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1. 发明申请

WO1997031435A1 DISPERSION COMPENSATION IN OPTICAL FIBRE TRANSMISSION 审中-公开
标题翻译：光纤传输中的分散补偿
公开(公告)号：WO1997031435A1
公开(公告)日：1997-08-28
申请号：PCT/GB1997000504
申请日：1997-02-21
申请人： PIRELLI CAVI SPA , LOH, Wei-Hung , LAMING, Richard, Ian , ATKINSON, David , O'REILLY, John, James
发明人： PIRELLI CAVI SPA
IPC分类号： H04B10/18
CPC分类号： G02B6/2932 , G02B6/29394 , H04B10/2519 , H04B2210/254
摘要： Optical transmission apparatus, for transmission of optical signals at an optical wavelength of about 1550 nanometres, comprises: a single mode optical fibre link formed of optical fibre having substantially zero dispersion at an optical wavelength of about 1300 nanometres and a dispersion of about 17 picoseconds per nanometre-kilometre at an optical wavelength of about 1500 nanometres; and one or more dispersion compensating chirped optical fibre gratings, the aggregate dispersion of the chirped optical fibre gratings substantially compensating for the dispersion of the optical fibre link; in which the one or more gratings are coupled to the optical fibre link at respective positions substantially symmetrically disposed about the longitudinal centre of the optical fibre link.
摘要翻译：用于在约1550纳米的光波长下传输光信号的光传输装置包括：由光纤形成的单模光纤链路，其在大约1300纳米的光波长处具有基本为零的色散，并且每个色散约为17皮秒在约1500纳米的光波长下的纳米公里; 和一个或多个色散补偿啁啾光纤光栅，啁啾光纤光栅的总体色散基本上补偿了光纤链路的色散; 其中一个或多个光栅在围绕光纤链路的纵向中心大致对称设置的各个位置处耦合到光纤链路。

2. 发明申请

WO1998008121A1 OPTICAL DISPERSION COMPENSATION 审中-公开
标题翻译：光分散补偿
公开(公告)号：WO1998008121A1
公开(公告)日：1998-02-26
申请号：PCT/GB1997002100
申请日：1997-08-04
申请人： PIRELLI CAVI E SISTEMI S.P.A. , LAMING, Richard, Ian , LOH, Wei-Hung
发明人： PIRELLI CAVI E SISTEMI S.P.A.
IPC分类号： G02B06/16
CPC分类号： G02B6/02109 , G02B6/02085 , G02B6/274 , G02B6/2746 , G02B6/278 , G02B6/29319 , G02B6/29394
摘要： A chirped optical fibre grating formed by impressing a chirped substantially periodic refractive index variation on a polarisation-maintaining optical fibre. The polarisation state of a laser transmitter (10) is maintained through an external modulator (20) and a polarisation maintaining circulator (30) by the use of polarisation maintaining fibre pigtails (40) aligned to one of the principal axes of high birefringence optical fibre used to fabricate the dispersion compensating grating (50). On reflection, light is output from the third port (60) of the circulator. Since only one polarisation mode of the grating (50) is excited, the PMD in the grating is eliminated. The polarisation maintaining circulator (30) comprises input/output lenses (32) at each port, a polarisation beam splitter (34) and a Faraday rotator (36). Light entering the circulator at the input port is arranged to be in a polarisation that passes through the polarisation beam splitter (34) towards the second port of the circulator. The light is rotated by 45 DEG in the rotator (36). The grating (50) and the fibre pigtail at the second port of the circulator are arranged with their principal axes rotated by 45 DEG with respect to the axes of the input to the circulator. Light reflected from the grating is then further rotated by 45 DEG by the rotator, into the polarisation which is deverted by the polarisation beam splitter (34). This light is therefore diverted to the third output (60) of the circulator. Another embodiment in which two chirped gratings (100, 110) are formed in high birefringence polarisation maintaining fibre with axes aligned, and a 45 DEG Faraday rotator (120) is placed inbetween.
摘要翻译：通过在偏振保持光纤上施加啁啾的基本上周期性的折射率变化而形成的啁啾光纤光栅。激光发射器（10）的偏振状态通过使用与高双折射光纤的主轴之一对准的偏振保持光纤尾纤（40）通过外部调制器（20）和偏振保持环行器（30）来保持用于制造色散补偿光栅（50）。在反射时，从循环器的第三端口（60）输出光。由于光栅（50）的仅一个偏振模式被激发，所以光栅中的PMD被消除。偏振保持环行器（30）包括在每个端口处的输入/输出透镜（32），偏振分束器（34）和法拉第旋转器（36）。在输入端口进入循环器的光被布置成处于朝向循环器的第二端口的偏振中。灯在旋转器（36）中旋转45°。循环器第二端口处的光栅（50）和光纤尾纤相对于循环器的输入轴旋转45°。然后从光栅反射的光由旋转器进一步旋转45°，进入由偏振光束分离器（34）消除的偏振光。因此，该光被转移到循环器的第三输出端（60）。其中两个啁啾光栅（100,110）形成在具有轴对准的高双折射偏振保持光纤中的另一实施例，并且45°法拉第转子（120）放置在其间。

3. 发明申请

WO1997026581A1 OPTICAL DEVICE 审中-公开
标题翻译：光学装置
公开(公告)号：WO1997026581A1
公开(公告)日：1997-07-24
申请号：PCT/GB1997000113
申请日：1997-01-15
申请人： PIRELLI CAVI S.P.A. , LAMING, Richard, Ian , BARCELOS, Sergio , LOH, Wei-Hung , ZERVAS, Michael, Nickolaos
发明人： PIRELLI CAVI S.P.A.
IPC分类号： G02F01/01
CPC分类号： G02B6/022 , G02B6/29322 , G02B6/29394 , G02B6/4226 , G02B6/4246
摘要： An optical device comprises an optical fibre device having wavelength-dependent optical characteristics mounted on a bimorph element operable to bend in response to an electrical control signal, so that the wavelength-dependent optical characteristics of the optical fibre device vary in response to bending of the bimorph element.
摘要翻译：光学装置包括具有安装在双压电元件上的波长相关光学特性的光纤装置，其可操作以响应于电控制信号而弯曲，使得光纤装置的波长相关光学特性响应于双压电晶元件。

4. 发明申请

WO1996036895A1 OPTICAL WAVEGUIDE GRATING 审中-公开
标题翻译：光波导光栅
公开(公告)号：WO1996036895A1
公开(公告)日：1996-11-21
申请号：PCT/GB1996001154
申请日：1996-05-14
申请人： UNIVERSITY OF SOUTHAMPTON , COLE, Martin , LOH, Wei-Hung , LAMING, Richard, Ian , ZERVAS, Michael, Nickolaos
发明人： UNIVERSITY OF SOUTHAMPTON
IPC分类号： G02B06/16
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.
摘要翻译：描述形成诸如光纤内光栅的光波导光栅的方法。光栅被光学地形成，相位掩模被写入激光束扫描以产生光栅图案。波导和相位掩模在写入过程中相对于彼此移动，以沿着光栅的长度改变光栅特性。在单个方向上的相对运动提供光栅间距的变化，因此可用于制造啁啾或多波长光栅。双向抖动改变光栅的强度，因此可用于制造变迹光栅。

5. 发明申请

WO1995032451A1 OPTICAL DEVICES 审中-公开
标题翻译：光学设备
公开(公告)号：WO1995032451A1
公开(公告)日：1995-11-30
申请号：PCT/GB1995001141
申请日：1995-05-19
申请人： UNIVERSITY OF SOUTHAMPTON , LAMING, Richard, Ian , LOH, Wei-Hung , PAYNE, David, Neil , ZERVAS, Michael, Nickolaos
发明人： UNIVERSITY OF SOUTHAMPTON
IPC分类号： G02F01/35
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：描述了被动，自调整和跟踪光学波长滤波器（20）。过滤器是吸收性的，并且可以是透射型或反射型。滤波器包括一个未使用的掺杂光波导，其被配置成使得不同波长的信号在一定程度上在空间上解耦。过滤器中心波长的自调节是通过由适当的掺杂剂提供的功率依赖的可饱和吸收和由不同波长的空间去耦所产生的部分纵向孔燃烧的组合效应来实现的。还描述了在外腔中使用这种类型的滤波器的外腔激光器。该外腔配置可以提供例如半导体激光器的稳定的单频操作。通过使用用于外部空腔的可饱和吸收体（例如掺铒光纤），可以抑制纵向跳跃，确保单频操作。

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