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1. 发明专利

JP2003152253A OPTICAL AMPLIFIER AND OPTICAL COMMUNICATION SYSTEM 审中-公开
公开(公告)号：JP2003152253A
公开(公告)日：2003-05-23
申请号：JP2001347797
申请日：2001-11-13
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： KADOI MOTOTAKA , MOBARA MASAICHI
IPC分类号： G02B6/00 , H01S3/06 , H01S3/067 , H01S3/10
摘要： PROBLEM TO BE SOLVED: To provide an optical amplifier capable of reducing a power consumption and capable of reducing temperature dependence of gain by easy control. SOLUTION: The optical amplifier 100 comprises, from an input port 101 toward an output port 102, an optical isolator 111, optical coupler 121, optical amplification fiber 141, optical coupler 122, optical isolator 112, gain equalizer filter 150, variable light attenuator 160, optical isolator 113, optical coupler 123, optical amplification fiber 142, optical coupler 124, and optical isolator 114, in this order. Tm element is added to a core region of the optical amplification fibers 141 and 142, and the signal light of a wavelength within a prescribed wavelength band is optically amplified when an excitation light is supplied. The gain equalizer filter 150 has such loss spectrum as shifts toward short- wavelength side as temperature rises, to equalize the gain in optical amplification of the signal light in the optical amplification fibers 141 and 142.

2. 发明专利

JP2003149497A COMPONENT FOR PROCESSING OPTICAL SIGNAL 审中-公开
公开(公告)号：JP2003149497A
公开(公告)日：2003-05-21
申请号：JP2001349127
申请日：2001-11-14
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： TAKUSHIMA MICHIKO , SANO TOMOKI , SUGANUMA HIROSHI , MOBARA MASAICHI
IPC分类号： G02B6/34
摘要： PROBLEM TO BE SOLVED: To provide an inexpensive optical signal processing component with a simple configuration. SOLUTION: In this optical signal processing component 1, light emitted from an end face of an optical fiber 101 is collimated by a first lens 111, made incident on a first diffraction grating element 121, diffracted at an angle of diffraction corresponding to a wavelength in the first diffraction grating element 121, and in addition, diffracted again by a second diffraction grating element 122. The light outputted from the second diffraction grating element 122 has been made parallel resulting from wavelength separation, is subjected to processing corresponding to the wavelength by a spatial filter 130, and is condensed by a second lens 112 to be made incident from an end face of an optical fiber 102.

3. 发明专利

JP2003086871A EXCITED LIGHT SOURCE UNIT, RAMAN AMPLIFIER, AND OPTICAL TRANSMISSION SYSTEM 审中-公开
公开(公告)号：JP2003086871A
公开(公告)日：2003-03-20
申请号：JP2002177669
申请日：2002-06-18
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： INOUE MASAYUKI , KADOI MOTOTAKA , MOBARA MASAICHI
IPC分类号： G02F1/35 , H01S3/0933 , H01S3/10 , H01S3/30 , H01S5/02
摘要： PROBLEM TO BE SOLVED: To provide such an excited light source unit for Raman amplification or the like that is provided with a structure for adjusting an output signal light spectrum in an amplified wavelength bandwidth. SOLUTION: This excited light source unit (LU) is provided with N sets of excited light sources (11 to 14) to output excited lights with N (>=2) channels having different wavelengths to each other, a multiplexer (2) for multiplexing the excited lights having N channels, and an output structure (3) for supplying the excited light outputted from the multiplexer (2) to an optical fiber (L) for Raman amplification. Especially, at least one of the light sources (11 to 14) is provided with a wavelength variable excited light source that can change the channel wavelength of excited light to be outputted, and such a structure allows for adjustment of the excited light spectrum, thus improving the controllability of the spectrum of outputted signal light.

4. 发明专利

JP2002236224A METHOD AND DEVICE FOR MANUFACTURING FIBER GRATING, AND FIBER GRATING 失效
公开(公告)号：JP2002236224A
公开(公告)日：2002-08-23
申请号：JP2001032736
申请日：2001-02-08
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： MOBARA MASAICHI
IPC分类号： G02B5/18 , G02B6/02 , G02B6/10 , G02B6/16
摘要： PROBLEM TO BE SOLVED: To provide a method and a device for inexpensively providing various long-period fiber gratings having different loss central wavelengths or loss characteristics and various-long period fiber gratings having different characteristics. SOLUTION: The device 1 for manufacturing the long-period fiber grating is provided with a laser device 2, a mirror 3, an intensity modulating mask 4, a mask holding member 5 and an optical fiber placing pedestal 6. The mask holding member 5 is provided with a rotating mechanism which rotates the intensity modulating mask 4 so that a pattern which the intensity modulating mask has forms a prescribed angle to the longitudinal direction of the optical fiber. Various long-period fiber gratings having various loss peak wavelengths are manufactured without replaceing the mask by suitably adjusting the angle.

5. 发明专利

JP2001272552A OPTICAL WAVEGUIDE TYPE DIFFRACTION GRATING 失效
公开(公告)号：JP2001272552A
公开(公告)日：2001-10-05
申请号：JP2000085182
申请日：2000-03-24
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： SHIOZAKI MANABU , IWASHIMA TORU , MOBARA MASAICHI , MURASHIMA KIYOTAKA
IPC分类号： G02B6/122 , G02B6/02 , G02B6/10
摘要： PROBLEM TO BE SOLVED: To provide an optical waveguide type diffraction grating capable of shortening an area where a refractive index modulation is formed and capable of flattening a refractive index in a reflected wavelength band. SOLUTION: In the optical waveguide type diffraction grating 10, the refractive index modulation is formed in a core area 11 in a fixed area in the longitudinal direction of the optical waveguide, the optical cycle of the refractive index modulation is substantially constant, the phase of the refractive index modulation is inverted using a phase inverting part as a boundary, and one or two phase inverting parts exist. Further, in the optical waveguide type diffraction grating 10, an absolute value of a parameter R (formula (22)) is below 0.25.

6. 发明专利

JP2001091759A OPTICAL LOSS FILTER AND ITS PRODUCTION 失效
公开(公告)号：JP2001091759A
公开(公告)日：2001-04-06
申请号：JP26543499
申请日：1999-09-20
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： HARUMOTO MICHIKO , MOBARA MASAICHI
IPC分类号： G02B6/02 , G02B6/34 , G02B6/10
摘要： PROBLEM TO BE SOLVED: To provide an optical loss filter which has transmission characteristics with high accuracy in a wide frequency region and which can be produced in a small size and to provide its production method. SOLUTION: The optical loss filter is formed in an optical waveguide 10 having a core having a specified refractive index, and has a phase shift member 20 where the difference in the rotation of the phase between the core mode and the clad mode changes by the changes in the refractive index of the core, a first long-period grating LPG-d and a second long-period grating LPG-e disposed in the front and back positions of the phase shift member 20, respectively. In the first long-period grating, the maximum in attenuation by coupling between the core mode and the clad mode appears at a first wavelength. In the second long-period grating, the maximum of attenuation by the coupling appears at the second wavelength. The two wavelengths giving the two maxima in the transmission characteristics of light propagating the first long-period grating, phase shift member and second long-period grating vary from the first wavelength and second wavelength by the changes in the refractive index of the core.

7. 发明专利

JP2001033639A LONG-PERIOD FIBER GRATING ELEMENT AND ITS MANUFACTURE 失效
公开(公告)号：JP2001033639A
公开(公告)日：2001-02-09
申请号：JP21070399
申请日：1999-07-26
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： ISHIKAWA SHINJI , ENOMOTO TADASHI , MOBARA MASAICHI , HARUMOTO MICHIKO
IPC分类号： G02B5/18 , G02B6/00 , G02B6/02 , G02B6/10
摘要： PROBLEM TO BE SOLVED: To provide a long-period fiber grating element having a stable characteristic, and to provide a manufacturing method thereof. SOLUTION: In this long-period fiber grating element 1, an optical fiber 10 mainly consisting of silica glass includes a core part 11 added with GeO2 and a clad part 12 around the core part 11. A grating 20 formed in the core part 11 has alternate high-refractive index parts 21 and low-refractive index parts 22, while a period of the refractive index modulation is a long period of about several hundred μm. Both or one of hydroxyl groups and water molecules are diffused and infiltrated into a surface vicinity 12A of the clad part 12 around the core part 11 formed with the grating 20. A total concentration of the hydroxyl group or water molecule diffused and infiltrated into the surface vicinity 12A of the clad part 12 is preferably above 100 ppm.

8. 发明专利

JP2000329952A METHOD AND DEVICE FOR MANUFACTURING OPTICAL WAVEGUIDE COMPONENT 失效
公开(公告)号：JP2000329952A
公开(公告)日：2000-11-30
申请号：JP13683699
申请日：1999-05-18
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： ISHIKAWA SHINJI , ENOMOTO TADASHI , MOBARA MASAICHI , HARUMOTO MICHIKO
IPC分类号： G02B6/02 , G02B5/18 , G02B6/00 , G02B6/10
摘要： PROBLEM TO BE SOLVED: To reduce secular changes of manufacture conditions and to prolong the life of a phase grating, etc., which forms cyclic stripe lights by making it hard for ultraviolet ray, which has cyclic stripe light projected so as to form a diffraction grating, etc., in part of an optical waveguide, to have photochemical reaction with the air. SOLUTION: This device is equipped with an ultraviolet-ray source such as an excimer laser 4 and an ultraviolet-ray cyclic stripe forming means such as a phase grating 3. In this case, the passage area for ultraviolet rays from the ultraviolet-ray cyclic stripe forming means to the optical waveguide arrangement place, where an optical waveguide part such as an optical fiber forming the diffraction grating is arranged, is put in a container 7. A mixed gas atmosphere having 30 to 80% relative humidity of rare gas and water vapor is produced in the inside 7a of the container 7.

9. 发明专利

JP2000323778A LIGHT EMITTING DEVICE 失效
公开(公告)号：JP2000323778A
公开(公告)日：2000-11-24
申请号：JP12746599
申请日：1999-05-07
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： MURASHIMA KIYOTAKA , MOBARA MASAICHI
IPC分类号： G02B6/42 , H01S5/00 , H01S5/022
摘要： PROBLEM TO BE SOLVED: To provide a light emitting device which can realize higher airtightness while the alignment between a semiconductor optical amplifier and an optical fiber is secured. SOLUTION: A light emitting device 1 is provided with a fiber grating 14 having first and second end sections 14a and 14b, a semiconductor optical amplifier 16 which has a light emitting surface 16a optically coupled with the first end section 14a of the grating 14 and a light reflecting surface 16b and emits light when carriers are injected into the amplifier 16, and a housing 12 which has a window 38a through which the light from the second end section 14b of the grating 14 can be transmitted and airtightly houses the grating 14 and amplifier 16. Since the amplifier 16 is airtightly sealed in the house 12, the service life of the amplifier 16 is prolonged and the characteristics of the laser light source of the device 1 are not deteriorated.

10. 发明专利

JP2000304947A LONG-CYCLE GRATING ELEMENT 失效
公开(公告)号：JP2000304947A
公开(公告)日：2000-11-02
申请号：JP2000036899
申请日：2000-02-15
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： HARUMOTO MICHIKO , MOBARA MASAICHI , ISHIKAWA SHINJI , ENOMOTO TADASHI
IPC分类号： G02B6/00 , G02B5/18 , G02B6/02 , G02B6/10 , G02B6/16
摘要： PROBLEM TO BE SOLVED: To obtain a long-cycle grating which removes only a core-mode light of a desirable wavelength in an in-use wavelength band (1525 to 1610 nm). SOLUTION: The long-cycle grating element is formed in an optical fiber 10. The optical fiber 10 includes a core area 11 and a clad area 12 and refractive index modulation having cycles Λ are is formed in the core area 11 to form the long-cycle grating element. In the in-use wavelength band (1525 to 1610 nm), the absolute value of a loss peak due to mode coupling regarding refractive index modulated components having cycles Λ is

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