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公开(公告)号：US5074633A
公开(公告)日：1991-12-24
申请号：US562768
申请日：1990-08-03
CPC分类号： G02B6/2551 , H01S3/06708 , H01S3/06745
摘要： Disclosed is an optical communication system comprising at least two optical fibers of dissimilar core sizes, joined by a fusion splice. In one embodiment, the larger-core fiber is a communication fiber, and the smaller-core fiber is an erbium-doped amplifier fiber. A taper region is included adjacent the splice. The diameter of the smaller-core fiber increases within the taper region as the splice is approached along the smaller-core fiber. The taper region is substantially free of constrictions. As a consequence of the taper region, the optical losses associated with the splice are relatively low, even when there is relatively high mismatch between the mode field diameters (at a signal wavelength) in the respective fibers.
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公开(公告)号：US5309534A
公开(公告)日：1994-05-03
申请号：US21702
申请日：1993-02-24
CPC分类号： G02B6/12007 , G02B6/29355
摘要： We describe an interferometric, channel-dropping, optical filter that includes a pair of planar waveguides. The two waveguides are spaced apart by a distance which is periodically varied along the longitudinal axis of the filter in order to effect a periodic optical coupling between them. There are at least three coupling locations, each associated with a coupling constant. The two waveguides have nominally equal effective refractive indices. In preferred embodiments of the invention, the coupling constants decrease symmetrically from the center of the filter toward the ends.
摘要翻译： 我们描述一种包括一对平面波导的干涉式，通道丢弃的滤光器。 两个波导间隔开沿着滤波器的纵向轴线周期性变化的距离，以便实现它们之间的周期性光耦合。 存在至少三个耦合位置，每个耦合位置与耦合常数相关联。 两个波导具有相等的有效折射率。 在本发明的优选实施例中，耦合常数从过滤器的中心向端部对称地减小。
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3.发明授权
公开(公告)号：US4974930A
公开(公告)日：1990-12-04
申请号：US434146
申请日：1989-11-13
IPC分类号： G02B6/14
CPC分类号： G02B6/14 , G02B6/021 , G02B6/02133 , G02B6/02114
摘要： A mode scrambling arrangement for a multimode optical fiber by irradiating the cladding using an ultra-violet light to change the index of refraction of the cladding. The cladding uses a material whose index of refraction is modified in response to ultra-violet light. The exposure time and intensity of the light required is determined by monitoring the mode pattern in the multimode fiber during the irradiation to provide the desired amount of mode scrambling.
摘要翻译： 一种用于多模光纤的模式加扰装置，其通过使用紫外光照射包层以改变包层的折射率。 包层使用其折射率响应于紫外线而被修改的材料。 所需的光的曝光时间和强度通过在照射期间监测多模光纤中的模式图案来确定，以提供所需量的模式加扰。
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公开(公告)号：US4435040A
公开(公告)日：1984-03-06
申请号：US299213
申请日：1981-09-03
申请人： Leonard G. Cohen , Wanda L. Mammel
发明人： Leonard G. Cohen , Wanda L. Mammel
CPC分类号： G02B6/02223 , C03C13/045 , G02B6/03627 , G02B6/03644 , G02B6/03655 , G02B6/03611
摘要： The invention pertains to W-profile single-mode silica-based optical fiberguide, and to communication systems employing these fiberguide. Such guides can be designed to have large bandwidth over a wide wavelength region, and, in particular, to have minimal chromatic dispersion at two different wavelengths, e.g., about 1.3 .mu.m and about 1.55 .mu.m, the wavelengths of loss minima in silica. Disclosed are ranges of fiber parameters that can yield these and other advantageous fiberguide characteristics. In particular, in fibers according to the invention the difference between core and outer cladding refractive index is between about 0.1% and 0.4% of the outer cladding index, the difference between the inner cladding and the outer cladding index is between about 1 times and about 3 times the difference between core and outer cladding, the core radius is between about 0.5 and 0.8 times the outer radius of the inner cladding, and the outer radius of the inner cladding is at least about 5 .mu.m. Any suitable dopant, e.g., fluorine, germanium, boron or phosphorus, can be used. In preferred embodiments, the core is undoped SiO.sub.2, or lightly Ge-doped SiO.sub.2, and the two clads are fluorine-doped.
摘要翻译： 本发明涉及W型单模二氧化硅光导纤维，以及采用这些光导纤维的通信系统。 这样的引导件可以被设计成在宽波长区域具有大的带宽，并且特别地，在两个不同波长（例如约1.3μm和约1.55μm）处具有最小的色散，即二氧化硅中损失最小的波长。 所公开的纤维参数的范围可以产生这些和其他有利的纤维导向器特性。 特别地，在根据本发明的纤维中，芯和外包层折射率之间的差异在外包层指数的约0.1％至0.4％之间，内包层和外包层指数之间的差异在约1倍和约2倍之间 芯包层与外包层之间的差为3倍，纤芯半径在内包层的外半径的约0.5至0.8倍之间，内包层的外半径至少约为5微米。 可以使用任何合适的掺杂剂，例如氟，锗，硼或磷。 在优选的实施方案中，芯是未掺杂的SiO 2或轻掺杂Ge的SiO 2，并且两个包层是氟掺杂的。
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公开(公告)号：US5699176A
公开(公告)日：1997-12-16
申请号：US554332
申请日：1995-11-06
申请人： Leonard G. Cohen
发明人： Leonard G. Cohen
CPC分类号： G02B6/12007 , H04B10/272 , H04Q11/0067 , G02B6/2861 , H04Q11/0071 , H04Q2011/0083 , H04Q2011/009
摘要： A fiber-coax network (30) includes feeder fiber (14) from a central office/headend (10) to a distribution node (32). At the distribution node, the transmissions are routed and distributed via successively a cable-coax node (16), a first PON node (36), and a second PON node (84). Each PON node comprises one or more passive optic component such as an optic splitter or wavelength division multiplexer (WDM). The cable-coax node provides broadcast CATV to subscribers via a coax distribution network (18) having spaced line extension amplifiers (LEAs) (26) in order to service more subscribers. The first PON node (36) provides switched telecommunication services (including ISDN) to subscribers via distribution fibers (38) which terminate at respective optic network units (ONUs) (40) that are co-located with an LEA (26) and connect to the coax distribution network downstream of the LEA (26). The second PON node (84) provides wireless services (including PCS) to subscribers within a predefined geographic area referred to as a microcell (82) via distribution fibers (86) which terminate at respective lightwave microcell transceivers (88) co-located with an LEA (26) and ONU (40). The co-located LEAs (20), ONUs (40), and LMTs are housed in a common multimedia enclosure (94). Further, the health of the network is monitored with fiber sensor loops (52, 62).
摘要翻译： 光纤同轴网络（30）包括从中心局/前端（10）到分配节点（32）的馈线光纤（14）。 在分发节点处，经由连续的电缆同轴节点（16），第一PON节点（36）和第二PON节点（84）路由和分配传输。 每个PON节点包括一个或多个无源光学部件，例如光分路器或波分复用器（WDM）。 电缆同轴节点通过具有间隔线路扩展放大器（LEA）（26）的同轴电缆分配网络（18）向用户提供广播CATV，以便服务更多的用户。 第一PON节点（36）通过分配光纤（38）向订户提供交换电信业务（包括ISDN），终止于与LEA（26）共同定位的相应光网络单元（ONU）（40），并连接到 LEA下游的同轴电缆分销网络（26）。 第二PON节点（84）经由分配光纤（86）向预定义的称为微小区（82）的预定义地理区域内的用户提供无线服务（包括PCS），所述分配光纤终止于与位于其上的相应光波微蜂窝收发器（88） LEA（26）和ONU（40）。 共同的LEA（20），ONU（40）和LMT被容纳在公共多媒体外壳（94）中。 此外，利用光纤传感器环路（52,62）监视网络的健康状况。
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公开(公告)号：US5046800A
公开(公告)日：1991-09-10
申请号：US594775
申请日：1990-10-09
CPC分类号： G02B6/13
摘要： Disclosed is a planar optical waveguide that is manufacturable by the compression molding or embossing of a multilayer film of polymeric material. In one embodiment, the waveguide comprises a core layer of relatively high refractive index included between cladding layers of lower refractive index. The waveguiding channels are bounded by regions where the cladding layers are in contact and from which core material has been excluded.
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公开(公告)号：US4447127A
公开(公告)日：1984-05-08
申请号：US367094
申请日：1982-04-09
CPC分类号： G02B6/03627
摘要： In a double-clad, single mode fiber with depressed inner cladding, reduced losses at the longer wavelengths are realized when the ratio of the radius of the inner cladding to the radius of the core is at least 6.5 to 1.
摘要翻译： 在具有凹陷的内包层的双包层单模光纤中，当内包层的半径与芯的半径的比率至少为6.5比1时，实现较长波长处的损耗减小。
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公开(公告)号：US5329392A
公开(公告)日：1994-07-12
申请号：US33912
申请日：1993-03-19
申请人： Leonard G. Cohen
发明人： Leonard G. Cohen
CPC分类号： H04Q11/0062 , G01M11/3154 , H04B10/071 , H04Q2011/0015 , H04Q2011/0016 , H04Q2011/0083
摘要： An optical communication network includes a fiber-optic terminal system (FOTS) coupled to internal optical waveguides (or fibers) situated within a central office or terminal. These waveguides connect to external optical fibers. A new component is provided for optically coupling the FOTS to the waveguides. This component includes planar waveguides, referred to as "main waveguides" formed on a substrate. Each main waveguide is coupled at one end to the FOTS and at the other end to an internal waveguide. Monitor waveguides, also formed on the substrate, are used to transmit OTDR signals to the main waveguides. Wavelength-division multiplexers formed on the substrate are used to couple monitor waveguides to corresponding main waveguides with respect to monitor wavelengths but not with respect to signal wavelengths.
摘要翻译： 光通信网络包括耦合到位于中心局或终端内的内部光波导（或光纤）的光纤终端系统（FOTS）。 这些波导连接到外部光纤。 提供了一种用于将FOTS光学耦合到波导的新部件。 该部件包括在基板上形成的称为“主波导”的平面波导。 每个主波导的一端耦合到FOTS，另一端耦合到内部波导。 也在衬底上形成的监测波导用于将OTDR信号传输到主波导。 形成在衬底上的波分复用器用于将监视器波导相对于监视波长耦合到相应的主波导，而不是相对于信号波长耦合。
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公开(公告)号：US5321541A
公开(公告)日：1994-06-14
申请号：US857365
申请日：1992-03-25
申请人： Leonard G. Cohen
发明人： Leonard G. Cohen
IPC分类号： H04B10/02 , H04B10/08 , H04B10/20 , H04B10/207 , H04B10/213 , H04M3/00 , H04Q3/52 , H04Q11/04 , H04J14/02
CPC分类号： H04B10/079 , H04B10/038 , H04B10/071 , H04B10/077 , H04B10/0773 , H04B10/0775 , H04B10/0779 , H04B10/0799 , H04B10/272 , H04J14/0221 , H04J14/0227 , H04B2210/071 , H04B2210/077
摘要： An optical communication network includes at least one single-mode fiber, referred to as a "primary fiber," for transmission between a central office and a distribution node, and at least one multiplicity of single-mode fibers, referred to as "distribution fibers," for transmission between the distribution node and a multiplicity of optical network units (ONUs). Transmissions are exchanged between the primary and distribution fibers via at least one optical coupler located at the distribution node. The network is passive in the sense that all monitoring of the transmission media and the ONUs can be performed at the central office, without active intervention at remote locations. The network includes a monitor and a multiplicity of bypass lines by means of which at least a portion of inbound signals from the distribution fibers are transmitted to the monitor without passing through the optical coupler at the distribution node.
摘要翻译： 光通信网络包括至少一个称为“主光纤”的单模光纤，用于在中心局和分布节点之间传输，以及至少一个单模光纤，称为“分布光纤 ，“用于分发节点和多个光网络单元（ONU）之间的传输。 传输通过位于分布节点处的至少一个光耦合器在主光纤和分布光纤之间交换。 网络是被动的，在传输媒体和ONU的所有监控都可以在中心局执行，而不需要在远程位置进行主动干预。 网络包括监视器和多条旁路线路，通过该线路将来自分配光纤的入站信号的至少一部分传输到监视器，而不通过分布节点处的光耦合器。
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公开(公告)号：US4691990A
公开(公告)日：1987-09-08
申请号：US670280
申请日：1984-11-13
CPC分类号： G02B6/03627 , G02B6/0288 , G02B6/03611
摘要： Single mode and multimode silica-based optical fibers having a down-doped outer cladding are disclosed. The outer cladding material is derived from a preexisting silica tube that comprises an amount of index-lowering dopant, typically F or B, sufficient to result in an effective refractive index of the material that is at least about 0.001, preferably at least 0.0025, lower than the refractive index of SiO.sub.2. Single mode optical fiber according to the invention typically requires a smaller amount of deposited cladding material than an equivalent prior art fiber, and thus can be produced more economically. Multimode optical fiber according to the invention may have lower core doping or higher NA than equivalent prior art fiber. Down-doped substrate or sleeve tubes advantageously are produced by a gel process.
摘要翻译： 公开了具有下掺杂外包层的单模和多模二氧化硅基光纤。 外包层材料衍生自预先存在的二氧化硅管，其包含一定量的折射率降低掺杂剂，通常为F或B，足以导致材料的有效折射率为至少约0.001，优选至少0.0025，较低 比SiO 2的折射率。 根据本发明的单模光纤通常需要比等效的现有技术光纤更少的沉积包层材料，因此可以更经济地制造。 根据本发明的多模光纤可以具有比等效的现有技术光纤更低的芯掺杂或更高的NA。 下掺杂衬底或套筒管有利地通过凝胶法制备。
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