导体激光源

    公开(公告)号：US6108362A

    公开(公告)日：2000-08-22

    申请号：US954305

    申请日：1997-10-17

    申请人： Laura Ellen Adams ,  Clyde George Bethea ,  Wei-Chiao Fang ,  Gerald Nykolak ,  Roosevelt People ,  Arthur Mike Sergent ,  Tawee Tanbun-Ek ,  Won-Tien Tsang

    发明人： Laura Ellen Adams ,  Clyde George Bethea ,  Wei-Chiao Fang ,  Gerald Nykolak ,  Roosevelt People ,  Arthur Mike Sergent ,  Tawee Tanbun-Ek ,  Won-Tien Tsang

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

    CPC分类号： H01S5/06258 ,  H01S5/10

    摘要： A tunable semiconductor laser comprises a gain section having an MQW active region, a uniform pitch grating DFB region, and first waveguide. A composite reflector, including a second MQW region and a second waveguide, forms a cavity resonator with the DFB region. A voltage applied to the composite reflector induces a quantum confined stark effect, thereby allowing the wavelength to be altered. In one embodiment, the current drive to the active region and the shape of the first waveguide (e.g., a raised-sine function) are mutually adapted so that N longitudinal modes have essentially the same threshold gain and so that the DFB region spanned by the first waveguide is segmented into N zones, each zone providing optical feedback at a different wavelength corresponding to a different longitudinal mode.

    摘要翻译： 可调谐半导体激光器包括具有MQW有源区，均匀间距光栅DFB区和第一波导的增益部。 包括第二MQW区域和第二波导的复合反射器与DFB区域形成空腔谐振器。 施加到复合反射器的电压引起量子限制的斯塔克效应，从而允许改变波长。 在一个实施例中，对有源区域的当前驱动和第一波导的形状（例如，升高的正弦函数）相互适应，使得N个纵向模式具有基本上相同的阈值增益，并且使得由 第一波导被分割成N个区域，每个区域提供对应于不同纵向模式的不同波长的光学反馈。

    Sub-carrier multiplexing in broadband optical networks
    4.
    发明授权
    Sub-carrier multiplexing in broadband optical networks 失效
    宽带光网络中的子载波复用

    公开(公告)号：US06081361A

    公开(公告)日：2000-06-27

    申请号：US954575

    申请日：1997-10-17

    申请人： Laura Ellen Adams ,  Clyde George Bethea ,  Gerald Nykolak ,  Roosevelt People ,  Tawee Tanbun-Ek

    发明人： Laura Ellen Adams ,  Clyde George Bethea ,  Gerald Nykolak ,  Roosevelt People ,  Tawee Tanbun-Ek

    IPC分类号： H04J14/00 ,  H01S5/00 ,  H01S5/02 ,  H01S5/026 ,  H01S5/06 ,  H01S5/0625 ,  H01S5/12 ,  H01S5/50 ,  H04B10/04 ,  H04B10/06 ,  H04B10/142 ,  H04B10/152 ,  H04J7/00 ,  H04J14/02 ,  H04B10/01 ,  H01S3/08 ,  H04B10/12

    CPC分类号： H04J14/0298 ,  H01S5/0265 ,  H01S5/06258 ,  H04J7/00 ,  H01S5/1243

    摘要： In a WDM fiber-optic network, a unique laser transmitter enables signals to be routed at three hierarchical levels: at one level discrimination among signal paths is based on N WDM wavelength channels, at another level discrimination is based on m AM subcarrier frequency channels, and at a third level discrimination is based on n FM subcarrier frequency channels. Thus, a total of Nmn distinguishable optical channels can be accommodated and a like number of users served. The laser transmitter comprises a broadband, tunable semiconductor laser which includes an intracavity, integrated composite reflector to which a tuning voltage and a FM dither signal are applied, an intracavity gain section to which drive current is applied, and an extracavity, integrated electroabsorption modulator to which an information (e.g., data, voice, video) signal and an AM dither signal are applied. The tuning voltage provides coarse wavelength tuning among N WDM channels, whereas the FM dither signal produces an additional m channels via FM-SCM. The AM dither likewise produces an additional n channels via AM-SCM.

    摘要翻译： 在WDM光纤网络中，独特的激光发射机使信号能够以三个等级的级别进行路由：在一个级别，信号路径之间的鉴别基于N个WDM波长信道，在另一个等级，鉴别是基于m个AM子载波频率信道， 并且在第三级鉴别是基于n个FM子载波频率信道。 因此，可以容纳总共Nmn个可辨别的光学通道并且服务相同数量的用户。 激光发射机包括宽带可调谐半导体激光器，其包括腔内，集成复合反射器，调谐电压和FM抖动信号施加到该腔内，集成复合反射器，施加驱动电流的腔内增益部分，以及腔外集成电吸收调制器 其中应用信息（例如，数据，语音，视频）信号和AM抖动信号。 调谐电压在N个WDM通道中提供粗略的波长调谐，而FM抖动信号通过FM-SCM产生额外的m个通道。 AM抖动同样通过AM-SCM产生另外的n个通道。

    Optical system for reduced SBS
    6.
    发明授权
    Optical system for reduced SBS 有权
    用于减少SBS的光学系统

    公开(公告)号：US06331908B1

    公开(公告)日：2001-12-18

    申请号：US09444470

    申请日：1999-11-22

    申请人： Laura Ellen Adams ,  Clyde George Bethea ,  Lars Erik Eskildsen ,  Gerald Nykolak ,  Rossevelt People ,  Tawee Tanbun-Ek

    发明人： Laura Ellen Adams ,  Clyde George Bethea ,  Lars Erik Eskildsen ,  Gerald Nykolak ,  Rossevelt People ,  Tawee Tanbun-Ek

    IPC分类号： H04B1004

    CPC分类号： H04B10/2537

    摘要： A tunable semiconductor laser comprises a gain section having an MQW active region, a uniform pitch grating DFB region, and first waveguide. A composite reflector, including a second MQW region and a second waveguide, forms a cavity resonator with the DFB region. A tuning voltage applied to the composite reflector induces refractive index changes, thereby allowing the center wavelength to be altered. A dither signal applied the composite reflector broadens the spectrum of the laser output, thereby reducing SBS in fiber optic systems

    摘要翻译： 可调谐半导体激光器包括具有MQW有源区，均匀间距光栅DFB区和第一波导的增益部。 包括第二MQW区域和第二波导的复合反射器与DFB区域形成空腔谐振器。 施加到复合反射器的调谐电压引起折射率变化，从而允许改变中心波长。 施加复合反射器的抖动信号使激光输出的频谱变宽，从而减少光纤系统中的SBS