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1. 发明专利

JP2003255153A SINGLE-MODE OPTICAL FIBER 审中-公开
公开(公告)号：JP2003255153A
公开(公告)日：2003-09-10
申请号：JP2002061224
申请日：2002-03-06
申请人： NIPPON TELEGRAPH & TELEPHONE , MITSUBISHI CABLE IND LTD
发明人： KUBOTA HIROKAZU , KAWANISHI SATOKI , SUZUKI KAZUNOBU , KOYANAGI SHIGEKI , TANAKA MASATOSHI , FUJITA MORIYUKI
IPC分类号： G02B6/00 , G02B6/032 , G02B6/20
摘要： PROBLEM TO BE SOLVED: To provide a single-mode optical fiber in photonic crystal structure which is easy to manufacture and has the high degree of freedom of design of a dispersion characteristic and has a large core diameter. SOLUTION: The geometric diameter of a core part is made larger than twice as large as the mean interval between columnar holes by arranging two kinds of columnar holes which extend in the extending direction of an optical fiber and have different internal diameters in a clad part discretely at fixed intervals. Further, columnar holes which are arranged at an equal distance from the geometric center of the core part among the columnar holes arranged in the clad part are made equal in diameter. Those columnar holes are filled with a medium which is smaller in refractive index to light of wavelength guided in a vacuum or the fiber than the substance forming the fiber. Furthermore, the core part has a plurality of columnar holes extending in the extending direction of the fiber. COPYRIGHT: (C)2003,JPO

2. 发明专利

JP2003221259A METHOD OF MANUFACTURING OPTICAL FIBER 审中-公开
公开(公告)号：JP2003221259A
公开(公告)日：2003-08-05
申请号：JP2002019527
申请日：2002-01-29
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： TANAKA MASATOSHI , YAMATORI SHINYA , KAWANISHI SATOKI , SUZUKI KAZUNOBU , KUBOTA HIROKAZU
IPC分类号： G02B6/00 , C03C25/10
摘要： PROBLEM TO BE SOLVED: To provide a method of manufacturing an optical fiber capable of easily and simply being formed with a uniform thickness of coating in a circular direction without controlling the thickness of coating during heat drawing the optical fiber having a plurality of fine through holes extending in an axial direction of the fiber. SOLUTION: A optical fiber preform 1 is formed by jointing while aligning an axis of a 1st preform 31 having a plurality of through holes extending along the axial direction with an axis of a 2nd solid preform of almost same diameter. The optical fiber 2 is manufactured by heating and drawing the fiber preform 1 from a side of the 2nd preform 32. The optical fiber 2 is coated with resin by a die, wherein the thickness of coating is measured and the position of the die is adjusted so as to obtain the nearly uniform thickness of coating in the circular direction. If the thickness of coating is made nearly uniform while heat drawing the 2nd preform 32, the optical fiber 2 drawn from the 1st preform 31 is coated with nearly uniform thickness without measurement or adjustment for the 1st preform 31 part. COPYRIGHT: (C)2003,JPO

3. 发明专利

JP2003221254A METHOD FOR MANUFACTURING POLARIZATION MAINTAINING PHOTONIC CRYSTAL FIBER 审中-公开
公开(公告)号：JP2003221254A
公开(公告)日：2003-08-05
申请号：JP2002019316
申请日：2002-01-29
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： TANAKA MASATOSHI , YAMATORI SHINYA , FUJITA MORIYUKI , KAWANISHI SATOKI , SUZUKI KAZUNOBU , KUBOTA HIROKAZU
IPC分类号： G02B6/00 , C03B37/012 , C03B37/02 , G02B6/02 , G02B6/024 , G02B6/17
摘要： PROBLEM TO BE SOLVED: To provide a method for easily manufacturing a polarization maintaining photonic crystal fiber having fine holes with an oval-shaped outer cross section. SOLUTION: In manufacturing a polarization maintaining photonic crystal fiber where the outer cross section of each fiber inside of each fine hole of the clad is oval-shaped, a preform 4 having a plurality of round holes formed to meet the hole pattern of the cross section of the fiber and being formed to have an oval-shaped outer cross section is prepared and drawn to a fiber with a fine diameter. COPYRIGHT: (C)2003,JPO

4. 发明专利

JP2002333531A LARGE DIAMETER FIBER 失效
公开(公告)号：JP2002333531A
公开(公告)日：2002-11-22
申请号：JP2001135964
申请日：2001-05-07
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： YAMAMOTO TETSUYA , TANAKA MASATOSHI , FUJITA MORIYUKI , NAKAZAWA MASATAKA , KUBOTA HIROKAZU , KAWANISHI SATOKI
IPC分类号： G02B6/00 , C03B37/012 , G02B6/02
摘要： PROBLEM TO BE SOLVED: To provide a large diameter fiber capable of obtaining a numerical aperture(NA) larger than that of a conventional and having high latitude for designing. SOLUTION: The large diameter fiber 10 to be used to transmit energy and/or images as light is composed of a photonic crystal fiber having a packed core 11 forming the fiber center and a clad 12 formed to cover the core 11 and having a photonic crystal structure formed in the radial direction of the fiber.

5. 发明专利

JP2002097034A METHOD FOR MANUFACTURING PHOTONIC CRYSTAL FIBER 失效
公开(公告)号：JP2002097034A
公开(公告)日：2002-04-02
申请号：JP2000287528
申请日：2000-09-21
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： TANAKA MASATOSHI , YOSHIDA MINORU , YAMAMOTO TETSUYA , KOYANAGI SHIGEKI , NAKAZAWA MASATAKA , KUBOTA HIROKAZU , KAWANISHI SATOKI
IPC分类号： G02B6/032 , C03B37/012 , C03B37/027 , G02B6/00 , G02B6/20
摘要： PROBLEM TO BE SOLVED: To provide an easy method for manufacturing photonic crystal fiber. SOLUTION: In a method for manufacturing photonic crystal fiber which possesses a core part extending in a longer direction of a centre of fiber and is formed in the filled or hollow parts and a porous part which is formed so as to surround the core part and possesses many minute pores extending along the core part, as many capillaries 2, 2... are filled up into a cylindrical support tube 1 as to run parallel with a central axis of the tube 1, a core material 3 which becomes a core part of an inner substance is arranged at a centre tube part of the tube 1 to make a preform 4 which is thinned by a processing of drawing a line.

6. 发明专利

JPH08146472A OPTICAL SOLITON COMMUNICATION METHOD 失效
公开(公告)号：JPH08146472A
公开(公告)日：1996-06-07
申请号：JP28097994
申请日：1994-11-15
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NAKAZAWA MASATAKA , KUBOTA HIROKAZU
IPC分类号： G02B6/00 , G02F1/35 , H04B10/2507 , H04B10/2513 , H04B10/255 , H04B10/02 , H04B10/18
摘要： PURPOSE: To provide a cost effective and practicable soliton communication system. CONSTITUTION: Optical fibers F1, F2, F3...Fn which respectively have lengths Z1, Z2, Z3...Zn and dispersion values D1, D2, D3...Dn and are connected serially are so selected that the average values by the distance of the values of their group velocity dispersion attain abnormal dispersion in order to enable soliton communication. Namely, the free selection of the lengths Z1 to Zn and dispersion values D1 to Dn of the respective optical fibers F1 to Fn is possible within the range satisfying these conditions. The yield in the production of the optical fibers F1 to Fn is thus greatly improved.

7. 发明专利

JPS63243926A COMPRESSING DEVICE FOR OPTICAL PULSE 失效
公开(公告)号：JPS63243926A
公开(公告)日：1988-10-11
申请号：JP7636287
申请日：1987-03-31
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NAKAZAWA MASATAKA , NAKAJIMA TAKASHI , KUBOTA HIROKAZU , AOMI YOSHIYUKI
IPC分类号： G02B6/00 , G02B27/00 , G02B27/28 , G02F1/35
摘要： PURPOSE:To permit compression of optical pulses at a low loss with high efficiency by noticing the large material dispersion occurring in the high refractive indices of TeO2 and TiO2 single crystal prisms to increase transmissivity and to shorten inter-prism spacing. CONSTITUTION:The optical pulses of a light source 1 for high-output optical pulses are received in a single mode optical fiber 2 and are chirped positive in the propagation process of the optical pulses. The positive chirp pulses emitted from the fiber 2 are passed through an abnormal dispersion medium 3 disposed with two Brewster prisms 3C, 3C' consisting of the single crystal TeO2 or the single crystal TiO2 in parallel with each other to compress the optical pulses. The deflection direction of the incident pulses is intersected orthogonally with the C-axis 001 of the crystal to parallel the ordinary light, by which the Brewster prisms utilizing the extra ordinary light are utilized. The transmissivity is increased and the inter-prism spacing is shortened by noticing the large material dispersion of the single crystal prisms in such a manner, by which the compression of the optical pulses at the low loss with the high efficiency is permitted.

8. 发明专利

JP2002333532A PHOTONIC CRYSTAL FIBER 失效
公开(公告)号：JP2002333532A
公开(公告)日：2002-11-22
申请号：JP2001136312
申请日：2001-05-07
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： TANAKA MASATOSHI , YAMATORI SHINYA , FUJITA MORIYUKI , NAKAZAWA MASATAKA , KUBOTA HIROKAZU , KAWANISHI SATOKI
IPC分类号： G02B6/00 , C03B37/012 , G02B6/02
摘要： PROBLEM TO BE SOLVED: To provide an SMF with a large core diameter by decreasing the refractive index of the core in a photonic crystal fiber. SOLUTION: The photonic crystal fiber has a porous part as the clad 6 having a large number of pores 7 running in the axial direction of the optical fiber and also has pores 8 in the core 5. The diameter of the pores 7 in the clad 6 is larger than the diameter of the pores 8 in the core 5. Thereby, the equivalent difference in the refractive index between the core 5 and the clad 6 can be decreased to increase the core diameter which satisfies the single mode conditions.

9. 发明专利

JP2002232043A ULTRASHORT PULSE FIBER LASER SOURCE 失效
公开(公告)号：JP2002232043A
公开(公告)日：2002-08-16
申请号：JP2001022230
申请日：2001-01-30
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KUBOTA HIROKAZU , NAKAZAWA MASATAKA
IPC分类号： G02F1/365 , H01S3/06
摘要： PROBLEM TO BE SOLVED: To generate an optical pulse having a pulse width of sub-picosecond and an arranged waveform directly from a mode synchronizing ring laser without using an optical compressor. SOLUTION: A mode synchronizing ring laser device comprises an optical amplifier 1, a band-pass type optical filter 2, an optical modulator 3 and ring resonators each formed by connecting like a ring a single mode optical fiber in which the average value of the group velocity dispersion is abnormal dispersion, is also comprises an output coupler for taking out an optical pulse generated in the resonators. By using a dispersion reducing optical fiber 7 in which the size of abnormal dispersion reduces in the travelling direction of optical pulse and a dispersion increasing optical fiber 8 in which the size of abnormal dispersion increases in the travelling direction of optical pulse as one or whole of the single mode optical fiber, one part of the power of the optical pulse whose pulse width is reduced by the dispersion reducing optical fiber is taken out of the output coupler 5, and the residual power of the optical pulse is inputted into the dispersion increasing optical fiber to extend the pulse width and is turned around in the resonators.

10. 发明专利

JP2002098852A PHOTONIC CRYSTAL FIBER AND METHOD FOR MANUFACTURING THE SAME 失效
公开(公告)号：JP2002098852A
公开(公告)日：2002-04-05
申请号：JP2000287521
申请日：2000-09-21
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： G02B6/032 , C03B37/012 , C03B37/027 , C03B37/028 , G02B6/02 , G02B6/20 , G02B6/10
摘要： PROBLEM TO BE SOLVED: To provide a photonic crystal fiber having variable dispersion values and wavelength which can propagate. SOLUTION: The fiber has a porous part 12 where a great number of pores 12a are most densely arranged, and a core part 11 formed as a solid state in the center of the porous part 12. Each pore 12a is formed into an elliptic cross section so as to make the lattice constants a, b different from each other in two directions perpendicular to the center axis Z1 of the fiber.

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