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.