35 results about "Single mode waveguides" patented technology

An electro-optic modulator includes a light-splitting element, a light-combining element, two waveguide arms, and a modulation electrode. The two waveguide arms are connected between the light-splitting element and the light-combining element, and each waveguide arm includes a first single-mode waveguide portion, a first coupling portion, a multi-mode waveguide portion, a second coupling portion, and a second single-mode waveguide portion, wherein the width of either of the first single-mode waveguide portion and the second single-mode waveguide portion is smaller than the width of the multi-mode waveguide portion; the first coupling portion is configured to enable light to be coupled into the multi-mode waveguide portion from the first single-mode waveguide portion, and the second coupling portion is configured to enable light to be coupled into the second single-mode waveguide portion from the multi-mode waveguide portion; and the modulation electrode is configured to apply a modulation voltage to the multi-mode waveguide portion of the two waveguide arms.

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.

An optical device includes a transition unit in which a first waveguide and a second waveguide are disposed in an overlapped manner such that a magnitude relationship of an effective refractive index between the vertical modes propagating the first waveguide and the vertical modes propagating the second waveguide is inverted at the positions of input and output. The transition unit allows, at the input, the second waveguide to be a single mode waveguide and allows, at the output, the second waveguide to be a multi-mode waveguide through which TM0 light in the maximum vertical mode and light in a higher-order mode propagate. The optical device includes a removing unit that allows the second waveguide to be a single mode waveguide through which the TM0 light propagates by removing the light in the higher-order mode from the light received from the transition unit.

A photonics device is described. The photonics device includes a waveguide and an electrode. The waveguide configured to transmit an optical signal having a wavelength less than 1100 nanometers and is a single mode waveguide. The waveguide includes electro-optic material(s). The electrode is proximate to a portion of the waveguide and configured to carry an electrode signal for modulating the optical signal. The photonics device is configured to be coupled with at least one multimode fiber. The multimode fiber(s) is configured to transmit a plurality of modes.

This invention discloses a highly integrated mode filter and its fabrication method, comprising a silicon substrate, a lower cladding layer, and an upper cladding layer, with a core layer between the upper and lower cladding layers. The core layer includes an input waveguide, a first mode routing region for filtering out the fundamental mode and converting higher-order modes into the fundamental mode for output, a single-mode region for transmitting the single-mode waveguide in the first mode routing region, a second mode routing region for converting the fundamental mode transmitted in the single-mode region into higher-order modes, and an output waveguide. The waveguide inputs from the incident port and propagates through the left-side first mode routing region, where the fundamental mode TE0 is filtered out by the curved waveguide; the higher-order mode TE1 is converted into the fundamental mode TE0 through the left-side first mode routing region, propagates through the central straight waveguide to the right-side second mode routing region, is converted into the higher-order mode TE1, and then outputs from the output port via the output waveguide. This mode filter is simple to fabricate, small in size, has excellent performance, low processing cost, high mode conversion rate, and strong anti-crosstalk capability. It selectively filters out some modes of light, improving the quality and stability of optical communication.

The invention relates to an optical waveguide sensor based on a cascaded phase-shift uniform Bragg grating, and the sensor comprises the cascaded phase-shift uniform Bragg grating which is provided with an input single-mode waveguide and an output single-mode waveguide. A plurality of phase-shift uniform Bragg grating units are arranged between the input single-mode waveguide and the output single-mode waveguide; the phase shift uniform Bragg grating unit comprises a phase shift cavity and periodic refractive index modulation structures symmetrically arranged on the two sides of the phase shift cavity. The optical waveguide structure of the phase shift uniform Bragg grating is not covered by an upper cladding. According to the invention, through the coupling design of cascaded multi-stage harmonic peaks, the quality factor and the detection precision are greatly improved, and the wavelength detection range is widened at the same time. The design without the upper cladding layer is combined with the single-step photoetching etching process, so that the complex process of growing the upper cladding layer or overlaying a sensing window is thoroughly omitted, and the manufacturing cost and the process complexity are greatly reduced.

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.

The invention provides an optical multimode interference coupler. According to the optical multi-mode interference coupler, the transmission waveguide of the slit structure is directly connected with the interface of the strip-shaped multi-mode waveguide, and based on the multi-mode excitation principle and the self-imaging principle of the multi-mode interference coupler, optical signals in the strip-shaped multi-mode waveguide are located at the interface in the slit single-mode waveguide; light splitting in the waveguide and transformation of a waveguide structure are completed at the same time, a traditional gradual deformation strip slit waveguide conversion structure does not need to be used, the length of an electronic component is effectively reduced, and the integration level of the device is improved. According to the invention, an input optical signal can be directly and equally divided into the two slit waveguides from the strip-shaped waveguide, and a traditional combined structure of first light splitting and then conversion is not needed. And the device has the advantages of small size, low loss, high bandwidth and the like.

This invention relates to a dispersion-compensated ring reflector and its fabrication method. It includes a substrate, a silicon waveguide core layer disposed on the substrate, and a first 1×2 multimode interferometer, a first curved tapered waveguide, a second curved tapered waveguide, a first mode converter, a second mode converter, and a first coupling waveguide disposed on the silicon waveguide core layer. The first 1×2 multimode interferometer has one port at its first end and two ports at its second end. The port at the first end is connected to the incident and exit waveguide cross-sections via a first single-mode waveguide. The two ports at the second end are connected to the inputs of the first and second mode converters via the first and second curved tapered waveguides, respectively. The outputs of the first and second mode converters are connected via the first coupling waveguide. The device provided by this invention is adaptable to various material platforms and has good integration with other devices.

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.

This invention relates to the field of micro-nano optoelectronic device technology, specifically to a multi-stage end-face coupler for interconnecting optical fibers and on-chip photonic integrated devices, comprising a 3×2 multimode interference coupler, a connecting single-mode waveguide, and a 2×1 multimode interference coupler; the 3×2 multimode interference coupler includes three input tapered waveguides, a first multimode waveguide, and a dual-output tapered waveguide connected in sequence; the 2×1 multimode interference coupler includes a dual-input tapered waveguide, a second multimode waveguide, a single-output tapered waveguide, and a single-mode waveguide connected in sequence; the middle input tapered waveguide and the side input tapered waveguides are symmetrically distributed along the optical axis, and the first and second multimode waveguides include an interference region and a transition region, the width of which narrows along the direction of light propagation; this invention can reduce the transmission loss of the end-face coupler, increase the alignment tolerance, and reduce the fabrication difficulty.

The invention discloses an ultra-wideband compact calculation spectrometer structure of an electric tuning single-mode spiral waveguide, and belongs to the technical field of photonic devices and integration, the spectrometer structure is constructed on a silicon platform on an insulating substrate, and the spectrometer structure sequentially comprises a resistive layer, an upper cladding, a waveguide layer, a lower cladding and a substrate layer from top to bottom; the waveguide layer comprises an input waveguide, a spiral waveguide and an output waveguide; the input waveguide and the output waveguide are both single-mode waveguides; the spiral waveguide is a single-mode spiral waveguide; the input waveguide and the output waveguide are both connected with the spiral waveguide through a bent waveguide. The ultra-wideband compact calculation spectrometer structure of the electric tuning single-mode spiral waveguide has the advantages of being large in broadband, high in resolution, small in size, few in physical channel, compatible with a standard tape-out process and the like.

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 discloses a TM mode polarizer based on a curved narrow waveguide, which comprises a single-mode input waveguide, an input end conversion waveguide, a curved narrow waveguide, an output end conversion waveguide and a single-mode output waveguide along the light transmission direction. The input light is first converted into the mode supported by the narrow waveguide by the input end conversion waveguide, then the input TE mode is leaked and the input TM mode is passed by reasonably selecting the bending radius and width of the curved narrow waveguide, and finally the TM mode supported by the single-mode waveguide is converted by the output end conversion waveguide, so that the polarizer function of filtering the TE mode and passing the TM mode is realized. The application comprises, in the direction perpendicular to the light transmission plane, an upper cladding layer, a core layer, a buried oxygen layer and a substrate in sequence. The application can realize a high-performance TM mode polarizer in a large optical bandwidth due to the wavelength-insensitive structure, and has important practical application value in the fields of on-chip optical communication, optical sensing and spectroscopy.

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 a silicon-based integrated multimode optical switch and an optical channel switching method. The optical switch comprises an arbitrary mode-dual mode conversion module, a first-order mode demultiplexing module and a high-order mode multiplexing module, wherein the arbitrary mode-dual mode conversion module is formed by sequentially connecting a mode separation unit, a thermal optical phase shift unit and a mode combination unit through single-mode waveguides; the first-order mode demultiplexing module is used for signal routing; and the high-order mode multiplexing module is used for recovering routing signals to a required high-order mode. The arbitrary mode-dual mode conversion module, the first-order mode demultiplexing module and the high-order mode multiplexing module are sequentially connected through matched waveguides; wherein the mode separation unit is composed of three-core coupling waveguides, the middle is a multi-mode waveguide, and the two sides are single-mode waveguides; the mode combination unit is a Y-shaped branch waveguide assisted by a sub-wavelength grating, and the first-order mode demultiplexing module and the high-order mode multiplexing module are each composed of a dual-core (a multi-mode waveguide and a single-mode waveguide) coupling waveguide. The optical switch architecture has the advantages of compact structure, high expansibility, low loss, low manufacturing difficulty, relatively low price and the like.

The invention relates to a waveguide coupling device based on mode splitting and phase equalization, and the device comprises a receiving unit which is used for receiving an incident light beam emitted by an external light source, and comprises a multi-mode receiving waveguide; the mode splitting unit comprises a mode splitter and a single-mode waveguide, one end of the mode splitter is connected with the multimode receiving waveguide, and the other end of the mode splitter is connected with the single-mode waveguide; the number of the single-mode waveguides is N, and N is greater than or equal to 2; the phase equalization unit comprises a phase equalizer, the phase equalizer comprises a phase modulation waveguide, and the phase modulation waveguide is connected with the single-mode waveguides so as to control the waveguide light field phase of each single-mode waveguide; and the number of the phase modulation waveguides is not less than that of the single-mode waveguides. A lens system does not need to be arranged, the size is reduced, and the installation space is effectively saved; secondly, an additional mode field converter does not need to be arranged on the laser chip, so that the requirement on the laser chip is reduced; and moreover, the tolerance to spatial displacement is relatively large.

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.

The present invention discloses a method for preparing a stepped waveguide microcavity refractive index sensor, comprising the following steps: (1) using femtosecond laser writing technology to write a straight single-mode waveguide in a transparent substrate material; and (2) using micromachining technology to prepare a stepped microcavity on one side of the waveguide region. The stepped microcavity structure consists of two rectangular microcavities of different lengths and widths, the length directions of the two microcavities being along the waveguide transmission direction, and the two rectangular cross-sections perpendicular to the waveguide transmission direction each covering a portion of the waveguide mode field, while the sum of the two rectangular cross-sections does not cover the entire waveguide mode field. Compared with existing waveguide microcavity interferometric sensors, this method can overcome the FSR limitation on the refractive index detection range, thereby accurately reading the actual refractive index value of the liquid within a larger refractive index variation range.

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.

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 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 discloses a biomass aerosol on-chip integrated capture platform and device and a preparation method thereof, and the biomass aerosol on-chip integrated capture platform comprises a millimeter-level PDMS main chip, a particle capture cavity located in the PDMS main chip, and a first waveguide structure and a second waveguide structure which are symmetrically arranged at the two sides of the particle capture cavity and propagate oppositely, the first light inlet window and the second light inlet window are used for coupling laser beams to the first waveguide structure and the second waveguide structure respectively; the first waveguide structure and the second waveguide structure are single-mode waveguides which are directly written on the PDMS main chip through femtosecond laser and propagate in opposite directions, and one end, close to the particle capturing cavity, of each single-mode waveguide has a laser beam gathering function. According to the invention, in millimeter-level PDMS, two beams of waveguide output intersect in air to form a stable three-dimensional light potential well, so that stable capture of biomass aerosol, on-chip integration of a capture platform and system miniaturization are realized, the integration level is high, and the structure is compact.

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 invention discloses an ion implantation type lithium niobate electro-optical modulator and a preparation method thereof, and relates to the technical field of integrated photonics. Comprising a thin film lithium niobate substrate, a ridge-type widening waveguide area, an ion implantation type grating arranged on the ridge-type widening waveguide area, a ridge-type single-mode waveguide area, a conical gradual change waveguide area, a 1 * 2 Mach-Zehnder structure light beam splitter, a passive bias waveguide area and a heating electrode arranged over the passive bias waveguide area. According to the lithium niobate electro-optical modulator provided by the invention, the modulation depth of the lithium niobate electro-optical modulator is enhanced by integrating the ion implantation type grating, the passive bias waveguide and the heating electrode, and the wavelength tuning range of the modulator is expanded; the optical modulator is suitable for high-density photon chips, and meets the multi-scene requirements of high-speed communication, quantum sensing, laser radar and the like.

A 2×2 coupler is disclosed. In one aspect, the 2×2 coupler includes a first stage configured as a mode multiplexer. The mode multiplexer includes two input waveguides that transition asymmetrically along a propagation axis of the 2×2 coupler so that an optical signal input into either of the two input waveguides traverses into the input waveguide that transitions from a single mode waveguide to a multimode waveguide. The 2×2 coupler also includes a second stage configured as a multimode splitter. The multimode splitter includes two single mode output waveguides and a multimode waveguide arranged in communication with the multimode waveguide of the mode multiplexer. The output waveguides and the multimode waveguide transition symmetrically along the propagation axis so that the optical signal traversing in the multimode waveguide of the mode multiplexer is received by the multimode waveguide of the multimode splitter and split into the two single mode output waveguides.

The present disclosure provides an optical device, a substrate-type optical waveguide element, an optical communication apparatus, and a waveguide inter-transferring method. The optical device includes a transfer unit in which a first waveguide and a second waveguide are disposed in an overlapping manner such that a magnitude relationship between an effective refractive index between a vertical mode propagating the first waveguide and a vertical mode propagating the second waveguide is reversed at a position of an input end and a position of an output end. The transfer unit allows the second waveguide as a single-mode waveguide at the input end and allows the second waveguide as a multi-mode waveguide at the output end, through which TM0 light in a maximum vertical mode and light in a high-order mode propagate. The optical device includes a removal unit that allows the second waveguide as a single-mode waveguide through which TM0 light propagates by removing light in a high-order mode from light received from the transfer unit.