Registered patents


No. Title Pat. No. Registered Date
1 Device for detecing the focal point of a convex lens Japan 1013333 1980.9
2 Refractive index profile measurement system Japan 1020548 1980.11
3 Measuring method of group deley between LP01 and LP11 modes propagating in an optical fiber supporting LP01 and LP11 modes. Japan 1103663 1982.7
4 Refractive index profile measurement system Japan 1116399 1982.10
5 Measuring method of splice loss of opical fiber Japan 1116441 1982.10
6 Measuring system of material dispersion Japan 1121418 1982.11
7 Optical fiber fusion splice system Japan 1177551 1983.11
8 Fusion splice method for single-mode optical fibers Japan 1251135 1985.2
9 Method for manufacturing preforms of polarization maintaining optical fibers Japan 1251165 1985.2
10 Fusion splice method for single-mode optical fibers Japan 1251950 1985.2
11 Splice method for optical fibers Japan 1254168 1985.3
12 Demodulation method for optical phase modulated signal Japan 1262351 1985.4
13 Polarization direction rotation apparatus Japan 1287596 1985.10
14 Core axes alignment system for optical fibers Japan 1301469 1986.2
15 Polarization maintaining optical fiber with zero dispersion Japan 1333319 1986.8
16 Optical beam shifter Japan 1398926 1987.9
17 Measuring method for optical fiber splice loss Japan 1521278 1989.9
18 Measuring method for modal delay differences in a multimodemode optical fiber Japan 1535891 1989.12
19 Measuring method for core offset of optical fiber Japan 1547753 1990.3
20 Core axes alignment system for optical fibers Japan 1565055 1990.6
21 Piezoelectric device Japan 1594653 1990.12
22 Measuring method for core offset of optical fiber Japan 1647068 1992.3
23 Method for detecting fault and open locations of optical fiber Japan 1860464 1994.7
24 Measuring system for mode field diameter of a single-mode fiber Japan 1932329 1995.5
25 Automatic optical path switching system Japan 1945798 1995.6
26 Optical fiber coupler evaluation method and system Japan 1948482 1995.7
27 Measuring method for core diameter of optical fiber Japan 1948486 1995.7
28 Optical multi-demultiplexer for multipoints communication Japan 1951276 1995.7
29 Back scattered light measurement system Japan 1970658 1995.9
30 Fiber coupler and method and apparatus for manufacturing the same Japan 2052256 1995
31 Optical transmission line switching method Japan 2111953 1995
32 Addaptive mapping method and system Japan 2504625 1996.4
33 Optical frequency division multiplexed transmission system Japan 2567680 1996.10
34 Optical fiber evaluation system Japan 2575794 1996.11
35 Optical fiber evaluation method and system Japan 2589345 1996.12
36 Real-time configuration management system for line facilities of optical fiber networks Japan 2675366 1997.7
37 Optical frequency filter Japan 2685620 1997.8
38 Optical transmission system Japan 2688652 1997.8
39 Brillouin frequency shift reference Japan 2704193 1997.10
40 Object position estimation method using stereo data from multiple viewpoints Japan 2726366 1997.12
41 Digital optical communication system Japan 2744803 1998.2
42 Method and system for measuring optical curvature distribution Japan 2747565 1998.2
43 High power acceptable optical fiber and fabrication thereof Japan 2753426 1998.2
44 Viscosity-matched silica based optical fibers and fabrication thereof Japan 2800960 1998.7
45 Method and system for measuring strain and temperature of optical waveguide Japan 2840682 1998.10
46 Frequency stabilized light source Japan 2866870 1998.12
47 Method for integration of overlapping maps Japan 2870670 1998.12
48 Water penetration detection method Japan 2878778 1999.1
49 Multi-viewpoint stereo measurement method Japan 2923063 1999.4
50 Pose estimation method Japan 2923069 1999.4
51 Subscriber optical networks and their monitoring system Japan 2965647 1999.8
52 Edge feature determination method Japan 2925707 1999.5
53 Light source with wide specral width Japan 3199195 2001.6
54 Optical time domain reflectometer Japan 3210847 2001.7
55 Metod and system for charactrization of single-mode optical fibers Japan 3257197 2001.12
56 Fiber identification method for branched optical fiber network Japan 3303271 2002.5
57 Optical time domain reflectometer Japan 3306819 2002.5
58 Low dispersion optical fiber Japan 3307518 2002.5
59 Method and apparatus for manufacturing optical ribbon fibers Japan 3356886 2002.12
60 Low dispersion optical fiber Japan 3392409 2003.1
61 Manufacturing method for optical fiber preform Japan 3439258 2003.6
62 Method and system for identifying facilities Japan 3442213 2003.6
63 Optical Fiber Evaluation Method and System USA 4997277 1991.3
UKEFranceEGermany 0348235 1994.3
CANADA 1327898 1994.3
64 High power Acceptable optical Fiber and Fabrication Thereof USA 5303318 1994.12
65 Fiber coupler and method and apparatus for manufacturing the same USA 4869570 1989.9
UK 2204145 1991.3
66 Bidirectional optical communication system Japan 4012450 2007.9




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