公开(公告)号：EP0826161A1

公开(公告)日：1998-03-04

申请号：EP96915103.0

申请日：1996-05-14

申请人： UNIVERSITY OF SOUTHAMPTON

发明人： COLE, Martin ,  LOH, Wei-Hung ,  LAMING, Richard, Ian ,  ZERVAS, Michael, Nickolaos

IPC分类号： G02B5 ,  G02B6

CPC分类号： G02B6/02152 ,  G02B6/02085 ,  G02B6/02138

摘要： A method of forming optical waveguide gratings, such as in-fibre gratings, is described. The gratings are formed optically, with a phase mask being scanned by a writing laser beam to generate the grating pattern. The waveguide and phase mask are moved with respect to one another during the writing process, to vary the grating properties along the length of the grating. Relative movement in a single direction provides a change of grating pitch, and so can be used to fabricate chirped or multi-wavelength gratings. Bi-directional dither alters the strength of the grating, and so can be used to fabricate apodised gratings.

公开(公告)号：EP0756767B1

公开(公告)日：1998-07-15

申请号：EP95916756.0

申请日：1995-04-24

申请人： THE UNIVERSITY OF SOUTHAMPTON

发明人： SAMSON, Bryce, Neilson ,  HEWAK, Daniel, William ,  LAMING, Richard, Ian ,  PAYNE, David, Neil

IPC分类号： H01S3/17 ,  H01S3/06

CPC分类号： H01S3/06716 ,  H01S3/1606 ,  H01S3/1618 ,  H01S3/1698 ,  H01S3/17

摘要： PCT No. PCT/GB95/00928 Sec. 371 Date Feb. 26, 1997 Sec. 102(e) Date Feb. 26, 1997 PCT Filed Apr. 22, 1995 PCT Pub. No. WO95/29522 PCT Pub. Date Nov. 2, 1995The core of a low phonon energy glass optical fibre is doped with trivalent Dysprosium ions for application as an efficient optical fibre amplifier operating around 1.3 mu m. The device utilises the transition 6H9/2-6F11/2 to 6H15/2. The low phonon energy (high quantum efficiency) glasses include mixed halides, chalcogenides and chalcohalides. Improvements in efficiency can be achieved by co-doping of the fibre core with Eu3+ and/or Tb3+ ions.

公开(公告)号：EP0760111A1

公开(公告)日：1997-03-05

申请号：EP95919514.0

申请日：1995-05-19

申请人： UNIVERSITY OF SOUTHAMPTON

发明人： LAMING, Richard, Ian ,  LOH, Wei-Hung ,  PAYNE, David, Neil ,  ZERVAS, Michael, Nickolaos

IPC分类号： G02F1 ,  H01S3 ,  H01S5 ,  G02B6

CPC分类号： H01S3/06708 ,  G02B2006/2839 ,  G02F1/3523 ,  G02F2201/02 ,  G02F2202/06 ,  G02F2203/055 ,  H01S3/06737 ,  H01S3/0675 ,  H01S3/06754 ,  H01S3/08022 ,  H01S3/08027 ,  H01S5/141 ,  H01S5/146

摘要： Passive, self-adjusting and tracking optical wavelength filters (20) are described. The filters are absorptive and can be of either transmissive or reflective type. The filters comprise an unpumped doped optical waveguide configured so that signals of different wavelength are spatially decoupled to some extent. The self-adjustment of the filter centre wavelength is achieved by the combined effects of the power-dependent saturable absorption, provided by an appropriate dopant, and partial longitudinal hole burning povided by the spatial decoupling of the different wavelengths. External cavity lasers using this type of filter in the external cavity are also described. This external cavity configuration can provide stable single frequency operation of, for example, a semiconducteur laser. By using a saturable absorber for the external cavity (e.g. an erbium doped fibre), longitudinal mode-hopping can be suppressed, ensuring single frequency operation.

摘要翻译： 描述了无源自调整和跟踪光学波长滤波器（20）。 滤光片是吸收性的，可以是透射型或反射型。 滤波器包括未掺杂的光波导，其被配置为使得不同波长的信号在一定程度上在空间上解耦。 滤波器中心波长的自我调节是通过由适当掺杂剂提供的依赖于功率的可饱和吸收和由不同波长的空间去耦提供的部分纵向孔燃烧的组合效应实现的。 还描述了在外腔中使用这种滤波器的外腔激光器。 该外部空腔配置可以提供例如半导体激光器的稳定的单频操作。 通过对外腔使用可饱和吸收体（例如掺铒光纤），可以抑制纵向跳模，确保单频操作。