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1. 发明授权

US5712937A Optical waveguide including singlemode waveguide channels coupled to a multimode fiber 失效
公开(公告)号：US5712937A
公开(公告)日：1998-01-27
申请号：US347947
申请日：1994-12-01
申请人： Charles K. Asawa , Mike H. Asawa , Jane K. Asawa , Michi Asawa
发明人： Charles K. Asawa , Mike H. Asawa , Jane K. Asawa , Michi Asawa
IPC分类号： G02B6/12 , G02B6/125 , G02B6/14 , G02B6/30 , H04B10/2581 , G02B6/28
CPC分类号： H04B10/2581 , G02B6/12007 , G02B6/125 , G02B6/14 , G02B6/30
摘要： An intrusion-alarmed optical fiber communication system, where light from two or more sources are launched with a planar channel waveguide launcher into two or more modes of a multimode graded-index transmission fiber, is disclosed. Input fibers containing the source light waves and the output fibers are in direct contact with the waveguide channels. Waveguide channels redistribute the light from input channels to output channels by rerouting, crossing, merging, or splitting channels. Waveguide launcher precisely launches data light into the fundamental mode and intrusion monitor light into high order modes of a multimode graded-index fiber. Fiber intrusion attenuates light in high order modes, but much less of the data in the fundamental mode, thereby forming a basis for the intrusion-alarmed system. Waveguide launcher permits light from a plurality of sources to be launched selectively into several types of fibers: singlemode fibers, multimode fibers, multicore fibers, multimode fibers having high refractive-index ring profile within the fiber core boundary. Waveguide channel configuration permit other versatile functions to be performed; these include optical time domain reflectometry, channel feedback stabilization of the diodes, launching light from more than one light source into the fundamental mode of a multimode graded-index fiber, and other functions. Means for launching and propagating the fundamental mode in multimode graded-index fiber in order to increase bandwidth capacity of said fiber are disclosed. Optical-electronic intrusion-alarmed systems with synchronous phase sensitive detection of intrusion are described, including reference recovery means. In order to decrease false alarm rates, information on transmitter light source variations are transmitted to the receiver via digital bit stream. A precise fiber optic sensor system based on the waveguide launcher is disclosed.

2. 发明授权

US06185346B2 Propagation in lowest order modes of multimode graded index fiber, resulting in: very low transmission loss, low modal noise, high data security, and high data rate capabilities 失效
标题翻译：在多模渐变折射率光纤的最低阶模式下传播，导致：传输损耗非常低，模态噪声低，数据安全性高，数据速率高
公开(公告)号：US06185346B2
公开(公告)日：2001-02-06
申请号：US09205436
申请日：1998-12-04
申请人： Charles K. Asawa , Jane K. Asawa , Mike H. Asawa
发明人： Charles K. Asawa , Jane K. Asawa , Mike H. Asawa
IPC分类号： G02B626
CPC分类号： H04B10/2581 , G02B6/14 , G02B6/262 , G02B6/30
摘要： This invention relates to optical fiber communication systems where data light is launched into a very small set of the lowest order propagation modes of multimode graded-index fibers, resulting in very high data rate transmission capability. We have determined, experimentally and theoretically, that light launched into a small set of a few lowest order propagation modes, or launched only into the fundamental propagation mode of multimode graded-index fiber, converts into and within a limited small set of lowest order modes due to severe bending perturbations that may occur in deployed multimode graded-index fiber transmission cable. Low modal time dispersion of the limited small set of lowest order modes is much less than when all modes of the multimode graded-index fiber are launched, yielding a much higher data rate transmission capability. Added advantages are: low transmission loss, low modal noise, and data security. Methods for launching the small set of lowest order propagation modes or the fundamental propagation modes into a single multimode graded-index fiber or into a plurality of multimode fibers in other optical fiber communication networks are described.
摘要翻译：本发明涉及光纤通信系统，其中将数据光发射到多模渐变折射率光纤的最低阶传播模式的非常小的集合中，导致非常高的数据速率传输能力。我们已经在实验和理论上确定了将光发射到一小组最低阶传播模式中，或仅发射到多模渐变折射率光纤的基本传播模式，转换成有限的一小组最低阶模式由于在部署的多模分级折射率光纤传输电缆中可能发生严重的弯曲扰动。有限小组最低阶模式的低模态时间色散远小于多模式渐变折射率光纤的所有模式启动时产生高得多的数据传输能力。增加的优点是：低传输损耗，低模态噪声和数据安全性。描述了将小组最低阶传播模式或基本传播模式发射到单个多模渐变折射率光纤或其它光纤通信网络中的多个多模光纤中的方法。

3. 发明授权

US06487338B2 Profile matching fiber patchcord for fundamental mode excitation in graded-index multimode fiber 失效
标题翻译：配置匹配光纤跳线用于渐变折射率多模光纤中的基模激励
公开(公告)号：US06487338B2
公开(公告)日：2002-11-26
申请号：US09801555
申请日：2001-03-07
申请人： Charles K. Asawa , Jane K. Asawa , Mike H. Asawa
发明人： Charles K. Asawa , Jane K. Asawa , Mike H. Asawa
IPC分类号： G02B626
CPC分类号： H04B10/2581 , G02B6/14 , G02B6/262 , G02B6/4206 , G02B6/421
摘要： This invention relates to optical fiber systems where light is launched into and propagated in the fundamental mode of graded-index multimode fiber. Generally, it is not possible to launch light exclusively into the fundamental mode of graded-index multimode fiber by butt-coupling the multimode fiber to an arbitrary fiber carrying light from a source; several other modes may be launched. By inserting a length of a special singlemode fiber between an arbitrary fiber carrying light from a source and the graded-index multimode fiber, light can be launched exclusively into the fundamental mode of the graded-index multimode fiber. The special singlemode fiber has a modal pattern that matches the fundamental Gaussian modal pattern of the graded-index multimode fiber, which permits launching of the light into only the fundamental mode of the multimode fiber. Several applications for propagation in the fundamental mode of graded-index multimode fiber arises. These include: fiber optic sensor systems, high data rate communication links, low modal noise links, high security links, etc.
摘要翻译：本发明涉及光纤系统，其中光线在渐变折射率多模光纤的基本模式下发射并传播。通常，不可能通过将多模光纤对接到携带来自光源的光的任意光纤而将光专门发射到渐变折射率多模光纤的基本模式; 可能会启动其他几种模式。通过在来自源的光的任意光纤与渐变折射率多模光纤之间插入一段特殊的单模光纤，光可以专门发射到渐变折射率多模光纤的基本模式。特殊的单模光纤具有与渐变折射率多模光纤的基本高斯模态图案相匹配的模态图案，其允许将光仅发射到多模光纤的基本模式。出现了在渐变折射率多模光纤的基本模式下传播的几种应用。这些包括：光纤传感器系统，高数据速率通信链路，低模态噪声链路，高安全链路等

4. 发明授权

US5818986A Angular Bragg reflection planar channel waveguide wavelength demultiplexer 失效
标题翻译：角布拉格反射平面波导波导解复用器
公开(公告)号：US5818986A
公开(公告)日：1998-10-06
申请号：US729852
申请日：1996-10-15
申请人： Charles K. Asawa , Mike H. Asawa , Jane K. Asawa
发明人： Charles K. Asawa , Mike H. Asawa , Jane K. Asawa
IPC分类号： G02B6/12 , G02B6/26
CPC分类号： G02B6/12007
摘要： An optical planar waveguide wavelength division demultiplexer for separating multiple wavelengths received in a wavelength division multiplexed communication system is disclosed, with each wavelength launched into a separate output waveguide channel. Wavelength separation is performed by wavelength-selective angular back-reflection from Bragg gratings, which are fabricated into the channel junctions of the planar germania-enriched silica waveguide by applying short wavelength light past a mask. A second Bragg reflection, reflecting the same wavelength as the first Bragg grating, is introduced into each output channel circuit, in order to attenuate residual backscattered light at non-desired wavelengths. The Bragg grating is extended beyond the channel junctions into the merged channel for greater reflectivity, if required, for the double Bragg grating geometry. Two planar waveguide geometries are shown: An asymmetric geometry where the output channels merge on either side of a straight input channel, and a symmetric geometry where the input and output channels merge symmetrically with respect to an arbitrary center line.
摘要翻译：公开了一种用于分离在波分复用通信系统中接收的多个波长的光学平面波导波分解复用器，其中每个波长发射到单独的输出波导信道中。通过从布拉格光栅的波长选择性角度背反射来进行波长分离，其通过将短波长光通过掩模制成平面富含氧化锗的石英波导的通道结。反射与第一布拉格光栅相同的波长的第二布拉格反射被引入到每个输出通道电路中，以便以非期望的波长衰减残留的后向散射光。如果需要，布拉格光栅延伸超过通道结到合并通道，以获得双布拉格光栅几何形状的更大反射率。示出了两个平面波导几何形状：其中输出通道在直线输入通道的任一侧上合并的对称几何形状，以及对称几何形状，其中输入和输出通道相对于任意中心线对称地合并。

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