公开(公告)号：US20060250835A1

公开(公告)日：2006-11-09

申请号：US11395304

申请日：2006-04-03

申请人： Bernhard Junginger

发明人： Bernhard Junginger

IPC分类号： G11C11/22

CPC分类号： G02F1/0136 ,  G02F1/035 ,  G02F2001/0139

摘要： A driver circuit for a polarization scrambler (11) having a number of electrodes (17) is characterized in that the driver circuit comprises at least one pulse source (18) emitting a pulsed signal at a fundamental frequency, that the driver circuit further comprises a plurality of passive filter and matching circuits (19) for said number of electrodes (17) of said polarization scrambler (11), wherein each passive filter and matching circuit (19) is designed for driving one or several of the electrodes (17), and wherein each passive filter and matching circuit (19) is designed such that it filters out at least one harmonic mode frequency of said pulsed signal. The inventive driver circuit has a low power consumption and generates only few heat.

摘要翻译： 具有多个电极（17）的偏振扰码器（11）的驱动电路的特征在于，驱动电路包括以基频发射脉冲信号的至少一个脉冲源（18），该驱动器电路还包括一个 多个无源滤波器和用于所述极化扰频器（11）的所述电极（17）的匹配电路（19），其中每个无源滤波器和匹配电路（19）被设计用于驱动一个或多个电极（17）， 并且其中每个无源滤波器和匹配电路（19）被设计成使得其滤出所述脉冲信号的至少一个谐波模式频率。 本发明的驱动器电路具有低功耗并且仅产生很少的热量。

公开(公告)号：US20040042702A1

公开(公告)日：2004-03-04

申请号：US10342296

申请日：2003-01-15

申请人： Fujitsu Limited

发明人： Kazuaki Akimoto

IPC分类号： G02B006/00

CPC分类号： G02F1/0136 ,  G02B6/274 ,  G02F2001/0139

摘要： A method of controlling a polarization scrambler which changes a state of polarization of incident light with time in accordance with a driving voltage. The method includes a first step of applying the driving voltage so that the polarization state of the incident light changes from a starting point and makes N rotations (where N is a positive integer) around a longitude line of the Poincare sphere in a unit time, and a second step of applying the driving voltage so that the polarized light at the starting point on the Poincare sphere becomes the polarized light at an arbitrary position on the Poincare sphere instantaneously. The first step and the second step are repeated.

摘要翻译： 一种控制偏振加扰器的方法，其根据驱动电压随时间改变入射光的偏振状态。 该方法包括施加驱动电压以使得入射光的偏振状态从起点改变并且以单位时间在庞加莱球的经度线周围N旋转（其中N为正整数）的第一步骤， 以及第二步骤，施加驱动电压，使得庞卡莱球上的起始点处的偏振光瞬间成为庞加莱球上的任意位置处的偏振光。 重复第一步和第二步。

公开(公告)号：US20020037127A1

公开(公告)日：2002-03-28

申请号：US09922015

申请日：2001-08-03

发明人： Joseph David Evankow JR.

IPC分类号： G02B006/27

CPC分类号： G02F1/0136 ,  G02F1/0134 ,  G02F2001/0139

摘要： A technique, specifically apparatus (5) and an accompanying method, for an optical scrambler and particularly one that provides scrambled states of polarization (SOPs) in an optical fiber (4). Specifically, polarization independence is achieved by wrapping a single optical fiber (4) around each tube in a cascade of separate piezoelectric tubes (PZTs) (10; 10a, 10b, 10c, 10d, 10e, 10f), with random amounts of fixed birefringence (30; 30a, 30b, 30c, 30d, 30e, 30f) separating each tube, where each tube is then separately excited on a time-varying basis. The tubes are arranged in two groups (101, 102), of illustratively three tubes each. Each tube in the first group is separately excited by combined frequency/amplitude modulation (20a, 20b, 20c) with illustratively different modulating frequencies and amplitudes. Each tube in the second group is excited at illustratively a constant frequency and voltage (20d, 20e, 20f) . The excitation applied to each tube causes that tube to exhibit geometrical, physical displacement which, in turn, imparts a time-varying birefringence to light as it passes through that portion of the fiber wound around that particular tube. This time-varying birefringence produced by each tube perturbs an initial SOP of the light provided by that tube from its original pseudo-stationary position as depicted on a Poincarnull sphere.

摘要翻译： 一种用于光学扰频器的技术，具体是装置（5）和伴随方法，特别是在光纤（4）中提供加扰的偏振状态（SOP）的技术。 具体地说，通过在单独的压电管（PZT）（10; 10a，10b，10c，10d，10e，10f）的级联中围绕每个管围绕单个光纤4来实现偏振独立性，其中随机量的固定双折射 （30; 30a，30b，30c，30d，30e，30f）分离每个管，其中每个管随后在时变基础上分开激发。 管子分成两组（101,102），每个管子有三个管子。 第一组中的每个管由组合的频率/幅度调制（20a，20b，20c）分别激发，具有不同的调制频率和幅度。 第二组中的每个管在示例性地以恒定的频率和电压（20d，20e，20f）被激发。 施加到每个管的激励导致该管呈现出几何的物理位移，其随后通过在该特定管周围缠绕的纤维的那部分而对光赋予时变双折射。 每个管产生的时变双折射扰动了由该管提供的光从其原始伪静止位置的初始SOP，如Poincaré球体所示。

公开(公告)号：US06333808B1

公开(公告)日：2001-12-25

申请号：US09559656

申请日：2000-04-28

申请人： Stephen Michael Webb ,  Ian Haxell

发明人： Stephen Michael Webb ,  Ian Haxell

IPC分类号： G02F100

CPC分类号： H04B10/505 ,  G02F1/0136 ,  G02F2001/0139 ,  G02F2201/17 ,  H04B10/506

摘要： An optical signal scrambler (18) has an optical phase modulator (22) which has a common input/output for an optical signal. The modulator also has an input for a modulating signal and a common output/input which is coupled to a 45° Faraday mirror (24). The scrambler (18) operates to modify an optical input signal received at the input/output of the modulator (22) so that it is returned as an output which is phase scrambled.

摘要翻译： 光信号加扰器（18）具有光相位调制器（22），其具有用于光信号的公共输入/输出。 调制器还具有用于调制信号的输入端和耦合到45°法拉第镜（24）的公共输出/输入端。 加扰器（18）操作以修改在调制器（22）的输入/输出处接收的光输入信号，使得其作为相位加扰的输出返回。

公开(公告)号：US6046839A

公开(公告)日：2000-04-04

申请号：US216705

申请日：1998-12-21

申请人： Tomoyuki Ito ,  Toshihiro Ohtani ,  Yoshinobu Kubota ,  Yasuhiro Omori

发明人： Tomoyuki Ito ,  Toshihiro Ohtani ,  Yoshinobu Kubota ,  Yasuhiro Omori

IPC分类号： G02F1/035 ,  G02F1/01 ,  G02F1/125 ,  G02F1/03

CPC分类号： G02F1/125 ,  G02F2001/0139

摘要： An object of the invention is to provide a polarization scrambler wherein the polarization of linearly polarized signal light can be rotated to facilitate obtaining a minimum degree of polarization, and wherein scrambling operation is possible even if signal light of optional polarization states is input. Accordingly with the polarization scrambler, a polarization rotation section is provided on an input side on a chip on which is formed an optical waveguide, and a polarization scrambling section is provided on an output side. With the polarization rotation section, the polarization of linearly polarized signal light which is transmitted by the optical waveguide is rotated by means of an acousto-optic effect due to an elastic surface wave generated by an electrode, so as to become 45.degree. with respect to a vertical direction of the optical waveguide. With the polarization scrambling section, the polarization of the signal light from the polarization rotation section is scrambled in accordance with a modulation signal.

摘要翻译： 本发明的目的是提供一种偏振加扰器，其中线偏振信号光的极化可以旋转以便于获得最小的偏振度，并且即使输入了可选偏振状态的信号光也可以进行扰频操作。 因此，利用极化扰频器，在形成光波导的芯片的输入侧设置偏振旋转部，偏振加扰部设置在输出侧。 利用偏振旋转部分，由光波导传输的线偏振信号光的偏振由于由电极产生的弹性表面波而通过声光效应旋转，从而相对于 光波导的垂直方向。 利用偏振加扰部分，根据调制信号对来自偏振旋转部分的信号光的偏振进行加扰。

公开(公告)号：US5911016A

公开(公告)日：1999-06-08

申请号：US921338

申请日：1997-08-29

申请人： Takao Naito

发明人： Takao Naito

IPC分类号： G02B6/12 ,  G02F1/01 ,  G02F1/225 ,  H04B10/2507 ,  H04B10/2569 ,  H04B10/27 ,  H04B10/29 ,  H04B10/40 ,  H04B10/50 ,  H04B10/516 ,  H04B10/54 ,  H04B10/548 ,  H04B10/588 ,  H04B10/60 ,  H04B10/61 ,  G02B6/10

CPC分类号： H04B10/2572 ,  G02F1/225 ,  G02F2001/0139

摘要： A signal light incident onto a first splitter of a polarization scrambler is split into two and propagated through a first and second optical paths, whereby phases of the signal lights are varied in accordance with a voltage applied by first voltage supplier. Further, a polarization of the signal light propagated through at least one of the first and second optical paths is rotated for adjusting a relative polarization angle between the signal lights by first plane-of-polarization rotator. The signal lights having passed through the optical paths are combined by first coupler so that a polarization condition of the incident signal light is scrambled and output. Polarization dispersion is allowed to occur only after the signal light has passed through the plane-of-polarization rotator.

摘要翻译： 入射到偏振加扰器的第一分离器上的信号光被分成两部分，并且通过第一和第二光路传播，由此信号光的相位根据由第一电压供应器施加的电压而变化。 此外，旋转通过第一和第二光路中的至少一个传播的信号光的偏振，以通过第一偏振旋光器调整信号光之间的相对偏振角。 已经通过光路的信号灯由第一耦合器组合，使得入射信号光的偏振状态被加扰并输出。 仅在信号光通过偏振面旋转器之后才允许发生极化色散。

公开(公告)号：US5739943A

公开(公告)日：1998-04-14

申请号：US697446

申请日：1996-08-23

申请人： Shigeru Ohshima ,  Tazuko Tomioka ,  Mitsuko Nakamura ,  Senji Shimanuki ,  Manish Sharma ,  Hiroyuki Ibe ,  Hitoshi Takahira ,  Shu Yamamoto

发明人： Shigeru Ohshima ,  Tazuko Tomioka ,  Mitsuko Nakamura ,  Senji Shimanuki ,  Manish Sharma ,  Hiroyuki Ibe ,  Hitoshi Takahira ,  Shu Yamamoto

IPC分类号： G02F1/01 ,  G02F1/03 ,  G02F1/035 ,  G02F1/09 ,  H04B10/135

CPC分类号： H04B10/532 ,  G02F1/0311 ,  G02F1/0353 ,  G02F1/093 ,  G02F2001/0139

摘要： Light beams emitted from an optical fiber are converted into parallel light beams by a lens, and then allowed to pass through a Faraday device, followed by being converged to an incident end of the optical fiber by a lens. The Faraday device is applied with a magnetic field in a direction of the optical axis thereof from a coil. Moreover, the Faraday device is applied with a magnetic field in a direction perpendicular to the optical axis by a pair of magnets. When an electric current flowing in a coil 74 is changed from I to -I, the direction of a synthesized magnetic field can be rotated. Therefore, by arbitrarily changing the electric current flowing in the coil, polarization of transmission light can be controlled.

摘要翻译： 从光纤射出的光束被透镜转换为平行光束，然后通过法拉第装置，然后通过透镜会聚到光纤的入射端。 法拉第装置从线圈沿其光轴的方向施加磁场。 此外，法拉第装置通过一对磁体在垂直于光轴的方向上施加磁场。 当在线圈74中流动的电流从I变为-I时，合成磁场的方向可以旋转。 因此，通过任意地改变在线圈中流动的电流，可以控制透射光的极化。

公开(公告)号：US5127066A

公开(公告)日：1992-06-30

申请号：US608499

申请日：1990-11-02

申请人： Pierluigi Poggiolini

发明人： Pierluigi Poggiolini

IPC分类号： H04B10/02 ,  G02F1/01 ,  H04B7/10 ,  H04B10/135 ,  H04B10/18

CPC分类号： H04B10/532 ,  G02F2001/0139

摘要： A coherent optical-fiber transmission system is rendered insensitive to fluctuations of the state of polarization of the electromagnetic field due to propagation along the fiber by varying at the transmitting side the state of polarization of the optical carrier modulated by the information signal to be transmitted. The variation is such that spectral broadening of the intermediate frequency signal at the receiver is kept limited, while reception of half the power outgoing from the fiber is ensured.