Abstract: A fusion method of satellite-based and ground-based lightning data includes S1, selecting valid data in the satellite-based and ground-based lightning data; S2, determining a time threshold for fusing the satellite-based and ground-based lightning data; S3, determining a spatial threshold for fusing the satellite-based lightning data and the ground-based lightning data; and S4, constructing a data fusion scheme to obtain a fused all lightning data set.

Abstract: A time synchronization method includes obtaining a first BLUETOOTH packet from a master device, where the first BLUETOOTH packet carries first time stamp information, and the first time stamp information indicates a sending moment t1 that is of the first BLUETOOTH packet and that is determined based on a clock of the master device; and correcting a local time of a slave device based on the first time stamp information.

Abstract: A receiver optical sub-assembly, a combo bi-directional optical sub-assembly, a combo optical module, an optical line terminal, and a passive optical network system, where the receiver optical sub-assembly includes a first transistor-outline can, where a light incident hole is disposed on the first transistor-outline can, and where a first demultiplexer, a first optical receiver, a second optical receiver, and an optical lens combination are packaged in the first transistor-outline can.

Abstract: An electronic device includes a body and a PPG sensor. The PPG sensor includes: a substrate, a first electrode, a light emitting layer, a light receiving layer, a second transparent electrode, and a transparent panel that are integrally packaged. The substrate and the first electrode are both located on one side of the light emitting layer, and the second transparent electrode and the transparent panel are both located on the other side of the light emitting layer. The light receiving layer, the first electrode, and the second transparent electrode are all located between the substrate and the transparent panel, and a polarity of the first electrode and a polarity of the second transparent electrode are opposite. The light emitting layer includes a light emitting pixel for emitting an optical signal, and the light receiving layer includes a light receiving pixel for detecting the optical signal.

Abstract: A display panel includes a substrate, a photoelectric detector, and a display surface. The photoelectric detector is located on a side that is of the substrate and that is close to the display surface. The photoelectric detector includes a PN junction or a PIN junction. The photoelectric detector is configured to be reverse biased or zero biased when the display apparatus works in an ambient light detection stage to generate a photo-generated current under illumination of ambient light and detect ambient light information. The photoelectric detector is disposed above the substrate, and ambient light needs to penetrate only a part of a film layer structure of the display panel to be received by the photoelectric detector.

Abstract: A receiver optical sub-assembly, a combo bi-directional optical sub-assembly, a combo optical module, an optical line terminal, and a passive optical network system, where the receiver optical sub-assembly includes a first transistor-outline can, where a light incident hole is disposed on the first transistor-outline can, and where a first demultiplexer, a first optical receiver, a second optical receiver, and an optical lens combination are packaged in the first transistor-outline can.

Abstract: An electronic device includes a first optical transmitter, a second optical transmitter, a first optical receiver, and a second optical receiver. The first optical transmitter and the second optical transmitter may respectively transmit a first optical signal and a second optical signal with different wavelengths to a skin surface of a user. The first optical receiver may generate a first PPG signal based on a received first optical signal. The second optical receiver may generate a second PPG signal based on the received second optical signal. The second PPG signal may be used to determine a magnitude of noise in the first PPG signal.

Abstract: An optical transmitter includes a light source and an adjustment structure. The light source is configured to output an original light spot, to transmit a test optical signal to a skin of a user. The adjustment structure is located on an output optical path of the test optical signal.

Abstract: A receiver optical sub-assembly, a combo bi-directional optical sub-assembly, a combo optical module, an optical line terminal, and a passive optical network system, where the receiver optical sub-assembly includes a first transistor-outline can, where a light incident hole is disposed on the first transistor-outline can, and where a first demultiplexer, a first optical receiver, a second optical receiver, and an optical lens combination are packaged in the first transistor-outline can.

Abstract: A transmitter optical subassembly is disclosed including a substrate and a direct modulated laser disposed on the substrate. A single-stage isolator, a polarization direction rotator, and an optical branching filter are disposed side by side on the substrate in a light propagation direction. The polarization direction rotator can adjust linearly polarized light to P-polarized light, the optical branching filter includes an optical splitter subassembly and a filter subassembly, and an optical splitter film in the optical splitter subassembly is an optical splitter film with P polarization. The polarization direction rotator adjusts the incident linearly polarized light to the P-polarized light, and the optical splitter film in the optical branching filter is the optical splitter film with P polarization; all P-polarized light with single polarization can pass through the optical branching filter, without causing any polarization loss or two peaks.

Abstract: A receiver optical sub-assembly, a combo bi-directional optical sub-assembly, a combo optical module, an optical line terminal, and a passive optical network system, where the receiver optical sub-assembly includes a first transistor-outline can, where a light incident hole is disposed on the first transistor-outline can, and where a first demultiplexer, a first optical receiver, a second optical receiver, and an optical lens combination are packaged in the first transistor-outline can.

Abstract: A semiconductor laser, an optical transmitter component, an optical line terminal, and an optical network unit. The semiconductor laser includes a substrate, a lower waveguide layer, a lower confining layer, a central layer, an upper confining layer, a grating layer, an upper waveguide layer, and an electrode layer that are sequentially formed on the substrate. The upper confining layer, the central layer, and the lower confining layer in a filtering region form a core layer of the filtering region. The grating layer in the filtering region includes a slanted grating. Thus, a modulation chirp and dispersion of a transmitted optical pulse can be reduced.

Abstract: An optical signal modulation circuit includes a laser (DFB), a modulator (EAM), and an operational amplifier. The laser (DFB) generates a laser to stimulate the modulator (EAM) to generate a photon-generated current (ip), a first port (a) of the modulator (EAM) is connected to a first input voltage (Vbias), a second port (b) of the modulator (EAM) is connected to an inverting input end of the operational amplifier, a non-inverting input end of the operational amplifier is connected to a second input voltage (Vin), and an output end of the operational amplifier is connected to the first port (a) of the modulator. In the modulation circuit, a photon-generated current (ip) of the EAM is fed back to the operational amplifier, to implement a linear relationship between the second input voltage (Vin) and the photon-generated current (ip) of the EAM, and obtain a linear EML transmission curve, namely, a high-linearity EML.

Abstract: A receiver optical sub-assembly, a combo bi-directional optical sub-assembly, a combo optical module, an optical line terminal, and a passive optical network system, where the receiver optical sub-assembly includes a first transistor-outline can, where a light incident hole is disposed on the first transistor-outline can, and where a first demultiplexer, a first optical receiver, a second optical receiver, and an optical lens combination are packaged in the first transistor-outline can.

Abstract: This application discloses a communication method, an optical line terminal, and an optical network unit in a passive optical network system. The PON system includes an OLT and at least one ONU, and the method includes: receiving, by the OLT, a first message that is sent by a first ONU in the at least one ONU through a first upstream channel; determining a first round trip time (RTT) of the first ONU based on a receiving moment of the first message; determining a time window based on the first RTT; sending first indication information to the first ONU through a downstream channel, where the first indication information includes the time window; receiving a second message that is sent by the first ONU through a second upstream channel within the time window; and determining a second RTT of the first ONU based on a receiving moment of the second message.

Abstract: An optical component packaging structure includes a base, a sealing cover, and a cooler. The base includes a mounting surface and a back surface that faces a direction opposite to that faced by the mounting surface. The cooler includes a cooling plate, a heat dissipation plate disposed opposite to the cooling plate, and a conductive connection body connecting the cooling plate and the heat dissipation plate. The cooling plate includes a cooling surface. The cooler is partially built in the base. The cooling plate faces a direction the same as the mounting surface. The sealing cover covers the mounting surface, and the sealing cover and the mounting surface form a sealing cavity. The cooling surface is located inside the sealing cavity. The heat dissipation plate protrudes from the back surface and is sealedly connected to the base.

Abstract: This application discloses a communication method, an optical line terminal, and an optical network unit in a passive optical network system. The PON system includes an OLT and at least one ONU, and the method includes: receiving, by the OLT, a first message that is sent by a first ONU in the at least one ONU through a first upstream channel; determining a first round trip time (RTT) of the first ONU based on a receiving moment of the first message; determining a time window based on the first RTT; sending first indication information to the first ONU through a downstream channel, where the first indication information includes the time window; receiving a second message that is sent by the first ONU through a second upstream channel within the time window; and determining a second RTT of the first ONU based on a receiving moment of the second message.

Abstract: Embodiments of the present invention disclose a fiber recognition method, an optical line terminal, and a system. The method includes: obtaining, by an optical line terminal, identification information of a fiber connected to an optical line terminal and to be recognized; generating, by the optical line terminal, a data frame that includes the identification information of the fiber to be recognized; transmitting, by the optical line terminal, optical signals that are generated according to the data frame to the fiber to be recognized, so as to make a fiber recognition instrument implement identification for the fiber to be recognized. The present invention can implement fiber recognition easily and conveniently. When a new ONU user is added to a distributed network, service interruption can also be avoided for a user who is normally using a service, and the cost is low.

Abstract: An optical signal modulation circuit includes a laser (DFB), a modulator (EAM), and an operational amplifier. The laser (DFB) generates a laser to stimulate the modulator (EAM) to generate a photon-generated current (ip), a first port (a) of the modulator (EAM) is connected to a first input voltage (Vbias), a second port (b) of the modulator (EAM) is connected to an inverting input end of the operational amplifier, a non-inverting input end of the operational amplifier is connected to a second input voltage (Vin), and an output end of the operational amplifier is connected to the first port (a) of the modulator. In the modulation circuit, a photon-generated current (ip) of the EAM is fed back to the operational amplifier, to implement a linear relationship between the second input voltage (Vin) and the photon-generated current (ip) of the EAM, and obtain a linear EML transmission curve, namely, a high-linearity EML.

Abstract: A transmitter optical subassembly is disclosed including a substrate and a direct modulated laser disposed on the substrate. A single-stage isolator, a polarization direction rotator, and an optical branching filter are disposed side by side on the substrate in a light propagation direction. The polarization direction rotator can adjust linearly polarized light to P-polarized light, the optical branching filter includes an optical splitter subassembly and a filter subassembly, and an optical splitter film in the optical splitter subassembly is an optical splitter film with P polarization. The polarization direction rotator adjusts the incident linearly polarized light to the P-polarized light, and the optical splitter film in the optical branching filter is the optical splitter film with P polarization; all P-polarized light with single polarization can pass through the optical branching filter, without causing any polarization loss or two peaks.