公开(公告)号：US08380076B2

公开(公告)日：2013-02-19

申请号：US12520914

申请日：2006-12-27

申请人： Pierpaolo Boffi ,  Giorgio Grasso ,  Lucia Marazzi ,  Paola Parolari ,  Aldo Righetti ,  Marco Romagnoli ,  Giovanni Tamiri

发明人： Pierpaolo Boffi ,  Giorgio Grasso ,  Lucia Marazzi ,  Paola Parolari ,  Aldo Righetti ,  Marco Romagnoli ,  Giovanni Tamiri

IPC分类号： H04B10/12 ,  H04B10/00 ,  H04B10/02 ,  H04J14/02

CPC分类号： H04B10/25133 ,  G02B6/29343 ,  G02B6/29394

摘要： An optical transmission system having an optical source, an optical dispersion compensation filter optically connected to the optical source, and a control system. The optical source generates a modulated optical signal having an optical spectrum and a value of dispersion robustness. The optical dispersion compensation filter has at least two cascaded optical resonators and a periodic transfer function rigidly translatable in the frequency spectrum to obtain translation in frequency of the transfer function without a substantial change in shape, and characterized by a free spectral range. The control system acts on the optical dispersion compensation filter in order to rigidly translate the transfer function along the frequency spectrum in first and second positions in the frequency spectrum. The translation of the transfer function between the first and the second positions is smaller than the free spectral range.

摘要翻译： 一种具有光源，光学连接到光源的光学色散补偿滤光器和控制系统的光传输系统。 光源产生具有光谱和色散鲁棒性值的调制光信号。 光学色散补偿滤波器具有至少两个级联的光学谐振器和在频谱中可以刚性地平移的周期性传递函数，以获得传递函数的频率的平移，而不会形成实质的变化，并且其特征在于自由光谱范围。 控制系统作用于光学色散补偿滤波器，以便在频谱中的第一和第二位置沿着频谱刚性地平移传递函数。 第一和第二位置之间的传递函数的平移小于自由光谱范围。

公开(公告)号：US08200087B2

公开(公告)日：2012-06-12

申请号：US13038990

申请日：2011-03-02

申请人： Pierpaolo Boffi ,  Lucia Marazzi ,  Paolo Martelli ,  Mario Martinelli ,  Aldo Righetti ,  Rocco Siano

发明人： Pierpaolo Boffi ,  Lucia Marazzi ,  Paolo Martelli ,  Mario Martinelli ,  Aldo Righetti ,  Rocco Siano

IPC分类号： H04J14/06

CPC分类号： H04J14/06 ,  G02F1/0136 ,  H04J14/02

摘要： A device and method for stabilizing the state of polarization of polarization multiplexed optical radiation including an identified channel is disclosed. The device and method comprise providing to the polarization multiplexed optical radiation a first controllable polarization transformation to generate a first transformed optical radiation; detecting a first state of polarization of a first polarized portion with respect to a first polarization parameter; controlling the first controllable polarization transformation so that the first polarization parameter has a predetermined value independent of a polarization state of the polarization multiplexed optical radiation; providing to the first transformed optical radiation a second controllable polarization transformation to generate a second transformed optical radiation; detecting a second state of polarization of a second polarized portion; and controlling the second controllable polarization transformation so that the second state of polarization has a predefined value.

摘要翻译： 公开了一种用于稳定包括识别的通道的偏振复用光辐射的偏振状态的装置和方法。 该装置和方法包括向偏振复用光辐射提供第一可控偏振变换以产生第一变换光辐射; 检测相对于第一偏振参数的第一偏振部分的第一极化状态; 控制第一可控偏振变换，使得第一偏振参数具有与偏振复用光辐射的偏振状态无关的预定值; 向所述第一变换光辐射提供第二可控偏振变换以产生第二变换光辐射; 检测第二偏振部分的第二偏振状态; 以及控制所述第二可控偏振变换，使得所述第二极化状态具有预定义的值。

公开(公告)号：US07917031B2

公开(公告)日：2011-03-29

申请号：US11665466

申请日：2004-10-22

申请人： Pierpaolo Boffi ,  Lucia Marazzi ,  Paolo Martelli ,  Mario Martinelli ,  Aldo Righetti ,  Rocco Siano

发明人： Pierpaolo Boffi ,  Lucia Marazzi ,  Paolo Martelli ,  Mario Martinelli ,  Aldo Righetti ,  Rocco Siano

IPC分类号： H04J14/06

CPC分类号： H04J14/06 ,  G02F1/0136 ,  H04J14/02

摘要： A device and method for stabilizing the polarization of polarization multiplexed optical radiation includes an identified channel which is provided with a pilot signal. The device and method are based on providing to the polarization multiplexed optical radiation a controllable polarization transformation; measuring the optical power of a polarized portion of the identified channel downstream the polarization transformation; controlling, responsively to the optical power, the controllable polarization transformation so that the identified channel downstream the polarization transformation has a predefined polarization azimuth; providing to the optical radiation downstream the polarization transformation a further controllable polarization transformation; measuring the optical power of a polarized portion of the identified channel downstream the further controllable polarization transformation; and controlling, responsively to the optical power, the further controllable polarization transformation so that the identified channel downstream the further controllable polarization transformation has a predefined state of polarization.

摘要翻译： 用于稳定偏振复用光辐射的偏振的装置和方法包括被提供有导频信号的识别信道。 该装置和方法基于向偏振复用光辐射提供可控偏振变换; 测量在所述偏振变换下游的所识别的通道的极化部分的光功率; 响应于光功率控制可控偏振变换，使得偏振变换下游的识别信道具有预定义的偏振方位; 向偏光变换下游的光辐射提供进一步可控的偏振变换; 测量所识别的通道的偏振部分的光功率在下游的可控偏振变换; 并且响应于光功率控制进一步可控的偏振变换，使得在进一步可控偏振变换下游的识别信道具有预定的偏振状态。

公开(公告)号：US5233463A

公开(公告)日：1993-08-03

申请号：US857740

申请日：1992-03-26

申请人： Giorgio Grasso ,  Aldo Righetti

发明人： Giorgio Grasso ,  Aldo Righetti

IPC分类号： H01S3/067 ,  H04B10/17

CPC分类号： H04B10/2912 ,  H01S3/06758

摘要： The optical amplifier (1) comprises two amplifying stages, an upstream amplifying stage (S.sub.M) and a downstream amplifying stage (S.sub.V). The former stage comprises an upstream active fiber (9) doped with a fluorescent dopant and connected serially to the optical fiber line (2), an upstream optical coupler (10) connected serially downstream from the upstream section of active fiber (9), a laser diode (11) for supplying pumping energy towards the upstream active fiber (9) through the coupler (10), said coupler being oriented to cause pump energy travel towards said upstream active fiber (9) in the opposite direction from the predetermined signal direction (S); the latter stage (S.sub.V) comprises a downstream active fiber (3) doped with a fluorescent dopant and connected serially in the optical fiber (2), a downstream optical coupler (4) connected serially in the downstream active fiber (3), a laser diode (5) for supplying pumping energy into the downstream active fiber (3) through the downstream coupler (4), a first optical isolator ( 7) serially connected upstream of the downstream active fiber (3), a second optical isolator (8) serially connected downstream from the downstream active fiber (3).

摘要翻译： 光放大器（1）包括两个放大级，上游放大级（SM）和下游放大级（SV）。 前级包括掺杂有荧光掺杂剂的上游有源光纤（9）并且串联连接到光纤线路（2），连接在有源光纤（9）的上游部分下游的上游光耦合器（10） 激光二极管（11），用于通过耦合器（10）向上游有源光纤（9）提供泵浦能量，所述耦合器被定向成使得泵能量在与预定信号方向相反的方向上朝着所述上游有源光纤（9）行进 （S）; 后级（SV）包括掺杂有荧光掺杂剂并在光纤（2）中串联连接的下游有源光纤（3），串联连接在下游有源光纤（3）中的下游光耦合器（4），激光 用于通过下游耦合器（4）向下游有源光纤（3）提供泵浦能量的二极管（5），串联连接在下游有源光纤（3）上游的第一光隔离器（7），第二光隔离器（8） 与下游有源光纤（3）的下游串联连接。

公开(公告)号：US5138483A

公开(公告)日：1992-08-11

申请号：US824742

申请日：1992-01-21

申请人： Giorgio Grasso ,  Aldo Righetti ,  Flavio Fontana

发明人： Giorgio Grasso ,  Aldo Righetti ,  Flavio Fontana

IPC分类号： G02F1/35 ,  H01S3/06 ,  H01S3/07 ,  H01S3/0915 ,  H01S3/094 ,  H01S3/10 ,  H01S3/17 ,  H01S3/30 ,  H04B10/12

CPC分类号： H01S3/094003 ,  G05B2219/50372 ,  G05B2219/50373

摘要： An optical, low-noise amplifier of the active-fiber type, which fiber contains a laser light emitting substance, adapted to be connected to an optical telecommunication fiber and receiving light therefrom at the transmission wavelength. The active fiber is also fed from a light source at a pumping wavelength and has a length corresponding to a partial absorption of the pumping light. Downstream of active fiber, there is a selective mirror device which reflects the light at the pumping wavelength and is transparent to the transmission wavelength light. Preferably, the mirror device consists of an optical demultiplexer adapted to separate the transmission wavelength and the pumping wavelength on two output fibers. A mirror which reflects the pumping wavelength is present at the end of the fiber carrying the pumping wavelength.

摘要翻译： 一种有源光纤类型的光学低噪声放大器，该光纤包含激光发射物质，其适于连接到光通信光纤并以透射波长从其接收光。 有源光纤也从泵浦波长的光源进给，其长度对应于泵浦光的部分吸收。 在有源光纤的下游，有一个选择性反射镜装置，它反射了在激发波长的光，并对透射波长的光是透明的。 优选地，镜装置由适于在两个输出光纤上分离透射波长和激发波长的光解复用器组成。 反射泵浦波长的反射镜存在于带有泵浦波长的光纤的端部。

公开(公告)号：US20220011087A1

公开(公告)日：2022-01-13

申请号：US17599963

申请日：2020-04-03

申请人： Aldo RIGHETTI

发明人： Aldo RIGHETTI

IPC分类号： G01B9/02 ,  H01S3/106

摘要： The present invention relates to a method to tune a wavelength of a coherent light signal emitted by a tunable laser, the tunable laser comprising: a cavity, the cavity including: a gain medium, an optical tunable filter, a first and a second mirrors, one of which is partially reflective, wherein the optical tunable filter includes: a first and a second electrodes, a liquid crystal, the method comprising: applying a voltage difference between the first and second electrodes to apply an electric field to the liquid crystal; wherein applying a voltage difference includes: applying the voltage difference for at least a driving time interval lasting less than 1 μs; and varying the voltage difference applied between the first and second electrodes within the driving time interval so that a maximum applied voltage difference is reached and said maximum applied voltage is above 0.1 kV.

公开(公告)号：US08437645B2

公开(公告)日：2013-05-07

申请号：US12739842

申请日：2007-12-06

申请人： Pierpaolo Boffi ,  Lucia Marazzi ,  Paolo Martelli ,  Paola Parolari ,  Aldo Righetti

发明人： Pierpaolo Boffi ,  Lucia Marazzi ,  Paolo Martelli ,  Paola Parolari ,  Aldo Righetti

IPC分类号： H04B10/00 ,  H04B10/06

CPC分类号： H04B10/6161 ,  H04B10/61 ,  H04B10/6162 ,  H04B10/63 ,  H04B10/64

摘要： An optical communication system (100; 2300) comprises at least a transmitter (110) apt to emit a differential phase shift keying (DPSK) optical signal having a bit-rate equal to R, at least a receiving system (1200) for receiving the differential phase shift keying optical signal; and an optical link (130) optically connecting the transmitter and the receiving system for transmitting the DPSK optical signal from the transmitter to the receiving system, wherein the receiving system comprises a coherent optical receiving device (1205) apt to coherently receive the propagated DPSK optical signal and to emit at least one electrical signal (I) related to the received DPSK optical signal, and wherein the receiving system further comprises at least one electrical filter (270) for filtering the at least one electrical signal and having −3 dB double-side bandwidth greater than or equal to 0.44 R and lower than or equal to 0.68 R, and at least one squarer (280) for squaring the at least one filtered electrical signal. A related method for optical communication is also disclosed.

摘要翻译： 光通信系统（100; 2300）至少包括一个适于发射具有等于R的比特率的差分相移键控（DPSK）光信号的发射机（110），至少一接收系统（1200） 差分相移键控光信号; 以及光链路（130），其将所述发射机和所述接收系统光学连接，用于将所述DPSK光信号从所述发射机发射到所述接收系统，其中，所述接收系统包括相干光接收装置（1205），所述相干光接收装置适于相干地接收所传播的DPSK光 信号并且发射与所接收的DPSK光信号相关的至少一个电信号（I），并且其中所述接收系统还包括用于对所述至少一个电信号进行滤波并具有-3dB双频信号的至少一个电滤波器（270） 侧带宽大于或等于0.44 R且小于或等于0.68 R，以及至少一平方（280）用于平坦化至少一个滤波后的电信号。 还公开了一种用于光通信的相关方法。

公开(公告)号：US20100277798A1

公开(公告)日：2010-11-04

申请号：US12739840

申请日：2007-12-21

申请人： Paolo Martelli ,  Mario Martinelli ,  Aldo Righetti

发明人： Paolo Martelli ,  Mario Martinelli ,  Aldo Righetti

IPC分类号： G02B5/30

CPC分类号： H04J14/06 ,  G02B5/3083 ,  G02F1/0121 ,  G02F1/0136

摘要： A method of stabilizing the state of polarization of an optical radiation comprises: 1) applying sequentially to the optical radiation a first and a second controllable phase retardation; 2) detecting an optical power of at least a first polarized portion of the optical radiation obtained after step 1; 3) applying sequentially to the optical radiation obtained after step 1 a third and a fourth controllable phase retardation; 4) detecting an optical power of a further polarized portion of the optical radiation obtained after step 3; 5) controlling, responsive to the optical power of said first polarized portion, the second controllable phase retardation so as to maintain the polarization state of the optical radiation obtained after step 1 at a defined great circle r on a Poincare sphere; 6) in case the second controllable phase retardation reaches a first limit value, commuting the first controllable phase retardation between first and second values; 7) controlling, responsive to the optical power of said further polarized portion, the fourth controllable phase retardation so as to maintain the polarization state of the optical radiation obtained after step 3 at a defined state of polarization; 8) in case the fourth controllable phase retardation reaches a second limit value, commuting the third controllable phase retardation between third and fourth values, keeping constant the first controllable phase retardation while the third controllable phase retardation is commuting between said third and fourth values. A polarization stabilizing device based on the method above is also disclosed.

摘要翻译： 稳定光辐射的偏振状态的方法包括：1）顺序地施加到光辐射第一和第二可控相位延迟; 2）检测在步骤1之后获得的光辐射的至少第一极化部分的光功率; 3）顺序地施加到在步骤1之后获得的光辐射，第三和第四可控相位延迟; 4）检测在步骤3之后获得的光辐射的另一极化部分的光功率; 5）响应于所述第一极化部分的光功率控制第二可控相位延迟，以便将在步骤1之后获得的光辐射的极化状态保持在庞加莱球上的确定的大圆圈r; 6）在第二可控相位延迟达到第一极限值的情况下，使第一和第二值之间的第一可控相位延迟相乘; 7）响应于所述另外的偏振部分的光焦度来控制第四可控相位延迟，以便将在步骤3之后获得的光辐射的偏振状态保持在限定的偏振状态; 8）在第四可控相位延迟达到第二极限值的情况下，使第三和第四值之间的第三可控相位延迟通过，在第三可控相位延迟在所述第三和第四值之间通勤时，保持第一可控相位延迟恒定。 还公开了一种基于上述方法的偏振稳定装置。

公开(公告)号：US20100266291A1

公开(公告)日：2010-10-21

申请号：US12739842

申请日：2007-12-06

申请人： Pierpaolo Boffi ,  Lucia Marazzi ,  Paolo Martelli ,  Paola Parolari ,  Aldo Righetti

发明人： Pierpaolo Boffi ,  Lucia Marazzi ,  Paolo Martelli ,  Paola Parolari ,  Aldo Righetti

IPC分类号： H04B10/00

CPC分类号： H04B10/6161 ,  H04B10/61 ,  H04B10/6162 ,  H04B10/63 ,  H04B10/64

摘要： An optical communication system (100; 2300) comprises at least a transmitter (110) apt to emit a differential phase shift keying (DPSK) optical signal having a bit-rate equal to R, at least a receiving system (1200) for receiving the differential phase shift keying optical signal; and an optical link (130) optically connecting the transmitter and the receiving system for transmitting the DPSK optical signal from the transmitter to the receiving system, wherein the receiving system comprises a coherent optical receiving device (1205) apt to coherently receive the propagated DPSK optical signal and to emit at least one electrical signal (I) related to the received DPSK optical signal, and wherein the receiving system further comprises at least one electrical filter (270) for filtering the at least one electrical signal and having −3 dB double-side bandwidth greater than or equal to 0.44 R and lower than or equal to 0.68 R, and at least one squarer (280) for squaring the at least one filtered electrical signal. A related method for optical communication is also disclosed.

摘要翻译： 光通信系统（100; 2300）至少包括一个适于发射具有等于R的比特率的差分相移键控（DPSK）光信号的发射机（110），至少一接收系统（1200） 差分相移键控光信号; 以及光链路（130），其将所述发射机和所述接收系统光学连接，用于将所述DPSK光信号从所述发射机发射到所述接收系统，其中，所述接收系统包括相干光接收装置（1205），所述相干光接收装置适于相干地接收所传播的DPSK光 信号并且发射与所接收的DPSK光信号相关的至少一个电信号（I），并且其中所述接收系统还包括用于对所述至少一个电信号进行滤波并具有-3dB双频信号的至少一个电滤波器（270） 侧带宽大于或等于0.44 R且小于或等于0.68 R，以及至少一平方（280）用于平坦化至少一个滤波后的电信号。 还公开了一种用于光通信的相关方法。

公开(公告)号：USRE35697E

公开(公告)日：1997-12-23

申请号：US425390

申请日：1995-04-20

申请人： Giorgio Grasso ,  Aldo Righetti

发明人： Giorgio Grasso ,  Aldo Righetti

IPC分类号： H04B10/17 ,  G02B6/28

CPC分类号： H04B10/291 ,  H04B10/2912

摘要： A unit for amplifying light signals in optical fiber transmission lines includes a fiber optical amplifier to which light signals are transmitted through an input optical fiber line, and from which the signals, after having been amplified, are introduced into an output optical fiber line. First and second optical insulators are interposed between the fiber optical amplifier and the input and output lines to prevent the transmission of optical noise signals from the input and output lines, respectively, to the amplifier.

摘要翻译： 用于在光纤传输线路中放大光信号的单元包括：光信号通过输入光纤线路传输的光纤放大器，放大后的信号从该光放大器引入输出光纤线路。 第一和第二光绝缘体插入在光纤放大器和输入和输出线之间，以防止光输入和输出线分别将光噪声信号传输到放大器。