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1. 发明授权

US06977763B1 Free-space optical isolator with integrated quarter-wave plate 有权
标题翻译：具有集成四分之一波片的自由空间光隔离器
公开(公告)号：US06977763B1
公开(公告)日：2005-12-20
申请号：US10701674
申请日：2003-11-05
申请人： Steve Wang , Mingkun Shi , Frank H. Levinson , Tengda Du
发明人： Steve Wang , Mingkun Shi , Frank H. Levinson , Tengda Du
IPC分类号： G02B26/00 , G02B27/28 , G02F1/03
CPC分类号： G02B27/286 , G02B27/288
摘要： The present invention provides low cost methods and apparatuses for filtering out polarized light reflections in a free-space optical isolator. In one embodiment, a laser directs a non-polarized optical signal through a series of polarizers and rotators in order to isolate an optical signal having a specific polarization. The present invention also includes a quarter-wave plate placed in series with the rotators and polarizers, to help filter away reflections occurring while the signal passes through free space. The inclusion of the quarter-wave plate helps filter away a greater amount of near-end reflections from going back to the laser, even with the use of low cost polarizers. Accordingly, the present invention can polarize an optical signal more efficiently than with prior methods, and at a much lower cost.
摘要翻译：本发明提供了用于过滤自由空间光隔离器中的偏振光反射的低成本方法和装置。在一个实施例中，激光器通过一系列偏振器和旋转器引导非偏振光信号，以隔离具有特定极化的光信号。本发明还包括与旋转器和偏振器串联布置的四分之一波片，以帮助滤除信号通过自由空间时发生的反射。包括四分之一波片有助于滤除更大量的近端反射回到激光，即使使用低成本的偏振器。因此，本发明可以比现有方法更有效地偏振光学信号，并且成本低得多。

2. 发明授权

US07196744B1 Optical transceiver package with a liquid crystal variable optical attenuator 有权
标题翻译：光收发器封装，带有液晶可变光衰减器
公开(公告)号：US07196744B1
公开(公告)日：2007-03-27
申请号：US10688375
申请日：2003-10-17
申请人： William Freeman , Steve Wang , Frank H. Levinson
发明人： William Freeman , Steve Wang , Frank H. Levinson
IPC分类号： G02F1/1335 , G02F1/13
CPC分类号： G02F1/133528 , G02F1/093 , G02F2203/48
摘要： A liquid crystal optical attenuator is provided that is used to control the intensity of a light signal. The optical attenuator includes at least one polarizing element having an optical polarization axis, wherein the polarizing element transmits a portion of a light signal proportional to the angular difference between the optical polarization axis of the light signal and that of the polarizing element. The optical attenuator also comprises a variable liquid crystal rotator that includes a semi-transparent liquid crystal device, and a plurality of electrodes configured to conduct electricity to the liquid crystal device. The polarization axis of the light signal transmitted through the liquid crystal device will be rotated by an amount proportional to the magnitude of the electricity applied to the plurality of electrodes. In one embodiment, the optical attenuator is employed as part of a laser package that includes a laser, a pair of polarizing elements, and a faraday rotator.
摘要翻译：提供了一种用于控制光信号强度的液晶光衰减器。光衰减器包括至少一个具有光偏振轴的偏振元件，其中偏振元件透射与光信号的光偏振轴和偏振元件的光偏振轴成比例的光信号的一部分。光衰减器还包括可变液晶旋转器，其包括半透明液晶装置和多个电极，其被配置为将电能传导到液晶装置。通过液晶装置传输的光信号的偏振轴将旋转与施加到多个电极的电力的大小成比例的量。在一个实施例中，光衰减器被用作包括激光器，一对偏振元件和法拉第旋转器的激光器封装的一部分。

3. 发明授权

US07170921B1 Magneto-optic variable optical attenuator 有权
标题翻译：磁光可变光衰减器
公开(公告)号：US07170921B1
公开(公告)日：2007-01-30
申请号：US10688364
申请日：2003-10-17
申请人： William Freeman , Steve Wang , Frank H. Levinson
发明人： William Freeman , Steve Wang , Frank H. Levinson
IPC分类号： H01S3/08 , G02F1/09
CPC分类号： G02F1/09 , G02F1/093 , G02F2201/16 , G02F2203/48 , H01S3/005 , H01S5/005
摘要： A magneto-optic variable optical attenuator is provided that is used to control the intensity of a light signal. The optical attenuator includes at least one polarizing element having an optical polarization axis, wherein the polarizing element transmits a portion of an incident light signal proportional to the angular difference between an optical polarization axis of the incident light signal and that of the polarizing element. The optical attenuator also comprises a variable faraday rotator that includes a semi-transparent material, a magnetic material for applying a magnetic force to a light signal that is passed through the semi-transparent material, and a conductive wire configured to induce a magnetic field on the magnetic material. In various embodiments, the optical attenuator is employed as part of a laser package that includes a laser light source and a plurality of polarizing elements, which are in optical communication with a faraday rotator and/or a variable faraday rotator.
摘要翻译：提供了用于控制光信号强度的磁光可变光衰减器。光衰减器包括至少一个具有光偏振轴的偏振元件，其中偏振元件透射与入射光信号的偏振光轴与偏振元件的偏振光轴之间的角度差成比例的入射光信号的一部分。光衰减器还包括可变法拉第旋转器，其包括半透明材料，用于向通过半透明材料的光信号施加磁力的磁性材料，以及被配置为引导磁场的导线磁性材料。在各种实施例中，光衰减器被用作包括与法拉第旋转器和/或可变法拉第旋转器光学连通的激光光源和多个偏振元件的激光器封装的一部分。

4. 发明授权

US06882764B1 Polarization independent packaging for polarization sensitive optical waveguide amplifier 有权
标题翻译：极化灵敏光波导放大器的极化独立封装
公开(公告)号：US06882764B1
公开(公告)日：2005-04-19
申请号：US10646422
申请日：2003-08-22
申请人： Qi Deng , Steve Wang , Frank H. Levinson
发明人： Qi Deng , Steve Wang , Frank H. Levinson
IPC分类号： G02B6/125 , G02B6/34 , H01S3/063 , G02B6/12 , H01S3/07
CPC分类号： G02B6/2713 , G02B6/125 , G02B6/2766 , H01S3/063
摘要： A waveguide optical amplifier package has a circulator and a planar waveguide amplifier optically communicating with the circulator. A core of the circulator receives an input beam, separates the input beam into a first beam and a second beam, and manipulates the first beam and the second beam so that they have the same polarization as they enter the waveguide. The waveguide includes one waveguide for each beam or a single waveguide that receives both beams. Following amplification of the beams power levels, the beams are directed into the circulator which combines the beams into an output beam that exits the circulator.
摘要翻译：波导光放大器封装具有循环器和与循环器光学连通的平面波导放大器。循环器的核心接收输入光束，将输入光束分离成第一光束和第二光束，并且操纵第一光束和第二光束，使得它们在进入波导时具有相同的偏振。波导包括用于每个波束的一个波导或接收两个波束的单个波导。在放大光束功率电平之后，光束被引导到环形器中，其将光束组合成离开循环器的输出光束。

5. 发明授权

US07042628B1 Variable electrochromic optical attenuator 失效
标题翻译：可变电致变色光衰减器
公开(公告)号：US07042628B1
公开(公告)日：2006-05-09
申请号：US10688356
申请日：2003-10-17
申请人： William Freeman , Steve Wang , Frank H. Levinson
发明人： William Freeman , Steve Wang , Frank H. Levinson
IPC分类号： G02F1/00
CPC分类号： G02F1/153 , G02F2203/48
摘要： A variable electrochromic optical attenuator is provided that is used to control the intensity of a light signal. The electrochromic optical attenuator comprises a semi-transparent electrochromic device, and a plurality of electrodes configured to conduct electricity to the electrochromic device such that the transparency of the electrochromic device will be affected by an amount proportional to the magnitude of the electricity applied to the plurality of electrodes. The intensity of the light signal transmitted through the electrochromic device is affected by an amount proportional to the magnitude of the electricity applied to the plurality of electrodes. The electrochromic optical attenuator also includes at least one polarizing element having an optical polarization axis, wherein the polarizing element transmits a portion of the light signal proportional to the angular difference between the optical polarization axis of the light signal and that of the polarizing element. In one embodiment, the electrochromic optical attenuator is employed in a laser package that includes a laser, a pair of polarizing elements, and a faraday rotator.
摘要翻译：提供了用于控制光信号强度的可变电致变色光衰减器。电致变色光衰减器包括半透明电致变色器件和多个电极，其被配置为将电能传导到电致变色器件，使得电致变色器件的透明度将受到与施加到多个器件的电力的大小成正比的量的影响的电极。通过电致变色装置传输的光信号的强度受到与施加到多个电极的电力的大小成比例的量的影响。电致变色光衰减器还包括具有光偏振轴的至少一个偏振元件，其中偏振元件透射与光信号的光偏振轴与偏振元件的光偏振轴成比例的光信号的一部分。在一个实施例中，电致变色光衰减器用于包括激光器，一对偏振元件和法拉第旋转器的激光器封装中。

6. 发明授权

US07778554B2 System and method for transmitting data on return path of a cable television system 有权
标题翻译：用于在有线电视系统的返回路径上发送数据的系统和方法
公开(公告)号：US07778554B2
公开(公告)日：2010-08-17
申请号：US11838165
申请日：2007-08-13
申请人： Frank H. Levinson , Gerald F. Sage , Arthur Michael Lawson , Willem A. Mostert
发明人： Frank H. Levinson , Gerald F. Sage , Arthur Michael Lawson , Willem A. Mostert
IPC分类号： H04B10/06
CPC分类号： H04N21/615 , H04N7/17309 , H04N7/22 , H04N21/6168
摘要： An optical signal return path system includes a transmitter and a receiver. The receiver receives an optical data signal from the transmitter and recovers therefrom a digital data stream and an associated first clock having an associated first clock rate. The data stream is stored in a memory device at the first clock rate. A clock generator generates a second clock having an associated second clock rate that is adjusted in accordance with a clock control signal. A control circuit reads data from the memory device at a rate corresponding to the second clock rate and generates a fullness signal that indicates whether the memory device is fuller more full than a predefined threshold fullness level. A clock speed adjusting circuit generates the clock control signal in accordance with the fullness signal.
摘要翻译：光信号返回路径系统包括发射机和接收机。接收机从发射机接收光学数据信号并从其中恢复数字数据流和相关联的第一时钟具有相关联的第一时钟速率。数据流以第一时钟速率存储在存储器件中。时钟发生器产生具有根据时钟控制信号调整的相关联的第二时钟速率的第二时钟。控制电路以对应于第二时钟速率的速率从存储器件读取数据，并产生指示存储器件是否比预定义的阈值充满度级更充满的丰满度信号。时钟速度调节电路根据丰满度信号产生时钟控制信号。

7. 发明授权

US5566171A Multi-mode high speed network switch for node-to-node communication 失效
标题翻译：用于节点到节点通信的多模高速网络交换机
公开(公告)号：US5566171A
公开(公告)日：1996-10-15
申请号：US404873
申请日：1995-03-15
申请人： Frank H. Levinson
发明人： Frank H. Levinson
IPC分类号： H04L12/52 , H04L12/56
CPC分类号： H04L12/52 , H04L49/351 , H04L49/101 , H04L49/205 , H04L49/25 , H04L49/254
摘要： The present invention provides a an improvement in circuit switching for a network comprising a switching apparatus having a plurality of transceivers for interfacing directly with a like plurality of user nodes. Each of the transceivers having a receive and transmit through port for passing data to and from user nodes and a network, said data comprising a connect sequence, a first wait sequence, a routing packet, a second wait sequence, user data, and a disconnect sequence. The switching apparatus further includes means for isolating each transceiver to loop back data when not in use and switching means for directly connecting any pair of transceivers. Finally a switch controller is provided for establishing and prioritizing matrix connections and disconnections, and decoding routing packets. In operation, a requesting node sequentially transmits a connect sequence, routing packet and user data to the network switch assuming node-to-node communication has been established with a target node, whereupon the isolation means loops user data back to the requesting node when the target node is unavailable.
摘要翻译：本发明提供了一种用于网络的电路交换的改进，包括具有多个收发器的交换设备，用于直接与相似的多个用户节点进行接口。每个收发器具有接收和发送通过端口用于向用户节点和网络传递数据，所述数据包括连接序列，第一等待序列，路由分组，第二等待序列，用户数据和断开连接序列。开关装置还包括用于隔离每个收发器以在不使用时回送数据的装置和用于直接连接任何一对收发器的切换装置。最后，提供了一个开关控制器，用于建立矩阵连接和断开的优先顺序，以及解码路由分组。在操作中，请求节点依次将连接序列，路由分组和用户数据发送到网络交换机，假定已经与目标节点建立了节点到节点的通信，因此当隔离装置将用户数据回送到请求节点时目标节点不可用。

8. 发明授权

US5008877A Optical signal recovery for distribution communication system 失效
标题翻译：配电通信系统的光信号恢复
公开(公告)号：US5008877A
公开(公告)日：1991-04-16
申请号：US120308
申请日：1987-11-12
申请人： Frank H. Levinson
发明人： Frank H. Levinson
IPC分类号： H04L7/00 , H04L12/28
CPC分类号： H04L12/28 , H04L7/0008
摘要： A bus receiver communicates with a bus head end transmitter via a communication path different from read and write optical fibers used by a plurality of remote terminals on the bus so that the bus receiver can quickly determine beginning and end of time slots, clock frequency, and signal trigger levels using a minimum amount of bits attached to a front end of each packet in each time slot.
摘要翻译：总线接收器通过与总线上的多个远程终端所使用的读写光纤不同的通信路径与总线头端发送器通信，使得总线接收器可以快速地确定时隙的开始和结束，时钟频率和信号触发电平使用附加到每个时隙中每个数据包前端的最小数量的位。

9. 发明授权

US4770529A Alignment of optical waveguides 失效
标题翻译：光波导对准
公开(公告)号：US4770529A
公开(公告)日：1988-09-13
申请号：US904750
申请日：1986-09-08
申请人： Frank H. Levinson , Joseph Zucker , Nelson M. Shen , Robert Schlingensiepen
发明人： Frank H. Levinson , Joseph Zucker , Nelson M. Shen , Robert Schlingensiepen
IPC分类号： G01B11/27 , G02B6/38 , G01B11/26
CPC分类号： G01B11/272 , G02B6/3803
摘要： A method of aligning an optical signal source and a waveguide which comprises; directing the signal into the waveguide, monitoring the intensity of the signal backscattered along the waveguide, and altering the relative positions of source and waveguide in response to said intensity.
摘要翻译：一种对准光信号源和波导的方法，包括：将信号引导到波导中，监测沿着波导反向散射的信号的强度，以及响应于所述强度改变源极和波导的相对位置。

10. 发明授权

US4542502A Reconfigurable collision avoiding system, station and protocol for a two path multiple access digital communications system 失效
公开(公告)号：US4542502A
公开(公告)日：1985-09-17
申请号：US567350
申请日：1983-12-30
申请人： Frank H. Levinson , John O. Limb
发明人： Frank H. Levinson , John O. Limb
IPC分类号： H04L12/417 , H04J3/00
CPC分类号： H04L12/42 , H04L12/417
摘要： In order to control the transfer of packets of information among a plurality of stations, e.g., digital computers, the instant communications system, station and protocol contemplate first and second oppositely directed signal paths. At least two stations are coupled to both the first and the second signal paths. A station includes arrangements for reading (and writing) signals from (and on) each of the two paths. Signals are read from either path by an arrangement which electrically precedes the arrangement for writing signals on the path. If the station has a packet to transmit, it can overwrite a busy control field of a packet on either path. Also having read a packet signal from the path, a logical interpretation may be made within the station as to whether the path is busy or is not busy. If the path is not busy, the packet may be written on the path by overwriting any signal thereon. If the path is busy, the station may defer the writing until the path is detected as not busy e.g. by reading a busy control field of another packet. Here the two paths are coupled to form two ring structures so the packets flow down the path to a destination station. Eventually all packets will be transmitted and the busy control field loops around to a station which is designated as a control station. The control station, responsive to detecting that all packets have been transmitted on one of the paths, may transmit a start cycle packet on the one path, responsive to which event a new cycle may be started by initializing each station on the one path and by permitting each initialized station to transmit. In the event of an electrical open, the system, station and protocol are adapted to reconfigure the system so that the station electrically preceding the open functions as an end station while the station electrically succeeding the open functions as a head station.

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