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    Raman amplifier, optical repeater, and raman amplification method
    51.
    发明申请
    Raman amplifier, optical repeater, and raman amplification method 有权
    拉曼放大器，光中继器和拉曼放大法

    公开(公告)号：US20020085267A1

    公开(公告)日：2002-07-04

    申请号：US09886211

    申请日：2001-06-22

    Applicant: THE FURUKAWA ELECTRIC CO., LTD

    Inventor： Youichi Akasaka ,  Yoshihiro Emori ,  Shu Namiki

    IPC: H01S003/00

    CPC classification number: H01S3/302 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/0912 ,  H01S3/094011 ,  H01S3/094015 ,  H01S3/094096 ,  H01S3/10007 ,  H01S3/10015 ,  H01S3/2375 ,  H01S3/2383 ,  H01S2301/04 ,  H04B10/2916

    Abstract: A Raman amplifier according to the present invention comprises a plurality of pumping means using semiconductor lasers of Fabry-Perot, DFB, or DBR type or MOPAs, and pumping lights outputted from the pumping means have different central wavelengths, and interval between the adjacent central wavelength is greater than 6 nm and smaller than 35 nm. An optical repeater according to the present invention comprises the above-mentioned Raman amplifier and adapted to compensate loss in an optical fiber transmission line by the Raman amplifier. In a Raman amplification method according to the present invention, the shorter the central wavelength of the pumping light the higher light power of said pumping light. In the Raman amplifier according to the present invention, when a certain pumping wavelength is defined as a first channel, and second to n-th channels are defined to be arranged with an interval of about 1 THz toward a longer wavelength side, the pumping lights having wavelengths corresponding to the first to n-th channels are multiplexed, and an pumping light having a wavelength spaced apart from the n-th channel by 2 THz or more toward the longer wavelength side is combined with the multiplexed light, thereby forming the pumping light source. The pumping lights having wavelengths corresponding to the channels other than (n-1)-th and (n-2)-th channels may be multiplexed, thereby forming the pumping light source. The pumping lights having wavelengths corresponding to the channels other than (n-2)-th and (n-3)-th channels may be multiplexed, thereby forming the pumping light source.

    Abstract translation: 根据本发明的拉曼放大器包括使用Fabry-Perot，DFB或DBR型或MOPA的半导体激光器的多个泵浦装置，并且从泵送装置输出的泵浦光具有不同的中心波长，并且相邻中心波长 大于6nm且小于35nm。 根据本发明的光中继器包括上述拉曼放大器，并且用于补偿拉曼放大器在光纤传输线路中的损耗。 在根据本发明的拉曼放大方法中，泵浦光的中心波长越短，所述泵浦光的光功率越高。 在根据本发明的拉曼放大器中，当将一定的泵浦波长定义为第一通道时，并且将第二至第n通道限定为朝向较长波长侧以大约1THz的间隔布置，泵浦灯 具有对应于第一至第n通道的波长的多路复用，并且将具有与第n个信道间隔开2波长或更长的波长朝向较长波长侧的波长的泵浦光与多路复用光组合，从而形成泵浦 光源。 具有与第（n-1）和（n-2）通道以外的通道对应的波长的泵浦光可以被多路复用，从而形成泵浦光源。 具有与第（n-2）和（n-3）通道以外的通道对应的波长的泵浦光可以被多路复用，从而形成泵浦光源。

    METHOD AND APPARATUS FOR REDUCING POLARIZATION DEPENDENT GAIN IN RAMAN AMPLIFICATION
    52.
    发明申请
    METHOD AND APPARATUS FOR REDUCING POLARIZATION DEPENDENT GAIN IN RAMAN AMPLIFICATION 有权
    用于减少拉曼放大中偏振相关增益的方法和装置

    公开(公告)号：US20020075560A1

    公开(公告)日：2002-06-20

    申请号：US09536367

    申请日：2000-03-27

    Inventor： Dmitri Foursa

    IPC: H01S003/00

    CPC classification number: H01S3/06754 ,  H01S3/094003 ,  H01S3/094096 ,  H01S3/09415 ,  H01S3/10007 ,  H01S3/10061 ,  H01S3/302 ,  H01S2301/06

    Abstract: A method and apparatus for providing broad band Raman amplification with reduced dependence on polarization state and wavelength. Pump beams of adjacent wavelength are perpendicularly polarized to each other. Further, the wavelength spacing between adjacent pump beams is chosen for the given fiber wavelength spectrum and distance between repeater stations such that adjacent pump beams experience the same polarization state evolution as they travel through the fiber.

    Abstract translation: 用于提供宽带拉曼放大的方法和装置，其具有减少对极化状态和波长的依赖性。 相邻波长的泵浦波束彼此垂直极化。 此外，为给定的光纤波长频谱和中继站之间的距离选择相邻泵浦波束之间的波长间隔，使得相邻泵浦波束在穿过光纤时经历相同的极化状态演变。

    Raman amplifier, optical repeater, and Raman amplification method
    53.
    发明申请
    Raman amplifier, optical repeater, and Raman amplification method 有权
    拉曼放大器，光中继器和拉曼放大法

    公开(公告)号：US20020021487A1

    公开(公告)日：2002-02-21

    申请号：US09944601

    申请日：2001-09-04

    Applicant: THE FURUKAWA ELECTRIC CO., LTD.

    Inventor： Youichi Akasaka ,  Yoshihiro Emori ,  Shu Namiki

    IPC: H01S003/00

    CPC classification number: H01S3/302 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/0912 ,  H01S3/094011 ,  H01S3/094015 ,  H01S3/094096 ,  H01S3/10007 ,  H01S3/10015 ,  H01S3/2375 ,  H01S3/2383 ,  H01S2301/04 ,  H04B10/2916

    Abstract: A Raman amplifier according to the present invention comprises a plurality of pumping means using semiconductor lasers of Fabry-Perot, DFB, or DBR type or MOPAs, and pumping lights outputted from the pumping means have different central wavelengths, and interval between the adjacent central wavelength is greater than 6 nm and smaller than 35 nm. An optical repeater according to the present invention comprises the above-mentioned Raman amplifier and adapted to compensate loss in an optical fiber transmission line by the Raman amplifier. In a Raman amplification method according to the present invention, the shorter the central wavelength of the pumping light the higher light power of said pumping light. In the Raman amplifier according to the present invention, when a certain pumping wavelength is defined as a first channel, and second to n-th channels are defined to be arranged with an interval of about 1 THz toward a longer wavelength side, the pumping lights having wavelengths corresponding to the first to n-th channels are multiplexed, and an pumping light having a wavelength spaced apart from the n-th channel by 2 THz or more toward the longer wavelength side is combined with the multiplexed light, thereby forming the pumping light source. The pumping lights having wavelengths corresponding to the channels other than (nnull1)-th and (nnull2)-th channels may be multiplexed, thereby forming the pumping light source. The pumping lights having wavelengths corresponding to the channels other than (nnull2)-th and (nnull3)-th channels may be multiplexed, thereby forming the pumping light source.

    Abstract translation: 根据本发明的拉曼放大器包括使用Fabry-Perot，DFB或DBR型或MOPA的半导体激光器的多个泵浦装置，并且从泵送装置输出的泵浦光具有不同的中心波长，并且相邻中心波长 大于6nm且小于35nm。 根据本发明的光中继器包括上述拉曼放大器，并且用于补偿拉曼放大器在光纤传输线路中的损耗。 在根据本发明的拉曼放大方法中，泵浦光的中心波长越短，所述泵浦光的光功率越高。 在根据本发明的拉曼放大器中，当将一定的泵浦波长定义为第一通道时，并且将第二至第n通道限定为朝向较长波长侧以大约1THz的间隔布置，泵浦灯 具有对应于第一至第n通道的波长的多路复用，并且将具有与第n个信道间隔开2波长或更长的波长朝向较长波长侧的波长的泵浦光与多路复用光组合，从而形成泵浦 光源。 具有与第（n-1）和（n-2）通道以外的通道对应的波长的泵浦光可以被多路复用，从而形成泵浦光源。 具有与第（n-2）和（n-3）通道以外的通道对应的波长的泵浦光可以被多路复用，从而形成泵浦光源。

    Optical switch, optical amplifier and optical power controller as well as optical add-drop multiplexer
    54.
    发明申请
    Optical switch, optical amplifier and optical power controller as well as optical add-drop multiplexer 失效
    光开关，光放大器和光功率控制器以及光分插复用器

    公开(公告)号：US20020003644A1

    公开(公告)日：2002-01-10

    申请号：US09939665

    申请日：2001-08-28

    Applicant: NEC Corporation

    Inventor： Hirofumi Shimomura ,  Seigo Takahashi ,  Naoya Henmi

    IPC: G02B006/26 ,  G02B006/42 ,  H04J014/02

    CPC classification number: H04Q11/0001 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/094061 ,  H01S3/10007 ,  H01S3/1608 ,  H04J14/0204 ,  H04J14/0206 ,  H04J14/0212 ,  H04J14/0213 ,  H04J14/0221

    Abstract: The first present invention provides an optical switch including the following elements. At least a plurality of optical transmission lines are provided for transmissions of optical signals. Each of the at least plurality of optical transmission lines have at least an impurity doped fiber. At least an excitation light source is provided for emitting an excitation light. At least an excitation light switch is provided which is connected to the excitation light source and also connected to the at least plurality of optical transmission lines for individual switching operations to supply the excitation light to the at least plurality of optical transmission lines to feed the excitation light to the impurity doped fiber on the at least plurality of optical transmission lines, thereby causing an excitation of the impurity doped fiber on selected one of the at least plurality of optical transmission lines so as to permit a transmission of the optical signal through the excited impurity doped fiber, whilst unselected one of the impurity doped fibers is unexcited whereby the optical signals are absorbed into the unselected one of the impurity doped fibers thereby to discontinue transmission of the optical signal by the unselected one of the impurity doped fibers.

    Abstract translation: 第一本发明提供一种包括以下元件的光开关。 至少多个光传输线被提供用于光信号的传输。 所述至少多个光传输线中的每一个至少具有杂质掺杂光纤。 至少提供了用于发射激发光的激发光源。 至少提供激励光开关，其连接到激发光源并且还连接到用于单独切换操作的至少多个光传输线，以将激发光提供给至少多个光传输线以馈送激励 在所述至少多个光传输线上对所述杂质掺杂光纤进行光照射，从而使所述杂质掺杂光纤在所述至少多个光传输线路中的所选择的一个光纤传输线路上激发，以允许所述光信号通过所述激发 杂质掺杂光纤，而未选择的杂质掺杂光纤中的一个是未激发的，由此光信号被吸收到未选择的杂质掺杂光纤中，从而由未选择的杂质掺杂光纤中止光信号的透射。

    Optical fiber transmission system with chromatic dispersion compensation
    55.
    发明申请
    Optical fiber transmission system with chromatic dispersion compensation 有权
    具有色散补偿的光纤传输系统

    公开(公告)号：US20010048546A1

    公开(公告)日：2001-12-06

    申请号：US09903121

    申请日：2001-07-11

    Applicant: France Telecom

    Inventor： Thierry Georges ,  Daniel Le Guen ,  Francois Favre

    IPC: G02F001/295 ,  H01S003/00

    CPC classification number: H04B10/25253 ,  H01S3/06754 ,  H01S3/094042 ,  H01S3/094096 ,  H01S3/0941 ,  H01S3/10007 ,  H01S3/302 ,  H04B2210/003

    Abstract: A long-distance optical transmission system comprising pulse emitter and receiver means (1, 2) and an optical line (3) which extends between said emitter and receiver means (1, 2) and which comprises alternating segments (3a, 3b) of dispersive fibers having chromatic dispersion of opposite signs, and also having a plurality of amplifiers (4), the system being characterized in that the optical line (3) comprises a plurality of pairs of dispersive fiber segments (3a, 3b) having chromatic dispersion of opposite signs between successive amplifiers (4), and in that the cumulative dispersion C over the majority of the segments of the optical line satisfies the relationship (R)nullCnullnullnull2

    Abstract translation: 一种长距离光传输系统，包括脉冲发射器和接收器装置（1,2）和在所述发射器和接收器装置（1,2）之间延伸的光学线路（3），并且包括交替的分散的片段（3a，3b） 具有相反符号的色散的光纤，并且还具有多个放大器（4），所述系统的特征在于，所述光学线路（3）包括多对色散纤维段（3a，3b），所述分散光纤段具有相反的色散 在连续放大器（4）之间的符号，并且在光学线路的大部分段上的累积色散C满足关系<段落lvl =“0”> in-line-formula>（R）| C | DELTA＆ngr ; 2 <0.3 其中C以ps / nm表示，其中DELTA＆ngr; 是以Thz表示的脉冲的半高频谱值。

    Method for optical amplification and system for carrying out the method
    56.
    发明授权
    Method for optical amplification and system for carrying out the method 失效
    光放大方法及其实施方法

    公开(公告)号：US6097535A

    公开(公告)日：2000-08-01

    申请号：US6049

    申请日：1998-01-12

    Applicant: Takafumi Terahara

    Inventor： Takafumi Terahara

    IPC: H01S3/067 ,  H01S3/06 ,  H01S3/10 ,  H04B10/2507 ,  H04B10/296 ,  H04B10/297 ,  H01S3/00

    CPC classification number: H04B10/294 ,  H01S3/10007 ,  H01S2301/04

    Abstract: A method and system for optical amplification suitable for wavelength division multiplexing (WDM). Signal light is amplified to obtain amplified signal light. The amplified signal light is gain equalized so that a deviation in signal-to-noise ratio of the amplified signal light with respect to wavelength is reduced to obtain first equalized signal light. The first equalized signal light is amplified to obtain amplified equalized signal light. The amplified equalized signal light is gain equalized so that a deviation in signal power of the amplified equalized signal light with respect to wavelength is reduced. This method is characterized in that in performing optical amplification of signal light plural times gain equalization is performed in the middle stage of the optical amplification so that the deviation in signal-to-noise ratio is reduced, and gain equalization is performed after the final stage of the optical amplification so that the deviation in signal power is reduced. According to this method, gain equalization can be easily performed on both the deviation in signal power and the deviation in signal-to-noise ratio.

    Abstract translation: 一种适用于波分复用（WDM）的光放大方法和系统。 信号光被放大以获得放大的信号光。 放大的信号光被增益均衡，使得放大的信号光的相对于波长的信噪比的偏差减小，以获得第一均衡的信号光。 第一均衡信号光被放大以获得放大的均衡信号光。 放大后的均衡信号光被增益均衡，使得放大的均衡信号光的相对于波长的信号功率的偏差减小。 该方法的特征在于，在进行光放大的信号光的情况下，在光放大的中间阶段进行多次增益均衡化，使得信噪比的偏差降低，在最后阶段进行增益均衡 使得信号功率的偏差减小。 根据该方法，可以容易地对信号功率的偏差和信噪比的偏差进行增益均衡化。

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