Abstract: The present disclosure relates to a laser coupling device, which includes a plurality of laser units, configured to emit laser beams; and at least one first convex lens, arranged on optical paths of the laser beams and configured to converge the laser beam. The laser coupling device can emit laser beam with a high power.

Abstract: The embodiments of the present disclosure provide a method and a device for controlling a starting of a virtual machine based on a data processing unit (DPU). The method comprises: sending, in response to receiving an instruction for starting a plurality of virtual machines by the DPU, an instruction for creating a plurality of virtual machine managers to a host to which the DPU belongs, wherein one virtual machine manager is configured to manage one virtual machine; creating a plurality of virtual machine managers by the host, and concurrently starting a plurality of virtual machines by the virtual machine managers using a resource on the host; and offloading, in response to a completion of concurrently starting the plurality of virtual machines, the virtual machine managers from the host to the DPU, and managing the plurality of started virtual machines by the virtual machine managers using a resource on the DPU.

Abstract: Embodiments of the present disclosure provide an inter-application communication method and apparatus based on a virtualized device, and an electronic device. The method includes: receiving a first event message sent by a first application running in an operating system of a host, where the first event message is used to request a second application running in an operating system of a compute card to perform a target function, and the operating system of the host communicates with the operating system of the compute card through a driver; processing the first event message through an event proxy to generate a second event message including an event file descriptor, where the event proxy is configured to implement bidirectional mapping between the event file descriptor and the driver; and sending the second event message to a virtualized device, to establish a communication channel between the first application and the second application.

Abstract: The present disclosure provides an offloading method and device for a shared directory file system between a host and a virtual machine. The method includes: offloading a VIRTIOFS process on a host to a DPU; establishing a DMA communication channel through a DMA driver front-end controller configured in a first operating system in the host and a DMA driver back-end controller configured in a second operating system in the DPU; and controlling, through the DPU, the VIRTIOFS process to communicate with a virtual machine deployed on the host based on the DMA communication channel, to implement access to and data processing of the shared directory file system. According to the present disclosure, the VIRTIOFS process and the shared directory file system can be migrated from the host to the DPU, and the shared directory can be implemented through a direct memory access technology.

Abstract: The present disclosure provide a data transmission method, an electronic device and a non-transient computer-readable storage medium.

Abstract: The present disclosure provides a scanning device, including a laser transmitter and a reflection assembly. The reflection assembly includes a drive member and a first reflector, the drive member being configured to drive the first reflector to rotate; the laser transmitter is configured to emit a laser beam, and an emitting end of the laser transmitter is arranged facing the first reflector, causing the laser beam being emitting toward the first reflector and the first reflector to reflect the laser beam to change a direction of the laser beam.

Abstract: The present disclosure relates to a laser coupling device, which includes a plurality of laser units, configured to emit laser beams; and at least one first convex lens, arranged on optical paths of the laser beams and configured to converge the laser beam. The laser coupling device can emit laser beam with a high power.

Abstract: The present invention discloses a 3D print head for FDM rubber material and a 3D printer using same. The 3D print head for FDM rubber material comprises a motor, a feeding assembly, a radiator, a heating block and an extrusion nozzle, and further comprises a venturi assembly. The venturi is installed between the radiator and the heating block by the mounting component, and a gap is formed between an upper end face of the venturi and the radiator. The motor drives the feeding assembly to feed material to the heating block through the venturi and extrude the material through the extrusion nozzle. The venturi of the present invention can greatly reduce the heat conduction through the venturi, to guarantee that thermo-plastic-rubber material used for printing is not softened and all the fed low-hardness and high-elasticity material can be effectively transferred before entering the heating block.

Abstract: A method for testing an optical fiber includes: receiving a test optical signal from an optical fiber network, and converting the test optical signal into a test current signal; receiving, by a transimpedance amplifier, the test current signal by using a first working mode and outputting a first test voltage signal; acquiring a swing of the first test voltage signal, and determining whether the swing of the first test voltage signal meets a preset condition; and receiving, by the transimpedance amplifier, the test current signal by using a second working mode and outputting a second test voltage signal when the swing of the first test voltage signal meets the preset condition, where an upper limit and a lower limit of a receiver dynamic range when the transimpedance amplifier works in the first working mode are different from those when the transimpedance amplifier works in the second working mode.

Abstract: An apparatus comprising an optical transceiver module. The apparatus also includes an interface coupled to the optical transceiver and comprising a plurality of pins. The interface is configured to communicate a burst data word at a data rate of about one data word within about a shortest burst time based on multiplexing one of a plurality of control and/or monitoring signals onto one of the plurality of pins.

Abstract: Embodiments of the present disclosure disclose an OTDR test signal modulation circuit, including a laser diode drive, a laser diode, a current adjusting unit, and an OTDR control unit. The laser diode drive is connected to the laser diode and is configured to drive, according to an input data signal, the laser diode to transmit data light. The current adjusting unit is connected to the laser diode and the OTDR control unit and is configured to adjust a current flowing through the laser diode according to an OTDR test signal provided by the OTDR control unit, so as to modulate the OTDR test signal to the data light transmitted by the laser diode. Moreover, the embodiments of the present disclosure also disclose a passive optical network system and apparatus.

Abstract: A method can be used for controlling optical power. Output optical power of an optical source is monitored and it is determined whether a preset test control signal is received. When the preset test control signal is not received, a data signal is modulated to output light of the optical source and a bias current of the optical source is adjusted according to an output optical power monitoring result of the optical source to implement automatic power control. When the preset test control signal is received, a test is started and a test signal is superimposed to the data signal to form a superimposed signal. The superimposed signal is modulated to the output light of the optical source. The output optical power monitoring result of the optical source is ignored during the test period to maintain the bias current of the optical source at a preset target value.

Abstract: A method for testing an optical fiber includes: receiving a test optical signal from an optical fiber network, and converting the test optical signal into a test current signal; receiving, by a transimpedance amplifier, the test current signal by using a first working mode and outputting a first test voltage signal; acquiring a swing of the first test voltage signal, and determining whether the swing of the first test voltage signal meets a preset condition; and receiving, by the transimpedance amplifier, the test current signal by using a second working mode and outputting a second test voltage signal when the swing of the first test voltage signal meets the preset condition, where an upper limit and a lower limit of a receiver dynamic range when the transimpedance amplifier works in the first working mode are different from those when the transimpedance amplifier works in the second working mode.

Abstract: An apparatus comprising an optical transceiver module. The apparatus also includes an interface coupled to the optical transceiver and comprising a plurality of pins.