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1. 发明专利

JPH11274625A Optical fiber amplifier and optical fiber amplifier for bidirectional optical transmission employing it 失效
标题翻译：用于双向光学传输的光纤放大器和光纤放大器
公开(公告)号：JPH11274625A
公开(公告)日：1999-10-08
申请号：JP7062898
申请日：1998-03-19
申请人： Nec Corp , 日本電気株式会社
发明人： YOKOYAMA JUN
IPC分类号： G02B6/00 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/10 , H01S3/23 , H04B10/00 , H04B10/27 , H04B10/29 , H04B10/297 , H04B10/02 , H04B10/16 , H04B10/17 , H04B10/24
CPC分类号： H04B10/2972 , H01S3/0078 , H01S3/06787 , H01S3/09415 , H01S3/10023 , H01S3/2333 , H04B10/2912
摘要： PROBLEM TO BE SOLVED: To reduce the size by providing means for inputting/outputting a signal light and an amplified signal light at one end of an optical amplifying medium having the other end arranged with an exciting light source, and entering a signal light to the optical amplifying medium through an optical filter transmitting only an exciting light from the other end and reflecting the signal light thereby eliminating a conventional optical multiplexer. SOLUTION: A signal light enters from the optical I/O terminal 1 of an optical circulator 101 into an erbium added optical fiber 103 connected with an optical I/O terminal 2. An exciting light from an exciting light source 107 transmits through a grating fiber 105 and enters into the erbium added optical fiber 103 thus amplifying the signal light optically. The signal light is reflected on a grating fiber 10 to pass through the erbium added optical fiber 103 again and to enter into the optical I/O terminal 2 of the optical circulator 101 thus outputting an amplified signal light from an optical I/O terminal 3. This arrangement eliminates the need of optical multiplexer.
摘要翻译：要解决的问题：为了减小尺寸，通过提供用于输入/输出信号光的装置和放大的信号光，该光放大介质的一端具有布置有激发光源的另一端，并将信号光输入到光放大介质通过仅从另一端传输激发光的光滤波器反射信号光，从而消除传统的光复用器。解决方案：信号光从光环行器101的光I / O端子1进入与光I / O端子2连接的添加铒的光纤103.来自激发光源107的激发光透过光栅纤维 105并进入添加铒的光纤103，从而光学地放大信号光。信号光在光栅纤维10上反射，再次通过添加铒的光纤103，并进入光环行器101的光I / O端子2，从而输出来自光I / O端子3的放大信号光这种布置消除了光复用器的需要。

2. 发明专利

JP2000298295A OPTICAL ADM 失效
公开(公告)号：JP2000298295A
公开(公告)日：2000-10-24
申请号：JP10852999
申请日：1999-04-15
申请人： NEC CORP
发明人： YOKOYAMA JUN , NAKABAYASHI YUKINOBU
IPC分类号： G02F1/313
摘要： PROBLEM TO BE SOLVED: To obtain an optical ADM which can be made small-sized, lightweight, and low-priced, can be arrayed, and can adjust the light power of each path. SOLUTION: An input #1 (Add signal), after having its level adjusted by a level adjustment part 17, is outputted to an output #1 via a 2×1 optical switch 16. A 1×2 optical switch 13 selects a level adjustment part 14 or 15 and outputs an input #2. One of the outputs of the level adjustment parts 15 and 17 is selected by the 2×1 optical switch 16. A bar state is formed, when the 2×1 optical switch 16 selects the level adjustment part 17 and a cross state is formed when the switch 16 selects the level adjustment part 15. The input #2 is a signal from a demultiplexer, and when the 1×2 optical switch 13 selects the level adjustment part 14, the signal is dropped to the output #2 after level adjustment by the level adjustment part 14.

3. 发明专利

JP2000098136A VARIABLE LIGHT ATTENUATOR 失效
公开(公告)号：JP2000098136A
公开(公告)日：2000-04-07
申请号：JP26989198
申请日：1998-09-24
申请人： NEC CORP
发明人： YOKOYAMA JUN
IPC分类号： G02B6/00 , B81B3/00 , G02B6/26 , G02B6/35 , G02B26/08
摘要： PROBLEM TO BE SOLVED: To provide a variable light attenuator which ensures low power consumption, attains easy and accurate attenuation control of light intensity from the outside and has low polarization dependency. SOLUTION: The variable light attenuator has a 1st optical waveguide having a curved part at the terminal part, a 2nd optical waveguide having a curved part curved in the reverse direction and formed near the 1st optical waveguide at the terminal part and a light reflecting part having a reflecting part 106 which reflects light emergent from the 1st optical waveguide at the terminal part and couples the light to the 2nd optical waveguide. The light reflecting part also has a turning part which turns the reflecting part 106 around an axis perpendicular to the 1st optical waveguide. The turning part which turns the reflecting part is a hinge type micromachine 102 having a hinge part which supports the reflecting part 106 and an electrode formed at the bottom of the hinge part and turning the hinge part under voltage applied on the electrode. A soln. type resin whose refractive index is almost equal to that of the 1st optical waveguide is disposed between the terminal part and the reflecting part 106.

4. 发明专利

JPH06214194A OPTICAL ISOLATOR 失效
公开(公告)号：JPH06214194A
公开(公告)日：1994-08-05
申请号：JP713593
申请日：1993-01-20
申请人： NEC CORP
发明人： YOKOYAMA JUN
IPC分类号： G02B27/28 , G02F1/09
摘要： PURPOSE:To obtain an optical isolator without the dispersion of polarization by composing plural polarizers of a set of two mediums with equal thickness and having birefringet property and arranging the polarizers so that an ordinary ray in a first polarizer and an extraordinary ray in a second polarizer are generated when a polarization light is made incident on the first and the second polarizers from the forward direction. CONSTITUTION:A plural number of polarizers 1, 3, 4, 6 are composed of a set of two mediums with equal thickness and having bi-refringent property. A light incident from an optical fiber 7 passes through a first polarizer 1, a first Faraday rotator 2, a second polarizer 3, a third polarizer 4, a second Faraday rotator 5 and a fourth polarizer 6 and is made incident on an optical fiber 8 in the order of forward travel. Respective polarizers 1, 3, 4, 6 are composed of a birefringent crystal such as rutile, their optical axis is inclined by 45 degrees to the traveling direction of light and the polarizers function so as to make an ordinary ray pass as it is and an extraordinary ray shift in parallel. Respective Faraday rotators 2, 5 also act so as to rotate the polarization direction by 45 degrees.

5. 发明专利

JPH11160569A OPTICAL COUPLING CIRCUIT 失效
公开(公告)号：JPH11160569A
公开(公告)日：1999-06-18
申请号：JP32326297
申请日：1997-11-25
申请人： NEC CORP
发明人： YOKOYAMA JUN
IPC分类号： G02B6/26 , G02B6/32 , G02F1/09
摘要： PROBLEM TO BE SOLVED: To actualize the optical coupling circuit which is easily adjusted and can be made small-sized. SOLUTION: Substrates 110, 120, and 130 are arranged in array in this order so that their surfaces are parallel to one another. On the surface of the substrate 110, a V groove 111 is formed which extends in parallel to the array direction of the substrates 110, 120, and 130, and an end part of an optical fiber 101 is fixed in the V groove 111. On the surface of the substrate 120, recessed parts 121 and 122 are formed and arranged in order from the substrate 110 to the substrate 130. A lens 103 is fixed in the recessed part 121 and a lens 104 is fixed in the recessed part 122. On the surface of the substrate 130, a V groove 131 is formed which extends in parallel to the array of the substrates 110, 120, and 130, and an end part of an optical fiber 102 is fixed in the V groove 131. The positions of the substrates 110, 120, and 130 perpendicular to the optical axis are adjusted to adjust the optical axis.

6. 发明专利

JPH09166725A CONNECTION STRUCTURE FOR LOW POLARIZATION DEPENDENT OPTICAL FIBER 失效
公开(公告)号：JPH09166725A
公开(公告)日：1997-06-24
申请号：JP32664395
申请日：1995-12-15
申请人： NEC CORP
发明人： YOKOYAMA JUN
IPC分类号： G02B6/32
摘要： PROBLEM TO BE SOLVED: To suppress light returned by reflection and loss polarization dependency in connection between plural optical fibers of which end faces are obliquely ground. SOLUTION: In the case of mutually connecting a 1st optical fiber 11 having a 1st end face 16 ground obliquely to a face vertical to an optical axis and a 2nd optical fiber 14 having a 2nd end face 17 obliquely ground similarly to the 1st end face 16, a 1st face including the 1st optical axis and the normal of the 1st end face 16 and a 2nd face including a 2nd optical axis and the normal of the 2nd end face 17 are arranged so as to make an about 90 deg. angle with each other. The incident/outgoing parts of the 1st and 2nd optical fibers 11, 14 are respectively provided with 1st and 2nd lenses 12, 13 for converging light. Since a loss difference between P polarized light and S polarized light generated on the obliquely ground end faces 16, 17 for P polarization and S polarization can be mutually canceled by shifting the 90 deg. outgoing angle, loss polarization dependency can be suppressed to a low level.

7. 发明专利

JPH10239638A OPTICAL CIRCULATOR 失效
公开(公告)号：JPH10239638A
公开(公告)日：1998-09-11
申请号：JP34599297
申请日：1997-12-16
申请人： NEC CORP , TOKIN CORP
发明人： KATO HIROYUKI , YOKOYAMA JUN , HASHIMA MANABU
IPC分类号： G02B27/28 , G02F1/09
摘要： PROBLEM TO BE SOLVED: To provide an optical circulator which obtains a high value of isolation. SOLUTION: A birefringent element 13a separates incident light from a light incidence port 17a into two polarized light whose places of polarization are orthogonal. Rotation of planes of polarization of these two orthogonal polarized light and arrangement of planes of polarization are performed by reciprocal rotation element 12a and a Farady rotator 11a. Further, rotation for synthesis of two polarized light is performed by a Farady rotator 11b and a reciprocal rotation element 12b after optical paths are determined in accordance with directions of planes of polarization by a composite polarizing prism 14, and light reaches a birefringence element 13b. Light is emitted to a light incidence/ exit port 17b after synthesis there. A set of optical systems having the same arrangement are arranged on the opposite side of the Farady rotator 11b.

8. 发明专利

JPH0798423A OPTICAL MULTIPLEXER 失效
公开(公告)号：JPH0798423A
公开(公告)日：1995-04-11
申请号：JP12752494
申请日：1994-06-09
申请人： NEC CORP
发明人： YOKOYAMA JUN
IPC分类号： G02B6/293
摘要： PURPOSE:To realize the small-sized optical multiplexer which is simple in constitution. CONSTITUTION:This optical multiplexer 61 has first to fourth input and output terminals 521 to 524. A light signal 12 emitted from the first input/output terminal 521 is partly reflected by a branch film 63 formed on one surface of a glass plate 62 and is introduced to the second input/output terminal 522. The remaining light signal transmits the glass plate 62, transmits a wavelength synthesizing film 64 formed on the other surface as well and is introduced to the third input/output terminal 523. Exciting light 14 emitted from the fourth output terminal 24 is reflected by this wavelength synthesizing film 64 and is introduced to the third input/output terminal 523. Since the glass plate 62 is one sheet as compared with heretofore, the constitution is simplified. Particularly, the thickness (t) of a substrate is so set that the misalignment quantity of the optical axis by refraction at the time of incidence on the substrate is larger than a beam diameter. Leaking light is further decreased by adding an aperture to the substrate.

9. 发明专利

JPH05136490A OPTICAL FIBER AMPLIFIER 失效
公开(公告)号：JPH05136490A
公开(公告)日：1993-06-01
申请号：JP29599391
申请日：1991-11-12
申请人： NEC CORP
发明人： YOKOYAMA JUN
IPC分类号： G02B27/28 , G02F1/35 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/10 , H01S3/131 , H04B10/29 , H04B10/291
摘要： PURPOSE:To obtain a wave synthesizing and dividing means excellent in separated wavelength precision by causing an optical circulator having first to third photoelectric input-output terminals to amplify outgoing signal light into an output signal, and supplying excitation light received from the third photoelectric input-output terminals to an optical fiber from the first photoelectric input-output terminals. CONSTITUTION:Input signal light 6a is supplied to an erbium ion-doped optical fiber 1 from an input-side optical fiber 9 through an optical isolator 4. Excitation light generated by an excitation light source 3 which excites erbium ions is supplied to the port-3 of an optical circulator 2, and transmitted to the erbium ion-doped optical fiber 1 from the port-1. The excitation light is supplied to the optical fiber 1 from a direction opposite to the incident direction of the signal light. Besides the signal light amplified in the optical fiber 1 is supplied to the port-1 of the optical circulator 1, and transmitted to the output optical fiber 10 from the port-2.

10. 发明专利

JP2000162516A WAVELENGTH VARIABLE FILTER 失效
公开(公告)号：JP2000162516A
公开(公告)日：2000-06-16
申请号：JP33805698
申请日：1998-11-27
申请人： NEC CORP
发明人： YOKOYAMA JUN
IPC分类号： G02B26/00 , G02B5/28 , G02B6/12
摘要： PROBLEM TO BE SOLVED: To provide wavelength selectivity, to make constitution simple and to make power consumption low by providing a diaphragm type micromachine having a half mirror and arranged between opposed optical fibers so as to be opposed to them, moving the micromachine according to a signal from the outside and changing the length of a Fabry-Perot resonator constituted of the half mirror. SOLUTION: This filter is constituted of two opposed optical fibers 106 and 107, an optical waveguide substrate 101 where a tapered type optical waveguide is formed, the tapered parts 102 and 103 of the optical waveguide, a groove part 104 formed on the substrate 101 and the diaphragm type micromachine 105 arranged in the groove part 104. The micromachine 105 is constituted of a main body, the diaphragm, a spacer, an electrode and the half mirror. The length of the Fabry-Perot resonator is changed by voltage applied to the micromachine 105, so that selected wavelength is changed.

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