公开(公告)号：US5161050A

公开(公告)日：1992-11-03

申请号：US642221

申请日：1991-01-16

申请人： Giorgio Grasso ,  Aldo Righetti

发明人： Giorgio Grasso ,  Aldo Righetti

IPC分类号： G02B6/00 ,  G02B6/28 ,  G02F1/35 ,  G02F1/39 ,  H01P1/16 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/08 ,  H01S3/094 ,  H01S3/10 ,  H01S3/108 ,  H01S3/16 ,  H04B10/17

CPC分类号： H04B10/291 ,  H01S3/06708 ,  H04B10/2912 ,  H01S3/08045 ,  H01S3/094065

摘要： An optical amplifier, particularly useful for optical fiber telecommunication lines, which includes an active fiber doped with a fluorescent dopant which provides light energy emission at the wavelength of the transmission signals when the latter signals are applied thereto. One section of telecommunication line is connected to one input of a dichroic coupler, the output of which is connected to one end of the active fiber and the other input of which is connected to a source of pumping energy at a wavelength lower than that of the transmission signals. The other end of the active fiber is connected to another section of the telecommunication line. In rectilinear form, the active fiber provides single-mode propagation of the energy at the signal wavelength and multi-mode propagation of energy at the pumping energy wavelength. However, the active fiber is bent to a radius of curvature for at least 70% of its length which will provide only fundamental mode propagation at the pumping energy wavelength which also reduces the mode diameter for the transmission signals.

摘要翻译： 一种特别适用于光纤通信线路的光放大器，其包括掺杂有荧光掺杂剂的有源光纤，当将后一种信号施加于该光放大器时，其提供在传输信号波长处的光能发射。 电信线路的一部分连接到二向色耦合器的一个输入端，二极管耦合器的输出端连接到有源光纤的一端，另一个输入端连接到波长比波长 传输信号。 有源光纤的另一端连接到电信线路的另一部分。 在直线形式中，有源光纤在信号波长处提供能量的单模传播，并且在泵浦能量波长处提供能量的多模式传播。 然而，有源光纤弯曲到其长度的至少70％的曲率半径，其仅在泵浦能量波长处仅提供基模传播，这也降低了传输信号的模式直径。

公开(公告)号：US5119229A

公开(公告)日：1992-06-02

申请号：US602364

申请日：1990-10-22

申请人： Giorgio Grasso ,  Aldo Righetti ,  Flavio Fontana

发明人： Giorgio Grasso ,  Aldo Righetti ,  Flavio Fontana

IPC分类号： G02F1/35 ,  G02B6/28 ,  G02B6/34 ,  G02F1/39 ,  H01S3/06 ,  H01S3/07 ,  H01S3/0915 ,  H01S3/094 ,  H01S3/17 ,  H01S3/30 ,  H04B10/04 ,  H04B10/06 ,  H04B10/12 ,  H04B10/142 ,  H04B10/152

CPC分类号： H01S3/094003 ,  G02B6/2821

摘要： An optical amplifier (3) in accordance with the invention consists of the assembly of a length of active-core optical fiber (8), single-mode to both pumping and signal optical radiations, and a dichroic coupler (6) which includes two optical fiber lengths (9, 10), both single-mode to pumping and signal optical radiations, coupled to each other over one portion (11) by fusion of the respective claddings and substantial setting in common of the respective cores in the fused portion (11).

公开(公告)号：US20100232802A1

公开(公告)日：2010-09-16

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 ,  H04B10/04

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

摘要： Optical transmission system (200) comprising: an optical source (210) adapted to generate a modulated optical signal having an optical spectrum and a dispersion robustness; an optical dispersion compensation filter (250) optically connected to the optical source, comprising at least two cascaded optical resonators and having a periodic transfer function that is rigidly translatable in the frequency spectrum and characterized by a free spectral range (FSR); a control system (270; 280; 260) adapted to act on the optical compensation filter in order rigidly to translate said transfer function along the frequency spectrum in a first and in a second position in such a way that: in a first position in the frequency spectrum of said transfer function, the mean chromatic dispersion weighted over said optical spectrum of the modulated signal is greater, in absolute value, than the value of dispersion robustness; in a second position in the frequency spectrum of said transfer function, the mean chromatic dispersion weighted over said optical spectrum of the modulated signal is smaller, in absolute value, than the value of dispersion robustness; in the first and in the second position the mean slope of the chromatic dispersion weighted over said optical spectrum of the modulated signal is smaller, in absolute terms, than 300000 ps/nm2, where the translation of said transfer function between the first and the second position is smaller than said FSR.

摘要翻译： 光传输系统（200）包括：光源（210），适于产生具有光谱和色散鲁棒性的调制光信号; 光学连接到光源的光学色散补偿滤波器（250），包括至少两个级联的光学谐振器，并且具有在频谱中可刚性地平移的周期性传递函数，并且由自由光谱范围（FSR）表征。 控制系统（270; 280; 260），其适于作用在所述光学补偿滤波器上，以便在第一和第二位置中沿着所述频谱平移所述传递函数，使得在所述光学补偿滤波器中的第一位置处于 所述传递函数的频谱，在调制信号的所述光谱上加权的平均色散比绝对值大于色散鲁棒性的值; 在所述传递函数的频谱中的第二位置，在所述调制信号的所述光谱上加权的平均色散比绝对值小于分散鲁棒性的值; 在第一位置和第二位置，在调制信号的所述光谱上加权的色散的平均斜率绝对值小于300000ps / nm2，其中所述第一和第二信号之间的所述传递函数的平移 位置小于所述FSR。

公开(公告)号：US5497265A

公开(公告)日：1996-03-05

申请号：US162651

申请日：1993-12-06

申请人： Flavio Fontana ,  Aldo Righetti ,  Giorgio Grasso

发明人： Flavio Fontana ,  Aldo Righetti ,  Giorgio Grasso

IPC分类号： H01S3/07 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/10 ,  H04B10/02 ,  H04B10/04 ,  H04B10/06 ,  H04B10/14 ,  H04B10/26 ,  H04B10/28 ,  H04B10/00

CPC分类号： H01S3/067 ,  H01S3/06754 ,  H01S3/094003

摘要： An optical signal generator for telecommunication systems, comprising at least a single-frequency active optical fiber laser as an optical signal source at a signal transmission wavelength, at least an active optical fiber optical amplifier operatively connected to said laser and at least one source of pumping optical power at a pumping wavelength, the pumping optical power source being operatively connected to at least one of said active fibers of said laser and amplifier and transfer-means for said pumping optical power being connected to said active fibers of said laser and amplifier, in order to transfer unabsorbed optical power at the pumping wavelength from one of said active fibers to the other of said active fibers.

摘要翻译： 一种用于电信系统的光信号发生器，包括至少一个单频有源光纤激光器作为信号传输波长的光信号源，至少一个可操作地连接到所述激光器的有源光纤光放大器和至少一个泵浦源 泵浦光功率可操作地连接到所述激光器和放大器的所述有源光纤中的至少一个，并且用于所述泵浦光功率的转移装置被连接到所述激光器和放大器的所述有源光纤， 以将泵浦波长的未吸收光功率从所述活性纤维之一转移到所述活性纤维中的另一个。

公开(公告)号：US5204923A

公开(公告)日：1993-04-20

申请号：US839056

申请日：1992-02-18

申请人： Giorgio Grasso ,  Aldo Righetti

发明人： Giorgio Grasso ,  Aldo Righetti

IPC分类号： G02B6/42 ,  H01S3/00 ,  H01S3/067 ,  H04B10/17

CPC分类号： H04B10/2912 ,  G02B6/4208 ,  H01S3/0064 ,  H01S3/06754 ,  H01S2301/02

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。

公开(公告)号：US06191854B1

公开(公告)日：2001-02-20

申请号：US09102759

申请日：1998-06-23

申请人： Giorgio Grasso ,  Aldo Righetti ,  Paolo Ottolenghi ,  Fabio Donati

发明人： Giorgio Grasso ,  Aldo Righetti ,  Paolo Ottolenghi ,  Fabio Donati

IPC分类号： H01S300

CPC分类号： H04B10/25253 ,  H04B2210/252

摘要： Optical telecommunications system, comprising: a transmitting station capable of emitting an optical signal having a power of between 18 and 30 dBm; an optical fibre transmission line capable of transmitting the said optical signal, comprising dispersion shifted fibre with a length of between 100 km and 1000 km; an optical receiving station, capable of receiving the said optical signal; which comprises, between the said transmission line and the said optical receiver, a chromatic dispersion compensator. Preferably the said optical fibre transmission line has a length of between 200 and 400 km.

摘要翻译： 光通信系统，包括：能够发射功率在18和30dBm之间的光信号的发射台;能够传输所述光信号的光纤传输线，包括长度在100公里和 1000km;能够接收所述光信号的光接收站;在所述传输线和所述光接收器之间包括色散补偿器。优选地，所述光纤传输线的长度为200-400 公里。

公开(公告)号：US5638204A

公开(公告)日：1997-06-10

申请号：US156880

申请日：1993-11-23

申请人： Giorgio Grasso ,  Aldo Righetti ,  Fausto Meli

发明人： Giorgio Grasso ,  Aldo Righetti ,  Fausto Meli

IPC分类号： H01S3/067 ,  H01S3/094 ,  H01S3/16 ,  H01S3/00 ,  G02B6/10

CPC分类号： H01S3/06708 ,  H01S3/094011 ,  H01S3/1693

摘要： An optical fiber power amplifier, particularly for telecommunication lines with optical fibers, including an active fiber doped with Erbium as a fluorescing substance, and with Al.sub.2 O.sub.3 as refraction index modifying dopant. The fiber is pumped with a laser providing a wavelength higher than 520 nm and preferably, 980 nm. The amplifier has a particularly high amplification efficiency close to the theoretical maximum efficiency.

摘要翻译： 一种光纤功率放大器，特别是用于具有光纤的电信线路，包括掺杂有铒作为荧光物质的有源光纤，以及Al 2 O 3作为折射率修饰掺杂剂。 纤维用提供高于520nm，优选980nm的波长的激光器泵送。 该放大器具有接近理论最大效率的特别高的放大效率。

公开(公告)号：US5210808A

公开(公告)日：1993-05-11

申请号：US699920

申请日：1991-05-14

申请人： Giorgio Grasso ,  Aldo Righetti

发明人： Giorgio Grasso ,  Aldo Righetti

IPC分类号： G02B6/42 ,  H01S3/00 ,  H01S3/067 ,  H04B10/17 ,  H04B9/00 ,  G02B6/26

CPC分类号： H04B10/291 ,  G02B6/4208 ,  H01S3/0064 ,  H01S3/06754 ,  H04B10/2912 ,  H01S2301/02

摘要： Active-fiber optical amplifier connected to optical fiber lines or a telecommunication signal source through energy reflection limiting means, such as optical isolators, for limiting the reflected energy, due to Rayleigh scattering, which reaches the active fiber, to permit increased amplifier gain. The input of the active fiber is connected to a dichroic coupler which is also connected to a pumping energy source by an optical fiber having a bevelled end surface or an antireflection coating at the energy source end to limit reflection of energy to the active fiber. Also, a telecommunication system including one or more of such protected amplifiers.

摘要翻译： 通过能量反射限制装置（例如光隔离器）连接到光纤线路或电信信号源的有源光纤放大器，用于限制由于到达有源光纤的瑞利散射引起的反射能量，以允许增加的放大器增益。 有源光纤的输入端连接到二向色耦合器，该二向色耦合器也通过在能量源端具有倾斜端面或抗反射涂层的光纤连接到泵浦能源，以限制能量对有源光纤的反射。 而且，包括这种受保护放大器中的一个或多个的电信系统。

公开(公告)号：US5054876A

公开(公告)日：1991-10-08

申请号：US555941

申请日：1990-07-20

申请人： Giorgio Grasso ,  Aldo Righetti ,  Flavio Fontana

发明人： Giorgio Grasso ,  Aldo Righetti ,  Flavio Fontana

IPC分类号： G02B6/44 ,  G02B6/00 ,  G02F1/35 ,  H01S3/06 ,  H01S3/067 ,  H01S3/08 ,  H01S3/094 ,  H01S3/10 ,  H04B3/46 ,  H04B10/00 ,  H04B17/02

CPC分类号： H04B10/2931 ,  H04B10/032 ,  H04B10/0775 ,  H04B10/0777 ,  H04B10/291 ,  H04B10/2912 ,  H01S3/06754 ,  H01S3/09408 ,  H04B2210/071 ,  H04B2210/074 ,  H04B2210/075

摘要： An optical fiber telecommunication line composed of a number of series connected optical cables arranged end-to-end includes an active core optical fiber amplifier for the transmitted signals between each adjacent pair of optical cables. Two pumping optical radiation sources are connected to each active core optical fiber within each of the amplifiers, one source for each end of a single active core optical fiber. One of these two sources is placed into service and the second one is kept in reserve to be placed into service if the first one fails. A microprocessing circuit causes the sources to send distinctive recognizable alarm signals indicative of the state of an associated amplifier to terminal stations at the ends of the line and to receive therefrom control signals to control and exchange the functions between the two sources as necessary.

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。