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1. 发明专利

JP2001196666A WDM COUPLER FOR DOUBLE CLAD FIBER STIMULATION 失效
公开(公告)号：JP2001196666A
公开(公告)日：2001-07-19
申请号：JP2000001620
申请日：2000-01-07
申请人： SHINETSU CHEMICAL CO , KDD CORP
发明人： ABE ATSUSHI , MANTOKU NOBUYASU , MAKIKAWA SHINJI , EJIMA MASAKI , MIMURA HIDENORI , NODA YUKIO , NAKAI TETSUYA , TANI TOSHIO
IPC分类号： H01S3/06 , G02B6/036 , G02B6/22
摘要： PROBLEM TO BE SOLVED: To provide a WDM coupler for double clad fiber stimulation for efficient stimulation of signal light and stimulation light with a double clad fiber where a rare earth element is added to a core. SOLUTION: A WDM coupler comprises a first fiber for signal light incidence, a second fiber for stimulation light incidence, an optical multiplexing/ demultiplexing means for optical multiplexing/demultiplexing the light, and a third fiber for propagation of multiplexed light. Here, the third fiber comprises a core for propagation of single mode light, a first clad for propagation of multi-mode light, and a second clad outside of it.

2. 发明专利

JP2001133651A MODE CONVERSION OPTICAL FIBER 失效
公开(公告)号：JP2001133651A
公开(公告)日：2001-05-18
申请号：JP31201699
申请日：1999-11-02
申请人： DDI CORP , SHINETSU CHEMICAL CO
发明人： MIMURA HIDENORI , NODA YUKIO , NAKAI TETSUYA , TANI TOSHIO , ABE ATSUSHI , MANTOKU NOBUYASU , MAKIKAWA SHINJI , EJIMA MASAKI
IPC分类号： G02B6/028 , G02B6/18
摘要： PROBLEM TO BE SOLVED: To provide an optical fiber of high mode conversion efficiency, which efficiently makes exciting light incident on a rare earth element doped optical fiber, having a small core diameter, even if the light emitted from a pigtail of exciting LD light is multi-mode light. SOLUTION: This optical fiber is comprised of a core 1, a first cladding 2 surrounding the outer periphery of the core 1, and a second cladding surrounding the outer periphery of the first clad 2, and the refractive index of the first cladding 2 is gradually reduced from the center toward the outer periphery in the diametrical direction, and the refractive index of the core is higher than that of the first cladding, and the refractive index of the first cladding is higher than that of the second cladding.

3. 发明专利

JP2000286489A OPTICAL AMPLIFIER 失效
公开(公告)号：JP2000286489A
公开(公告)日：2000-10-13
申请号：JP8746599
申请日：1999-03-30
申请人： KDD CORP
发明人： MIMURA HIDENORI , NODA YUKIO , NAKAI TETSUYA , TANI TOSHIO
IPC分类号： H01S3/10 , H01S3/06
摘要： PROBLEM TO BE SOLVED: To obtain an optical amplifier which amplifies light rays in batch in both C and L bands. SOLUTION: A WDM coupler 28a multiplexes the signal light made incident from an input-side optical fiber 30 with an exciting light which is outputted from an exciting laser diode 20a and transmitted through a fiber 24a and makes the combined light incident to a core layer 12 from the other surface of an optical amplifying fiber 10. The exciting light emitted from another laser diode 20b is propagated through a fiber 24a and made incident to an inner clad layer 14 from the other end face of the optical amplifying fiber 10 by means of another WDM coupler 28b.

4. 发明专利

JP2000196167A OPTICAL AMPLIFIER 失效
公开(公告)号：JP2000196167A
公开(公告)日：2000-07-14
申请号：JP37071398
申请日：1998-12-25
申请人： KDD CORP
发明人： MIMURA HIDENORI , NODA YUKIO , NAKAI TETSUYA , TANI TOSHIO
IPC分类号： H01S3/06 , H01S3/067 , H01S3/07 , H01S3/094 , H01S3/0941 , H01S3/10 , H04B10/25 , H04B10/29 , H04B10/291 , H04J14/00 , H04J14/02 , H04B10/16 , H04B10/17
摘要： PROBLEM TO BE SOLVED: To provide an optical amplifier capable of amplifying a light of 1.55 μm band, light of 1.58 μm band, and light of 1.55 μm band and 1.58 μm band at the same time. SOLUTION: Er-doped optical amplifier fibers 12-1 to 12-n are connected together in series. WDM optical coupler 14-1 to 14-n are each arranged in front of the Er-doped optical amplifier fibers 12-1 to 12-n. The output light from exciting light sources 16-1 to 16-n can be separately fed to the Er-added optical amplifier fibers 12-1 to 12-n through the intermediary of the WDM optical coupler 14-1 to 14-n. The overall length of the Er-doped optical amplifier fibers 12-1 to 12-n is long enough to optically amplify the light of 1.58 μm band. The first Er-doped optical amplifier fibers 12-1 on an input side is so set in length as to optically amplify signal light of 1.55 μm band, and the other Er-doped optical amplifier fibers 12-2 to 12-n are regulated in length to amplify light signal of 1.55 μm band so as to stop it from being attenuated.

5. 发明专利

JP2000275451A OPTICAL MULTIPLEXER 失效
公开(公告)号：JP2000275451A
公开(公告)日：2000-10-06
申请号：JP7776899
申请日：1999-03-23
申请人： KDD CORP
发明人： MIMURA HIDENORI , NODA YUKIO , NAKAI TETSUYA , TANI TOSHIO
IPC分类号： G02B6/02 , G02B6/10
摘要： PROBLEM TO BE SOLVED: To allow light impinging on a refractive index gradient layer to efficiently shift into a core so as to multiplex certain wavelengths by providing a refractive index gradient clad layer. SOLUTION: A double clad fiber 10 includes a core layer 16 with the highest refractive index, a refractive-index gradient clad layer 18 located outside the core layer 16 and having a refractive index which is lower than the refractive index of the core layer 16 and decreases toward the outside, and an outer clad layer 20 located outside the refractive index gradient clad layer 18 and having a refractive index which is even lower than the lowest refractive index of the refractive index gradient clad layer 18. A multi-mode fiber 12 comprises a core layer 22 with a refractive index lower than the lowest refractive index of the refractive index gradient clad layer 18 and a clad layer 24 with the same refractive index as the outer clad layer 20. The outer clad layer 20 of the double clad fiber 10 and the clad layer 24 of the multi-mode fiber 12 are partially removed and the double clad fiber 10 and the multi-mode fiber 12 are bonded together in a bonding portion 14 at their respective side faces in such a manner that the refractive index gradient clad layer 18 makes direct contact with the core layer 22 over a predetermined range of length.

6. 发明专利

JP2000353838A INDUCED EMISSION BEAM GENERATING DEVICE 失效
公开(公告)号：JP2000353838A
公开(公告)日：2000-12-19
申请号：JP16605699
申请日：1999-06-11
申请人： KDD CORP
发明人： MIMURA HIDENORI , NODA YUKIO , NAKAI TETSUYA , TANI TOSHIO
IPC分类号： H01S3/06 , H01S3/067
摘要： PROBLEM TO BE SOLVED: To provide a device which generates a 0.48 μm band induced emission beam at high efficiency. SOLUTION: Reflectors 12 and 14 of 1.12-1.14 μm are arranged on both sides of an Nd-doped fiber 10, forming a resonator. An exciting LD16 generates a 0.8 μm band excitation beam. The 0.8 μm band excitation beam passes through the reflector 12 before coming into the fiber 10, and a part of it excites the Nd of the fiber 10, while a remaining part transmits the fiber 10 and the reflector 14 before entering a Tm-doped optical fiber 18, to excite the Tm of the optical fiber 18. Nd excited with the 0.8 μm band beam generates a 1.12-1.14 μm beam, and the resonator comprising the reflectors 12 and 14 causes laser oscillation. The 1.12-1.14 μm band laser beam passes through the reflector 14 and then enters the Tm-doped optical fiber 18, exciting the Tm contained in it. The Tm generates 0.48 μm band beam by the excitation of the 0.8 μm band beam and the 1.12-1.14 μm band beam.

7. 发明专利

JP2000332320A INDUCTIVE EMISSION LIGHT GENERATOR AND LUMINOUS MEDIUM 失效
公开(公告)号：JP2000332320A
公开(公告)日：2000-11-30
申请号：JP14245199
申请日：1999-05-21
申请人： KDD CORP , FURUUCHI KAGAKU KK
发明人： MIMURA HIDENORI , NODA YUKIO , NAKAI TETSUYA , TANI TOSHIO , ONO SHUNICHI , SUDO TOMOMI
IPC分类号： H01S3/06 , H01S3/094 , H01S3/17
摘要： PROBLEM TO BE SOLVED: To obtain high-power inductive emitted light at a high efficiency. SOLUTION: A double clad fiber 10 has two clads 14 and 16 on an outer surface of a core 12. A first element for generating target inductive emission light and a second element for exciting the first element by energy transfer are added to the core 12. An exciting light source 18 generates exciting light for exciting the second element. Output light of the light source 18 is directed into the inner clad 14 of the fiber 10 via a pigtail fiber 20 and a condensing lens 22. Combinations of the first and second elements include, for example, Ho and Tm, Yb and Nd, Ho and Yb, Tm and Yb, Er and Yb, Ho and Er, and Tm and Er.

8. 发明专利

JP2000241649A DEVICE FOR REDUCING LIGHT BEAM DIAMETER 失效
公开(公告)号：JP2000241649A
公开(公告)日：2000-09-08
申请号：JP3938499
申请日：1999-02-18
申请人： KDD CORP
发明人： MIMURA HIDENORI , NODA YUKIO , NAKAI TETSUYA , TANI TOSHIO
IPC分类号： G02B6/02 , G02B6/028 , G02B6/26 , G02B6/42 , H01S3/06 , H01S3/10 , G02B6/16
摘要： PROBLEM TO BE SOLVED: To provide an inexpensive light beam diameter reducing device capable of reducing a light beam diameter. SOLUTION: This device is composed of three-layer structure comprising a center core 10, a refractive index-graded layer 12 arranged outside the core 10 to be reduced gradually in its refractive index, and a clad layer 14 arranged outside thereof. A refractive index and a radius of the core 10 are represented by (n1) and (a) respectively. The layer 12 located outside the core 10 is positioned within a range from the radius (a) to a radius (b), it has the maximum refractive index of n2max in the radius (a) within the range, and the index is reduced toward its radial-directional outside to come to the minimum refractive index n2min in the radius (b). The clad layer 14 is positioned within a range from the radius (b) upto a radius (c). The refractive indexes of three layers 10, 12, 14 have a relation of n1>n2max>n2min>n3. This structure is kept to be same in a longitudinal direction.

9. 发明专利

JP2000353837A INDUCED EMISSION BEAM GENERATING DEVICE 失效
公开(公告)号：JP2000353837A
公开(公告)日：2000-12-19
申请号：JP16605599
申请日：1999-06-11
申请人： KDD CORP
发明人： MIMURA HIDENORI , NODA YUKIO , NAKAI TETSUYA , TANI TOSHIO
IPC分类号： H01S3/06 , H01S3/067 , H01S3/094 , H01S3/16
摘要： PROBLEM TO BE SOLVED: To provide a device which generates a 1.4 μm band induced emission beam at high efficiency. SOLUTION: Reflectors 12 and 14 of 1.06 μm are arranged on both sides of an Nd-doped optical fiber 10, forming a resonator. An exciting LD16 generates a 0.8 μm band excitation beam. The 0.8 μm band excitation beam passes through the reflector 12 before coming into the fiber 10, and a part of it excites the Nd of the fiber 10, while a remaining part transmits the fiber 10 and the reflector 14 before entering a Tm-doped optical fiber 18, to excite the Tm of the optical fiber 18. Nd excited with the 0.8 μm band beam generates a 1.06 μm beam, and the resonator comprising the reflectors 12 and 14 causes laser oscillation. The 1.06 μm band laser beam passes through the reflector 14 and then enters the Tm-doped fiber 18, to excite the Tm contained in it.

10. 发明专利

JP2000058953A OPTICAL AMPLIFIER 失效
公开(公告)号：JP2000058953A
公开(公告)日：2000-02-25
申请号：JP22721798
申请日：1998-08-11
申请人： KDD CORP
发明人： MIMURA HIDENORI , NODA YUKIO , NAKAI TETSUYA , TANI TOSHIO , USAMI MASASHI
IPC分类号： H01S3/10 , H01S3/06
摘要： PROBLEM TO BE SOLVED: To miniaturize an optical amplifier having the ultrabroad zone of 1.5 to 1.6 μm band. SOLUTION: A narrow strip light of 1.55 μm and a narrow strip light of 1.58 μm are made incident on the part A of a light circulator 12 from an input signal wire 10, and the lights are made incident on an optical amplifier 14 from a part B. The light outputted from the part B of the optical circulator 12 is amplified by the optical amplifier 14, and it is made incident on a reflection filter 18. The reflection filter 18 reflects the 1.55 μm strip light and it permeates through the 1.58 μm strip light. The 1.55 μm strip light reflected by the reflection filter 18 is made incident on the optical amplifier 14. The 1.58 μm strip light, which permeated through the reflection filter 18, is amplified by an optical amplifier 20, reflected by a reflection mirror 22, amplified by the optical amplifier 20, and it is made incident on the optical amplifier 14 passing through the reflection filter 18. The 1.55 μm strip light, which is made incident on the light amplifier 14, and the 1.59 μm strip light are amplified, they are made incident on the part B of the optical circulator 12, and it is outputted to an output signal wire 16 from a part C.

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