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1. 发明专利

JPH0738182A LIGHT AMPLIFIER 失效
公开(公告)号：JPH0738182A
公开(公告)日：1995-02-07
申请号：JP17771993
申请日：1993-07-19
申请人： MITSUBISHI ELECTRIC CORP , KOKUSAI DENSHIN DENWA CO LTD
发明人： AKIBA SHIGEYUKI , SUZUKI MASATOSHI , GOTO KOJI , ABE HARUO , NORIMATSU NAOKI , MOTOJIMA KUNIAKI , KITAYAMA TADAYOSHI , YAMASHITA JUNICHIRO , NAKAGAWA EIICHI
IPC分类号： G02B27/28 , H01S3/06 , H01S3/07 , H01S3/094 , H01S3/10
摘要： PURPOSE:To prevent the fluctuation of exciting beam power to be inputted to a light amplifier by inserting a light isolator between the exciting beam source and an optical coupler. CONSTITUTION:Optical isolators 13 and 14 are inserted between exciting beam sources 1, 2 and a 3dB coupler 4 so as not to cause injection synchronism. As another method, optical fiber which is much longer than the coherence length of the exciting beam sources 1 and 2 is inserted between the exciting beam sources 1, 2 and the 3dB coupler 4 so as to allow the coherence of the two beams inputted to the 3dB coupler 4 to be sufficiently low even when the injection synchronism has occurred. As the other method, FM modulation can be applied to the exciting beam sources 1 and 2, and the emission spectrum width can be widened to the same width of the injection synchronism or wider so as to prevent injection synchronism. Thus, the gain fluctuation which has occurred by the conventional constitution when rare earth added optical fiber is used is suppressed.

2. 发明专利

JPH05224254A OPTICAL FIBER AMPLIFIER 失效
公开(公告)号：JPH05224254A
公开(公告)日：1993-09-03
申请号：JP2866492
申请日：1992-02-15
申请人： MITSUBISHI ELECTRIC CORP
发明人： NAKAGAWA EIICHI
IPC分类号： G02F1/35 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/094 , H01S3/0941 , H01S3/10 , H04B10/29 , H04B10/293
摘要： PURPOSE:To obtain a low-noise or high-output rare earth element doped optical fiber amplifier according to the purpose of use without extremely increasing or decreasing the load on an exciting light source. CONSTITUTION:Exciting light beams emitted by an exciting light source 2a and an exciting light source 2b are multiplexed by a multiplexer 10 and then made incident on a variable optical branching unit 6, which branches the multiplexed light into two at an optional ratio. The exciting light outputted from a branch output terminal a7b is made incident on a rare earth element doped optical fiber 1 through a multiplexer demultiplexer a3a and the exciting light outputted from a branch output terminal b7c is made incident through a multiplexer demultiplexer b3b. The signal light is amplified in the rare earth element doped optical fiber 1 and passed through the multiplexer demultiplexer b3b and then projected from a signal light output terminal 4b. The ratio of the branch output of the exciting light to the branch output terminal a7b of the variable optical branching unit 6 and the branch output to the branch' output terminal b7c is varied to obtain the low-noise or high-output rare earth element doped optical fiber amplifier.

3. 发明专利

JPH04179175A OPTICAL AMPLIFIER 失效
公开(公告)号：JPH04179175A
公开(公告)日：1992-06-25
申请号：JP30439490
申请日：1990-11-09
申请人： MITSUBISHI ELECTRIC CORP
发明人： ADACHI AKIHIRO , YAMASHITA JUNICHIRO , NAKAGAWA EIICHI
IPC分类号： H01S3/094 , H01S3/06
摘要： PURPOSE:To eliminate the reflecting points from an amplifying optical fiber and to protect an exciting Laser Diode(LD) against damage even if an laser oscillation starts in the amplifying optical fiber by a method wherein a filter is interposed between the exciting LD and the amplifying optical fiber on an optical path to transmit exciting light, attenuating light of wavelengths which falls in with the gain band of the amplifying optical fiber. CONSTITUTION:Exiting light 1480nm in wavelength peak emitted from an exciting LD 12 is converged through a lens 14, made to impinge on a fiber end 13 passing through a filter 20, directed to an amplifying fiber, and made to induce an amplifying action to light whose wavelength belongs to the gain band of the amplifying optical fiber. On the other hand, light whose wavelength falls in with the gain wavelength peak 1535nm of the amplifying optical fiber propagates to an exciting LD module, impinges on the filter 20 as emitted from the fiber end 13, and is attenuated by the filter 20. Therefore, a reflecting point of the exciting LD module, especially the exciting LD 12 having a considerable effect on the reflection can be prevented from serving as a reflecting point. Even if laser oscillation starts in the amplifying optical fiber, as the oscillated laser rays are attenuated by the filter 20, the exciting LD 12 is protected against damage.

4. 发明专利

JPH03145608A LASER DIODE MODULE 失效
公开(公告)号：JPH03145608A
公开(公告)日：1991-06-20
申请号：JP28566389
申请日：1989-11-01
申请人： MITSUBISHI ELECTRIC CORP
发明人： NAKAGAWA EIICHI , YAMASHITA JUNICHIRO , KANEKO SHINICHI , HATTA TATSUO
IPC分类号： G02B6/42 , H01S5/00
摘要： PURPOSE:To maintain original 2nd higher harmonic distortion that an LD element generates even in an easy connection state using a connector by providing a coating layer of a material which has a larger refractive index than a clad layer and has absorption characteristics in the oscillation wavelength range of the LD element. CONSTITUTION:The optical fiber formed by coating the clad layer 7 with the material which has the larger refractive index than the clad layer 7 and has absorption characteristics in the oscillation wavelength range of the laser diode element (LD) 1 is used. In an LD module 24 like this, light which is emitted by the LD element 1, made incident on the clad layer 7 of an optical fiber, and further made incident on the coating layer 23 is absorbed in the clad layer 23 and never re-incident on the clad layer 7, so the propagation loss of light propagated in the clad layer 7 of the optical fiber increases and a connector connection reduces the quantity of light incident on the core layer 6 of the optical fiber of a photodiode module to an extent where the light can be ignored as compared with the level of the 2nd higher harmonic component of light propagated in an original path. Consequently, the 2nd higher harmonic distortion generated by the LD element 1 can be maintained.

5. 发明专利

JPH01192187A LIGHT EMITTING SEMICONDUCTOR DEVICE 失效
公开(公告)号：JPH01192187A
公开(公告)日：1989-08-02
申请号：JP1808188
申请日：1988-01-28
申请人： MITSUBISHI ELECTRIC CORP
发明人： NAKAGAWA EIICHI , YAMASHITA JUNICHIRO
IPC分类号： H01S5/00
摘要： PURPOSE:To decrease the reflection of a signal toward an external line by a method wherein an LD housed in a hermetically sealed case and an input terminal of an LD drive signal are connected with each other through a micro strip line, where either a characteristic impedance or an electrical length of the strip line or both are specified in value. CONSTITUTION:An LD 1 is electrically connected with a lead wire (A) 7a and a substrate 2, and also connected with an input terminals (A) 6a and (B) 6b through the intermediary of a micro strip line 13. The characteristic impedance Z0 of the micro strip line 13 can be easily preset by the width of a metallic pattern on the top face, the thickness of the substrate 2, and the dielectric constant of the substrate 2. The reflection of a signal toward the external line 11 can be made smaller than that of a conventional device without fail by employing the micro strip line 13 whose characteristic impedance Z0 is preset between that Z0' of the external line 11 and that ZLD (f) of the LD 1.

6. 发明专利

JPS63213807A OPTICAL COUPLING DEVICE 失效
公开(公告)号：JPS63213807A
公开(公告)日：1988-09-06
申请号：JP4821587
申请日：1987-03-03
申请人： MITSUBISHI ELECTRIC CORP
发明人： NAKAGAWA EIICHI , YAMASHITA JUNICHIRO
IPC分类号： G02B6/30 , G02B6/42
摘要： PURPOSE:To improve the coupling efficiency between a light emitting semiconductor element and an end-rounded fiber by providing a projection on a carrier- side joint surface or/and a holder-side joint surface and allowing this projection on one joint surface to bite into the other. CONSTITUTION:An end-rounded fiber 3 is put in a V-shaped groove on a holder 4 and the carrier-side joint surface and the holder-side joint surface are joined, and in this state, a retaining plate 7 is set after the distance between a light emitting semiconductor element LD 1 and the end-rounded fiber 3 is adjusted. The carrier-side joint surface and the holder-side joint surface are kept parallel with each other, and a carrier 2 and the holder 4 are so moved and positioned that the coupling efficiency between the LD 1 and the end-rounded fiber 3 is maximum. The carrier-side joint surface and the holder-side joint surface are closely brought into contact with each other to allow a projection on the carrier- side joint surface to bite into the holder-side joint surface. In this state, a weld position 5 is welded. Relative positions of the carrier and the holder are not changed at the time of welding because the projection bites into the other joint surface, and a high degree of coupling is kept between the LD and the end- rounded fiber.

7. 发明专利

JPS62169110A OPTICAL COUPLER 失效
公开(公告)号：JPS62169110A
公开(公告)日：1987-07-25
申请号：JP1053486
申请日：1986-01-21
申请人： MITSUBISHI ELECTRIC CORP
发明人： NAKAGAWA EIICHI , YAMASHITA JUNICHIRO , MIYAKE YOSHIO
IPC分类号： G02B6/00 , G02B6/42
摘要： PURPOSE:To excellently maintain the optical coupling efficiency between an optical fiber and light emitting element even in a thermal atmosphere, by fixing a capillary which holds the light receiving side of the optical fiber, which is inserted into the capillary freely slidably inside an airtight container. CONSTITUTION:A ceramic-made capillary 11 provided with an inserting hole 12, which holds the light receiving side section of an optical fiber 4 inserted into the hole 12 freely slidably is housed in a package 1 and fixed to a chip carrier 13 by soldering 5. As a whole, they are formed in a cylindrical shape. Moreover, the capillary 11is coated with a metallic thin film so as to improve the degree of joining with the solder 5. The optical fiber 4 becomes movable in the direction of the optical axis and the fiber holding surface becomes larger by the quantity of the clearance formed between the optical fiber 4 and inner surface of the inserting hole 12. Therefore, the stress to the fiber holding surface which acts depending upon the difference in thermal expansion can be minimized as much as possible and the positional deviation of the optical fiber 4 in the direction normal to the optical axis can be reduced.

8. 发明专利

JPS61138904A Optical coupling device 失效
标题翻译：光耦合器件
公开(公告)号：JPS61138904A
公开(公告)日：1986-06-26
申请号：JP26082584
申请日：1984-12-12
申请人： Mitsubishi Electric Corp
发明人： NAKAGAWA EIICHI , YAMASHITA JUNICHIRO , MIYAKE YOSHIO , TAKEI TOSHIO
IPC分类号： G02B6/32 , G02B6/42
摘要： PURPOSE: To make stably incident the light radiated from a light emitting element with high efficiency on an optical fiber by using a cap for airtight sealing fixed airtightly with a specifically composed high refractive index lens to the spot facing of the output hole of a case.
CONSTITUTION: The output hole 3 is formed at the center of the base wall of a case 2 made into a bottomed cylindrical shape and the spot facing 4 concentrical with the hole 3 is formed to the outside surface of the base wall. The high refractive index lens 6 of either a semispherical or planoconvex shape consisting of any among GaAs, CdTe, ZnSe, KRS5, As
2 S
3 glass, ZnS and AgCl is disposed by matching the plane end of said lens with the base of the spot facing 4. The outside periphery of the lens 6 and the inside wall of the spot facing 4 are airtightly sealed by means of a brazing material, adhesive agent or low melting glass. The light emitting element 8 is then sealed into the case with gaseous nitrogen by using the cap 1 for airtight sealing obtd. in the above- mentioned manner. The light 12 radiated from element 8 is made incident by a lens 6 with high efficiency on an optical fiber 13.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：通过使用用特定组合的高折射率透镜气密密封的帽，将其从发光元件高效率地照射到光纤上，使其稳定地入射到壳体的输出孔的面。结构：输出孔3形成在底部圆筒形状的壳体2的底壁的中心，并且与孔3同心的点形成在底壁的外表面上。通过将所述透镜的平面端与面向4的光斑的底部相匹配来设置由GaAs，CdTe，ZnSe，KRS5，As2S3玻璃，ZnS和AgCl中的任何一种组成的半球形或平凸形状的高折射率透镜6。透镜6的外周和点对面4的内壁通过钎焊材料，粘合剂或低熔点玻璃气密密封。然后通过使用用于气密密封的盖1将发光元件8密封在具有气态氮的壳体中。以上述方式。从元件8辐射的光12在光纤13上由透镜6高效地入射。

9. 发明专利

JP2003032155A Feeder changeover circuit and underwater branching device 有权
标题翻译：进料器更换电路和水下分流装置
公开(公告)号：JP2003032155A
公开(公告)日：2003-01-31
申请号：JP2001218554
申请日：2001-07-18
申请人： Kddi Submarine Cable Systems Inc , Mitsubishi Electric Corp , ケイディディアイ海底ケーブルシステム株式会社 , 三菱電機株式会社
发明人： KUMAYASU SATOSHI , NAKAGAWA EIICHI , ASAKAWA KENICHI , SATO KAZUNORI
IPC分类号： H04B3/44
CPC分类号： H04B3/44 , Y10T307/74 , Y10T307/826 , Y10T307/865
摘要： PROBLEM TO BE SOLVED: To provide a feeder changeover circuit that can surely select a feeder without decreasing a current flowing through a relay after the operation of the relay and avoiding repetition of the relay for its operating and inoperative states. SOLUTION: The feeder changeover circuit is provided with the relay K1 connected between feeders 1a and 1b and operable depending on the feeding current, a contact k1-2 closed when the relay K1 is not in operation and opens when the relay K1 is in operation, a resistor R1 for configuring a series circuit with the contact k1-2 and connected in parallel with the series circuit, and the resistance of the relay K1 and the resistance of the resistor R1 satisfy a prescribed condition.
摘要翻译：要解决的问题：提供一种在继电器操作之后能够可靠地选择馈线而不减少流过继电器的电流的馈线切换电路，并避免继电器对其工作和不工作状态的重复。解决方案：馈线切换电路设有连接在馈线1a和1b之间的继电器K1，并根据馈电电流进行操作;当继电器K1不工作时，触点k1-2闭合，继电器K1运行时断开; 用于与触点k1-2串联电路并与串联电路并联连接的电阻器R1，并且继电器K1的电阻和电阻器R1的电阻满足规定条件。

10. 发明专利

JPH0998137A BIDIRECTIONAL OPTICAL COMMUNICATION METHOD 失效
公开(公告)号：JPH0998137A
公开(公告)日：1997-04-08
申请号：JP25633995
申请日：1995-10-03
申请人： MITSUBISHI ELECTRIC CORP
发明人： NAKAGAWA EIICHI , MIZOGUCHI TAKAHIRO , NAKAOKA MASAKI
IPC分类号： H04N7/14 , H04B10/00 , H04B10/516 , H04B10/524 , H04B10/556 , H04B10/61 , H04J14/00 , H04J14/04 , H04J14/06 , H04N7/22 , H04N21/647 , H04B10/24 , H04B10/04 , H04B10/06 , H04B10/142 , H04B10/152
摘要： PROBLEM TO BE SOLVED: To unnecessitate a MODEM by performing communication among spots more than two by bidirectionally transmitting an optical signal modulated in a 1st modulation form and an optical signal modulated in a 2nd modulation form through the same transmission line optical fiber. SOLUTION: A signal C is converted to an analog modulated optical signal of an optical wavelength λ1 at optical transmission equipment 1a and inputted later to a photocoupler 1c connected to the equipment 1a. This signal is inputted through a transmission line optical fiber 100 to a photocoupler 2c at a spot 2 and demodulated to the analog modulated signal C at optical reception equipment 2a. On the other hand, a signal D is made a digitally modulated signal of the optical wavelength λ1 by optical transmission equipment 2a at the spot 2 and inputted to the photocoupler 2c. This signal is inputted through the fiber 100 to the photocoupler 1c at a spot 1. At one port on the output side of the coupler 1c, the optical signal connected to the optical reception equipment 1b and having intensity-distribution is transmitted to the equipment 1b and demodulated to the digitally modulated signal D.

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