41 results about "Butt coupling" patented technology

A method for automatically regulating core of waveguide-optical fiber based on multi-object evolution algorithm includes treating discrete genetic screening process by stable culling policy, applying father generation cross and real value variation in searching process, only change two individual bodies in each generation of genetic population and having no relationship to artificial weight-setting in process of realizing multi-object optimization.

Disclosed is an optical conversion element capable of highly efficient optical coupling between a silicon waveguide and a general single-mode optical fiber only by butt-coupling without requiring anti-reflective coating. One embodiment is an optical conversion element that includes a waveguide structure and converts a mode field of guided light and is characterized in that at least a dual core is included, an innermost core of the dual core is a silicon inverse tapered thin wire core, a first outer core is a forward tapered ridge core having a ridge structure formed of an oxide film with only width of the ridge core changing. The first outer core is positioned on a narrow width side of the innermost core.

This invention relates to optical fiber systems where light is launched into and propagated in the fundamental mode of graded-index multimode fiber. Generally, it is not possible to launch light exclusively into the fundamental mode of graded-index multimode fiber by butt-coupling the multimode fiber to an arbitrary fiber carrying light from a source; several other modes may be launched. By inserting a length of a special singlemode fiber between an arbitrary fiber carrying light from a source and the graded-index multimode fiber, light can be launched exclusively into the fundamental mode of the graded-index multimode fiber. The special singlemode fiber has a modal pattern that matches the fundamental Gaussian modal pattern of the graded-index multimode fiber, which permits launching of the light into only the fundamental mode of the multi mode fiber. Several applications for propagation in the fundamental mode of graded-index multimode fiber arises. These include: fiber optic sensor systems, high data rate communication links, low modal noise links, high security links, etc.

The invention discloses a waveguide butt-coupling type separated absorption multiplication avalanche diode which is capable of detecting weak communication optical signals, and relates to the fields of semiconductor photoelectric devices and optical interconnects. The waveguide butt-coupling type separated absorption multiplication avalanche diode comprises a p+ type ohmic contact electrode (101), p+ type ohmic contact layer (102), an absorption layer (103), a p type charge region (104), a high field multiplication region (105), a n+ type ohmic contact electrode (106), a n+ type ohmic contact region (107), an insulating buried layer (108), a substrate (109) and a ridge waveguide (110). The waveguide butt-coupling type separated absorption multiplication avalanche diode is characterized in that the p type charge region (104) is located at the terminal bottom of the ridge waveguide (110), and the absorption layer (103) is located at the top of the p type charge region (104) and is connected with a terminal inner ridge region of the ridge waveguide (110); and the high field multiplication region (105) and the n+ ohmic contact region (107) are sequentially arranged close to the p type charge region (104), have the same thickness as that of an outer ridge of the ridge waveguide (110), and extend perpendicular to the optical transmission direction of the ridge waveguide (110). As it can be seen from a schematic diagram of an I-V curve corresponding to the diode, excellent multiplication is achieved for the device.

A centroidal centralizing method for automatic butt coupling between waveguide and optical fibre features that the peak position can be determined by measuring the calculating the mass center near the peak, and includes initializing, coarse steps, fine steps, integration to find mass center, and repeating said steps for finding out the mass center of another dimension. Its equipment is composed of voltage-stabilized power supply, heat-stability light source, two sets of 6D precise regulator, regulator for fixing waveguide, drive controller of step motor, microscopic photography and observing system, high-resolution optical powermeter, and computer.

The invention relates to a multiple-quantum well waveguide butt-coupling method comprising the following steps of: A, carrying out primary epitaxy on a substrate to obtain a multiple-quantum well structure; B, after a dielectric film is deposited, carrying out mask photoetching, and removing a waveguide part of a first region requiring secondary epitaxy by using a three-step etching method; C, placing an epitaxial wafer into metal organic chemical vapor deposition equipment for high-temperature treatment; and D, carrying out secondary epitaxial growth to obtain a second multiple-quantum well structure. By using the method, an attractive interface etching appearance can be achieved, cavities caused during growth can be avoided, the butting quality can be effectively improved, the coupling loss can be reduced, and good repeatability can be obtained. The multiple-quantum well waveguide butt-coupling method can be used for manufacture and batch production of various photoelectronic integrated chips.

The invention discloses a multiple quantum well wave-guide end-to-end coupling process comprising, (1) epitaxially growing the multiple quantum well structure of the device A on the substrate, (2) depositing a layer of dielectric-coating, and mask photo-etching, etching the multiple quantum structure besides the A strips, (3) epitaxially growing the multiple quantum well structure of the device B, (4) mask photo-etching the less satisfying growing quality portion of the A and B interface. (5) extending optimization of the designed body material to the larger area, to serve simultaneously as both the up waveguide of device A and B, and the coupling waveguide between them. The process of the invention may be used to eliminate the inanity and multiple quantum well bending caused by direct linkage, to lower coupling loss and to increase optical output power. The invention can be applied to the making of a plurality of photoelectron integrated device.

An optical device comprises first, second and third elements fabricated on a common substrate. The first element comprises an active waveguide structure supporting a first optical mode, the second element comprises a passive waveguide structure supporting a second optical mode, and the third element, at least partly butt coupled to the first element, comprises an intermediate waveguide structure. If the first optical mode differs from the second optical mode by more than a predetermined amount, a tapered waveguide structure in at least one of the second and third elements facilitates efficient adiabatic transformation between the first optical mode and the second optical mode. Mutual alignments of the first, second and third elements are defined using lithographic alignment marks.

The invention provides an optical waveguide array-optical fiber array automatic butt-coupling parallel index optimization method. The optical waveguide array-optical fiber array automatic butt-coupling parallel index optimization method comprises that mapping between an optical waveguide array-optical fiber array auto-aligning physical parameter and a parallel index optimization model is established, and a first objective function and a second objective function are obtained; a maximum evolutional generation is set, input single-mode fiber arrays and output single-mode fiber arrays enter specified spatial positions in a specified direction and attitude according to the regulation of each individual, optical power values of two or more than two waveguide channels are read, recorded and stored, and the Pareto sequence and the crowding distance are calculated; evaluation of each individual in one generation cluster is completed, a next generation cluster is generated by means of intersection, variation and lowliest place elimination, the evolutional generation is accumulated, whether the evolutional generation reaches the maximum evolutional generation or not is determined, if the evolutional generation reaches the maximum evolutional generation, the process is finished; if the evolutional generation does not reach the maximum evolutional generation, the intersection step is returned. According to the invention, the low-loss rapid butt-coupling automation degree and the working efficiency of an optical fiber array-waveguide device-optical fiber array system are effectively improved.

The invention belongs to the technical field of micro-device fabrication and relates to a small-diameter polarization-maintaining fiber and micro-chip fixed-shaft coupling system and method. The coupling system includes an optical platform (11), a three-dimensional adjustment table I (6), a sliding block (8), a guide rail (9), a fixed base (12), a precise three-dimensional butt coupling table (13), a control processing system (19), a microscope III (20), a shaft fixing device (21), a two-dimensional fine adjustment platform (22), and a photoelectric converter (23). According to the technical scheme of the invention, a small-diameter polarization-maintaining fiber can be conveniently coupled to be in butt joint with a micro-chip while the small-diameter polarization-maintaining fiber is accurately controlled in the fixed-shaft manner at the same time. Therefore, the advantages of accurate shaft alignment, convenient operation and simple system are realized.

An optical coupling structure includes a PQR hole emitter having a PQR hole, and an optical fiber whose one side is tapered into the PQR hole. An index-matching solution such as a photo-resist or a photo-resist diluted solution is injected into the PQR hole to adhere the optical fiber and the PQR hole.

The invention discloses a mounting tool of a ship shafting case butt coupling. The mounting tool comprises a frame body and a derrick assembly, wherein the bottom end of the frame body is vertically and fixedly connected to a shaft body through a first permanent magnetic chuck, a guide rail is arranged on the frame body in the X axis direction, the derrick assembly comprises a base capable of moving along the guide rail back and forth and a derrick fixedly connected to the bottom of the base, and a Y-direction hand wheel for adjusting the derrick to move in the Y-axis direction and a Z-direction hand wheel for adjusting the derrick to move in the Z-axis direction are arranged on the base; and a second permanent magnetic chuck is arranged at the bottom end of the derrick to adsorb the coupling, and a camera device used for shooting the real-time position of the coupling is arranged on the derrick. The invention further provides a mounting method of the ship shafting case butt coupling.According to the mounting tool of the ship shafting case butt coupling, the hoisting safety of the coupling is high, besides, centering during mounting of the coupling is simple and accurate, the labor intensity is reduced, the working efficiency is improved, and the production cost is reduced.

The invention discloses a narrow linewidth laser which comprises a passive annular resonant cavity, an FP resonant cavity and a first gain region, the passive annular resonant cavity and the FP resonant cavity are matched to form an M-Z (Mach-Zehnder Interference Structure) composite outer cavity structure, and the M-Z composite outer cavity structure is at least used for providing wavelength selection and narrowing the linewidth of the laser. And the first gain region is arranged on the outer side of the M-Z composite outer cavity structure and is at least used for providing gain for the whole laser. The narrow linewidth laser provided by the embodiment of the invention is simple in structure, high in side mode rejection ratio, narrow in linewidth and high in output power; by further integrating the third gain region, wide-spectrum, low-consumption and fast tuning can be realized, and tuning management is simple; in the prior art, for example, monolithic integration is adopted, butt joint coupling loss of the gain area and the waveguide area and narrow linewidth limitation caused by the butt joint coupling loss can be further avoided, meanwhile, the device can be manufactured through an integrally-formed semiconductor process, and the device is low in cost, higher in stability and reliability and higher in severe environment resistance.

An optical device comprises first, second and third elements fabricated on a common substrate. The first element comprises an active waveguide structure supporting a first optical mode, the second element, fabricated on a planarized top surface of the first element, comprises a passive waveguide structure supporting a second optical mode, and the third element, at least partly butt-coupled to the first element, comprises an intermediate waveguide structure, positioned such that a top surface of the intermediate structure underlies a bottom surface of the passive waveguide structure. If the first optical mode differs from the second optical mode by more than a predetermined amount, a tapered waveguide structure in at least one of the second and third elements facilitates efficient adiabatic transformation between the first optical mode and the second optical mode. Mutual alignments of the first, second and third elements are defined using lithographic alignment marks.

The invention discloses a method for preparing a heptenoic acid cyclopentyl ester product by taking (4R-cis)-6-[(acetoxy)methyl]-2,2-dimethyl-1,3-dioxane-4-tert butyl acetate as an initial raw material, and the product is prepared through steps of hydrolysis, replacement and oxidation. The synthesis step is simple, an intermediate can be subjected to a next reaction without refining and purifying steps, for a butt-coupling reaction, the conventional mild technology condition can replace ultralow temperature reaction condition, superbase with high danger is simultaneously replaced, reaction security is increased, the route total yield is high, and the method is suitable for large-scale industrial production.

The invention relates to an optical communication semiconductor laser and an aluminum-containing quantum well active layer butt joint growth method thereof. The method comprises the following steps: growing an aluminum-free passive waveguide layer on a substrate to complete first epitaxy; removing the aluminum-free passive waveguide layer in a first aluminum-containing quantum well active layer area preset on the primary epitaxial wafer, performing secondary epitaxy, and growing a first aluminum-containing quantum well active layer; and continuously removing the aluminum-free passive waveguidelayer in a preset second aluminum-containing quantum well active layer region on the secondary epitaxial wafer, performing third epitaxy, and growing a second aluminum-containing quantum well activelayer, the aluminum-free passive waveguide layer being spaced between the first aluminum-containing quantum well active layer and the second aluminum-containing quantum well active layer. The epitaxial growth of the aluminum-containing quantum well active layer is carried out on the aluminum-free passive waveguide layer, so that the problem of oxidation of an aluminum-containing material is avoided, and the butt coupling growth quality is improved. And meanwhile, the active layer is made of a high-performance aluminum-containing material, so that the performance of the component can be improved.

The invention provides a photoelectronic integrated chip and a manufacturing method thereof. The photoelectronic integrated chip comprises a gain chip and a silicon optical chip spot-size converter, the gain chip comprises a passive waveguide part and an active waveguide part; a first thin film layer is grown below a passive waveguide region of the passive waveguide part, and a second thin film layer is grown below a quantum well gain region of the active waveguide part; a third thin film layer grows above a silicon waveguide of the silicon optical chip spot size converter; a TE fundamental mode supported by the passive waveguide part is greater than a mode field of a first threshold value; the TE fundamental mode supported by the active waveguide part is greater than a mode field of a second threshold value; the TE fundamental mode supported by the silicon optical chip spot size converter is larger than a mode field of a third threshold value. The problem that in the prior art, the end face coupling tolerance of an integrated light source on a silicon substrate is small through a hybrid integration technology is solved, high-efficiency coupling can be achieved, the butt joint tolerance is greatly increased, the tolerance can meet the precision of an automatic chip mounter, and passive end face butt joint coupling can be achieved.