390 results about "Coupling loss" patented technology

A gas detection method capable of solving the problem with respect to the operation at normal temperature that was impossible so far in the existent catalyst type sensor and detection with high sensitivity that was impossible by the light absorption type sensor. A multi-layered film formed of a first layer adsorbing a specified gas and a second layer having less adsorption are utilized as a detection film, and the detection film is disposed in the direction perpendicular to the optical channel and optically detects the change of stress caused in the detection film by gas adsorption as coupling loss. Alternatively, the stress generated in the detection film caused by gas adsorption is electrically detected by a piezoelectric element or capacitance element.

Provided is an optical connection apparatus for a parallel optical interconnect module and a parallel optical interconnect module using the same for reducing a coupling loss generated due to an alignment error when coupled with an optical fiber, comprising: a 2D reflector in a prism shape and having at least two rows of cylinder type lens attached thereto; a 2D optical waveguide having at least two layers of core arrays; at least two rows of 2D optical benches; and a 2D ferrule capable of loading at least two layers of optical fibers so as to facilitate the fixing of the 2D optical waveguide for optical interconnection.

In an optical module, a package includes an array of first optical elements and at least one first positioning member. A microlens array plate including microlenses is fixed to the package, so that each of the microlenses corresponds to one of the first optical elements. An optical array connector mounts second optical elements thereon. The optical array connector has a light path bending portion for bending light paths of the second optical elements and at least one second positioning member. The optical array connector abuts against the package by aligning the second positioning member to the first positioning member so that each of the first optical elements corresponds to one of the second optical elements, A clamping member clamps the optical, array connector to the package.

The invention relates to an optical component (1) comprising a combination of optical waveguide elements for modifying the spot size of a mode of an electromagnetic field propagated by an optical waveguide element, the optical waveguide elements being formed on a substrate. The object of the present invention is to provide a mode coupler with low coupling loss that is easy to manufacture and process tolerant. The problem is solved in that the optical component further comprises a) a first section (10), comprising a first optical waveguide element (11) adapted to sustain at least one mode of the electromagnetic field, b) a second section (20) comprising at least two cooperating optical waveguide elements (21, 22), each of said at least two cooperating optical waveguide elements comprising at least one waveguide segment, said at least two cooperating optical waveguide elements being optically connected to said first optical waveguide element of said first section; wherein said cooperating optical waveguide elements (21, 22) of said second section (20) are adapted to maintain optical coupling between said optical waveguide elements to ensure that said at least one mode of the electromagnetic field is sustained by said at least two cooperating optical waveguide elements in cooperation. Preferably, the waveguides of the first and/or second sections are tapered according to a cosine function or to a 5^th or 7^th order polynomial. An advantage of an optical component according to the invention is that it provides a mode size converter that is relatively simple to manufacture in that it requires no extra process steps. A further advantage is that it is readily suitable for integration with other optical circuitry on a common substrate. The invention may be used in optical communication systems (e.g. systems employing WDM) where coupling of light between integrated optical circuits and optical fibres are needed.

The invention discloses a implementing method and device for multi-carrier power sharing. The inventive method includes steps of: generating output power modulating instruction according to test distance between user terminal and base station, or coupling loss, or available signal power intensity of base station; sending the mentioned output power modulating instruction to base station, so as to instruct base station to distribute output power of multi-carrier for sharing according to the instruction. The invention dynamically modulates output power of carrier, improves power sharing, equivalently enhances coverage, reduces cost through scheduling of base station according to distance between user terminal and base station, coupling loss and intensity of available signal power received by user terminal, without changes on main hardware such as power amplifier.

The invention discloses a method for analyzing and predicting noise outside a car, which aims at overcoming the problem that the noise outside the car is difficult to be predicted in the developing and designing stage of the car product. The method comprises the steps of: 1) establishing an SEA model of the car body structure: dividing the car body into a plurality of structural sub-systems, and connecting all structural sub-systems according to the correlations; 2) establishing an SEA model for an external acoustic cavity of the car: establishing SEA models for the external acoustic cavitiesof the car at two sides and on the external surface of the car body in the SEA model of the car body; 3) determining the SEA parameter of the car body and the external acoustic cavity sub-system of the car: determining the mode density of each sub-system, determining the internal loss factor of each sub-system, and determining the coupling loss factor of all sub-systems; 4) determining the external excitation energy of the car body: determining the acoustic excitation energy of an engine cabin, determining the excitation energy of suspended engine, determining the excitation energy of unevenness of the road surface on the car body, and determining the excitation energy of the wind pressure on the external surface of the car body; and 5) analyzing and predicting the noise outside the car.

The invention provides a laser cleaning system for a rubber module, and the laser cleaning system comprises a laser cleaning head and a laser control system, wherein the laser cleaning head comprises a laser device and a beam expander, a scanning galvanometer is arranged in the output light direction of the beam expander, a focusing lens is arranged on the reflecting light path of the scanning galvanometer, and the light path output end of the focusing lens is used for cleaning articles; the laser device comprises a total reflector, an acousto-optic Q-switch, a semiconductor pumping module and an output mirror which are sequentially arranged on the light path; and the light-emitting switch of the laser device, the Q-switching drive module of the acousto-optic Q-switch, the power supply of the semiconductor pumping module, and the drive unit of the scanning galvanometer are controlled by a laser control system respectively. According to the invention, the semiconductor pumping solid pulse laser device is adopted and integrated on a cleaning machining head, the output power of laser is increased by means of acousto-optic Q-switching, and the coupling loss caused by optical fibre transmission is avoided, so that portable-type machining in a handheld mode or a manipulator clamping mode can be realized, and efficient cleaning for the rubber module can be finished.

A laser diode is fixed to a light source support substrate and a first surface of a slider substrate is fixed to a second surface of the light source support substrate; therefore, the slider substrate and the laser diode are kept in a fixed positional relation Since the laser diode faces a light entrance face of a core, long-distance propagation of light as in the conventional technology does not occur, and light emitted from, a light emitting element is guided well to a medium-facing surface, while permitting some mounting error and coupling loss of light A spot size w of a light intensity distribution along the X-axis in the XY plane including an incident-light centroid position on the light entrance face is set larger than a thickness of the core, whereby variation in incidence efficiency is well suppressed against positional deviation.

The invention discloses an optoelectronic hybrid integration sensor device of sulfureted hydrogen gas concentration, which has the characteristics: laser light led out from a laser (1) penetrates through a lens (3) via a polarizer (2), an optical fiber (4) transmits focused polarized light into a gas box (13), the coupling of the optical fiber with a wave guide is realized on an input coupling element (12), the coupled light enters a Mach-Zehnder wave guide interferometer (14), branch wave guides (5 and 19) are respectively connected with a reference arm wave guide (15) and a signal arm wave guide (6) in parallel, the end surface sizes of the two wave guides are determined by mode field matching so as to reduce coupling loss and improve coupling efficiency, a wave guide phase modulator (16) adopts a lumped type wave guide phase modulator structure and is arranged between the reference arm wave guide and the signal arm wave guide, the light interfered by the Mach-Zehnder wave guide interferometer is coupled out of the gas box by an output coupling element (18) to enter a photoelectric signal transforming and processing system and then is led into a photoelectric diode (9) by a lens (7) and an analyzer (8) via the optical fiber, after that, the light intensity is transformed into electric signals to be inputted to a micro signal processor (10), and finally the concentration value of the sulfureted hydrogen gas is obtained by calculation.

The invention provides a near-field antenna apparatus for a three-segment type metal rear cover. The metal rear cover includes a metal frame and a metal backshell, wherein gaps are formed in the joint between the upper and lower ends of the metal frame and the metal backshell, so that a first segment, a second segment and a third segment are formed; the first segment is formed by the upper end of the metal frame and is used as a radiator; the second segment is formed by the middle part of the metal frame and the metal backshell; the third segment is formed by the lower end of the metal frame; the metal rear cover also includes a near-field antenna and a radio frequency antenna which are in feeding connection with the first segment; and the near-field antenna and the radio frequency antenna are set in a non-common ground mode. The near-field antenna apparatus for a three-segment type metal rear cover abandons a traditional mode for adding ferrite in a power supply coil, thus saving the cost; and the profile of a terminal has no demand for an extra gap opening design, so that the product is more beautiful and the coupling loss caused by coupled feeding is avoided; and at the same time, the antenna structure designed for a special three-segment type metal rear cover structure enables the antenna to have an efficient structural form in different forms of communication terminals.

A coupling waveguide is interconnected between a launching fiber and a receiving fiber to reduce coupling loss. The coupling waveguide includes an integrally formed graded index lens having a non-parabolic refractive index profile. The graded index lens receives as an input a coupling mode field of an optical signal launched by the launching fiber and transforms the coupling mode field into a transverse spatial distribution matching a corresponding coupling mode field of the receiving fiber.

An optical waveguide element capable of being coupled with optical fibers at high coupling efficiency is to be provided. Also an optical waveguide element manufacturing method permitting accurate production of such optical waveguide elements is to be provided. The optical waveguide element is provided with a buffer layer formed over a monocrystalline substrate and an optical waveguide layer formed over the buffer layer, and a recess is formed in the buffer layer along the lengthwise direction of the monocrystalline substrate. The optical waveguide layer is provided to fit into this recess to form a channel optical waveguide. Over the upper face of the optical waveguide layer on the light incidence side and the light emission side, a cladding layer whose refractive index is smaller than that of the optical waveguide layer and whose thickness increases towards the end face(s) in a flared shape is provided in the same width as that of the monocrystalline substrate. By providing the cladding layer whose refractive index is smaller than that of the optical waveguide layer, it is made possible to expand the mode field diameter and substantially reduce the coupling loss between the optical fiber and the optical waveguide element. Further by increasing the thickness of the cladding layer in a flared shape toward the end face(s), it is made possible to gradually compress the mode field diameter and to reduce the optical propagation loss within the optical waveguide.

An optical fiber coupling part capable of reducing coupling loss while maintaining a large operating distance, and having a good module assembling property. AT least one GRIN lens having numerical aperture NA that is larger than numerical aperture NAs of a light-emitting source (such as a semiconductor laser) is fusion-spliced with one end of the optical fiber. All lights emitted from the light-emitting source can enter the GRIN lens, and the loss of the light can thereby be reduced. In addition, a second GRIN lens having numerical aperture NA₂ is fusion-spliced with one end of the optical fiber having numerical aperture NA_f, and further a first GRIN lens having numerical aperture NA₁, which is larger than numerical aperture NA₂, is fusion-spliced with the other end of the second GRIN lens. Thereby, the light emitted from the light-emitting source can efficiently enter the optical fiber, and loss of the light can thereby be reduced. In this case, the formula expressed by NA_f≦NA₂<NA_s≦NA₁ is desirable.

A monolithically integrated wavelength switchable laser comprises three coupled Fabry-Perot cavities. The length and consequently the free spectral range of the first cavity are designed such that the resonant peaks correspond substantially to a set of discrete operating wavelengths separated by a constant channel spacing. The second cavity has a slightly different length so that only one resonant peak coincides with one of the resonant peaks of the first cavity over the spectral window of the material gain. The lasing action occurs at the common resonant wavelength. The two cavities are coupled through a third short cavity that produces a certain coupling loss and phase relationship between the first and the second cavities in order to achieve an optimal mode selectivity of the combined cavity laser. In operation, both the first and the second cavities are forward biased to provide optical gains for the laser action. The second cavity is tuned by varying the refractive index of at least a portion of the waveguide within the cavity through an electrical means, resulting in wavelength switching of the laser among the set of discrete operating wavelengths as determined by the first cavity.

The present invention relates to a parallel optical interconnection module for transmitting an optical signal over an optical fiber and receiving an optical signal from the optical fiber. According to the present invention, a reflection surface is formed at the end of the optical waveguide forming a core so that the path of light can be exactly changed and is focused. A light source/photodetector is buried within a trench using the silicon optical bench and an optical waveguide is manually aligned on the surface of the silicon optical bench, so that alignment error between the light source/photodetector and the optical waveguide can be minimized. A ferrule into which the optical waveguide is inserted is fixed to an adaptor so that alignment error between the optical waveguide and the light source/photodetector is minimized. Therefore, the present invention can minimize the coupling loss in the process during which the optical signal is transmitted to increase the optical output. Further, the present invention allows easy optical interconnection by means of a manual alignment and can increase the productivity.

The invention relates to a device and method for stabilizing any bias point of an external modulator, wherein the device comprises a laser, a variable optical attenuator, a lithium niobate modulator, an optical coupler, a signal source, a driving amplifier and a feedback control part; the device can be used for collecting a feedback signal and setting a bias voltage via a data acquisition board in the feedback control part so as to stabilize any bias point. The device and the method of the invention solve the problem that an optimal bias point of the modulator is drifted and an output signal is degraded because of changes of factors such as time, environment temperature, laser luminous power, and optical fiber inserting and coupling loss. The device and the method can be applied in the optical communication field, especially high-speed long distance communication in the optical communication field.

The invention relates to the technical field of photonic devices, in particular to a method for manufacturing a grating coupler with an adjustable refractive index. The method is characterized in that a grating groove is of a sub-wavelength structure with different transverse duty ratios, and a grating has different duty ratios fy in the transverse direction, namely, the direction y, at different positions x in the longitudinal direction, namely, the direction x; the value of the duty ratio fx of the grating in the longitudinal direction is a fixed value between zero and one; the transverse duty ratio fy of the sub-wavelength structure forming the grating grooves at different positions x in the longitudinal direction is determined by leakage factor distribution alpha (x) needed by output Guassian field distribution G (x). The grating coupler of the structure can effectively reduce coupling losses in the optical fiber and waveguide coupling process.

A tapered waveguide optical mode transformer (20) includes a tapered core formed on a planar substrate structure (16). To vertically taper the core (21), steps (22) are etched into the top surface of the core. The steps have depths and lengths along the optical axis of tapered waveguide that are selected to transform the optical mode characteristics of a desired optical fiber to the optical mode characteristics of a desired planar waveguide. The core can also be tapered horizontally to form a 2-D tapered waveguide. The tapered waveguide can be integrally included in planar lightwave circuits (PLCs) to reduce light coupling losses between optical fibers and the PLC waveguides.

An optical device which reduces coupling loss while improving practicality is provided. A multi-core fiber coupling device is an optical device which couples a multi-core fiber to single core fibers, and includes a first optical system which is located on optical axes of a plurality of beams emitted from the multi-core fiber, and which makes the optical axes of the respective beams non-parallel to each other, thereby making the beams in a state of being separated from each other, and a second optical system S2 which makes the optical axes of the plurality of beams in a state of being non-parallel to each other on the side of the first optical system, in a state of being approximately parallel to each other.

The invention provides a manufacturing method for an optical fiber array for optical coupling and a coupling method and device.The manufacturing method for the optical fiber array comprises the following steps that naked fibers of the optical fiber array are pressed into a V-shaped groove, the tail end of a bare wire is aligned to the tail end of the V-shaped groove, the bare wire pressed into the V-shaped groove is covered with cover glass to be fixed, the cover glass does not cover the tail end of the V-shaped groove, the distance between the tail end of the cover glass and the tail end of the V-shaped groove is larger than the depth distance between steps of a silicon optical chip coupled to the optical fiber array, and the tail end of the optical fiber array is supported under the V-shaped groove to form one step; an adhesive is dispensed on the portion, not covered with the cover glass, of the bare wire so as to fix the bare wire; a filler aligned to the tail end of the V-shaped groove is applied to the step at the tail end of the optical fiber array; the end face of the optical fiber array is polished, the filler is removed after polishing is performed, and the step is exposed.By adopting the step-type optical fiber array, the problem that coupling losses are large due to the fact that a common optical fiber array is far away from the coupling end face of the chip is solved.