-
1.发明授权Mode conversion and mode separation branched dielectric waveguide element for light 失效模式转换和模式分离用于光的分支电介质波导元件
公开(公告)号：US3920314A
公开(公告)日：1975-11-18
申请号：US45033374
申请日：1974-03-12
Applicant: AGENCY IND SCIENCE TECHN
Inventor： YAJIMA HIROYOSHI
CPC classification number: G02F1/3137 , G02B6/14 , G02B6/2804
Abstract: A mode conversion and mode separation branched dielectric waveguide element for light comprising branches having optically different characteristics which are surrounded by a medium or media having different refractive indexes from that of the dielectric material or materials forming the branches. In one embodiment, one of the surrounding media is an electrooptical crystal provided with at least one pair of electrodes near the parting portion of the branches. As a modification, the branches may be connected at the opposite ends thereof to form a by-pass construction.
Abstract translation: 一种用于光的模式转换和模式分离分支电介质波导元件，包括具有光学不同特性的分支，其被介质或介质折射率不同于介质材料或形成分支的材料的介质或介质包围。 在一个实施例中，周围介质中的一个是在分支的分开部分附近设置有至少一对电极的电光晶体。 作为修改，分支可以在其相对端连接以形成旁路结构。
-
公开(公告)号：JPH01302305A
公开(公告)日：1989-12-06
申请号：JP13404188
申请日：1988-05-31
Applicant: AGENCY IND SCIENCE TECHN , HITACHI CABLE
Inventor： MIHASHI YOSHINOBU , ISHIHARA SATOSHI , YAJIMA HIROYOSHI , UETSUKA NAOTO
Abstract: PURPOSE:To miniaturize an element by forming gratings having periodical structures, whose phases are shifted from each other by 180 deg. in the light propagation direction, on first and second cores respectively. CONSTITUTION:A grating 6 as a periodical ruggedness on a core 3 is formed besides two asymmetrical cores 2 and 3 and a grating 4. Periodical structures of the grating 4 formed on the first core 2 and the grating 6 formed on the second core 3 in the coupling part have phases shifted from each other by 180 deg. in the light propagation direction. Thus, a coupling coefficient is increased, and the length of the coupling part 5 is shortened to a half conventional length, and the element is miniaturized.
-
公开(公告)号：JPS6424206A
公开(公告)日：1989-01-26
申请号：JP18012187
申请日：1987-07-21
Applicant: AGENCY IND SCIENCE TECHN , HITACHI CABLE
Inventor： MIHASHI YOSHINOBU , ISHIHARA SATOSHI , YAJIMA HIROYOSHI , UETSUKA NAOTO
Abstract: PURPOSE:To permit the use of quartz glass for a refractive index modulation type grating by vitrifying porous glass deposited on a substrate by adding a dopant for increasing the refractive index periodically. CONSTITUTION:After forming a porous glass layer 2 on the surface of a quartz substrate 1 and impregnating the porous glass layer 2 with a resist 3 dropped thereon, the porous glass layer 2 is heated. Then, interference fringes are formed on the porous glass layer by generating interference between two fluxes of obliquely irradiated He-Ne laser light 4. Porous glass parts 5 from which uncrosslinked resists 3 are removed with a period of an order of the wavelength of the laser light 4 are prepd. by developing and drying the porous glass layer. When a dopant soln. 7 for increasing the refractive index, such as Ge(OCH3)4 + H2O + CH3OH, etc., is dropped thereon, the soln. is impregnated into the porous glass parts 5, forming porous glass parts 8 contg. GeO2. By heating the porous glass together with the substrate 1 at a specified temp. in O2 atmosphere, the porous glass parts 6 and the porous glass parts 8 contg. GeO2 are transformed to vitreous glass. Thus, a grating 9 having refractive index variable with a period of an order of the wavelength of the laser light is formed on the substrate 1.
-
公开(公告)号：JPS623217A
公开(公告)日：1987-01-09
申请号：JP14318885
申请日：1985-06-28
Applicant: AGENCY IND SCIENCE TECHN
Inventor： KIKUCHI KEISUKE , YAJIMA HIROYOSHI , MIHASHI YOSHINOBU , MUKAI SEIJI
Abstract: PURPOSE:To detect a focus position by detecting the focus position by utilizing the fact that the difference signal output of a split photodetector is inverted in phase at a focusing point where a reflector is positioned. CONSTITUTION:Divergent light from a laser 1 is converged on the reflecting surface 4 of an optical disk, etc., through a lens 3 and reflected light from the reflecting surface 4 is passed through the lens 3 again and returned to a BDLD 1 which operates as the split detector. The direction of the peak intensity of divergent light from the BDLD 1 is deflected periodically by flowing a high frequency current to divided electrodes. Divergent light 2' whose direction of the peak internsity is deflected periodically is converged on the reflecting surface 4 through the lens 3. In this case, the converged spot 2'' on the reflecting surface 4 is fixed regardless of the deflection when the reflecting surface 4 is positioned at the focusing position (b), but in phase and opposite in phase on the basis of the deflection direction when the reflecting surface 4 is at positions (a) and (c) before and behind the focusing point. Consequently, which side of the focusing point the spot is defocused to is detected from the phase of the difference signal.
-
公开(公告)号：JPH0653610A
公开(公告)日：1994-02-25
申请号：JP25965691
申请日：1991-09-11
Applicant: AGENCY IND SCIENCE TECHN
Inventor： WATANABE MASANOBU , MUKAI SEIJI , MATSUBARA KOJI , YAJIMA HIROYOSHI
Abstract: PURPOSE:To generate crossing mode and also, changing the light output ratio by the adjustment of its gain difference so as to improve the output ratio, in the case that the length of a laser resonator is longer than the length of the coupled two waveguide paths, by making the gain of the clad between anodes enough larger than the outer clad. CONSTITUTION:An n-GaAs layer 2, an n-AlGaAs layer 3, a GaAs active layer 4, a p-AlGaAs 5, a p-GaAs layer 6, and an SiN insulating layer 7 are forming order on a GaAs substrate 1. Waveguide paths parallel with each other are formed below two parallel electrodes 10 and 11. To generate crossing mode in the case that a resonator L is longer than the coupled length Lc of the two waveguide paths, that is, in case that L>Lc, the gain of an even analogous mode needs to be raised. To raise the gain of the even analogous mode, it is required only to raise the gain of the clad area C between anodes higher than especially outer clad areas A and E, whereby it is made into a mesa structure, and the active layer is made uniform GaAs.
-
Patent Agency Ranking
公开(公告)号：JPH0563303A
公开(公告)日：1993-03-12
申请号：JP25310891
申请日：1991-09-04
Applicant: AGENCY IND SCIENCE TECHN
Inventor： OGURA MUTSURO , WATANABE MASANOBU , ITO HIDEO , MORI MASAHIKO , MUKAI SEIJI , YAJIMA HIROYOSHI , CHIN TOMOO
IPC: H01S5/00
Abstract: PURPOSE:To manufacture the title optical functional element in optical waveguide structure discharging satisfactory optical confining function in simple process on a substrate while reducing the obstruction factor to the increase in the integration degree as well as gaining the freedom of layout. CONSTITUTION:A pair of insulating films 3, 3 in specific width are formed on an n-GaAs substrate 2. Next, an AlGaAs lower side clad layer 6, a GaAs waveguide layer 7 and an AlGaAs upper side clad layer 8 are successively grown by MOCVD step on the substrate main surface exposed by a striped window 4 between the pair of insulating films 3, 3 so As to erect an optical waveguide structure. In such a constitution, if the main surface of the substrate 2 comprises (1, 0, 0) surfaces, the side surfaces of the optical waveguide structure have the oblique surfaces comprising B surfaces (1, 1, 1).
-
公开(公告)号：JPH01302304A
公开(公告)日：1989-12-06
申请号：JP13404288
申请日：1988-05-31
Applicant: AGENCY IND SCIENCE TECHN , HITACHI CABLE
Inventor： MIHASHI YOSHINOBU , ISHIHARA SATOSHI , YAJIMA HIROYOSHI , UETSUKA NAOTO
Abstract: PURPOSE:To improve reliability and to miniaturize the element by forming the projecting parts of gratings to the refractive index larger than the refractive index of a core and forming a clad having the refractive index smaller than the refractive index of the core to the part above the ruggedness of the grating. CONSTITUTION:The core 2 consisting of SiO2-TiO2 glass is formed on a quartz substrate 1. The projecting parts 5 of the grating 3 consisting of Nb2O2 having the refractive index nf are formed on the core 2 consisting of the SiO2-TiO2 glass and the clad 4 consisting of SiO2 glass having the refractive index nc smaller than nf is formed thereon. The change in the element characteristics by sticking of dirt, water drops, etc., is eliminated with the flush type and the coefft. of coupling is increased in this way. The element is thus miniaturized.
-
公开(公告)号：JPS642009A
公开(公告)日：1989-01-06
申请号：JP15852187
申请日：1987-06-25
Applicant: AGENCY IND SCIENCE TECHN , HITACHI CABLE
Inventor： YAJIMA HIROYOSHI , ISHIHARA SATOSHI , MIHASHI YOSHINOBU , UETSUKA NAOTO
Abstract: PURPOSE:To decrease a loss and to improve reliability by providing a groove part to a silicon substrate and forming a space between a light guide and optical fiber joint part, thereby stably maintaining the coupling part. CONSTITUTION:The optical fiber 3 guided by fiber guides 2, 2' and the light guide 1 are supported by the silicon substrate 1 and the groove 6 is provided to the substrate 4 near the joint part of the fiber 3 and the light guide 1. The space is formed in the joint part so that the dealing with the expansion of the adhesive agent by a change of the ambient temp. is improved; in addition, the self-aligning effect by the surface tension at the time of welding and connecting by using a laser acts satisfactorily. As a result, the coupling part is stably maintained and the loss is suppressed. The reliability is thus enhanced.
-
公开(公告)号：JPS61236190A
公开(公告)日：1986-10-21
申请号：JP7802185
申请日：1985-04-12
Applicant: AGENCY IND SCIENCE TECHN
Inventor： MUKAI SEIJI , YAJIMA HIROYOSHI , WATANABE MASANOBU , ITO HIDEO
IPC: H01S5/00
Abstract: PURPOSE:To make the two-dimensional switching of the radiated beam possible in the direction of scanning or diflection, by providing a electron density distribution in an active layer controlled by the electrode with the gradient not only in the direction of the plane parallel to the element substrate but also in the other directions. CONSTITUTION:On the P-type semiconductor substrate 101, the N-type semiconductor 102 is grown, on which the groove 102a for current injection is formed. The P-type semiconductor 103, the N-type semiconductors 104, 105 and 106, and the P-type semiconductors 107 and 108 are grown. After the insulation film 109 is formed, the grooves 109a for current injection is installed thereon, and the electrodes 101, 111 and 112 for current injection are formed. When the voltage is impressed between the electrodes 112 and 111, the current is injected from the groove 109a and the active region 113b emits light. On the other hand, when the voltage is impressed between the electrodes 110 and 111, the current is injected from the groove 109b, and the lower active region 113a emits light. As the injection currents into the active regions 113a and 113b can be independently controlled, the gradient of the injection current density between the active layers can be controlled. Thus, the deflection of beam occurs in the upper and lower directions in the semiconductor layers.
-
公开(公告)号：JPH04131918A
公开(公告)日：1992-05-06
申请号：JP25471490
申请日：1990-09-25
Applicant: AGENCY IND SCIENCE TECHN
Inventor： ITO HIDEO , MUKAI SEIJI , YAJIMA HIROYOSHI
Abstract: PURPOSE:To simply the stably generate a fringe as a single semiconductor element without using any external optical parts by connecting optically two laser active areas to each other in a semiconductor laser structure. CONSTITUTION:The laser active areas 1-1 and 1-2 containing a laser beam radiating end face 5 or 6 respectively are formed in a single semiconductor laser structure 7 and at the same time connected optically to each other. In this optical connection, both areas 1-1 and 1-2 are set sufficiently close to each other in the structure 7. In such a constitution, the lateral leakage beams of both laser active areas can enter these areas with each other via a high refractive index layer part 13. Thus it is possible to stably generate a fringe as a single semiconductor element without using any external optical parts.
-
-
-
-
-
-
-
-
-
Search Results
25
records
(took 0.025 seconds)
