16 results about "Single mode waveguides" patented technology

The invention relates to a micro-ring resonator based on a multi-circle square structure, the micro-ring resonator comprises a coupling waveguide and a multi-circle square micro-ring resonant cavity, the coupling waveguide comprises an S-bend waveguide, an input waveguide and an output waveguide which are all single-mode waveguides, and the multi-circle square micro-ring resonant cavity comprises a crossed waveguide chain and a multi-mode waveguide section connected with the crossed waveguide chain. The multi-mode waveguide section comprises a multi-mode straight waveguide and a 90-degree multi-mode Euler bending waveguide. By introducing the multi-mode waveguide, the energy distribution of the guided mode on the side wall is reduced, and the transmission loss of the micro-ring resonant cavity is reduced. Through the arrangement of the multi-circle square micro-ring resonant cavity, the length of the micro-ring is increased within a limited size, and the Q value of the multi-circle square micro-ring resonant cavity is improved. By means of the 90-degree multimode Euler bending waveguide, compact 90-degree turning is achieved, generation of a high-order mode is restrained, and meanwhile the micro-ring surrounding area is increased. Therefore, a solution can be provided for the high-performance sensing unit for the integrated micro-ring sensor.

The present disclosure provides a mode spot converter and a preparation method thereof, which are used for directly coupling an optical fiber and a photoelectric detector chip. The mode spot converter comprises a substrate, a ridge waveguide formed on the substrate, and the ridge waveguide comprises a ridge single-mode waveguide, a tapered ridge waveguide and a widened ridge waveguide connected in sequence along a direction parallel to the surface of the substrate. The widened ridge waveguide is used for connecting an optical fiber and matching the mode field of the optical fiber. The tapered ridge waveguide is used for amplifying and concentrating the mode spot of the light wave output by the optical fiber. The ridge single-mode waveguide is used for coupling the light wave after mode spot conversion to the photoelectric detector chip. The mode spot converter improves the coupling efficiency, accuracy and tolerance, and transmission efficiency, greatly reduces the loss of directly coupling a single-mode optical fiber and a ridge single-mode waveguide, and has high compact integration and low packaging cost.

This application provides a method and system for detecting the coupling effect of a Fiber Optic Actuator (FAU). In one example, the FAU coupling effect detection system includes: a C-band laser for outputting a C-band laser signal; a C-band circulator for inputting the C-band laser signal into a designated optical fiber of the FAU when the FAU is coupled to a silicon photonic chip, and inputting the reflected light signal of the C-band laser signal into an optical power meter; wherein a C-band grating is disposed in a single-mode waveguide corresponding to the designated optical fiber in the silicon photonic chip; the reflected light signal of the C-band laser signal is obtained by reflecting the input C-band laser signal through the C-band grating; and the optical power meter is used to measure the optical power of the reflected light signal of the C-band laser signal. Applying this embodiment allows for the detection of the coupling effect between the FAU and the silicon photonic chip without adding an additional loopback optical path.

The invention provides a fiber core alignment welding device of a soft glass active optical fiber, which comprises a first monitoring light source, a second monitoring light source, a wavelength division multiplexer, an optical fiber to be welded, a cladding mode stripper, the soft glass active optical fiber, an optical fiber welding machine, a dichroscope, a light spot analyzer and a power meter, the wavelength of the output first monitoring laser is located in an absorption band of the soft glass active optical fiber; a tail fiber of the second monitoring light source is a single-mode optical fiber, the wavelength for outputting the second monitoring laser is located outside the absorption band of the soft glass active optical fiber, and a fiber core of the soft glass active optical fiber is a single-mode waveguide for the second monitoring laser; the dichroscope is used for splitting the first monitoring laser and the second monitoring laser output by the soft glass active optical fiber; and the power meter is used for measuring the power of the first monitoring laser. The invention further provides a fiber core alignment welding parameter optimization method of the soft glass active optical fiber.

The application belongs to the field of optoelectronic technology and particularly relates to an ultra-wideband optical directional coupler, which comprises three single-mode waveguides arranged in parallel at intervals and having the same width, contains straight waveguides and curved waveguides, and one curved waveguide is arranged between two adjacent straight waveguides; straight waveguide ports supporting edge state modes at both ends of a waveguide structure composed of the three single-mode waveguides are respectively used as a coupler input port and an output port; the curved waveguide is a modulation waveguide, and the center distance between the modulation waveguide and one of the straight waveguides adjacent to the modulation waveguide is characterized by a modulation function which changes uniformly and slowly in the propagation direction, the tangent of the function at both ends of the device is parallel to the straight waveguide, and the change relation involves parameters such as the total length of the device, the modulation amplitude of the bending in the direction perpendicular to the propagation direction, and the position of the input port end in the propagation direction. The application greatly improves the response bandwidth of the device.

The application provides an optical multimode interference coupler. The optical multimode interference coupler of the application directly connects a transmission waveguide with a slit structure and a bar-shaped multimode waveguide at an interface, and based on multimode excitation principle and self-imaging principle of the multimode interference coupler, the optical signal in the bar-shaped multimode waveguide is simultaneously split and the waveguide structure is converted at the interface in the slit single-mode waveguide, without using a traditional tapered bar-slit waveguide conversion structure, so that the length of the electronic component is effectively reduced and the integration of the component is improved. The application realizes that the input optical signal can be directly and evenly divided into two slit waveguides from the bar-shaped waveguide, without using a traditional combination structure of splitting light first and then converting. The device has the advantages of small size, low loss, high bandwidth and the like.

The invention provides an integrated photon neural mimicry computing chip based on mode division multiplexing, which comprises a multi-mode photon synapse array which comprises N * N multi-mode photon synapses arranged in an array mode, two adjacent multi-mode photon synapses arranged along a row, a first multi-mode photon synapse and a second multi-mode photon synapse arranged along a column, single-mode waveguides of the multi-mode photon synapses are connected, and single-mode waveguides of the multi-mode photon synapses are connected with single-mode waveguides of the multi-mode photon synapses; multimode waveguides of the second to Nth multimode photon synapses arranged along the column are connected; and N multi-mode photonic neurons connected with the last multi-mode waveguide of the corresponding column. According to the invention, a brand new mode division multiplexing integrated photon neural mimicry computing architecture is provided, the limitation of space stacking of a traditional single-mode device is broken through, and the optical parallel computing and neuron activation capability is really expanded by using a mode division multiplexing technology.

This invention discloses a method for measuring the coupling coefficient based on an identical waveguide array, belonging to the field of measurement and testing of optical waveguide properties. The method includes: constructing a measurement system for the coupling coefficient of the waveguide array; testing the evolution results of the waveguide array; and recalculating the coupling coefficient through simulation experiments. Based on the consistency between the evolution process of photons in the waveguide array and continuous-time quantum walks, this invention uses an identical single-mode waveguide array, relies on the physical model of continuous-time quantum walks, and measures the output probability amplitude at different evolution lengths. The simulation and test results are evaluated using the least squares method to finally obtain the waveguide coupling coefficient. This method has low requirements for experimental equipment, low workload, and requires less sample width; it can accurately predict and analyze the evolution of light in the waveguide array.

This invention belongs to the field of microwave technology, specifically providing a high-order mode suppression transition structure based on two equal-power excitation odd-symmetric electric fields to achieve single-mode transition between a rectangular single-mode waveguide and a rectangular overmode waveguide. It includes a rectangular waveguide power divider, a rectangular connecting waveguide, and a rectangular overmode waveguide. The two rectangular connecting waveguides connect the outputs of the two equal-power-dividing rectangular waveguide power dividers to the rectangular overmode waveguide, with their wide-side centers located at 1 / 3 and 2 / 3 of the wide side of the rectangular overmode waveguide, respectively. The rectangular overmode waveguide TE is in-phase excited. 30 At the odd-symmetric location of the mode electric field, the TE in the rectangular overmode waveguide is realized. 30 and TE k0 Suppression of modulo (k is an even number greater than or equal to 2). Its advantage is that it solves the problem of traditional transition mode (TE) not being effectively suppressed. 30 The problem of the module, while realizing the TE k0 Suppression of modulo (k is an even number greater than or equal to 2) has the advantages of good performance, low cost, small size, light weight and easy implementation, and has extremely high application value.

The application discloses a hydrogen concentration detection sensor and a hydrogen concentration detection method, wherein the sensor comprises a substrate, a waveguide core layer arranged on the substrate, and a cladding layer covering the waveguide core layer; a subwavelength grating structure is formed in the waveguide core layer, the subwavelength grating structure supports modes and modes and can generate bimode interference, the material of the waveguide core layer has a positive thermal-optical coefficient, single-mode waveguides are coupled to two ends of the subwavelength grating structure, an asymmetric coupling structure is formed between the single-mode waveguides and the subwavelength grating structure, and the asymmetric coupling structure is used for exciting two modes of modes and modes; the material of the cladding layer has a negative thermal-optical coefficient, the surface of the cladding layer is decorated with a hydrogen-sensitive material layer, and the hydrogen-sensitive material layer can catalyze an exothermic oxidation reaction with hydrogen. The application converts the hydrogen concentration change into the shift of an interference peak wavelength, compared with a traditional sensor which only depends on a single physical effect, the sensitivity is greatly improved, the sensor is easy to be integrated on a chip, does not need external electric driving, and is intrinsically safe and reliable.

The invention relates to an on-chip integrated multi-frequency narrow-linewidth semiconductor laser optical pulse device and a preparation method thereof. The device comprises a silicon substrate; the laser signal processing device is positioned on the silicon substrate and is processed and prepared through a semiconductor technology; the laser signal processing device comprises a silicon-based waveguide grating, a silicon-based optical switch structure, a silicon-based frequency shifter structure and a silicon-based beam combining structure which are connected in sequence; the single-mode output semiconductor laser is processed and prepared through a semiconductor technology and connected to the silicon substrate through heterogeneous bonding, the waveguide structure is a single-mode waveguide, the semiconductor laser is connected to the silicon substrate through heterogeneous bonding, and the semiconductor laser is coupled with the silicon-based waveguide grating through an end face. The method comprises the following steps: preparing a laser signal processing device; processing and preparing a semiconductor laser through a semiconductor technology; the two devices are placed on a silicon substrate. According to the invention, external elements are not needed, the loss of light in the transmission process is small, and the process complexity is not improved in the packaging process.

The application discloses a kind of full solid-state optical biological probes based on optical phased array principle.The probe includes probe base and probe arm two parts, two parts are the full solid-state structure processed on the same silicon optical chip;The probe base includes input optical coupler, 1×n optical switch, n optical beam splitting modulation array and multiple electrical interfaces;The probe arm contains multiple sensing electrodes and n optical antenna array;Each optical structure of the probe is connected by single-mode waveguide or multiple single-mode waveguide, and each electrical structure is connected by copper metal layer wiring.The application can form quasi-Bessel beam under the condition that the radiation light of the optical antenna array meets the initial amplitude and initial phase condition, the quasi-Bessel beam has strong penetration in biological tissue, and two-dimensional deflection of pointing angle can be realized by adjusting phase, deflection speed is fast, and spatial resolution is high.

An optical modulator that uses adiabatic tapers to change the width of the waveguides between multimode waveguides and single mode waveguides on a low-loss, e.g. thin-film lithium niobate, electro-optic platform. The architecture enables the utilization of the fundamental mode of multimode wide optical waveguides that have lower optical propagation loss without sacrificing the benefit of the signal integrity and ease of control of single mode operation.

The embodiment of the application discloses a waveguide assembly, an integrated chip and a laser radar. The waveguide assembly comprises a plurality of single-mode waveguides which are distributed at intervals, and the effective refractive index of at least one single-mode waveguide is different from the effective refractive index of another adjacent single-mode waveguide. The application can make the offset echo laser signal reach other single-mode waveguides, and improve the receiving rate of the offset echo laser signal. Compared with receiving the offset echo laser signal by means of a large width of a multimode waveguide, there is no problem of triggering the high-order mode of the multimode waveguide, and the echo laser signal has the advantage of higher receiving rate. In addition, the effective refractive indexes of the two adjacent single-mode waveguides are different, which can break the phase matching condition between the two adjacent single-mode waveguides, thereby suppressing the coupling between the two adjacent single-mode waveguides, reducing the crosstalk, making the distance between the two adjacent single-mode waveguides smaller, realizing the size reduction of the waveguide assembly, saving the chip area, improving the integration, and reducing the cost.