-
公开(公告)号：US5245404A
公开(公告)日：1993-09-14
申请号：US599816
申请日：1990-10-18
摘要： A multiwavelength sensor for sensing light scattered from a scattering medium includes a light source, a uniform broadband reflection grating at the Littrow position, a fiber, and a detector. Light from the source is incident on the grating, which diffracts the light. The fiber has a first end into which the light diffracted from the grating is received and has a second end from which the light exits, the fiber being positioned so that the light is incident upon and scattered from the scattering medium. At least some of the light scattered from the medium is scattered back into the second end and out of the first end and incident upon the diffraction grating. Light out of the first end and diffracted from the grating is incident on the detector. The system is fully transparent so that light traveling toward the second end and light traveling back toward the first end are optically isolated and cross-talk is substantially nonexistent.
摘要翻译： 用于感测从散射介质散射的光的多波长传感器包括光源，在Littrow位置处的均匀宽带反射光栅，光纤和检测器。 来自光源的光入射到光栅上，其衍射光。 光纤具有从光栅衍射的光被接收的第一端，并且具有第二端，光从该第二端射出，光纤定位成使得光从散射介质入射并散射。 从介质散射的至少一些光被散射回第二端并离开第一端并入射到衍射光栅上。 第一端的光从光栅衍射入射到检测器上。 该系统是完全透明的，使得朝向第二端行进的光和朝向第一端行进的光是光隔离的，并且串扰基本上不存在。
-
公开(公告)号：US5278687A
公开(公告)日：1994-01-11
申请号：US681128
申请日：1991-04-05
摘要： An optical multi-channel data communication link transmits data from a transmitter to a remote receiver. The link includes a multimode laser diode source connected to the transmitter, a device for modulating the source with each channel of data to generate a modulated light wave, and a wavelength division multiplexing device at the transmitter. The wavelength division multiplexing device has paraxial optics for multiplexing the light waves to produce a multiplexed signal. Multimode fiber optic means are connected to the multiplexer and pass the multiplexed signal to the remote receiver. A wavelength division multiplexer has paraxial optics for demultiplexing the multiplexed signals at the receiver to produce demultiplexed light waves. Each of the demultiplexed light waves are converted for use by the receiver. Preferably, each of the wavelength division multiplexer and demultiplexer has a littrow reflecting grating and a lens which are paraxially aligned with the multimode fiber optic means to provide channel separation of less than 50 nm.
摘要翻译： 光学多通道数据通信链路将数据从发射机发射到远程接收机。 该链路包括连接到发射机的多模激光二极管源，用于利用每个数据通道调制源的装置以产生调制的光波，以及在发射器处的波分复用装置。 波分复用装置具有用于多路复用光波以产生复用信号的近轴光学器件。 多模光纤装置连接到多路复用器，并将复用的信号传递给远程接收器。 波分复用器具有近轴光学器件，用于在接收器处对多路复用信号进行解复用以产生解复用的光波。 每个解复用的光波被转换以供接收机使用。 优选地，波分多路复用器和解复用器中的每一个具有随机反射光栅和与多模光纤装置对准的透镜，以提供小于50nm的通道间隔。
-
公开(公告)号：US4784453A
公开(公告)日：1988-11-15
申请号：US9848
申请日：1987-02-02
申请人： H. John Shaw , Behzad M. R. Moslehi
发明人： H. John Shaw , Behzad M. R. Moslehi
CPC分类号： G01D5/35383
摘要： A ladder architecture comprises an input optical fiber bus and an output optical fiber bus. A plurality of input optical couplers couple light between the input bus and a plurality of branching fibers. A plurality of output couplers couple light from the branching fibers to the output bus. The input bus and the branch fibers may be single mode optical fibers while the output bus a multimode optical fiber. The input couplers may be symmetrical, single mode devices, and the output couplers may be asymmetrical and single mode to multimode devices. The input bus may also be a multimode fiber, and the input couplers may also be multimode to single mode devices. The asymmetrical coupling reduces the amount of signal lost at fiber ends.
-
公开(公告)号：US4768850A
公开(公告)日：1988-09-06
申请号：US622637
申请日：1984-06-20
CPC分类号： H04L25/03057 , G02B6/2861
摘要： A fibre optic lattice filter having a transfer function wherein the poles and zeros are adjustable independently of each other. The filter comprises a cascaded configuration of recursive and non-recursive fiber optic lattice filters. In one preferred embodiment, an all-pass fiber optic filter is formed by cascading all-pole and all-zero lattice filters, and by processing the resulting filtered output signal in a subtractive detection system. This detection system produces a signal which represents the difference between two signal outputs provided by the all-zero filter section, and which is adjustable in magnitude, thereby providing an overall filtering function which is capable of handling both positive and negative valued input signals.
摘要翻译： 一种具有传递函数的光纤格栅滤波器，其中极点和零点彼此独立地调节。 滤波器包括递归和非递归光纤网格滤波器的级联配置。 在一个优选实施例中，全通光纤滤波器通过级联全极点和全零点阵滤波器，并通过在减法检测系统中处理所得到的滤波输出信号来形成。 该检测系统产生一个信号，该信号表示由全零滤波器部分提供的两个信号输出之间的差异，其可在幅度上调节，从而提供能够处理正值和负值输入信号的整体滤波功能。
-
公开(公告)号：US4778239A
公开(公告)日：1988-10-18
申请号：US9967
申请日：1987-02-02
申请人： H. John Shaw , Behzad M. R. Moslehi
发明人： H. John Shaw , Behzad M. R. Moslehi
CPC分类号： G01D5/35383 , G02B6/2817 , G02B6/2861 , G06E3/001
摘要： A lattice includes a transmit bus formed of a single mode optical fiber and a return bus formed of a multimode optical fiber. An optical transmitter applies input signals to the transmit bus, and an optical receiver receives the signals guided by the return bus. The return fiber is looped around the couplers so that the signal output from each segment of the lattice passes through all the preceding segments before reaching the receiver. The optical couplers have asymmetric coupling efficiencies so that recirculating light is attenuated.
-
-
-
-
搜索结果
5 条记录 (耗时 0.023 秒)
