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1. 发明专利

JP2002055239A PHOTONIC CRYSTAL FIBER AND ITS MANUFACTURING METHOD 失效
公开(公告)号：JP2002055239A
公开(公告)日：2002-02-20
申请号：JP2000240728
申请日：2000-08-09
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： YOSHIDA MINORU , TANAKA MASATOSHI , FUJITA MORIYUKI , OMAE TOSHIKAZU , IMAMURA KAZUO , NAKAZAWA MASATAKA , KUBOTA HIROKAZU , KAWANISHI SATOKI
IPC分类号： G02B6/00 , G02F1/35 , G02F1/355 , G02F1/365 , H01S3/06 , H01S3/10
摘要： PROBLEM TO BE SOLVED: To provide a filter realizing an optical fiber amplifier having very high efficiency and excellent in a noise characteristic and realizing an optical fiber laser. SOLUTION: In a photonic crystal fiber 1 having a multi-hole part 12 in which a large number of small holes 12a extending in the central axis direction of the fiber are arranged with highest density and a core pat 11 which is formed in a solid shape at the center of the multi-hole part 12, a functional material (for example, Er) which improves a light amplifying action or a nonlinear optical effect is doped in the core part 11.

2. 发明专利

JPH10339822A OPTICAL FIBER FOR AMPLIFICATION 失效
公开(公告)号：JPH10339822A
公开(公告)日：1998-12-22
申请号：JP14882897
申请日：1997-06-06
申请人： MITSUBISHI CABLE IND LTD , MITSUBISHI ELECTRIC CORP
发明人： YOSHIDA MINORU , OMAE TOSHIKAZU , SASAKI TOSHIHISA , HIRANO YOSHIHITO , SHOJI YASUHIRO
IPC分类号： G02B6/036 , G02B6/26 , H01S3/06 , H01S3/10 , G02B6/22
摘要： PROBLEM TO BE SOLVED: To effectively absorb and attenuate unnecessary light such as ASE leaking form a first core to a second core and to increase the amplification efficiency for signal light by doping a second core with a dopant which absorbs signal light without causing interference with excitation light. SOLUTION: The first core 2 essentially consists of quartz and its outer diameter is determined to generate a single mode for signal light. The first core 2 is doped with rare earth elements such as Nd. As for the clad 6, a polymer resin such as urethane acrylate and polymerthnylethacrysalte is used for protection and enclosing of light. The second core 4 consists of an nndoped region 4a in contact with the first core 2 and a doped region 4b around the region 4a. The both regions essentially consist of quartz, and the doped region 4b is doped with a dopant which absorbs signal light without causing interference with excitation light.

3. 发明专利

JPH09227149A PRODUCTION OF TAPERED OPTICAL FIBER 失效
公开(公告)号：JPH09227149A
公开(公告)日：1997-09-02
申请号：JP4087796
申请日：1996-02-28
申请人： MITSUBISHI CABLE IND LTD
发明人： SASAKI TOSHIHISA , SHIMOYAMA YOSHIO , TANAKA MASATOSHI , OMAE TOSHIKAZU
IPC分类号： G02B6/00 , C03B37/025 , C03B37/027 , C03B37/12 , C03B37/16 , G02B6/02 , G02B6/10
摘要： PROBLEM TO BE SOLVED: To surely and easily produce a tapered optical fiber of the 2nd form having a core diameter and a clad diameter varying in longitudinal direction in tapered form while keeping a constant C/C ratio. SOLUTION: A drawing preform having a core diameter and a clad diameter uniform in longitudinal direction is drawn by delivering the preform at a prescribed constant delivery speed V0 , increasing the drawing speed (linear speed) S from the 1st preset level S1 to the 2nd preset level S2 , passing the preform through a transition zone C2 keeping the speed S2 and decreasing the speed from S2 to S1 . The preform is passed through a transition zone C1 keeping the speed S1 , the speed is increased to S2 and the operations are repeated. The increase or decrease of the speed is carried out by gradually and continuously varying the drawing speed in a tapering zone T having a length corresponding to the necessary length of the tapered optical fiber. The tapering work may be performed by increasing or decreasing the transfer speed of the preform while keeping the drawing speed at a constant level. The speed may be increased from zero or decreased from a prescribed speed to zero. Both end positions of the tapered part Ft is automatically marked simultaneously with the drawing work.

4. 发明专利

JPH0749429A MANUFACTURE OF GLASS WAVEGUIDE 失效
公开(公告)号：JPH0749429A
公开(公告)日：1995-02-21
申请号：JP19364593
申请日：1993-08-04
申请人： MITSUBISHI CABLE IND LTD
发明人： ITO HIDEAKI , KINOSHITA TAKAAKI , IKUNISHI SHIYOUGO , ONO KOICHI , OMAE TOSHIKAZU
IPC分类号： C03C17/02 , G02B6/13
摘要： PURPOSE:To prevent the cracking and disconnection caused by the adhesion of a foreign material by forming a core glass film on a base, and then forming a silicone film on the core glass film within the same pressure-reduced reaction vessel. CONSTITUTION:A quartz base 3 is set in a reaction vessel 1, mass flow rate controllers 6a-6c are controlled to supply SiCl34 gas, GeCl4 gas and O2 from starting gas supplying sources 7a-7c. A high frequency voltage is applied to an induction coil 4 by a high frequency power source 5 to generate a plasma in the reaction vessel 1, and the gas is discharge-decomposed to accumulate a core glass layer on the quartz base 3 by reduced pressure plasma CVD method. Thereafter, the mass flow rate controllers 6a-6c are controlled to supply only SiCl4 gas into the reaction vessel 1. Then, SiCl4 is discharge-decomposed into Si and 2Cl2, and a silicone film is accumulated on the core glass film. Since it is not required to break the vacuum in the reaction vessel 1, therefore, the adhesion of a foreign material resulted from the breakage of the vacuum can be prevented.

5. 发明专利

JPH0749422A FIXED TYPE ATTENUATOR 失效
公开(公告)号：JPH0749422A
公开(公告)日：1995-02-21
申请号：JP19725993
申请日：1993-08-09
申请人： MITSUBISHI CABLE IND LTD
发明人： YOSHIDA MINORU , OMAE TOSHIKAZU
IPC分类号： G02B6/00 , G02B6/028 , G02B6/255 , G02B6/18
摘要： PURPOSE:To almost eliminate the influence of return light due to reflection, and also to restrain as tar as possible the occurrence of a clad propagation mode in which the light attenuated in a light-attenuating part is propagated to a clad, by coating the outer circumference of the clad with a light absorber. CONSTITUTION:In an attenuator element 19, a light-attenuating part 22 is formed in the vicinity including the butted end surface 21 of a pair of optical fibers 201, 202 by buttedly fusing the pair of optical fibers 201, 202 in such a state that the optical axes of the cores 2011, 2021 thereof have been dislocated by a prescribed amount, and also light absorbers 241, 242 consisting of a vapour deposition film of carbon or the like are coated on the outer circumference of the clads 2012, 2022 of the respective optical fibers 201, 202. In the curved part of the optical fiber 201, the light radiated in the clad 202. is dispersed and would directly propagate in the clad 2022 of the optical fiber 202. However, it is quickly absorbed and attenuated by the light absorber 242 that has been formed on the outer circumference of the clad 2022, so that the clad propagation mode can be restrained.

6. 发明专利

JPH0748150A METHOD FOR APPLYING CARBON TO OPTICAL GLASS 失效
公开(公告)号：JPH0748150A
公开(公告)日：1995-02-21
申请号：JP19228193
申请日：1993-08-03
申请人： MITSUBISHI CABLE IND LTD
发明人： SASAKI TOSHIHISA , TAKEDA TETSUYA , NAKAGAWA TOSHIO , OSE SHUNICHIRO , KAIDE TAMOTSU , OMAE TOSHIKAZU
IPC分类号： C03C25/42 , C03C25/10 , G02B6/24 , G02B6/44 , C03C25/02
摘要： PURPOSE:To make it possible to locally form carbon-coated film on the surface of an optical fiber using an extremely simple apparatus. CONSTITUTION:A heating element 3 formed in part of the circumference of a quartz pipe 2 is heated to form high-temperature heat atmosphere in the interior of the quartz pipe 2 and simultaneously, a raw material gas for carbon coating is introduced into the interior of this quartz pipe 2 and this raw material gas is decomposed by the heat atmosphere to locally form the carbon film on the surface of the optical fiber inserted along the axial direction of the quartz pipe 2.

7. 发明专利

JPH04175731A AMPLIFICATION OPTICAL FIBER 失效
公开(公告)号：JPH04175731A
公开(公告)日：1992-06-23
申请号：JP30559190
申请日：1990-11-08
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： YOSHIDA MINORU , ITO HIDEAKI , OIZUMI SEIRO , OMAE TOSHIKAZU , MORISAWA MASAAKI , TANAKA HIROYUKI , NAKAZAWA MASATAKA , KIMURA YASURO
IPC分类号： G02B6/00 , G02B6/02 , G02F1/35 , H01S3/06 , H01S3/07 , H01S3/17
摘要： PURPOSE:To suppress the micro-coagulation of Er ions, increase and unify its dispersibility, and obtain an amplification optical fiber with higher amplification gain by co-doping Er and La to the inside of a core or the outer periphery of the core. CONSTITUTION:Er and La are co-doped to the inside 1 of a core of a quartz optical fiber or the outer periphery of the core to constitute an amplification optical fiber (a). When La is co-doped, the dispersibility of Er ions can be increased for the doping concentration of the Er ions, and the amplification action on the signal light based on the induced emission by the excitation light can be long continued along the longitudinal direction of the amplification optical fiber (a). The amplification gain of the amplification optical fiber (a) can be further increased beyond the present limit.

8. 发明专利

JPH03127885A LIGHT AMPLIFIER 失效
公开(公告)号：JPH03127885A
公开(公告)日：1991-05-30
申请号：JP26724689
申请日：1989-10-13
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： NAKAZAWA MASATAKA , KIMURA YASURO , TANAKA HIROYUKI , OMAE TOSHIKAZU , YOSHIDA MINORU , MORISAWA MASAAKI
IPC分类号： G02B6/02 , G02F1/35 , H01S3/06 , H01S3/067 , H01S3/094 , H01S3/10 , H01S3/17
摘要： PURPOSE:To enable signal light to be sufficiently amplified to the power required for long distance transmission by a device of compact size and low cost by a method wherein a normal input exciting means or inverse input exciting means inputting exciting means in the transmitting direction are arranged respectively on the input side or the output side of an amplifying optical fiber. CONSTITUTION:A pumping light beam is introduced along the transmitting direction of signal light from a normal input pumping means 4 provided on the input side of an amplifying optical fiber 2. Bisides, another pumping light beam is introduced along the reverse direction to the transmitting direction of the signal light from a reverse input exciting means 12 provided on the output side of the amplifying optical fiber 2. At this time, the same pumping effect is given on the amplifying optical fiber 2 regardless of the forward or reverse input direction of the pumping light beams to the amplifying optical fiber 2. Accordingly, the amplifying optical fiber 2 is excited by respective pumping light beams so that the signal light may be amplified dually by the induced emission effect corresponding to the respective pumping light. Thus, the title photoamplifier of compact size and low cort is capable of sufficiently amplifying the signal light to the power required for a long distance transmission.

9. 发明专利

JPH03113404A OPTICAL FIBER 失效
公开(公告)号：JPH03113404A
公开(公告)日：1991-05-14
申请号：JP25290789
申请日：1989-09-28
申请人： MITSUBISHI CABLE IND LTD
发明人： ROKUNOHE MITSURU , TANAKA HIROYUKI , OMAE TOSHIKAZU
IPC分类号： G02B6/44 , C03C13/04 , C03C25/42
摘要： PURPOSE:To prevent the degradation in transmission characteristics by incorporating titania into the fiber in the state in which the content ratio thereof increases toward the outer side. CONSTITUTION:Raw materials for doping, such as SiCl4 and TiCl4, are introduced into a burner 41 for a core and a porous glass body 11 for the core consisting of SiO2 contg. a refractive index control agent, such as GeO2, is formed. The SiCl4 is then introduced into a burner 42 for a clad and a porous glass body 21 for a clad layer consisting of the SiO2 is formed on the outer side of the porous glass body 11 for the core. The SiCl4 and TiCl4 are then introduced into burners 43 to 45 for reinforcing coating layers and the porous glass bodies 31 to 33 for the reinforcing coating layers consisting of the SiO2 contg. the TiO2 are successively formed on the outer side of the porous glass body 21 for the clad layer. The porous glass bodies 31 to 33 for the reinforcing coating layers formed by successively increasing the supply rates of the TiCl4 are so formed that the content of the TiO2 therein is higher while approaching the outer side. Thus, the transmission characteristics are well maintained and no hindrances are exerted on transmission signal.

10. 发明专利

JPH03109229A PRODUCTION OF OPTICAL FIBER PREFORM 失效
公开(公告)号：JPH03109229A
公开(公告)日：1991-05-09
申请号：JP24720689
申请日：1989-09-21
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： OMAE TOSHIKAZU , TANAKA HIROYUKI , YOSHIDA MINORU , MORISAWA MASAAKI , NAKAZAWA MASATAKA , KIMURA YASURO
IPC分类号： G02B6/00 , C03B8/00 , C03B37/014
摘要： PURPOSE:To reduce the OH groups remaining in a core and to improve the adsorption loss characteristic by depositing a clad soot on a porous core soot by VAD method through the rare-earth element treatment by an alcoholic soln. and then sintering the deposited soot. CONSTITUTION:The porous core soot prepared by VAD method is impregnated with an alcoholic soln. contg. rare-earth elements. The impregnated soot is then dried to vaporize alcohol, and then a clad soot is directly deposited on the core soot. The material is dehydrated and then sintered to vitrify the core soot and clad soot, and the desired optical fiber preform is obtained. Since the clad soot is directly deposited on the core soot and both soots are dehydrated, the soots are sufficiently dehydrated. Accordingly, the OH groups remaining in the core are drastically reduced, and an optical fiber doped with the rare- earth elements and with the adsorption loss characteristic improved is obtained.

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