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1. 发明专利

JPH04134302A PRODUCTION OF ELLIPTIC MICROLENS 失效
公开(公告)号：JPH04134302A
公开(公告)日：1992-05-08
申请号：JP25637790
申请日：1990-09-26
申请人： NIPPON SHEET GLASS CO LTD
发明人： SEKI MASAFUMI , SATO SHIRO
IPC分类号： G02B3/00 , C03C21/00
摘要： PURPOSE:To obtain the elliptic microlens which obviates the deterioration in performance from a circular lens by providing a specific relation between the radius of the outside shape of the circular lens and the radius of a circular aperture for ion exchange. CONSTITUTION:The elliptic broken line in Fig. indicates the elliptic aperture 2 of an ion exchange control film and the elliptic solid line indicates the outside shape 3 of the elliptic microlens. A substrate 1 is a glass substrate forming the elliptic microlens. The radius r1 of the major axis of the aperture of the ion exchange control film and radius r2 of the minor axis when the major axis of the outside shape 3 of the desired elliptic microlens and the radius of the minor axis are respectively designated as a1 and a2 are so set as to satisfy 0.35

2. 发明专利

JPH0450807A WAVEGUIDE TYPE OPTICAL POLARIZED WAVE SEPARATING DEVICE 失效
公开(公告)号：JPH0450807A
公开(公告)日：1992-02-19
申请号：JP15648190
申请日：1990-06-14
申请人： NIPPON SHEET GLASS CO LTD
发明人： SEKI MASAFUMI , KOBAYASHI SHIGERU
IPC分类号： G02B6/126 , G02B6/12
摘要： PURPOSE:To separate input light beam into two each orthogonal polarized light with high isolation and low loss by constituting the device of a polarized wave separating device which utilizes a difference of coupling length of a TE mode and a TM mode of a waveguide type directional coupler, and a polarizer placed on the way of two pieces of output waveguides of the same device. CONSTITUTION:The device is constituted of polarized wave separating devices 11, 12 which utilize a difference of coupling length of a TE mode and a TM mode of a waveguide type directional coupler, and polarizers 3, 4 which are placed on the way of two pieces of output waveguides 15, 16, respectively of its device and have an azimuth conforming to a polarized light of a predominant mode propagated along the output waveguides 15, 16. When light of no- polarization is inputted to an input waveguide 10 of this device, light consisting of only almost the TM mode is outputted from one output waveguide, and from the other output waveguide, light consisting of only almost the TE mode is outputted. In such a way, the inputted light beam can be separated into two each orthogonal polarized light with high isolation and low loss, and accumulation to other device, for instance, the directional coupler can be executed.

3. 发明专利

JPH01101578A HOLOGRAM GLASS PLATE 失效
公开(公告)号：JPH01101578A
公开(公告)日：1989-04-19
申请号：JP25921287
申请日：1987-10-14
申请人： NIPPON SHEET GLASS CO LTD
发明人： YATAGAI TOYOHIKO , SEKI MASAFUMI
IPC分类号： G03H1/08
摘要： PURPOSE:To obtain a hologram plate having high diffraction efficiency and capable of reproducing a bright image by forming an area changing its refractive index by ion exchange on the surface of a glass plate or its inside in accordance with a hologram pattern calculated by a computer. CONSTITUTION:A photoresist 3 is applied to the glass base 2 obtained by vapar- depositing a masking metallic film 1, photolithograpy is executed by using a photographing dry plate 4 as a UV optical mask to transfer a mask pattern to the metallic film 1. Then, the metallic film 1 is immersed melted salt 5 for a prescribed time to execute ion exchange and to increase the refractive index of the mask aperture part, and after removing the metallic film mask, a refractive index changing area 6A with a required hologram pattern is formed in the glass base. The hologram glass plate 6 is arranged on the position of a photographic dry plate 40 in a Fourier transformation hologram optical system and only reference light 106 is projected on the plate 40, so that the same wave as Fourier transformation substance wave 104 is reproduced as a reproduced wave 107 and the reproduced wave 107 is Fourier-transformed by a lens 25 to reproduce an object wave 108.

4. 发明专利

JPS63206709A PRODUCTION OF FLUSH TYPE SINGLE MODE LIGHT GUIDE 失效
公开(公告)号：JPS63206709A
公开(公告)日：1988-08-26
申请号：JP3989187
申请日：1987-02-23
申请人： NIPPON SHEET GLASS CO LTD
发明人： SEKI MASAFUMI
IPC分类号： G02B6/13 , G02B6/134
摘要： PURPOSE:To realize a flush type single mode light guide consisting of a waveguide having nearly a circular or elliptical shape without requiring electric field impression by executing heat ion exchange in both the 1st stage and 2nd stage of a stage for ion exchange and specifying the ion exchange conditions of the 1st and 2nd stages. CONSTITUTION:A glass substrate 1 contains the univalent ion selected from a group consisting of univalent alkali ion, univalent Tl ion and Ag ion for ion exchange. After a coating film 2a for controlling the ion exchange is deposited by evaporation on one face of the substrate 1, an aperture 2c of a prescribed waveguide pattern is formed thereon to form a mask film 2b. The substrate 1 which is subjected to the 1st stage of the heat ion exchange treatment in a 1st fused salt 4a then to the removal of the mask film 2b is thereafter subjected to the 2nd stage of the heat ion exchange treatment in a 2nd fused salt 4b. The ion exchange is so executed in this case that the products D1t1 and D2t2 of the 1st and 2nd effective ion exchange constants D1, D2 and ion exchange time t1, t2 satisfy the equations I and II.

5. 发明专利

JPS62206502A WAVEGUIDE TYPE OPTICAL MULTIPLEXING/DEMULTIPLEXING CIRCUIT 失效
公开(公告)号：JPS62206502A
公开(公告)日：1987-09-11
申请号：JP4940886
申请日：1986-03-06
申请人： NIPPON SHEET GLASS CO LTD
发明人： SEKI MASAFUMI , HANADA YOSHIYUKI
IPC分类号： G02B6/12 , G02B6/122 , G02B6/28 , G02B6/293
摘要： PURPOSE:To multiplex and demultiplex optical waves with a high precision by specifying a half of the angle made between an optical waveguide for input and that for output on which a reflected light is made incident. CONSTITUTION:A band-pass filter 51 is used to demultiplex light having wavelengths lambda2 and lambda3 and is used on the condition of theta=10 deg. (theta is the filter angle) for the purpose of securing the demultiplexing characteristic. When mixed light having three kinds of waveform lambda1-lambda3 is made incident on an optical waveguide 20 for input, the light having the wavelength lambda1 is transmitted through a short wavelength pass filter 50 and is branched to an optical waveguide 22 for output. Light having wavelengths lambda2 and lambda3 reflected on the filter 50 is propagated in an optical waveguide 23 and reaches the band-pass filter 51, and the light having the wavelength lambda2 is reflected on the filter 51 and is propagated in an optical waveguide 26 and is transmitted through a band-pass filter 52 and is emitted from the end of a waveguide 27 for output. The light having the wavelength lambda3 transmitted through the filter 51 passes a band-pass filter 53 and is emitted from an optical waveguide 25 for output to the outside of substrate.

6. 发明专利

JPS6287905A PRODUCTION OF WAVEGUIDE LENS 失效
公开(公告)号：JPS6287905A
公开(公告)日：1987-04-22
申请号：JP22819685
申请日：1985-10-14
申请人： NIPPON SHEET GLASS CO LTD
发明人： SEKI MASAFUMI , WADA HIROSHI
IPC分类号： G02B6/122 , G02B6/124
摘要： PURPOSE:To permit working with good accuracy by providing a stage for forming a concave curved face part having a geodesic lens shape by machining to a substrate consisting of crystallized glass and stage for forming an optical waveguide to the substrate surface. CONSTITUTION:The concave curved face 3 constituting the geodesic lens is worked by using a grinding tool 2 consisting of a high speed steel, etc., on the surface of the free-cutting crystallized glass substrate 1 consisting of the crystallized glass internally contg. the fine-grain crystal of mica. The top end face 2A of the grinding tool 2 is preliminarily formed to the curved face of the geodesic lens and an aq. soln. of, for example, cerium oxide is coated on the face 2A of the grinding tool 2 and said face is pressed to the surface 1A of the substrate 1 at about 300rpm to machine the surface and to form the geodesically curved face 3. The waveguide layer 4 consisting of three layers formed and laminated with transparent dielectric materials is formed on the substrate surface. The crystallized glass internally contg. the fine-grain crystal of mica has the extremely good machinability. The concave curved face part constituting the geodesic lens is thereby easily machined with the high shape accuracy.

7. 发明专利

JPH0823613B2 失效
公开(公告)号：JPH0823613B2
公开(公告)日：1996-03-06
申请号：JP4940886
申请日：1986-03-06
申请人： NIPPON SHEET GLASS CO LTD
发明人： SEKI MASAFUMI , HANADA YOSHUKI
IPC分类号： G02B6/12 , G02B6/122 , G02B6/28 , G02B6/293

8. 发明专利

JPH03172804A PHOTORECEIVING BRANCHING DEVICE NON-DEPENDANT ON POLARIZATION AND IS NONSENSITIVE TO WAVELENGTH 失效
公开(公告)号：JPH03172804A
公开(公告)日：1991-07-26
申请号：JP31269889
申请日：1989-12-01
申请人： NIPPON SHEET GLASS CO LTD
发明人： SEKI MASAFUMI , NAKAMA KENICHI
IPC分类号： G02B6/122 , G02B6/12
摘要： PURPOSE:To obtain the optical branching device which does not depend on polarization and has an exact 1:1 branching ratio even if there is a slight deviation in wavelength by providing a terminal part of an input waveguide and two pieces of output waveguides having coupling parts disposed in parallel with the terminal part of this waveguide and regulating the effective length of the coupling parts. CONSTITUTION:The input waveguide 11 formed on a glass substrate 10 and two pieces of the output waveguides 17, 18 are optically coupled via the coupling parts 12, 13, 14 disposed in parallel separated equidistantly from the terminal part of the input waveguide 11. The terminal part of the input waveguide 11 is so regulated that the effective lens of the coupling part is (n+1/2)L1 (where n=0, 1, 2,...), when the distance at which the light propagating in the input waveguide 11 is coupled equally at 50% to the output waveguides 17, 18 is designated as a coupling length L1; in addition, the end position of the coupling parts is aligned to the terminal of the input waveguide 11 in order to equally couple the light power to the output waveguides 17, 18. The optical branching device which exactly attains 1:1 branching ratio is obtd. in this way.

9. 发明专利

JPH03126002A BIDIRECTIONAL ACCESS COUPLER 失效
公开(公告)号：JPH03126002A
公开(公告)日：1991-05-29
申请号：JP26460189
申请日：1989-10-11
申请人： NIPPON SHEET GLASS CO LTD
发明人： SEKI MASAFUMI
IPC分类号： G02B6/28 , G02B6/122 , H04B10/07 , H04B10/2507 , H04B10/27 , H04B10/275 , H04B10/29
摘要： PURPOSE:To inexpensively form a bidirectional network on one piece of looped optical fiber transmission line by providing a forward direction access coupler part and a backward direction access coupler part. CONSTITUTION:The light signal propagated forward in an optical fiber 12 is coupled to a main waveguide 10 and about 50% thereof is branched to a 1st taking out waveguide 20 and is coupled to an optical fiber 21. About 50% of the light signal coupled from an optical fiber 31 to a 1st delivery waveguide 30 is coupled to the main waveguide 10 and propagates forward together with about 50% of the originally propagated light signal and is coupled to an optical fiber 11. About 50% of the light signal propagated backward in the optical fiber 11 is coupled to the main waveguide 10 and about 50% is branched to a 2nd taking out waveguide 40 and is coupled to an optical fiber 41. About 50% of the light signal coupled from an optical fiber 51 to a 2nd delivery waveguide 50 is coupled to the main waveguide 10 and propagates backward together with about 50% of the originally propagated light signal and is coupled to the optical fiber 12. This coupler acts as the bidirectional access coupler in this way.

10. 发明专利

JPH02221903A MANUFACTURE OF Y-BRANCH WAVEGUIDE 失效
公开(公告)号：JPH02221903A
公开(公告)日：1990-09-04
申请号：JP4358289
申请日：1989-02-23
申请人： NIPPON SHEET GLASS CO LTD
发明人： SEKI MASAFUMI , NAKAMA KENICHI
IPC分类号： G02B6/122 , G02B6/12 , G02B6/13
摘要： PURPOSE:To obtain the Y-branch waveguide whose loss is small and stable to wavelength by superposing a diffraction grating type opening where fine opening parts are formed repeatedly on the opening of an ion exchange control film which forms a Y-branch waveguide part. CONSTITUTION:An input waveguide part 11, a Y-branch waveguide part 12, and output waveguide parts 13a and 13b are formed on a glass substrate 10. When they are formed, the ion exchange control film 20 which is a Ti thin film is used and its openings 21, 13a, and 13b are used for the input waveguide part 11 and output waveguide parts 13a and 13b respectively. Then the diffraction grating type opening where the opening parts of 2mum in width are formed at a period of 4mum is superposed on the opening 22 used for the Y-branch waveguide part 12. This ion exchange control film 20 is used to exchange heat ions as a 1st stage with molten salt containing Ti ions partially, the control film 2 is removed, and a heat ion exchange as a 2nd stage is carried out to form the waveguide.

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