公开(公告)号：WO1991010182A1

公开(公告)日：1991-07-11

申请号：PCT/US1990004407

申请日：1990-08-07

Applicant: BELL COMMUNICATIONS RESEARCH, INC.

Inventor： BELL COMMUNICATIONS RESEARCH, INC. ,  ALSPECTOR, Joshua ,  CHU, Robert, Ray ,  GANNETT, Joel, Wright ,  HABER, Stuart, Alan ,  PARKER, Michael, Benjamin

IPC: G06F01/02

CPC classification number: G06F7/584 ,  G06F2207/581 ,  G06F2207/583

Abstract: Plural, arbitrarily-shifted, pseudo-random bits streams are generated from a single linear feedback shift register (LFSR) (201). Each bit stream is obtained by tapping the outputs of selected LFSR cells (202) and feeding these tapped cell outputs through a set of exclusive-OR gates (206). The taps are selected in order to achieve the desired shift between bit streams. In addition, the tap patterns can be selected so that the number of inputs (fan-in) to each bit stream are within predetermined bounds and that the number of taps per cell (cell load ) are within predetermined bounds. A disclosed computer program generates the tap patterns as a function of the number of cells and the structure of the LFSR, the number of output bit streams, the maximum allowed shift variation of the bit streams, and the bounds on fan-in and cell load. Each pseudo-random bit stream serves as an input to a low-pass filter which produces an essentially Gaussian noise output. The plural noise outputs are relatively uncorrelated and can be used in a parallel stochastic learning neural network for purposes such as annealing.

Abstract translation: 从单个线性反馈移位寄存器（LFSR）（201）生成多个任意移位的伪随机比特流。 通过点击所选LFSR单元（202）的输出并通过一组异或门（206）馈送这些抽头单元输出来获得每个比特流。 选择抽头以便在位流之间实现期望的移位。 此外，可以选择抽头模式，使得每个位流的输入（扇入）数目在预定范围内，并且每个单元的抽头数（单元负载）在预定范围内。 所公开的计算机程序产生抽头模式作为小区的数量和LFSR的结构，输出比特流的数量，比特流的最大允许移位变化以及扇入和小区负载的边界的函数 。 每个伪随机比特流用作产生基本高斯噪声输出的低通滤波器的输入。 多个噪声输出是相对不相关的，并且可以用于并行随机学习神经网络中用于诸如退火的目的。

公开(公告)号：WO1991008636A1

公开(公告)日：1991-06-13

申请号：PCT/US1990005010

申请日：1990-09-05

Applicant: BELL COMMUNICATIONS RESEARCH, INC.

Inventor： BELL COMMUNICATIONS RESEARCH, INC. ,  EPHRAIM, Robert, Martin

IPC: H04M09/00

CPC classification number: H04Q11/0471 ,  H04M1/723 ,  H04Q2213/09 ,  H04Q2213/1309 ,  H04Q2213/13096 ,  H04Q2213/13209 ,  H04Q2213/13299 ,  H04Q2213/22 ,  H04Q2213/299

Abstract: Several ISDN telephone terminals (20) on an ISDN passive bus (14) are enabled to be used to share a single voice communication in an extension phone arrangement by means of a second bus (27) connecting the analog sides of the terminal circuits. Once an incoming or outgoing voice call has been established at one of the number of ISDN terminals located on the premises, any others of such terminals may join the conversation by simply completing an off-hook connection by way of the analog bus (27). In conversion of premises to ISDN systems, the abandoned conventional telephone wiring may be employed as the analog bus. Conventional analog phones (29) may also be utilized with ISDN voice terminals (20) via the analog bus (27).

公开(公告)号：WO1991007787A1

公开(公告)日：1991-05-30

申请号：PCT/US1990003805

申请日：1990-07-02

Applicant: BELL COMMUNICATIONS RESEARCH, INC.

Inventor： BELL COMMUNICATIONS RESEARCH, INC. ,  ZAH, Cheung-en

IPC: H01S03/08

CPC classification number: H01S5/50 ,  H01S5/10 ,  H01S5/1064 ,  H01S5/1085

Abstract: The effective modal reflectivity of angled antireflection-coated facets (18, 16) of a traveling-wave laser amplifier is significantly reduced by flaring the waveguiding portion (22, 24) of the amplifier in the immediate vicinity of the facets. In this way, low-reflectivity facets are achieved with simple low-cost antireflection coatings (19, 17), thereby providing economical amplifiers characterized by wide bandwidth and high output saturation power.

公开(公告)号：WO1991002407A1

公开(公告)日：1991-02-21

申请号：PCT/US1990004412

申请日：1990-08-07

Applicant: BELL COMMUNICATIONS RESEARCH, INC.

Inventor： BELL COMMUNICATIONS RESEARCH, INC. ,  CRESPO, Pedro, Miguel ,  HONIG, Michael, Latham

IPC: H03H07/075

CPC classification number: H03H21/0012 ,  H04L25/03057

Abstract: A digital decision feedback equalizer is disclosed in which compensation for the post-cursors of the impulse response of the transmission channel is divided up into two regions. A first region (70) encompasses the initial rapidly changing unpredictable transient response, possibly oscillatory, of the transmission channel. A fast acting, close-tracking linear filter (37) is used to compensate for this largely unpredictable initial transient. The second region (72) of the impulse response is the slowly changing, easily predictable asymptotic tail of the impulse response. This second region can be compensated for by a relatively slow acting, simple pole-zero filter (36). A finite impulse response (FIR) filter (37) is used to copensate for the unpredictable, rapidly changing initial transient portion of the impulse response, while an infinite impulse response (IIR) filter (36) is used to compensate for the slower acting tail portion of the impulse response.

公开(公告)号：WO1989005040A1

公开(公告)日：1989-06-01

申请号：PCT/US1988003850

申请日：1988-10-31

Applicant: BELL COMMUNICATIONS RESEARCH, INC.

Inventor： BELL COMMUNICATIONS RESEARCH, INC. ,  GRINBERG, Anatoly ,  KASTALSKY, Alexander

IPC: H01L29/76

CPC classification number: H01L29/66446 ,  H01L29/1029 ,  H01L29/452 ,  H01L29/475 ,  H01L29/772 ,  H01L29/7783

Abstract: A semiconductor device formed on a substrate (10) includes a first layer (11) of semiconductor material of a first conductivity type forming a collector (drain) region of said device; and a second layer (12) of semiconductor material of a first conductivity type composed of a relatively wide energy bandgap material disposed on the first layer (11) and forming a collector potential barrier region of the device. A third layer (15) of semiconductor material is provided composed of a relatively narrow energy bandgap material disposed on the second layer (12) and forming an emitter (source) region of the device. A fourth layer (16) of semiconductor material is further provided composed of a relatively wide energy bandgap material disposed on the third layer (15) and forming a gate region of the device. Carriers are confined in layer (15) which forms a double barrier single quantum well structure together with layers (12, 16). A Ti/AuGe/Au metallization is used for making a vertical ohmic contact to the collector region (11), a selective lateral contact to the quantum well region (15) and a Schottky contact to the gate region (16). In operation, the gate structure (16, 17, 18, 22) controls the variation of the work function for thermionic emission from the quantum well region (15) to the collector region (11) over the collector potential barrier region (12). In order to minimize a current leakage to the gate, the gate barrier in the quantum well is preferably larger than the collector barrier.

公开(公告)号：WO1988007220A1

公开(公告)日：1988-09-22

申请号：PCT/US1988000831

申请日：1988-03-03

Applicant: BELL COMMUNICATIONS RESEARCH, INC.

Inventor： BELL COMMUNICATIONS RESEARCH, INC. ,  SILBERBERG, Yaron

IPC: G02F01/29

CPC classification number: G02F1/3137

Abstract: An electro-optic switch implemented on a substrate (11) which includes first and second input waveguides (12, 13) of unequal width and central region (14) in which light from the two input wave guides converge. First and second output waveguides (15, 16) are provided which diverge from the central region. Electrodes (17, 18, 19) for generating an electric field are disposed adjacent the central region and output waveguides for switching a beam of light from the first to the second output waveguide in a step-like manner in response to a control voltage.

公开(公告)号：WO1987001875A1

公开(公告)日：1987-03-26

申请号：PCT/US1985001814

申请日：1985-09-24

Applicant: BELL COMMUNICATIONS RESEARCH, INC. ,  ALBANESE, Andres

Inventor： BELL COMMUNICATIONS RESEARCH, INC.

IPC: H01S03/133

CPC classification number: H01S5/06808 ,  H01S5/0612

Abstract: Apparatus which stabilizes the temperature, and thereby the output wavelength, of an injection laser. Means (50 and 23) monitor the laser terminal voltage across a laser (11) and derive a voltage therefrom which is proportional to the junction voltage of the laser. Means (24) compares the voltage to a reference value from source (27) and a temperature controller (35) adjusts the laser temperature in response to the results of the comparison. Further embodiments of the present invention vary the output wavelength of the laser by varying the reference value from source (27) against which the laser junction voltage is compared.

Abstract translation: 稳定注射激光器的温度，从而稳定输出波长的装置。 装置（50和23）监测激光器（11）上的激光端子电压，并从其中导出与激光器的结电压成比例的电压。 装置（24）将电压与来自源（27）的参考值进行比较，并且温度控制器（35）响应于比较的结果来调节激光器温度。 本发明的其它实施例通过改变与激光结电压进行比较的源极（27）的参考值来改变激光器的输出波长。

公开(公告)号：WO1986002208A1

公开(公告)日：1986-04-10

申请号：PCT/US1985001845

申请日：1985-09-25

Applicant: BELL COMMUNICATIONS RESEARCH, INC.

Inventor： BELL COMMUNICATIONS RESEARCH, INC. ,  MILLER, Stewart, Edward

IPC: H01S03/08

CPC classification number: H01S5/06256 ,  H01S5/10 ,  H01S5/1025 ,  H01S5/125

Abstract: An injection laser which advantageously reduces main mode output power fluctuation. The laser comprises a laser cavity (52, 53) having an active material (50) joined at one end to a passive waveguide (51). The passive waveguide has a length which is equal to or greater than the length of the active material and an index of refraction which is substantially equal to that of the active material to prevent multicavity interference. In preferred embodiments of the present invention, the passive material is fabricated from a semiconductor material having a bandgap which is larger in energy than the energy of a photon in the laser radiation.

Abstract translation: 一种有利地降低主模式输出功率波动的注入激光器。 激光器包括具有在一端连接到无源波导（51）的活性材料（50）的激光腔（52,53）。 无源波导具有等于或大于活性材料的长度的长度和基本上等于活性材料的折射率以防止多腔干涉。 在本发明的优选实施例中，被动材料由具有能量大于激光辐射中的光子能量的带隙的半导体材料制成。

公开(公告)号：WO1998008316A1

公开(公告)日：1998-02-26

申请号：PCT/US1997014220

申请日：1997-08-13

Applicant: BELL COMMUNICATIONS RESEARCH, INC.

Inventor： BELL COMMUNICATIONS RESEARCH, INC. ,  EFFENBERGER, Frank, J.

IPC: H04B10/12

CPC classification number: H04N5/04 ,  H04N7/22

Abstract: A technique for delivering analog video over fiber-to-the-home (FTTH) networks addresses a fundamental problem of the standard signal format, i.e., power budget constraint, by increasing the useable optical signal efficiency. In particular, a technique is provided for transmitting an efficient modified analog video which is compatible with existing receivers. More specifically, the synchronization portion of a standard NTSC video signal (92) is reduced in amplitude (98) during transmission, producing an appreciable increase in the allowable optical modulation index (OMI).

Abstract translation: 通过光纤到户（FTTH）网络传送模拟视频的技术通过增加可用的光信号效率来解决标准信号格式的基本问题，即功率预算约束。 特别地，提供了一种传输与现有接收机兼容的有效的修改的模拟视频的技术。 更具体地，标准NTSC视频信号（92）的同步部分在传输期间以幅度（98）减小，从而产生可允许的光调制指数（OMI）的明显增加。

公开(公告)号：WO1998007251A1

公开(公告)日：1998-02-19

申请号：PCT/US1997014574

申请日：1997-08-15

Applicant: BELL COMMUNICATIONS RESEARCH, INC.

Inventor： BELL COMMUNICATIONS RESEARCH, INC. ,  VENKATESAN, Ramarathnam

IPC: H04L09/00

CPC classification number: H04L9/0662 ,  H04L2209/122

Abstract: The cryptographically secure pseudo-random bit generator (100) includes a front-end generator (102), a selector (104), a random function processor (106), a graph processor (108), and a bit-wise exclusive-or circuit (110). This cryptographically secure pseudo-random bit generator (100) stretches bit strings by the use of certain one-way functions acting on the bit strings. In addition, bit strings are generated from other input bit strings using expander graphs. The stretched bit strings and the bit strings from the expander graphs are combined in the bit-wise exclusive-or circuit.

Abstract translation: 密码安全的伪随机比特生成器（100）包括前端生成器（102），选择器（104），随机函数处理器（106），图形处理器（108）以及逐位异或 电路（110）。 这种密码安全的伪随机比特生成器（100）通过使用作用于比特串的特定单向函数来拉伸比特串。 此外，使用扩展器图从其他输入位串生成位串。 扩展的位串和扩展器图中的位串被组合在逐位异或电路中。