公开(公告)号：US20060093293A1

公开(公告)日：2006-05-04

申请号：US10519381

申请日：2004-08-04

Applicant: Eisuke Sasaoka ,  Yoshinori Yamamoto

Inventor： Eisuke Sasaoka ,  Yoshinori Yamamoto

IPC: G02B6/02

CPC classification number: G02B6/02 ,  C03B37/01248 ,  C03C3/06 ,  C03C13/04 ,  G02B6/02004 ,  G02B6/02223 ,  G02B6/02242 ,  G02B6/02266 ,  G02B6/02285 ,  G02B6/26

Abstract: The present invention provides an optical fiber enabling signal transmission in a wider band, which is applicable to optical transmission not only in the 1.3 μm wavelength band but also in the 1.55 μm wavelength band, as a transmission medium of a WDM optical communication system capable of transmitting signal light of multiple channels. The optical fiber is comprised of silica glass and has a core region along a predetermined axis and a cladding region provided on the outer periphery of the core region. The optical fiber comprising such a structure has, as the following typical optical characteristics, a cable cutoff wavelength of 1260 nm or less, a transmission loss of 0.32 dB/km or less at the wavelength of 1310 nm, and an OH-related loss increase of 0.3 dB/km or less at the wavelength of 1380 nm.

Abstract translation: 本发明提供一种能够在更宽的频带中进行信号传输的光纤，其可以应用于不仅在1.3μm波长带中，而且在1.55μm波长带中的光传输，作为WDM光通信系统的传输介质，能够 传输多个信道的信号灯。 光纤由石英玻璃构成，具有预定轴的芯部区域和设置在芯部区域的外周的包层区域。 包含这种结构的光纤具有以下典型的光学特性：电缆截止波长为1260nm或更小，波长1310nm处的传输损耗为0.32dB / km或更小，OH相关损耗增加 在1380nm的波长下为0.3dB / km以下。

公开(公告)号：US06952309B1

公开(公告)日：2005-10-04

申请号：US09667576

申请日：2000-09-22

Applicant: Tetsufumi Tsuzaki ,  Masayuki Nishimura ,  Masayuki Shigematsu ,  Hitoshi Hatayama ,  Eisuke Sasaoka

Inventor： Tetsufumi Tsuzaki ,  Masayuki Nishimura ,  Masayuki Shigematsu ,  Hitoshi Hatayama ,  Eisuke Sasaoka

IPC: G02F1/01 ,  G02F1/313 ,  H01S3/00 ,  H01S3/067 ,  H01S3/10 ,  H01S3/13

CPC classification number: H01S3/06758 ,  H01S3/06754 ,  H01S3/10007 ,  H01S3/10023 ,  H01S3/1301 ,  H01S2301/04 ,  H04B10/2941 ,  H04B10/2942 ,  H04B10/296

Abstract: A optical filter has a loss spectrum whose gradient dL/dλ of a loss L (dB) with respect to the wavelength λ (nm) is variable in the wavelength band of multiplexed signal light. A control circuit detects each power of signal light components demultiplexed by an optical coupler and controls the power of optical pumping light to be supplied to an optical amplification section from an optical pumping light sources such that the power of output signal light has a predetermined target value. The control circuit also controls the gradient dL/dλ of the optical filter on the basis of powers of the signal light components.

Abstract translation: 滤光器具有损耗谱，其相对于波长λ（nm）的损耗L（dB）的梯度dL /dlλ在复用信号光的波长带中是可变的。 控制电路检测由光耦合器解复用的信号光分量的每个功率，并且控制从光泵浦光源提供给光放大部分的光泵浦光的功率，使得输出信号光的功率具有预定的目标值 。 控制电路还基于信号光分量的功率来控制滤光器的梯度dL / dl。

公开(公告)号：US06868213B2

公开(公告)日：2005-03-15

申请号：US10121724

申请日：2002-04-15

Applicant: Eisuke Sasaoka ,  Takemi Hasegawa ,  Masashi Onishi ,  Shinji Ishikawa

Inventor： Eisuke Sasaoka ,  Takemi Hasegawa ,  Masashi Onishi ,  Shinji Ishikawa

IPC: G02B6/02 ,  C03B37/15 ,  G02B6/032

CPC classification number: G02B6/02328 ,  C03B37/15 ,  C03B2203/16 ,  G02B6/02361 ,  G02B6/02366 ,  G02B6/02376 ,  G02B6/02385

Abstract: The present invention provides an optical fiber which has a hollow portion extending along the axis and which reduces degradation of the optical characteristics, and a production method thereof. An optical fiber includes a hollow core portion, and a cladding portion which surrounds the hollow core portion. The refractive index of the hollow core portion is lower than that of the cladding portion. The hollow core portion is closed at both ends of the optical fiber so as to form sealed portions. The sealed portions are formed by, for example, heating the optical fiber and softening the cladding portion. This prevents foreign material and the like from entering the hollow core portion. Ferrules of optical connectors are attached to both end faces of the optical fiber.

Abstract translation: 本发明提供一种光纤，该光纤具有沿轴线延伸的中空部分，并且减少了光学特性的劣化及其制造方法。 光纤包括中空芯部分和围绕中空芯部分的包层部分。 中空芯部的折射率低于包层部的折射率。 中空芯部在光纤的两端封闭，形成密封部分。 密封部分通过例如加热光纤并使包层部分软化而形成。 这防止异物等进入中空芯部。 光连接器的套圈连接到光纤的两个端面。

公开(公告)号：US06744954B1

公开(公告)日：2004-06-01

申请号：US09441559

申请日：1999-11-17

Applicant: Shigeru Tanaka ,  Eisuke Sasaoka ,  Itaru Sakabe ,  Takeo Tsurumi ,  Yasushi Ito

Inventor： Shigeru Tanaka ,  Eisuke Sasaoka ,  Itaru Sakabe ,  Takeo Tsurumi ,  Yasushi Ito

IPC: G02B644

CPC classification number: G02B6/4427 ,  G02B6/4433

Abstract: The present invention relates to a wide-band, low-loss, submarine optical cable excellent in productivity, an optical fiber unit employed in the submarine optical cable, and a method of making the optical fiber unit. The optical fiber unit employed in the submarine optical cable comprises a loose structure in which one or more coated optical fibers are accommodated together with a soft resin in a space formed within a plastic support. In particular, one or more compression members are embedded in the plastic support along the space accommodating the coated optical fibers. The compression members closely in contact with the plastic support prevents the shrinkage of the plastic support from occurring due to temperature changes before forming a cable utilizing the optical fiber unit. Preventing the shrinkage of the plastic support from occurring before forming the cable suppresses the increase in surplus length ratio of the accommodated coated optical fibers, thereby effectively restraining the transmission loss of the submarine optical cable from increasing due to the increase in surplus length ratio.

Abstract translation: 本发明涉及生产率优良的宽带，低损耗海底光缆，在海底光缆中使用的光纤单元以及制造光纤单元的方法。 在海底光缆中使用的光纤单元包括松散结构，其中一个或多个涂覆的光纤与柔性树脂一起容纳在形成在塑料支撑体内的空间中。 特别地，一个或多个压缩构件沿着容纳涂覆光纤的空间嵌入在塑料支撑件中。 紧密地与塑料支撑件接触的压缩构件防止在形成利用光纤单元的电缆之前由于温度变化而发生塑料支撑件的收缩。 防止在形成电缆之前发生塑料支撑件的收缩，抑制了被容纳的被覆光纤的多余长度比的增加，从而有效地抑制了由于冗余长度比的增加导致的海底光缆的传输损耗的增加。

公开(公告)号：US06724525B2

公开(公告)日：2004-04-20

申请号：US09788659

申请日：2001-02-21

Applicant: Toshiaki Okuno ,  Eisuke Sasaoka ,  Masayuki Nishimura ,  Shigeru Tanaka

Inventor： Toshiaki Okuno ,  Eisuke Sasaoka ,  Masayuki Nishimura ,  Shigeru Tanaka

IPC: H01S300

CPC classification number: H01S3/302 ,  H01S3/0014 ,  H01S3/06754 ,  H01S3/1301 ,  H01S3/1305

Abstract: Disclosed are an optical transmission system and a Raman amplifying control unit that can stabilize the effective loss of a transmission line even if the optical transmission system has a relay station between a transmitting station and a receiving station. The optical transmission system and the Raman amplifying control unit have an introducing means for outputting inspection light and introducing it to the transmission line, a receiving means for receiving the back-scatter from the inspection light, and a control means for inspecting the transmission line and controlling an exciting light supplying means according to the received backscattering light. The introducing means, the receiving means, and the control means are provided together with the exciting light supplying means in a station at the transmitting side or receiving side of a relay section in the optical transmission system.

Abstract translation: 公开了一种光传输系统和拉曼放大控制单元，其即使光传输系统在发射站和接收站之间具有中继站，也可以稳定传输线的有效损耗。 光传输系统和拉曼放大控制单元具有用于输出检查光并将其引入传输线的引入装置，用于从检查光接收反向散射的接收装置和用于检查传输线的控制装置和 根据所接收的反向散射光控制激励光供给装置。 引导装置，接收装置和控制装置与光传输系统中的中继部的发送侧或接收侧的站中的激励光供给装置一起设置。

公开(公告)号：US06711331B2

公开(公告)日：2004-03-23

申请号：US10084667

申请日：2002-02-28

Applicant: Eisuke Sasaoka ,  Shigeru Tanaka

Inventor： Eisuke Sasaoka ,  Shigeru Tanaka

IPC: G02B602

CPC classification number: G02B6/02009 ,  G02B6/02252 ,  G02B6/0228 ,  G02B6/03611 ,  G02B6/03633 ,  G02B6/03666

Abstract: The present invention relates to an optical fiber having, at least, a structure for effectively restraining microbend loss from increasing. This optical fiber is an optical fiber suitable for a dispersion-flattened fiber, a dispersion-compensating fiber, and the like, and insured its single mode in a wavelength band in use. In particular, since the fiber diameter is 140 &mgr;m or more, this optical fiber has a high rigidity, so that the increase in microbend loss is effectively suppressed, whereas the probability of the optical fiber breaking due to bending stresses is practically unproblematic since the fiber diameter is 200 &mgr;m or less. Also, since this optical fiber has a larger mode field diameter, it lowers the optical energy density per unit cross-sectional area, thereby effectively restraining nonlinear optical phenomena from occurring.

Abstract translation: 本发明涉及至少具有有效地抑制微弯损失增加的结构的光纤。 该光纤是适用于分散平坦化光纤，色散补偿光纤等的光纤，并且在使用的波长带中保证其单一模式。 特别是由于纤维直径为140μm以上，所以该光纤具有高刚性，有效地抑制了微弯损耗的增加，而由于弯曲应力而导致的光纤断裂的可能性实际上是不成问题的，因为纤维 直径为200μm以下。 此外，由于该光纤具有较大的模场直径，因此降低了每单位截面积的光能密度，从而有效地抑制非线性光学现象的发生。

公开(公告)号：US06704135B2

公开(公告)日：2004-03-09

申请号：US10007668

申请日：2001-12-10

Applicant: Eisuke Sasaoka ,  Masayuki Nishimura

Inventor： Eisuke Sasaoka ,  Masayuki Nishimura

IPC: H01S300

CPC classification number: H01S3/302 ,  H01S3/1022

Abstract: The present invention relates to an operation mode switching apparatus comprising a structure for making it possible to minimize the waste of energy caused by troubles occurring in optical fiber lines and the like in order to efficiently utilize the energy consumed in an optical transmission system aimed for a long-term operation; a Raman amplifier including the operation mode switching apparatus; and an optical transmission system including the Raman amplifier. If an optical fiber line acting as an optical transmission medium breaks in the optical transmission system, the signal power detected from the optical fiber decreases, whereby it changes to a set value or less or the amount of decrease in signal power per unit time changes by a set value or more. The operation mode switching apparatus comprises a control section for monitoring such a change in signal power, thereby switching the pumping light supply operation from a communication mode to a wait mode for minimizing the waste of pumping energy in response to the occurrence of troubles.

Abstract translation: 本发明涉及一种操作模式切换装置，其包括一种结构，用于使由光纤线路等发生的故障所引起的能量的浪费最小化，从而有效地利用目的在于将光传输系统 长期经营; 包括操作模式切换装置的拉曼放大器; 以及包括拉曼放大器的光传输系统。 如果作为光传输介质的光纤线路在光传输系统中断裂，则从光纤检测到的信号功率减小，由此其变为设定值或更小或每单位时间的信号功率的减小量变化 设定值以上。 操作模式切换装置包括用于监视信号功率变化的控制部分，从而将泵送光供应操作从通信模式切换到等待模式，以便最小化响应于故障发生的泵送能量的浪费。

公开(公告)号：US06556755B2

公开(公告)日：2003-04-29

申请号：US09917744

申请日：2001-07-31

Applicant: Masao Tsukitani ,  Eisuke Sasaoka ,  Shigeru Tanaka

Inventor： Masao Tsukitani ,  Eisuke Sasaoka ,  Shigeru Tanaka

IPC: G02B622

CPC classification number: G02B6/02009 ,  G02B6/02242 ,  G02B6/02261 ,  G02B6/03627 ,  G02B6/03644 ,  G02B6/03677 ,  G02B6/29377

Abstract: The present invention relates to an optical transmission line enabling WDM communications in a wide signal light wavelength band centered at a wavelength of 1.55&mgr;m, in which nonlinear optical phenomena are less likely to occur; and an optical fiber constituting a part of the optical transmission line. The optical fiber has a dispersion D (unit:ps/nm/km) and a dispersion slope S (unit:ps/nm2/km) satisfying the conditions of −69≦D≦−35 and 0.0050×D≦5≦0.0025×D; and, as characteristics with respect to light having a wavelength of 1.55 &mgr;m an effective area of 15 &mgr;m2 or more and a bending loss of 50 dB/m or less when wound at a diameter of 20 mm.

Abstract translation: 本发明涉及一种能够以1.55μm的波长为中心的宽信号光波长带内进行WDM通信的光传输线路，其中不太可能发生非线性光学现象; 以及构成光传输线路的一部分的光纤。 光纤具有满足条件-69 <= D <= - 35和0.0050×D <= 5的条件的色散D（单位：ps / nm / km）和色散斜率S（单位：ps / nm2 / km） = 0.0025xD; 并且作为在波长为1.55μm的光的特性，当直径为20mm时的有效面积为15mum2以上，弯曲损耗为50dB / m以下。

公开(公告)号：US06498874B1

公开(公告)日：2002-12-24

申请号：US09599265

申请日：2000-06-22

Applicant: Takatoshi Kato ,  Eisuke Sasaoka ,  Masayuki Nishimura

Inventor： Takatoshi Kato ,  Eisuke Sasaoka ,  Masayuki Nishimura

IPC: G02B618

CPC classification number: G02B6/02009 ,  G02B6/02242 ,  G02B6/03644 ,  G02B6/03666 ,  G02B6/29377 ,  H04B10/2525

Abstract: This invention relates to an optical transmission line having a structure that reduces dispersion with respect to signal light in a 1.55-&mgr;m band. Each transmission unit includes a dispersion-shifted optical fiber as a transmission medium and a mode removing unit for reducing the optical power of high-order modes excluding a fundamental mode of light signals propagating through the dispersion-shifted optical fiber. The dispersion-shifted optical fiber has an incident terminal on which the light signals are incident and an exit terminal from which the light signals are emitted, and has a cutoff wavelength longer than the wavelength of the light signals at a fiber length of 2 m. The mode removing unit has a structure for reducing the optical power of high-order modes to 1/10 or less, preferably 1/40 or less, of the optical power of the fundamental mode so as to satisfy the single-mode condition in relation to fiber length.

Abstract translation: 本发明涉及一种光传输线路，其具有相对于1.55μm波段中的信号光减少色散的结构。 每个发送单元包括作为传输介质的色散位移光纤和用于降低除通过色散位移光纤传播的基本模式的高阶模式的光功率的模式去除单元。 色散位移光纤具有入射端子，光信号入射到入射端子，出射端子发光，并且具有比光纤长度为2μm的光信号的波长更长的截止波长。 模式去除单元具有将高阶模式的光功率降低到基模的光功率的1/10以下，优选为1/40以下的结构，以满足关于单模状态的单模状态 到纤维长度。

公开(公告)号：US06343175B1

公开(公告)日：2002-01-29

申请号：US09615072

申请日：2000-07-12

Applicant: Eisuke Sasaoka

Inventor： Eisuke Sasaoka

IPC: G02B602

CPC classification number: C03C13/046 ,  C03B37/01446 ,  C03B2201/12 ,  C03B2201/20 ,  C03B2203/22 ,  C03C3/06 ,  C03C13/045 ,  C03C2201/11 ,  C03C2201/12 ,  G02B6/02019 ,  G02B6/02257 ,  G02B6/02266 ,  G02B6/03627

Abstract: This invention relates to an optical fiber having a structure that effectively reduces transmission loss and bending loss. An optical fiber according to this invention is an optical fiber mainly comprised of silica and including a core region and a cladding region covering the core region. The core region is doped with chlorine so as to have a refractive index higher than that of pure silica. The cladding region is doped with fluorine so as to have a refractive index lower than that of pure silica. The optical fiber, in particular, is characterized in that a peak value of a relative refractive index difference of the core region with respect to a refractive index of pure silica is 0.05% or more.

Abstract translation: 本发明涉及具有有效降低传输损耗和弯曲损耗的结构的光纤。 根据本发明的光纤是主要由二氧化硅组成并且包括芯区域和覆盖芯区域的包层区域的光纤。 核心区域用氯掺杂，使其折射率高于纯二氧化硅的折射率。 掺杂氟的包层区域的折射率低于纯二氧化硅的折射率。 特别地，光纤的特征在于，核心区域相对于纯二氧化硅的折射率的相对折射率差的峰值为0.05％以上。