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公开(公告)号:US6064786A
公开(公告)日:2000-05-16
申请号:US945993
申请日:1997-11-06
IPC分类号: G02B6/42 , G02B6/14 , H04B10/2581 , G02B6/26 , G02F1/00
CPC分类号: H04B10/2581 , G02B6/14
摘要: A method and apparatus for increasing the operational bandwidth of a multimode optical fiber communications system is provided. The method comprises launching optical radiation into the core of the multimode fiber away from the center of the core so as to strongly excite mid order modes of the multimode fiber, but to only weakly excite low order and high order modes of the multimode fiber. The mid order modes excited are predominately within a small number of mode groups and thus have similar propagation constants. This leads to a reduction in modal dispersion and thus to a significant increase in bandwidth compared to an overfilled launch. The offset launch of the invention is tolerant both to the launch conditions and to any imperfections in the fiber refractive index profile. Modal noise performance is also enhanced. Embodiments of the invention employ a singlemode fiber, a multimode fiber or a lens to illuminate an end face of a multimode fiber with a small spot offset from the optical axis of the fiber.
摘要翻译: PCT No.PCT / GB97 / 00647 Sec。 371日期:1997年11月6日 102(e)日期1997年11月6日PCT 1997年3月10日PCT公布。 公开号WO97 / 33390 日期1997年9月12日提供了一种用于增加多模光纤通信系统的操作带宽的方法和装置。 该方法包括将光辐射从核心的中心向多模光纤的核心发射,以便强烈地激发多模光纤的中间阶模,但是只能弱激发多模光纤的低阶和高阶模。 激发的中级模式主要在少数模式组内,因此具有相似的传播常数。 这导致模式色散的降低,从而与过满的发射相比,带宽显着增加。 本发明的偏移发射对于发射条件和光纤折射率分布中的任何缺陷是宽容的。 模态噪声性能也得到提高。 本发明的实施例采用单模光纤,多模光纤或透镜来照射具有偏离光纤的光轴的小光点的多模光纤的端面。
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公开(公告)号:US06304352B1
公开(公告)日:2001-10-16
申请号:US09076644
申请日:1998-05-12
IPC分类号: H04B1000
CPC分类号: H04B10/2581
摘要: A method and apparatus is provided for connecting an optical source to a multimode optical fibre in a multimode optical fibre communications system. A single mode fibre length is provided such that optical radiation admitted from an optical source at one end of the single mode fibre length is provided to a multimode optical fibre at the other end of the single mode fibre length. This method and apparatus is used in a duplex patchcord for connecting an optical transceiver to a pair of installed multimode fibres. The second fibre in the patchcord is a multimode fibre for passing optical signals to the optical receiver of the transceiver.
摘要翻译: 提供了一种用于在多模光纤通信系统中将光源连接到多模光纤的方法和装置。 提供单模光纤长度,使得在单模光纤长度的一端从光源允许的光辐射被提供给单模光纤长度另一端的多模光纤。 该方法和装置用于将光收发器连接到一对安装的多模光纤的双工跳线。 跳线中的第二个光纤是用于将光信号传送到收发器的光接收器的多模光纤。
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公开(公告)号:US06609834B2
公开(公告)日:2003-08-26
申请号:US09932911
申请日:2001-08-20
IPC分类号: G02B638
CPC分类号: H04B10/2581
摘要: A method and apparatus is provided for connecting an optical source to a multimode optical fibre in a multimode optical fibre communications system. A single mode fibre length is provided such that optical radiation admitted from an optical source at one end of the single mode fibre length is provided to a multimode optical fibre at the other end of the single mode fibre length. This method and apparatus is used in a duplex patchcord for connecting an optical transceiver to a pair of installed multimode fibres. The second fibre in the patchcord is a multimode fibre for passing optical signals to the optical receiver of the transceiver.
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