7 results about "Nonlinear waveguide" patented technology

The invention belongs to the technical field of quantum information, and relates to a non-detection photon imaging system based on a single optical fiber integrated nonlinear waveguide. Comprising a continuous tunable pumping laser source, an optical amplifier, an adjustable optical attenuator, a first beam splitter, a first adjustable optical delay line, a first polarization controller, a second polarization controller, a first optical circulator, a nonlinear straight waveguide, a second optical circulator, a first optical filter, a second optical filter, a third optical filter, a fourth optical filter, a third optical circulator, a second adjustable optical delay line and an optical absorption terminal. The system comprises a first light collimator, a first lens, a three-dimensional scanning platform, a second lens, a second light collimator, a second beam splitter, a third polarization controller, a fourth polarization controller, a first single-photon detector, a second single-photon detector and a coincidence measurement unit. Compared with a traditional non-detection photon imaging system, quantum imaging of a transparent object can be achieved only through half of resource expenditure, and robustness is provided for the imaging system through all-fiber integrated configuration.

The application relates to a waveguide loss measurement method based on double-channel detection, which is used for accurately obtaining the linear loss coefficient of a nonlinear waveguide to be measured. Pump light, probe light and auxiliary laser are combined and injected into the waveguide to be measured to trigger a four-wave mixing effect to generate idler light; then, the waveguide output light is split into two paths through a light splitting element, and the idler light signal and the auxiliary laser signal are extracted as a measurement channel and a reference channel; the waveguide temperature is adjusted to stabilize the idler light power, and a linear interval of the probe light and the idler light power is obtained through fitting; the probe light power is fixed in the interval, a noise compensation factor is generated by using the average power and the instantaneous power of the auxiliary laser, the idler light power is corrected in real time, and finally the waveguide loss is calculated based on the corrected data. The method realizes real-time noise cancellation through double channels, combines parameter locking and linear interval screening, greatly improves the measurement stability and precision, and adapts to the loss detection requirements of various nonlinear waveguides.

The application provides a chip-on nonlinear amplification gain waveguide structure, which comprises, in sequence, an input waveguide, a first mode converter, a second mode converter, a nonlinear waveguide, a third mode converter and a fourth mode converter; a first signal light is input from the input waveguide to the fourth mode converter, is converted and output as a second signal light by the fourth mode converter, is input from the fourth mode converter to the first mode converter, is converted and output as a third signal light by the second mode converter, is input from the second mode converter to the third mode converter, and is converted and output to an output waveguide by the third mode converter. The application adopts a mode circulation type nonlinear gain amplification waveguide structure composed of multiple mode conversion devices, improves the space utilization of the chip-on waveguide, increases the action length of the optical field and the waveguide, thereby improving the generation efficiency of the nonlinear effect in a unit area, and realizing the effect of amplification gain.

The application discloses an AlGaAs second-order nonlinear and linear optical waveguide integrated monolithic and a manufacturing method thereof. x Ga 1‑x As composition; the surface of the epitaxial layer is used to manufacture a photoetching mask, and then the Bragg upper reflection layer is etched to form a ridge waveguide structure comprising a second-order nonlinear waveguide region and a second-order linear waveguide region; the second-order nonlinear waveguide region is used to manufacture a photoetching mask, and then the Bragg lower reflection layer of the second-order linear waveguide region is etched to complete the manufacturing. The application can realize seamless monolithic integration of AlGaAs optical nonlinear waveguide and linear waveguide, and provides a simple and high-integration chip manufacturing method for the fields of nonlinear optics and integrated quantum optics.

This invention discloses an on-chip nonlinear waveguide mode conversion device and its fabrication method based on ferroelectric domain engineering. The device includes a Z-cut thin-film lithium niobate waveguide, which, from top to bottom, comprises a Z-cut thin-film lithium niobate, a silicon dioxide layer, and a silicon substrate. The Z-cut thin-film lithium niobate layer has a two-dimensional ferroelectric domain structure with periodically alternating positive and negative domains. The electrode structure for fabricating this two-dimensional ferroelectric domain structure consists of n+1 groups of comb-shaped electrodes arranged alternately, with the electrodes insulated from each other. Each group of comb-shaped electrodes is periodically arranged, with the electrode width being 1 / 4 of the polarization period, and n being the number of nodes in the target transverse electric field. This invention utilizes high-voltage electric field polarization technology and semiconductor fabrication processes to fabricate a Z-cut thin-film lithium niobate waveguide with a two-dimensional ferroelectric domain structure on a thin-film lithium niobate material platform, thereby solving the nonlinear conversion problem from the fundamental mode to the second harmonic higher-order mode of the waveguide, and also exhibits scalability.

The utility model provides an identical photon pair light source, which comprises a pump laser, a nonlinear waveguide, a filter, a wavelength division multiplexer and a single photon frequency shifter, can output a plurality of identical photon pairs with different wavelengths through a single nonlinear waveguide, and is simple and compact in structure, high in integration level, wide in spectral range of the generated identical photon pairs, and high in efficiency. And multiple wavebands and multiple application scenes, such as a quantum communication waveband, a quantum measurement waveband and a quantum optical experiment waveband, are supported.

This invention provides a broadband phase-matching control method, system, device, and storage medium, belonging to the field of integrated photonics technology. The method includes: acquiring dispersion parameters and pump parameters, calculating phase mismatch parameters at each frequency point; calculating the optimal nonlinear action length at each frequency point and establishing a mapping relationship between frequency and optimal nonlinear action length; constructing a spatial action length scheduling function and converting it into a control parameter distribution for the corresponding nonlinear action process, thereby scheduling and controlling the nonlinear action process in the nonlinear waveguide; during the execution of the scheduling control, acquiring the output parameters for each frequency channel and updating the spatial action length scheduling function to output the multi-frequency channel output results. This invention achieves adaptive scheduling control of the multi-frequency channel nonlinear action process under broadband conditions, thereby improving the consistency and stability of the output of each frequency channel.