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11. 发明专利

JPH10148596A LIGHT REFLECTION MEASURING CIRCUIT 失效
公开(公告)号：JPH10148596A
公开(公告)日：1998-06-02
申请号：JP30536796
申请日：1996-11-15
申请人： NIPPON TELEGRAPH & TELEPHONE , HOTATE KAZUO , SAIDA TAKASHI
发明人： TSUJI YUKITSUGU , HORIGUCHI TSUNEO , HOTATE KAZUO , SAIDA TAKASHI
IPC分类号： G01M11/00 , G01M11/02
摘要： PROBLEM TO BE SOLVED: To provide a light reflection measuring circuit, in which the measurement can be made on a long optical fiber even in case of a low interference light source or a light source having a large interval of optical frequency, and the measurement can be made with high accuracy by eliminating the effect of response lag of the light source. SOLUTION: A reflectometry (OCDR) utilizing synthesis of light wave coherence function is employed. A laser 11 is a light source outputting a light pulse having width Δy at an interval ΔT wherein the i-th light pulse has an optical frequency fi. At the tome of switching the optical frequency, a measuring light is outputted after the laser output is settled through control with an optical switch and the transient part in the light frequency modulation of the laser 11 is masked. An outgoing light from the laser 11 is branched through a photocoupler 4 into a reference light and a measuring light. The measuring light is introduced to an object, i.e., a component 3 to be measured, and the reflected light is taken out through the photocoupler 4. A beat signal of the reflected light and a reference light outputted from the photocoupler 4 is received by a light receiver 2.

12. 发明专利

JP2003131054A PLANAR OPTICAL CIRCUIT 审中-公开
公开(公告)号：JP2003131054A
公开(公告)日：2003-05-08
申请号：JP2001326811
申请日：2001-10-24
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MIZUNO TAKAYUKI , KITO TSUTOMU , SAIDA TAKASHI , HIBINO YOSHINORI
IPC分类号： G02B6/122
摘要： PROBLEM TO BE SOLVED: To provide a small planar optical circuit capable of suppressing the size of an intersection part while an excessive loss is reduced. SOLUTION: One waveguide 101 of core width W1 crosses the other waveguide 102 of core width (W) at a crossing angle θ. Here, the crossing angle θ exists somewhere in acute angle range (0 deg.

13. 发明专利

JP2002328244A OPTICAL COMPONENT 失效
公开(公告)号：JP2002328244A
公开(公告)日：2002-11-15
申请号：JP2001134418
申请日：2001-05-01
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： HASHIMOTO TOSHIKAZU , OGAWA IKUO , SAIDA TAKASHI , KASAHARA RYOICHI
IPC分类号： G02B6/26 , G02B6/122 , G02B6/30 , G02B6/42
摘要： PROBLEM TO BE SOLVED: To provide an optical component which suppresses loss and reflection at an optically connected part with a simple and small structure. SOLUTION: The optical component 1 having an optical waveguide is a single mode optical waveguide having an input part and an output part of light in the vicinity of the end part of the optical waveguide and is provided with at least one optical waveguide structure 1-1 having a part 1-3a to which a light field incompatible with a transmission mode is made incident and a part 1-1a which has a prescribed length and adjusts the field diameter and the phase of an emitting light.

14. 发明专利

JP2002221630A INTERFERENCE DEVICE OPTICAL CIRCUIT AND ITS MANUFACTURING METHOD 失效
公开(公告)号：JP2002221630A
公开(公告)日：2002-08-09
申请号：JP2001017943
申请日：2001-01-26
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： GO TAKASHI , ABE ATSUSHI , INOUE YASUYUKI , SAIDA TAKASHI , OKUNO MASAYUKI
IPC分类号： G02B6/126 , G01B9/02 , G02B6/12 , G02B6/13
摘要： PROBLEM TO BE SOLVED: To independently adjust an optical path length (phase) to TE polarization and TM polarization. SOLUTION: Thin film heaters 4a and 4b as two kinds of heat-treating regions having different widths W1 and w2 are provided on a waveguide core 2. When the thin film heaters 4a and 4b are electrically energized and heat- treated, a clad layer 3 is changed in quality, stress exerting on the waveguide core 2 is changed and whereby polarization dependence is controlled. Then, TE polarization and TM polarization are made independent and permanent performance refractive index (double refractive index) is controlled by changing the widths of the thin film heaters 4a and 4b and a quantity of energizing. Thus, for example, TE and TM are respectively made to coincide with a phase difference λ/2 and a phase difference zero.

15. 发明专利

JP2001350045A OPTICAL WAVEGUIDE 失效
公开(公告)号：JP2001350045A
公开(公告)日：2001-12-21
申请号：JP2000167338
申请日：2000-06-05
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SAIDA TAKASHI , KASAHARA RYOICHI , HIDA YASUHIRO , SUGITA AKIO , TANAKA TAKUYA
IPC分类号： G02B6/122 , G02B6/14 , G02B6/30
摘要： PROBLEM TO BE SOLVED: To provide an optical waveguide, capable of enlarging a field shape of light in the lateral direction and in the longitudinal direction and reducing coupling loss, using simple structure. SOLUTION: The optical waveguide 20, consisting of a tapered optical waveguide 21 which smoothly enlarges the width of a core and a light field converting optical waveguide 22 which is connected to one end of the tapered optical waveguide 21, is formed on a substrate 2, the core of the light field converting optical waveguide 22 is formed into multilayered structure, which is composed of at least three layers laminated in the direction orthogonal to the substrate 2 and in which refractive indexes of adjacent layers are different from each other, and whereby the confinement of light in the core is weakened locally. Thus, the field of light is longitudinally widened, and the field of light is widened longitudinally and laterally, respectively coupled with an effect of laterally widening the field of light by the tapered optical waveguide 21.

16. 发明专利

JP2001242494A OPTICAL SIGNAL PROCESSING CIRCUIT 失效
公开(公告)号：JP2001242494A
公开(公告)日：2001-09-07
申请号：JP2000389477
申请日：2000-12-21
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKIGUCHI KOICHI , OKAMOTO KATSUNARI , SAIDA TAKASHI , KASAHARA RYOICHI
IPC分类号： G02F1/313 , G02F1/01 , H04B10/27 , H04B10/272 , H04B10/291 , H04B10/524 , H04B10/54 , H04Q3/52 , H04B10/02 , H04B10/20
摘要： PROBLEM TO BE SOLVED: To provide an optical signal processing circuit, in which degrees of freedom for operation is high, in which the number of optical gate switches is always two pieces without having to depend upon the number of processing optical packets and which is economical. SOLUTION: An input optical signal string is demultiplexed into plural signal strings in a first optical signal demultiplexer 8a, and demultiplexed plural optical signal strings are delayed respectively be desired times in variable delay lines 9a to 9d and after these delayed plural optical signal strings are multiplexed in a first optical multiplexer 10a, a desired optical signal is sucessively extracted from respective optical signal strings by gating them in a first optical gate switch 11a and the optical signal which is successively extracted is demultiplexed in a second optical demultiplexer 8b and optical signal strings in a desired time order are outputted respectively, by delaying respectively these demultiplexed optical signals by desired times in variable delay lines 9e to 9h and optical signal strings from the variable delay lines 9e to 9h are multiplexed in a second optical multiplexer 10b and one optical signal string, in which all become complete among these multiplexed plural optical signal strings is outputted by gating them in a second optical gate switch 11b.

17. 发明专利

JP2001221925A LIGHT SPOT SIZE TRANSFORMING UNIT AND ITS MANUFACTURING METHOD 失效
公开(公告)号：JP2001221925A
公开(公告)日：2001-08-17
申请号：JP2000030766
申请日：2000-02-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： HASHIZUME YASUAKI , KASAHARA RYOICHI , SAIDA TAKASHI , INOUE YASUYUKI
IPC分类号： G02B6/14 , G02B6/122 , G02B6/13
摘要： PROBLEM TO BE SOLVED: To provide a light spot size transforming unit capable of stably reducing a connection loss with an optical fiber and its manufacturing method. SOLUTION: In the light spot size transforming unit which is provided with an input waveguide 14, an output waveguide 15 having a fixed core width narrower than the width of the input waveguide 14, and a taper waveguide 16 smoothly connecting the input waveguide 14 to the output waveguide 15, falling down of the core of the output waveguide 15 owing to a heat treatment in the case of forming an upper clad 13 is restrained by providing a fall preventing core 17 which crosses with the core of the output waveguide 15.

18. 发明专利

JP2001194542A OPTICAL FILTER 失效
公开(公告)号：JP2001194542A
公开(公告)日：2001-07-19
申请号：JP2000003104
申请日：2000-01-12
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SAIDA TAKASHI , TAKIGUCHI KOICHI , HIBINO YOSHINORI , OKAMOTO KATSUNARI
IPC分类号： G02B6/14 , G02B6/12
摘要： PROBLEM TO BE SOLVED: To provide an optical filter which is stable against change in environment or lapse of time and whose filter characteristics can be precisely designed. SOLUTION: The optical filter 1 is constituted such that an inputting optical waveguide 3, mode connecting means 4, mode converting means 5 and outputting optical waveguide 6 are formed and combined in this order on a substrate 2, whereas the mode connecting means is structured, with the optical waveguide shifted in the direction orthogonally crossing a light propagating direction at more than one place.

19. 发明专利

JP2003107261A MONITOR FOR MULTI-WAVELENGTH POLARIZED WAVE 审中-公开
公开(公告)号：JP2003107261A
公开(公告)日：2003-04-09
申请号：JP2001297978
申请日：2001-09-27
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SAIDA TAKASHI , MINO SHINJI
IPC分类号： G01J4/04 , G01M11/00 , G01M11/02 , G02B6/12 , G02B6/122 , G02F1/313
摘要： PROBLEM TO BE SOLVED: To measure the polarized wave of a wavelength multiplexed optical signal for each wavelength on a monitor for polarized wave. SOLUTION: A monitor 101 for multi-wavelength polarized wave separates the wavelength multiplexed optical signal inputted to an input light port 10 into optical signals 102a to 102d for each wavelength by optical demultiplexer 11. The optical signals 102a to 102d of respective wavelengths are led to polarization-dependent optical circuits 12a to 12d, and the outputs according with polarization are measured by photodetector arrays 13a to 13d respectively.

20. 发明专利

JP2002217832A POLARIZATION CONTROLLER 失效
公开(公告)号：JP2002217832A
公开(公告)日：2002-08-02
申请号：JP2001006775
申请日：2001-01-15
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SAIDA TAKASHI , OKAMOTO KATSUNARI , TAKIGUCHI KOICHI , HASHIZUME YASUAKI
IPC分类号： G02B27/28 , G02B6/293 , H04B10/07 , H04B10/2507 , H04B10/2569 , H04B10/291 , H04J14/00 , H04J14/02 , H04B10/02 , H04B10/18
摘要： PROBLEM TO BE SOLVED: To restore orthogonality between adjacent channels by independently controlling individual polarization states of optical signals subjected to wavelength multiplexing. SOLUTION: This polarization controller is provided with an optical demultiplexer 2 for demultiplexing an input optical signal, including a plurality of optical signals transmitted by a plurality of wavelength channels of different wavelengths into an optical signal of a simple wavelength in each wavelength channel, polarization controllers 31 to 3n for controlling the optical signals demultiplexed by the optical demultiplexer 2 for making the optical signals cross orthogonally at the adjacent wavelength channels, on the basis of monitored results from polarization monitors 51 to 5n, optical taps 41 to 4n for branching optical signals outputted from the controllers 31 to 3n, and an optical multiplexer 6 connected to one output of each of the optical taps 41 to 4n, and for multiplexing a plurality of the optical signals to output an output optical signal. The monitors 51 to 5n are connected to the other output of each of the optical taps 41 to 4n, for monitoring the polarization states of the optical signals and for notifying the controllers 31 to 3n of the monitored results.

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