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    • 1. 发明专利
    • Optical transmission apparatus
    • 光传输装置
    • JP2006279610A
    • 2006-10-12
    • JP2005096531
    • 2005-03-29
    • Fujitsu Ltd富士通株式会社
    • ONAKA YOSHINORISUGAYA YASUSHIOOI HIROMI
    • H04B10/00H04B10/077H04B10/079H04B10/2507H04B10/2525H04B10/2537H04B10/2543H04B10/27H04B10/29H04B10/296H04B10/297H04J14/00H04J14/02
    • H04J14/0221H04B10/296H04B2210/003H04B2210/256H04J14/0201H04J14/0212
    • PROBLEM TO BE SOLVED: To provide an optical transmission apparatus capable of reducing the initial introduction cost, flexibly extending its function in response to the tendency of high power and a long distance and realizing OSNR improvement at a low cost at extending the function. SOLUTION: The optical transmission apparatus includes an OADM 102 located on an optical transmission line 101 and adding and dropping an optical signal; a Preamplifier section 103 located at a pre-stage of the OADM 102; and a post amplifier section 104 located at a post-stage of the OADM 102. The Post amplifier section 104 includes: a dispersion compensation fiber 111 and an excitation light multiplexer 124a located at the post stage of the OADM 102; and an excitation light source 125a connected to the excitation light multiplexer 124a at the extension of the function of the optical transmission apparatus and for applying Raman amplification to the dispersion compensation fiber 111. The Preamplifier section 103 includes a excitation light multiplexer 114a and an excitation light source 115a connected at the extension of the function of the optical transmission apparatus and for applying Raman amplification to the signal on the transmission line 101. COPYRIGHT: (C)2007,JPO&INPIT
    • 要解决的问题:为了提供能够降低初始引入成本的光传输装置,响应于高功率和长距离的趋势灵活地扩展其功能,并且在扩展功能的同时以低成本实现OSNR的改进 。 光传输装置包括:位于光传输线101上的OADM 102,并且添加和删除光信号; 位于OADM 102的前级的前置放大器部分103; 以及位于OADM 102的后级的后置放大器部分104.后置放大器部分104包括:位于OADM 102的后级的色散补偿光纤111和激发光复用器124a; 以及在光传输装置的功能扩展处连接到激发光多路复用器124a并用于向色散补偿光纤111施加拉曼放大的激发光源125a。前置放大器部分103包括激发光多路复用器114a和激发光 源115a,其连接在光传输装置的功能的扩展上,并用于对传输线101上的信号进行拉曼放大。版权所有(C)2007,JPO&INPIT
    • 2. 发明专利
    • Optical fiber amplifier
    • 光纤放大器
    • JP2006245623A
    • 2006-09-14
    • JP2006168829
    • 2006-06-19
    • Fujitsu Ltd富士通株式会社
    • KINOSHITA SUSUMU
    • H01S3/06
    • H04B2210/256
    • PROBLEM TO BE SOLVED: To efficiently use residual excitation light power, while securing stable operation of an exciting light source, and to enhance a conversion efficiency. SOLUTION: This arrangement comprises a first means which diverges an excitation light power into n:1 (n is a real number of 1 or larger) by a light divergence part 23, combines waves of excitation lights of one port of the light divergence part 23 by a first optical coupler 24-1, and enters them into one rare-earth doped fiber 21-1 of a first rare-earth doped fiber 21-1 and a second rare-earth doped fiber 21-2; a second means which is connected to the other end of the rare-earth doped fiber 21-1 to extract the residual excitation power by a second optical coupler 24-2, combines waves by a third optical coupler 24-3, and enters them from one end of the other rare-earth doped fiber 21-2; and a third means for combining waves of the excitation power of the other port, diverged by the light divergence part 23 from the other end of the rare-earth doped fiber 21-2 by a fourth optical coupler 24-4. COPYRIGHT: (C)2006,JPO&NCIPI
    • 要解决的问题:在确保激发光源的稳定操作的同时,有效地使用剩余激发光功率,并提高转换效率。 解决方案:该装置包括通过光发散部分23将激发光功率分散成n:1(n为1或更大的实数)的第一装置,将光的一个端口的激发光的波组合 通过第一光耦合器24-1将发散部23输入到第一稀土掺杂光纤21-1和第二稀土掺杂光纤21-2的稀土掺杂光纤21-1中, 连接到稀土掺杂光纤21-1的另一端以通过第二光耦合器24-2提取剩余激发功率的第二装置通过第三光耦合器24-3组合波并将其从 另一个稀土掺杂光纤21-2的一端; 以及第三装置,其通过第四光耦合器24-4将由光发散部分23发散的另一端口的激励功率波与稀土掺杂光纤21-2的另一端发射。 版权所有(C)2006,JPO&NCIPI
    • 9. 发明专利
    • Optical fiber amplifier
    • 光纤放大器
    • JP2008053756A
    • 2008-03-06
    • JP2007292409
    • 2007-11-09
    • Fujitsu Ltd富士通株式会社
    • KINOSHITA SUSUMU
    • H01S3/06
    • H04B2210/256
    • PROBLEM TO BE SOLVED: To secure stable operation of an excitation light source to efficiently utilize residual excitation optical power. SOLUTION: An optical fiber amplifier is provided with an excitation light source 32, an optical circulator 33 having three or more ports connected with the excitation light source 32, a first optical coupler 34-1 for combining excitation lights coming through the excitation light source 32 and optical circulator 33 to incident into a rare earth dope fiber, a second optical coupler 34-2 for separating the residual excitation light arrived at the other end of the rare earth dope fiber, a reflection mirror 35 for reflecting the separated residual excitation light to return it again into the rare earth dope fiber through the second optical coupler 34-2, a detector 36 of the residual excitation light for detecting the residual excitation light which is returned by reflection and input to the optical circulator 33 through one end of the rare earth dope fiber and the first optical coupler 34-1, and a controller 37 for controlling the excitation light source 32 so that the detected residual excitation light becomes constant. COPYRIGHT: (C)2008,JPO&INPIT
    • 要解决的问题:确保激发光源的稳定运行,以有效利用残余激发光功率。 解决方案:光纤放大器设置有激发光源32,具有与激发光源32连接的三个或更多个端口的光环行器33,用于组合通过激励的激发光的第一光耦合器34-1 光源32和入射到稀土掺杂纤维中的光循环器33,用于分离到达稀土掺杂纤维另一端的剩余激发光的第二光耦合器34-2,用于反射分离残留物的反射镜35 激发光通过第二光耦合器34-2再次返回到稀土掺杂纤维中,残留激发光的检测器36用于检测通过反射返回并通过一端输入到光循环器33的残余激发光 的稀土掺杂纤维和第一光耦合器34-1,以及用于控制激发光源32的控制器37,使得检测到的残留物 激发光变得恒定。 版权所有(C)2008,JPO&INPIT
    • 10. 发明专利
    • Optical amplifier and optical fiber
    • 光放大器和光纤
    • JP2007005484A
    • 2007-01-11
    • JP2005182425
    • 2005-06-22
    • Fujitsu Ltd富士通株式会社
    • SUKUNAMI NOBUFUMIINAGAKI SHINYA
    • H01S3/10
    • H01S3/06754H01S3/0064H01S3/06725H01S3/06729H01S3/06758H01S3/094011H01S3/09415H01S2301/04H04B10/291H04B2210/003H04B2210/256
    • PROBLEM TO BE SOLVED: To improve the quality of WDM transmission by reducing four light-wave mixture. SOLUTION: An optical fiber 11 has positive wavelength dispersion in a signal bandpass, and becomes an optical amplification medium which amplifies a wavelength multiplexing signal in which two or more wavelengths are multiplexed. An excitor 12 enters the excitation light into the optical fiber 11. In order to obtain the phase mismatching property of a wavelength to be transmitted, the optical fiber 11 has positive wavelength dispersion as a wavelength dispersion in a signal bandpass where the difference gets larger between the signal frequency which is the frequency of a signal to be amplified and the zero dispersion frequency wherein the wavelength dispersion becomes zero, so that it may function as an optical amplification medium capable of suppressing the generation of four light-wave mixture. COPYRIGHT: (C)2007,JPO&INPIT
    • 要解决的问题:通过减少四个光波混合来提高WDM传输的质量。 解决方案:光纤11在信号带通中具有正波长色散,并且成为放大其中多个波长的波长多路复用信号的光放大介质。 激光器12将激发光进入光纤11.为了获得要透射的波长的相位失配特性,光纤11具有作为信号带通中的波长色散的正波长色散,其中差异在 作为要放大的信号的频率的信号频率和波长色散变为零的零色散频率,使得其可以用作能够抑制四种光波混合的产生的光学放大介质。 版权所有(C)2007,JPO&INPIT