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公开(公告)号：US20100266291A1
公开(公告)日：2010-10-21
申请号：US12739842
申请日：2007-12-06
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。
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公开(公告)号：US5355250A
公开(公告)日：1994-10-11
申请号：US84770
申请日：1993-06-29
申请人： Giorgio Grasso , Aldo Righetti , Mario Tamburello
发明人： Giorgio Grasso , Aldo Righetti , Mario Tamburello
IPC分类号： G02F1/35 , H01S3/00 , H01S3/06 , H01S3/07 , H01S3/094 , H04B10/08 , H04B10/16 , H04B10/17 , H01S3/10 , H01J5/16 , H04B9/00
CPC分类号： H04B10/2931 , H04B10/077 , H04B10/07955
摘要： The telecommunication line comprises at least one terminal station having an optical-signal transmitter and an optical-signal receiver, which are operationally connected by an automatic protection device suitable for shutting down said transmitter in the absence of a received optical signal, at least one opticalfibre line for the transmission of the optical signals transmitted by said transmitter and received by said receiver, and at least one optical amplifier included in said line. With said optical amplifier there are associated means for the detection of the presence of light energy at input and means for causing the shut down of the amplifier, which in the absence of light energy at input are caused by said detection means to interrupt substantially any emission of light energy on the part of said optical amplifier.
摘要翻译： 电信线路包括至少一个具有光信号发射机和光信号接收机的终端站，该终端站由适用于在没有接收到的光信号的情况下关闭所述发射机的自动保护装置可操作地连接至少一个光纤 用于由所述发射机发送并由所述接收机接收的光信号的传输线，以及包括在所述线路中的至少一个光放大器。 对于所述光放大器，存在用于检测输入处的光能的存在的相关装置和用于引起放大器关闭的装置，在放大器的输入不存在光能的情况下，由所述检测装置基本上中断任何发射 的所述光放大器的一部分上的光能。
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公开(公告)号：US5245467A
公开(公告)日：1993-09-14
申请号：US891680
申请日：1992-05-28
申请人： Giorgio Grasso , Aldo Righetti , Flavio Fontana
发明人： Giorgio Grasso , Aldo Righetti , Flavio Fontana
CPC分类号： H01S3/06708 , H01S3/06754 , H01S3/17 , H01S2301/04 , H01S3/094011 , H01S3/1693 , H01S3/1698
摘要： An optical fiber and an optical amplifier, in particular for optical fiber telecommunication lines operating with a transmission signal in a predetermined wavelength range. The amplifier comprises laser emitting active optical fiber doped with erbium and a further doping substance, distributed along the fiber. The further doping substance has an absorption for a light having a wavelength lower than 1,540 nm substantially higher than the absorption that the further doping substance shows for a light having a wavelength varying from 1,540 nm to the upper limit of the predetermined wavelength range of the transmission signal. Preferably, the further doping substance is samarium. Samarium contained in the fiber is capable of absorbing the spontaneous erbium emission, which would constitute a noise source, thereby allowing a communication signal to be amplified in a wavelength range corresponding substantially to the tolerance range of the commercially available laser light emitters used as the communication signal source.
摘要翻译： 光纤和光放大器，特别是用于以预定波长范围的传输信号工作的光纤通信线路。 放大器包括掺杂有铒的激光发射有源光纤和沿着光纤分布的另外的掺杂物质。 进一步的掺杂物质对于波长低于1540nm的光的吸收，其显着高于进一步的掺杂物质对于具有从1540nm变化到传输的预定波长范围的上限的光的显示的吸收， 信号。 优选地，另外的掺杂物质是钐。 包含在纤维中的钐能够吸收构成噪声源的自发铒发射，从而允许通信信号在基本上对应于用作通信的市售激光发射器的公差范围内的波长范围内被放大 信号源。
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14.发明授权公开(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
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。
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15.发明授权
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
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。
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16.发明授权
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。
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17.再颁专利
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
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。
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18.发明授权
公开(公告)号：US5278686A
公开(公告)日：1994-01-11
申请号：US846276
申请日：1992-03-02
申请人： Giorgio Grasso , Aldo Righetti , Mario Tamburello
发明人： Giorgio Grasso , Aldo Righetti , Mario Tamburello
CPC分类号： H04B10/291 , H04B10/077 , H04B10/07955
摘要： An optical fiber telecommunications system having two terminals interconnected by optical fibers and active-fiber optical amplifiers. Each terminal has an optical telecommunication signal transmitter associated with an optical signal receiver which are interconnected by a protective device which causes the transmitter to be inoperative when its associated receiver does not receive an optical signal. Optical switches are provided at the downstream sides of active-fiber optical amplifiers and are controlled by detecting devices coupled to amplifier outputs, each of which detecting devices opens the associated switch in the absence of a signal having the characteristics, e.g. an alternating component, of the optical telecommunication signal whereby the protective devices are operated.
摘要翻译： 具有通过光纤和有源光纤光放大器互连的两个端子的光纤通信系统。 每个终端具有与光信号接收器相关联的光通信信号发射器，其通过保护装置互连，当其相关接收机没有接收到光信号时，该保护装置使得发射机不起作用。 光开关设置在有源光纤光放大器的下游侧，并通过耦合到放大器输出的检测装置进行控制，每个检测装置在没有具有特性的信号的情况下打开关联的开关。 光通信信号的交替分量，由此保护装置被操作。
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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。
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20.发明授权
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).
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