公开(公告)号：US4881788A

公开(公告)日：1989-11-21

申请号：US209477

申请日：1988-06-20

申请人： Nicholas J. Doran

发明人： Nicholas J. Doran

IPC分类号： G02F1/35 ,  G02F1/21 ,  G02F1/31 ,  G02F1/313 ,  G02F3/00

CPC分类号： G02F1/3519 ,  G02F3/00

摘要： An optical device comprises first and second optical waveguides connected between respective output and input ports of first and second optical couplers. The first coupler has at least one input port and is adapted to couple optical signals received at the input port into its output ports in a predetermined coupling ratio. The second coupler has at least one output port and is adapted to couple optical signals received at each input port into its output port in a predetermined coupling ratio. The first and second waveguides define respective optical paths with substantially the same optical length. The waveguides are fabricated from materials which exhibit soliton effects when optical pulses, at working intensities, are injected into the waveguides, such that the pulse propagation is dispersion dependent, whereby the portions of an optical pulse received at the input of the first coupler are coupled into the waveguides by the first coupler and arrive synchronously but phase shifted relative to one another at the second coupler after travelling along the waveguides. The device may be configured to provide optical switching and logic functions.

公开(公告)号：US4962987A

公开(公告)日：1990-10-16

申请号：US209479

申请日：1988-06-20

申请人： Nicholas J. Doran

发明人： Nicholas J. Doran

IPC分类号： G02F1/35 ,  G02F1/21 ,  G02F1/31 ,  G02F1/313 ,  G02F3/00

CPC分类号： G02F1/3519 ,  G02F3/00

摘要： An optical device comprises an optical waveguide (2) formed from at least a first material having a non-linear refractive index n.sub.2 coupled to a first pair of ports (4,5) of an optical coupler (3). An optical signal input at one of the second pair of ports (6,7) of the coupler (3) is split to provide two signals counter propagating around the waveguide loop (2). By selecting the coupling ratio and appropriate waveguide parameters to ensure an asymmetry in the device it is possible to produce an intensity dependent relative phase shift between the counter propagating signals, thereby to vary the device output. Embodiments of the invention may be used to perform logic functions on, to amplify, switch or otherwise modify an input signal.

公开(公告)号：US5208455A

公开(公告)日：1993-05-04

申请号：US842342

申请日：1992-03-25

申请人： Brian P. Nelson ,  Keith J. Blow ,  Nicholas J. Doran

发明人： Brian P. Nelson ,  Keith J. Blow ,  Nicholas J. Doran

IPC分类号： G02B6/28 ,  G02F1/35 ,  H01S3/00 ,  H01S3/10

CPC分类号： G02B6/2821 ,  G02B6/2861 ,  G02F1/3519 ,  H01S3/0057

摘要： An all-optical fibre Sagnac antiresonant interferometer (2) is formed from an optical fibre having a non-linear refractive index. The coupler (8) is a dichroic coupler coupling equal portions of a cw optical signal at 1.53 .mu.m from laser (16) to ports (14 and 16) and all of a pulsed optical signal from laser (20 ) to port (14). The intensity of the pulsed optical signal is sufficient to provide a relative phase shift in the counter propagating 1.53 .mu.m signals. The loop (6) is longer than the inverse of the absolute difference in group delays of the cw and pulsed optical so causing a square optical pulse at 1.53 .mu.m to be switched to port (12) of the coupler.

摘要翻译： PCT No.PCT / GB90 / 01422 Sec。 371日期：1992年3月25日 102（e）1992年3月25日PCT PCT 1990年9月14日PCT公布。 出版物WO91 / 04593 日期为1991年4月4日。全光纤Sagnac反谐振干涉仪（2）由具有非线性折射率的光纤形成。 耦合器（8）是将激光器（16）到端口（14和16）的1.53μm的cw光信号的相等部分耦合到二极管，并且从激光器（20）到端口（14）的所有脉冲光信号， 。 脉冲光信号的强度足以提供反向传播1.53微米信号的相对相移。 循环（6）比cw和脉冲光学的组延迟的绝对差的倒数长，使得在1.53μm处的正方形光脉冲被切换到耦合器的端口（12）。

公开(公告)号：US5473712A

公开(公告)日：1995-12-05

申请号：US66139

申请日：1993-07-26

申请人： Keith J. Blow ,  Nicholas J. Doran

发明人： Keith J. Blow ,  Nicholas J. Doran

IPC分类号： G02F1/35 ,  G02F3/00 ,  G01C19/72

CPC分类号： G02F3/00 ,  G02F1/3519

摘要： An optical switch comprises an optical fibre Sagnac loop interferometer having an input port and an output port. A source of optical signals at 1.53 .mu.m is coupled to the input port and a source of control optical signals of wavelengths 1.30 .mu.m and 1.31 .mu.m are coupled to the interferometer by a dichroic coupler. The coupler splits the 1.53 .mu.m input optical signal into two signal portions which counterpropagate round the loop and couples the control signal to propagate in one direction only round the loop. The phase difference between the signal portions at the output port is dependent on the intensity of the control optical signal when they recombine at the coupler. The optical control signals are formed by combining at least two optical pulse streams, the pulses of distinct optical pulse streams being non-interferometric, to provide a logical AND gate.

摘要翻译： PCT No.PCT / GB91 / 02091 Sec。 371日期：1993年7月26日 102（e）日期1993年7月26日PCT 1991年11月27日PCT PCT。 出版物WO92 / 09916 日期：1992年6月11日。光开关包括具有输入端口和输出端口的光纤Sagnac环路干涉仪。 1.53μm的光信号源耦合到输入端口，波长为1.30μm和1.31μm的控制光信号源通过二向色耦合器耦合到干涉仪。 耦合器将1.53μm输入光信号分成两个信号部分，这两个信号部分相反地绕着环路传播，并将控制信号耦合在一个方向上，仅在环路周围传播。 在输出端口处的信号部分之间的相位差取决于控制光信号在耦合器复合时的强度。 通过组合至少两个光脉冲流来形成光控制信号，不同的光脉冲流的脉冲是非干涉的，以提供逻辑与门。

公开(公告)号：US5333220A

公开(公告)日：1994-07-26

申请号：US842340

申请日：1992-03-25

申请人： Brian P. Nelson ,  Keith J. Blow ,  Nicholas J. Doran

发明人： Brian P. Nelson ,  Keith J. Blow ,  Nicholas J. Doran

IPC分类号： G02B6/28 ,  G02F1/35 ,  G02B6/26

CPC分类号： G02B6/2804 ,  G02B6/2861 ,  G02F1/3519

摘要： A single silica optical fiber (4) is formed in a Sagnac interferometer (2) by forming a fused, dichroic optical fiber coupler (8) having four ports (10, 12, 14 and 16). A 1.3 .mu.m optical data signal is coupled to the port (10) via a dichroic optical fiber coupler (18) which combines it with a 1.53 .mu.m c-w probe signal from laser (16). The coupler (8) splits the 1.53 .mu.m probe signal into two equal intensity, counter-propagating portions and couples the 1.3 .mu.m data signal so it propagates in one direction round the loop (6). The loop (6) exhibits a non-linearity such that the data signal provides a relative phase shift of the counter-propagating c-w probe portions causing a portion of the 1.53 .mu.m signal is switched to port (12). This 1.53 .mu.m switched output provides tapping of the data signal without affecting its intensity.

摘要翻译： PCT No.PCT / GB90 / 01417 Sec。 371日期：1992年3月25日 102（e）日期1992年3月25日PCT提交1990年9月13日PCT公布。 公开号WO91 / 04509 日期：1991年4月4日。通过形成具有四个端口（10,12,14和16）的融合的二向色光纤耦合器（8），在Sagnac干涉仪（2）中形成单个二氧化硅光纤（4）。 1.3μm的光学数据信号经由二分色光纤耦合器（18）耦合到端口（10），该二向色光纤耦合器将其与来自激光器（16）的1.53μmc-w探针信号组合。 耦合器（8）将1.53μm的探测信号分成两个相等强度的反向传播部分，并耦合1.3μm的数据信号，使其沿着环路（6）的一个方向传播。 环路（6）呈现非线性，使得数据信号提供反向传播的c-w探头部分的相对相移，导致1.53μm信号的一部分被切换到端口（12）。 这个1.53微米的开关量输出提供数据信号的分接而不影响其强度。

公开(公告)号：US5307428A

公开(公告)日：1994-04-26

申请号：US949888

申请日：1992-11-24

申请人： Keith J. Blow ,  Nicholas J. Doran ,  Brian P. Nelson

发明人： Keith J. Blow ,  Nicholas J. Doran ,  Brian P. Nelson

IPC分类号： G02F1/313 ,  G02F1/35 ,  H04B10/25 ,  H04J14/08 ,  G02B6/26

CPC分类号： H04B10/25 ,  G02F1/3519 ,  H04J14/08

摘要： An optical apparatus including a first optical coupling having a first and a second pair of optical communication ports in which substantially equal portions of an optical signal received at a port of one pair of ports are coupled to each port of the other pair of ports; an optical waveguide optically coupling the second pair of ports such that an optical signal leaving either one of the second pair of ports in a first polarization state; a second optical coupling for coupling an optical signal at a second wavelength to the optical waveguide so as to propagate along at least a portion of it in one direction only; and first and second polarizing beam splitters optically coupled to a respective one of the first pair of ports.

摘要翻译： PCT No.PCT / GB91 / 00453 Sec。 371日期：1992年11月24日 102（e）日期1992年11月24日PCT 1991年3月26日PCT公布。 公开号WO91 / 14963 日期：1991年10月3日。一种光学装置，包括具有第一和第二对光通信端口的第一光耦合器，其中在一对端口的端口处接收的光信号的大致相等的部分耦合到 另一对港口; 光波导，其光耦合所述第二对端口，使得在第一偏振状态中离开所述第二对端口中的任一个的光信号; 第二光耦合器，用于将第二波长的光信号耦合到光波导，以沿着其至少一部分沿一个方向传播; 以及光学耦合到第一对端口中的相应一个端口的第一和第二偏振分束器。

公开(公告)号：US5058986A

公开(公告)日：1991-10-22

申请号：US447125

申请日：1989-12-11

申请人： Bimal K. Nayar ,  Keith J. Blow ,  Nicholas J. Doran

发明人： Bimal K. Nayar ,  Keith J. Blow ,  Nicholas J. Doran

IPC分类号： G02B6/02 ,  G02F1/35 ,  G02F3/00

CPC分类号： G02F3/00 ,  G02F1/3519

摘要： An optical fibre, loop interferometer (31) is formed from germania doped silica which exhibits Raman scattering at a threshold intensity to provide a transmitted optical signal from port (49) of coupler (35) whose intensity is a sigmoid function of the intensity of an optical signal input at port (39). It finds application in optical switching and logic operations on optical pulses.

公开(公告)号：US4973122A

公开(公告)日：1990-11-27

申请号：US382634

申请日：1989-08-02

申请人： David Cotter ,  Nicholas J. Doran ,  Keith J. Blow ,  David C. Wood

发明人： David Cotter ,  Nicholas J. Doran ,  Keith J. Blow ,  David C. Wood

IPC分类号： G01N33/53 ,  G01N33/00 ,  G01N33/543 ,  G01N33/554 ,  G01N33/564 ,  G01N33/569 ,  G01N33/68 ,  G02F1/313 ,  G02F1/35 ,  G02F3/00

CPC分类号： G01N33/554 ,  G01N33/564 ,  G01N33/56977 ,  G01N33/6878 ,  G02F1/3131 ,  G02F1/3519 ,  G02F3/00

摘要： An optical device includes a 50-50 cross-coupler having a pair of ports optically coupled by a waveguide which includes a portion of material having a non-linear refractive index with a relaxation time such that the effect on the non-linear portion of a first pulse passing through the portion last long enough to affect the phase of a second pulse relative to the first. It finds application as a logic element, optical amplifier modulator and the like.