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1. 发明专利

JPS56158926A WIDE-BAND LIGHT WAVE METER 失效
公开(公告)号：JPS56158926A
公开(公告)日：1981-12-08
申请号：JP6170980
申请日：1980-05-12
申请人： NIPPON TELEGRAPH & TELEPHONE , OUYOU KOUDEN KENKIYUUSHITSU KK
发明人： HASHIMOTO KUNIO , OKADA KENJI , AOSHIMA KENJI , ITOU TOMOYUKI
IPC分类号： G01J3/447 , G01J3/12 , G01J9/00 , G01J9/02
摘要： PURPOSE:To reduce size, extend a measuring wavelength range and decrease insertion loss with a simple constitution by combining a polarizer, an optically active crystal and an analyzer having rotating function. CONSTITUTION:Light from an input side fiber 1 is collimated by a lens 2 and is passed through a polarizer 10 of calcite or the like, so that one linearly polarized beam of light is entered to an optically active crystal 11. The crystal 11 differs in optical rotation of polarized waves depending upon wavelengths and the light transmitted through the crystal 11 is entered to an analyzer having rotating function, by which it receives the attenuation differing with wavelengths, thence it is supplied to an optical power meter 6 via a condensing lens 2' and an exit side fiber 1'. If the scale of the meter 6 is provided in correspondence to the wavelength at which the light transmitted through an analzyer 12 goes zero, the meter 6 functions as a wavemeter. It is also possible to obtain an equivalent function by making the rate of compensation of an optical phase compensating plate correspond to waveleng ths in place of the analyzer 12.

2. 发明专利

JPS55138708A OPTICAL LENS 失效
公开(公告)号：JPS55138708A
公开(公告)日：1980-10-29
申请号：JP4674379
申请日：1979-04-18
申请人： NIPPON TELEGRAPH & TELEPHONE , OUYOU KOUDEN KENKIYUUSHITSU KK
发明人： HASHIMOTO KUNIO , NOSU KIYOSHI , AOSHIMA KENJI , ITOU TOMOYUKI
IPC分类号： G02B6/32 , G02B3/00 , G02B9/04 , G02B9/06
摘要： PURPOSE:To improve the coupling efficiency of fibers and readily vary the rear focal length by opposing the two glass rods which are flat at one end face in such a manner that the flat faces become mutually on the outer side. CONSTITUTION:Circular cylindrical glass rods 3, 4 which have a flat surface at one faces 3', 4' and whose other end faces 3'', 4'' are made spherical are opposed and these glass rods 3, 4 are so disposed that their optical axes align. Such constitution enables the effect as a condenser lens to be provided by the opposing two spherical faces 3'', 4'' if the refractive indices of the glass rods 3, 4 are let n. A concave lens 5 has a value of refractive index 1/n and has the operation equivalent to that of one convex lens and the points that it differs from one convex lens include flatness of both end faces, no relation to the length of glass rods, feasibility of changing rear focus fb value by changing the spacing between the opposing spherical faces, ease of supporting, arbitrary and easy workability of outside diameter and curvature spherical faces because material is ordinary glass, hence low cost.

3. 发明专利

JPS54121156A MEASURING METHOD OF CONSTRUCTION PARAMATERS IN OPTICAL FIBERS 失效
公开(公告)号：JPS54121156A
公开(公告)日：1979-09-20
申请号：JP2805078
申请日：1978-03-11
申请人： NIPPON TELEGRAPH & TELEPHONE , OUYOU KOUDEN KENKIYUUSHITSU KK
发明人： SUZUKI NOBUO , NAWATA KIYOSHI , ITOU TOMOYUKI
IPC分类号： G01M11/00 , G02B6/00
摘要： PURPOSE:To rapidly measure the construction parameters of optical fibers with high accuracy with the overlapping of two images as a reference by using a shearing interferometer. CONSTITUTION:For example, in measuring the eccentricity quantity of a core, an objective lens 3 is so controlled and focused as to permit the definite measurement of the end face of the optical fiber to be measured. Next, a mirror 10 is moved in such a manner that the outer side of the core part 2 of the image I makes contact to the inner wall of the clad part 1' of the image II and in this state a Dove prism 6 is rotated and adjusted to the state wherein the two images I and II have rotated 180 deg. like (b). Finally, the mirror 10 is moved that the clearance created between the outside circumference of the core part 2 of the two images and the inner wall of the clad part 1' is eliminated and the outside circumference of the core part 2 of the two images and the inner wall of the clad part 1' again make contact. If, here, the movement of the mirror 10 at the time of (a) is let to be L1 and, after rotation by 180 deg. like (b), that of the mirror 10 moved to eliminate the clearance to be L2, then the eccentricity quantity e of the core is given by e = 1/2(L1 - L2.

4. 发明专利

JPS57207219A PRODUCTION OF POLARIZATION CANCELLATION CIRCUIT 失效
公开(公告)号：JPS57207219A
公开(公告)日：1982-12-18
申请号：JP9149781
申请日：1981-06-16
申请人： NIPPON TELEGRAPH & TELEPHONE , OUYOU KOUDEN KENKIYUUSHITSU KK
发明人： FUJII YOUJI , SARUWATARI MASATOSHI , MINOWA JIYUNICHIROU , ITOU TOMOYUKI , AOSHIMA KENJI
IPC分类号： G02B27/28
摘要： PURPOSE:To facilitate manufacture by constituting a polarization cancellation circuit by using two pieces of trapezoidal blocks which are constituted by adhering parallelogram prisms and rectangular prisms. CONSTITUTION:Parallelogram prisms 10, 11 and rectangular prisms 8, 9 having prescribed shapes are manufactured, and multilayered dielectric films S1, S2 are formed on the surfaces inclusive of hypotenuses of the prisms 8, 9 and the surfaces of the prisms 10, 11 corresponding to said surfaces, then these are adhered together, whereby trapezoidal blocks having the effect of polarization splitters are manufactured. Such trapezoidal blocks are pressed and set on a base plate by facing the surfaces including the bottoms of the trapezoidal blocks on the basis of a rectangular parallelepiped block set on said base plate, and the one trapezoidal block is placed along the rectangular parallelepiped block, whereby the blocks are positioned and set.

5. 发明专利

JPS575013A OPTICAL MODE MIXER 失效
公开(公告)号：JPS575013A
公开(公告)日：1982-01-11
申请号：JP7944780
申请日：1980-06-12
申请人： NIPPON TELEGRAPH & TELEPHONE , OUYOU KOUDEN KENKIYUUSHITSU KK
发明人： SANO KOUICHI , HASHIMOTO KUNIO , AOSHIMA KENJI , ITOU TOMOYUKI
IPC分类号： G02B6/14 , G02B6/28
摘要： PURPOSE:To mix optical modes efficiently with simple and samll-sized construction by using a glass bar having random refractive index fluctuations internally. CONSTITUTION:The light which is made incident to a glass bar 5 having random refractive index fluctuations internally from an incident optical fiber 3 is bent randomly by Snell's law and emits at the angle differing from the incident angle at the output part of the glass bar. Since the angle of propagation in general corresponds to the numbers of the modes of the light propagating in a fiber, the change in this angle signifies mode conversion and this turns out that the light has received mode conversion in the glass bar. Further, the pass of beams of light takes random loci and therefore the optical path length varies with each incident mode and the phasss thereof are random as well. This glass bar is made by applying thermal strains to multicomponent type glass.

6. 发明专利

JPS55138702A OPTICAL DIRECTIONAL COUPLER 失效
公开(公告)号：JPS55138702A
公开(公告)日：1980-10-29
申请号：JP4672079
申请日：1979-04-18
申请人： NIPPON TELEGRAPH & TELEPHONE , OUYOU KOUDEN KENKIYUUSHITSU KK
发明人： KOBAYASHI IKUTAROU , OKADA KENJI , AOSHIMA KENJI , ITOU TOMOYUKI
IPC分类号： G02B6/00 , G01R33/032 , G02B6/293 , G02B6/34
摘要： PURPOSE:To eliminate the coupling of unnecessary light and make possible the measurement of weak light by making use of the crystal which has double refractive action. CONSTITUTION:Light from a fiber 2 is collimated by a lens 4 and enters calcite 9 and if the axial direction of the calcite 9 is beforehand suitably selected, the light is divided to two optical paths 10, 11 by its double refraction. The respective lights are entered to fibers 1, 3 by lenses 5, 6. Similarly, part of the light from the fiber 3 advances to the fiber 1. The double refraction phenomenon depends upon the plane of polarization of light. When the light of the optical path 13 incident from the point 17 causes the end face reflection of the calcite 9 at the point 19, this reflected light has the polarization perpendicular to the plane of the paper and therefore the light fully returns in the optical path 13 and does not advance to the optical path 14. Hence, when the device is constituted by using calcite, the coupling from the fiber 1-3 or from the fiber 3-1 does not occur. In this way, the powerful light is entered from the fiber 1-2 and at the same time the weak light from the fiber 2 may be observed at the output end of the fiber 3 without being hampered by the reflection of this light.

7. 发明专利

JPS5292537A VARIABLE ATTENUATOR FOR PHOTO FIBERS 失效
公开(公告)号：JPS5292537A
公开(公告)日：1977-08-04
申请号：JP788376
申请日：1976-01-29
申请人： NIPPON TELEGRAPH & TELEPHONE , OUYOU KOUDEN KENKIYUUSHITSU KK
发明人： HASHIMOTO KUNIO , FUJII YOUJI , AOSHIMA KENJI , ITOU TOMOYUKI
IPC分类号： G02B6/00 , G02F1/13 , G02F1/17
摘要： PURPOSE:To improve the accuracy by using a liquid crystal in which a dynamic scattering occurs as a fluid core of photo fibers.

8. 发明专利

JPS5292531A PHOTO FIBER CONNECTOR CENTERING DEVICE 失效
公开(公告)号：JPS5292531A
公开(公告)日：1977-08-04
申请号：JP788476
申请日：1976-01-29
申请人： NIPPON TELEGRAPH & TELEPHONE , OUYOU KOUDEN KENKIYUUSHITSU KK
发明人： HASHIMOTO KUNIO , KOYAMA MASAKI , AOSHIMA KENJI , ITOU TOMOYUKI
IPC分类号： G02B6/36 , G02B6/38
摘要： PURPOSE:To perform the centering of connectors with high accuracy with the use of a small device by reflecting the light which has entered the centering collar in parallel to the collar axis at the same locus as that of the incident light and by causing the light which has entered off the center to follow a locus which is different from that of the incident light.

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