Abstract: Optical transmitter comprises: N light sources with different wavelengths; m levels of beam splitting section comprising m levels of beam splitter section and m levels of waveguide crossing section, each level waveguide crossing section comprises N×2m channels; first level beam splitter section divides optical signals from N light sources into a 2N-channel output signal; k+1-th level beam splitter section divides an N×2k-channel output signals from k-th level beam splitter section into an N×2k+1-channel output signal, an output signal of each channel has one output power; N×2m function blocks and 2m multiplexers, N×2m-channel output signal produced by m-th level beam splitting section connect to m levels of waveguide crossing section and then function blocks and multiplexers sequentially, each multiplexer combines N-channel output signal with different wavelengths. Achieved signal transmission in multi-channel, multi-wavelength, having flexible extension.

Abstract: An ion-doped optical waveguide structure and a use method thereof, and an ion-doped optical waveguide array are provided. The ion-doped optical waveguide structure comprises an optical waveguide; the doped region comprises a P-type doped region and an N-type doped region which are arranged on the two sides of the optical waveguide respectively, and the P-type doped region and the N-type doped region are isolated from each other; the electrodes are arranged on the P-type doped regions and the N-type doped regions; the electric signal adjusting circuit comprises a plurality of electric input ends and at least one electric output end, the electric input ends and the electric output ends are connected to the corresponding electrodes respectively, and the electric signal adjusting circuit is used for adjusting the magnitude of electric signals applied to the electrodes.

Abstract: Provides optical phased array chip with contra-directional coupler, system and calibration method, applied to saving chip size. Optical phased array chip comprises: m levels of beam splitting section, each comprises optical splitter group and optical waveguide branch group; m-th level of optical waveguide branch group comprises N paths of first optical waveguide branch, configured to transmit an N-channel output signal; each path of first optical waveguide branch has a thermo-optical phase shifter arranged, end of each path of optical waveguide branch has an emitting element connected; upper layer or lower layer of each path of optical waveguide branch has at least one contra-directional coupler arranged, contra-directional couplers in two paths of first optical waveguide branch combine light by two paths of second optical waveguide branch and form an interferometer structure, configured to transmit an optical signal after being combined and interfered to a detector for phase calibration.

Abstract: A preparation process of a multi-height waveguide is provided, which comprises the following steps of: providing a substrate, forming a first coating layer on one surface of the substrate, and forming a first waveguide layer on the surface, far away from the substrate, of the first coating layer; performing photoetching and etching on the first waveguide layer for the first time to complete full-height region patterning of the multi-height waveguide; performing photoetching and etching on the first waveguide layer for the second time to complete the patterning of the shallow etching area of the multi-height waveguide; performing photoetching and etching on the first waveguide layer for the third time to complete deep area patterning of the multi-height waveguide; the etching step is carried out step by step in a hard mask self-alignment mode.

Abstract: A frequency-modulated system includes a signal generation module providing a first laser signal, a second laser signal, a third laser signal and a fourth laser signal with different frequencies to form an input laser signal in a first polarization state; the silicon optical chip divides an input laser signal into a detection signal and a local oscillator signal, receives a reflection signal component in a second polarization state as an echo signal, converts the reflection signal component into a first polarization state, and mixes the reflection signal component with the local oscillator signal; and the signal processing module performs decoupling according to the beat frequency signal to obtain distance information and instantaneous speed information of the target object. According to the disclosure, the dot frequency is improved, and smaller detection resolution is realized point frequencies in each frame and detection resolution are improved.

Abstract: Present disclosure relates to field of semiconductor manufacturing, provides photonic integrated chip, array and testing method thereof. Chip includes functional assembly, light test assembly and electric test assembly manufactured through semiconductor process. Light test assembly and electric test assembly are connected respectively to different sides of functional assembly; functional assembly includes N functional units, and N is positive integer; each functional unit includes optical interface and first pad; first pad is configured to input or output electric signal in working environment; light test assembly includes main beam port and light splitting unit; input end of light splitting unit connects with main beam port; a plurality of output ends of light splitting unit connect with optical interfaces of N functional units; electric test assembly connects electrically with first pads, configured to test electrical performance of N functional units.

Abstract: Optical antenna includes waveguide; first dielectric structures are arranged outside two sides of waveguide respectively and are symmetrically and periodically arranged in light propagation direction; second dielectric structures are arranged on two sides of upper portion of waveguide respectively and are symmetrically and periodically arranged in light propagation direction; waveguide, first dielectric structures and second dielectric structures are isolated by third dielectric, periodic size of first dielectric structures is consistent with periodic size of second dielectric structures, and first dielectric structures and second dielectric structures have certain relative displacement deviation in light propagation direction; evanescent field around waveguide is disturbed through first dielectric structure and second dielectric structure, so that two correspondingly generated radiation light fields cancel interference below waveguide, and radiation energy is radiated to upper free space side.

Abstract: Discloses an arbitrary polarization mode generator based on a photonic integrated circuit, which includes a plurality of polarization structures arranged on the photonic integrated circuit and forming an array, each polarization structure in the array is configured to disassemble a polarization state in a target mode into the plurality of units correspondingly, and a polarization state of each unit after disassembly is independently completed by one of the polarization structure correspondingly, so that generating any required polarization state is realized. According to the disclosure, the polarization state of the non-uniformity mode in a polarization space is disassembled, and an independent polarization is generated by using the polarization structure, so as to generate any polarization mode including a vector mode can be realized by using on-chip design, having a plurality of advantages including low cost, good stability and high integration degree, and convenient for productization.

Abstract: A grating antenna includes a waveguide, a plurality of groove structures, arranged inwards on a surface of the waveguide and periodically along a light transmission direction; a plurality of grating structures, arranged outwards on two sides of the waveguide, symmetrically and periodically in the light transmission direction; a period size of the groove structures is consistent with a period size of the grating structures, the groove structures and the grating structures have a certain relative displacement offset in the light transmission direction, and an intensity of a first radiation light field generated by the groove structures is substantively equal to that of a second radiation light field generated by the grating structures. According to the disclosure, a high-efficiency unidirectional radiation characteristic of the grating antenna in a free-space can be realized, and a radiation efficiency of the grating antenna does not oscillate along with wavelength in a target wavelength domain.