公开(公告)号：US5325392A

公开(公告)日：1994-06-28

申请号：US26451

申请日：1993-03-03

申请人： Yuichi Tohmori ,  Yoshikuni ,  Hiroyuki Ishii ,  Fumiyoshi Kano ,  Toshiaki Tamamura

发明人： Yuichi Tohmori ,  Yoshikuni ,  Hiroyuki Ishii ,  Fumiyoshi Kano ,  Toshiaki Tamamura

IPC分类号： G02B6/12 ,  G02B6/124 ,  H01S5/042 ,  H01S5/0625 ,  H01S5/12 ,  H01S3/10

CPC分类号： H01S5/12 ,  G02B6/124 ,  H01S5/06256 ,  H01S5/06258 ,  G02B2006/12107 ,  G02B2006/12121 ,  H01S5/0425 ,  H01S5/1218 ,  H01S5/1225

摘要： The distributed reflector includes a substrate and at least one optical waveguide formed on the substrate and having a refractive index larger than the substrate and at least one optical confinement layer having a refractive index smaller than the optical waveguide layer. A diffractive grating is formed in at least one layer constituting the optical waveguide. The diffractive grating has a structure of which at least one parameter defining optical reflectivity varies depending on its position, and is formed continuously for at least two periods, the period being approximately defined by the length of repeating unit region. The parameter may be pitch, coupling coefficient, bandgap composition, phase shift, etc. The semiconductor laser includes the distributed reflector which may be of a distributed reflector type or distributed feed back type and has distributed reflector regions and a phase adjustment region. Application of current or voltage to the refractive index of the active region or inactive region in which a diffractive grating is present or absent adjusts the refractive index thereof and enables coarse and fine adjustment of lasing wavelength.

摘要翻译： 分布式反射器包括基板和形成在基板上并具有大于基板的折射率的至少一个光波导以及折射率小于光波导层的至少一个光限制层。 在构成光波导的至少一层中形成衍射光栅。 衍射光栅具有这样的结构，其中限定光反射率的至少一个参数根据其位置而变化，并且连续形成至少两个周期，该周期近似地由重复单位区域的长度限定。 该参数可以是间距，耦合系数，带隙组成，相移等。半导体激光器包括分布式反射器，其可以是分布式反射器类型或分布式反馈型，并且具有分布式反射器区域和相位调整区域。 施加电流或电压对衍射光栅存在或不存在的有源区域或非活性区域的折射率进行调节，其折射率可以进行激光波长的粗调和微调。