142results about "Electromagnetic repeaters" patented technology

The embodiment of the invention provides a gain regulation and control precision maintenance method for a programmable Raman amplifier. The method comprises the following steps: acquiring basic scene sample data and target scene sample data to form a source domain sample data set and a target domain sample data set; selecting a proper machine learning method as a basic learning algorithm according to the characteristics of the data in the data set; initializing weights occupied by a source domain sample and a target domain sample; fitting a prediction model by adopting a basic learning algorithm according to the weights of the source domain sample and the target domain sample; re-weighting the source domain sample and the target domain sample according to the total weighting error of the target domain sample so as to correct the difference between the distribution of the source domain sample and the distribution of the target domain sample; and obtaining a model after multiple iterations as a pumping prediction model of the programmable Raman amplifier. When the use scene of the programmable Raman amplifier changes and the accuracy of the regulation and control algorithm of the programmable Raman amplifier is reduced, by means of the method, maintenance of the gain regulation and control precision of the programmable Raman amplifier can be achieved by collecting a small amount of sample data, and the use scene of the programmable Raman amplifier is effectively expanded.

A regenerative relay transponder includes: an optical receiving unit that receives an optical signal from a transmitting device as a reception optical signal and converts the reception optical signal into an electrical signal; an electrical-signal processing unit that executes predetermined processing on the electrical signal; an optical transmitting unit that generates a transmission optical signal by converting the electrical signal subjected to the predetermined processing into an optical signal and transmits the transmission optical signal; and a monitoring unit that monitors the predetermined processing by the electrical-signal processing unit, wherein the monitoring unit accumulates in a storage unit monitoring data, which indicates the result of the monitoring, over a predetermined period and causes a communication unit to transmit the monitoring data accumulated over the predetermined period as transmission data to the transmitting device.

Techniques are described for implementing free space optical (FSO) ground-to-satellite communications. In general, an optical ground station communicates optically with a satellite via a ground-to-satellite FSO communication link. Embodiments described herein deploy at least two FSO relays at one or more aerial platform altitudes to effectively segment the ground-to-satellite FSO communication link into three or more FSO sub-links. Each FSO sub-link has better optical link performance (e.g., lower outage probability) than a single direct link. The FSO relays can include tropospheric FSO relays on low-altitude platforms and / or stratospheric FSO relays on high-altitude platforms, and architectures can use the FSO relays in a serial and / or parallel manner.

The application discloses a kind of photonic-assisted terahertz signal transmission system and method, including the terahertz signal photon generation module, transmission module and photoelectric conversion module connected in turn;The terahertz signal photon generation module is used to generate the optical signal containing terahertz signal;The transmission module is used to transmit the optical signal containing terahertz signal at different distances, and send it into photoelectric conversion module;The photoelectric conversion module is used to convert the received optical signal containing terahertz signal into terahertz signal.Setting a laser realizes multiple multi-band signal generation, avoids using external cavity laser to reduce the phase noise of generated signal, in addition, long-distance transmission is carried out using optical fiber, solve the technical problem that prior art cannot realize long-distance communication.

A method and system for dual-hop quantum communication utilizing a quantum source node, a plurality of quantum repeaters, and a quantum receiver. The method involves transmitting, by a quantum source node teleporter, a message containing at least one superconducting qubit to multiple quantum repeaters over time-varying amplitude damping channels. Each quantum repeater measures a first hop relaxation time, estimates a second hop relaxation time, and calculates a minimum composite relaxation time. The minimum composite relaxation times are transmitted to the quantum source node, which selects the quantum repeater with the largest composite relaxation time to forward the message during the second hop. The selected quantum repeater transmits the message to the quantum receiver, establishing entanglement between repeater memory qubits and receiver memory qubits. The invention further includes methods for estimating quantum outage probabilities and utilizing error correction to ensure reliable quantum communication.

The invention provides an apparatus for quantum communication in a quantum network configured to create an entangled pair of quantum information carriers comprising a first quantum information carrier and a second quantum information carrier, transmit the first quantum information carrier to a remote device, store the second quantum information carrier in a quantum memory, receive, from the remote device, information about a phase correction related to the transmission of the first quantum information carrier, and apply the phase correction to the second quantum information carrier.

This invention discloses a high-speed direct-modulation direct-detection passive optical network (SOA) receiver control method and system, relating to the field of optical access network technology. The high-speed direct-modulation direct-detection SOA receiver control method includes the following steps: amplifying the received optical signal and calculating the corresponding received power and bit error rate; using the received power and bit error rate as control parameters, performing closed-loop control to determine the optimal optical signal amplification amplitude. This invention enables the SOA output signal to be at the optimal received amplitude at the receiver, thereby increasing the receiver's power budget.

The application discloses a self-adaptive Raman gain compensation system and method, and relates to the technical field of optical communication, wherein the self-adaptive Raman gain compensation system comprises: an optical fiber link; a Raman optical amplifier used for amplifying an input optical signal transmitted by the optical fiber link; a centralized optical amplifier used for amplifying an optical signal output by the Raman optical amplifier; and a compensation device used for acquiring and comparing partial optical powers of the input optical signal and the optical signal output by the centralized optical amplifier, and controlling the gain of the centralized optical amplifier based on a comparison result. The application can realize self-adaptive gain compensation when the gain of the Raman amplifier is insufficient.

The utility model relates to an optical communication coupling module. The optical communication coupling module comprises at least one photodiode, an analog-to-digital converter, and a variable resistor or a digital-to-analog converter. The photodiode is used for detecting the quantity of laser light; an analog-to-digital converter connected to the photodiode; the variable resistor is connected to the photodiode, and the digital-to-analog converter is connected to the analog-to-digital converter; according to a comparison result of an input voltage of the photodiode and a threshold voltage, a resistance value of the variable resistor is adjusted, or a reference voltage of the analog-to-digital converter is adjusted, so that whether the analog-to-digital converter is started or not is determined, and the analog-to-digital converter is in a dynamic range.

An optical transceiver (101) of an optical relay apparatus includes: a coherent reception front-end unit (110) that coherently detects an input optical signal to be input, based on local oscillation light, and outputs the coherently detected first analog electric signal; a coherent transmission front-end unit (120) that coherently modulates a second analog electric signal acquired by turning around the first analog electric signal, based on transmission light, and outputs the coherently modulated output optical signal; and an analog compensation unit (130) that performs analog signal processing on the first analog electric signal in such a way as to compensate for signal quality according to a signal characteristic between an input of the coherent reception front-end unit (110) and an output of the coherent transmission front-end unit (120), and thereby generates the second analog electric signal.

An adjustable frequency optical repeater is provided that includes an acousto-optic device (AOD) in a double-pass configuration. The AOD is configured to receive (a) an input beam propagating in a first direction toward the AOD from a first side of the AOD and (b) an electrical drive signal. The optical repeater also includes an array of output optical elements that includes a plurality of output optical elements disposed on the first side of the AOD. Each output optical element of the plurality of output optical elements is configured to provide a respective output beam that propagates substantially parallel to a second direction or antiparallel to the second direction. The plurality of output optical elements are spaced apart from one another in a third direction that is transverse to both the first direction and the second direction.

Systems and methods for operating a passive optical network (PON) extender. The methods comprise: receiving, by the PON extender, a first optical signal from a remote node device of a passive optical network via a first optical link; amplifying the first optical signal using a Raman amplifier of the PON extender to obtain a first Raman amplified optical signal; amplifying the first Raman amplified optical signal using a first optical amplifier of the PON extender to obtain an amplified uplink signal (wherein the first optical amplifier is different than the Raman amplifier); and passing the amplified uplink signal to an optical line terminal via a second optical link (wherein the optical line terminal is disposed locally at a hub site along with the PON extender).

This relay system (10) relays data to be transmitted to any one among a plurality of transmission destinations, the relay system comprising: a reception unit (11A) that receives the data; a conversion unit (11B) that converts the data received by the reception unit into an optical signal of a wavelength that differs depending on the transmission destination, to which the data is to be transmitted, among the plurality of transmission destinations; and an output unit (11C) that outputs the optical signal converted by the conversion unit to an optical transmission line (L2). The foregoing makes it possible to shorten the transmission time for all of the plurality of pieces of data of different transmission destinations.

A long-distance DWDM lightwave transmission system operating in the 2000 nm wavelength region is proposed that is based on the utilization of hollow core fiber configured to exhibit low loss (e.g., on the order of 0.02 dB / km) in combination with a hybrid TDFA / HDFA repeater device. Multiple concatenated spans of the combination of the hollow core fiber and hybrid TDFA / HDFA repeater device are able to provide communication over path lengths in excess of 10,000 km without the need for electronic regeneration of the propagating signals. In one case, the hollow core fiber is configured as a double-nested anti-resonant nodeless fiber (DNANF) with the number of nested structures and their various parameters optimized to provide the low loss operation in the 2000 nm region.

The utility model discloses an unmanned plane optical fiber communication system, including airborne module, first type relay module, second type relay module and central control module, first type relay module has several, and first type relay module includes optical amplifier, airborne module is installed in unmanned plane and is connected unmanned plane's control unit, and airborne module is connected nearest end's first type relay module through optical fiber, and adjacent first type relay module is connected through optical fiber, and the first type relay module of farthest end is connected second type relay module through optical fiber, and second type relay module and central control module central control module wireless connection, and airborne module is communicated with central control module through first type relay module, second type relay module and central control module bidirectionally. The utility model discloses the combination of optical fiber communication and wireless communication, and the mode of relay, can effectively improve the working distance of optical fiber unmanned plane, and can increase the anti -interference distance to increase the safe working distance of optical fiber unmanned plane.

Disclosed is a quantum router including a photon pair generation device that generates a deterministic entangled photon pair, a polarization adjustment device that converts and outputs a polarization state of the deterministic entangled photon pair, a multiplexing device that outputs first indistinguishable photons through first paths and outputs second indistinguishable photons through second paths, by performing double multiplexing on the output of the polarization adjustment device, and a control device that receives the second indistinguishable photons through the second paths. The first indistinguishable photons are transmitted to a plurality of nodes through the first paths. The control device is further configured to provide a quantum communication channel for two nodes among the plurality of nodes by performing bell-state measurement on two of the second indistinguishable photons.

The present application relates to the technical field of optical frequency transfer, and particularly relates to a relay system and method for realizing automatic phase locking of optical fiber optical frequency transfer, which comprises: an optical fiber beam splitter for splitting signal light into two parts; an acousto-optic modulator for frequency shifting; a relay laser for generating regenerative laser; a photodetector for beat frequency between signal light and regenerative laser; a signal processing and discrimination locking unit for processing beat frequency signals and discriminating whether to lock at a target frequency; a control unit for maintaining the locking state of the regenerative laser when it is discriminated that the frequency of the regenerative laser is locked; and outputting the locked regenerative laser to the next optical fiber link after frequency shifting by a third acousto-optic modulator; and the specific method is to realize automatic frequency locking and relocking of the regenerative laser through double beat frequency signal discrimination and feedback control, and to ensure stable relay of optical frequency signals. The present application improves the long-term stability and reliability of the relay system.

An optical fiber amplifier includes a first optical combining / splitting module, a multi-core gain module, and a second optical combining / splitting module. The first optical combining / splitting module is configured to couple a first optical signal to a first gain fiber core. The first gain fiber core is configured to amplify optical power of the first optical signal to obtain a second optical signal, and is configured to couple the second optical signal to the second optical combining / splitting module. The second optical combining / splitting module is configured to couple the second optical signal to a second gain fiber core. The second gain fiber core is configured to amplify optical power of the second optical signal to obtain an amplified second optical signal, where the first gain fiber core and the second gain fiber core separately perform optical power amplification based on different pump optical signals.

An operating method of a space laser communication device is provided. The operating method includes a step of performing optical alignment so that one of optical systems performs optical multiple input multiple output (MIMO)-based full-duplex communication with another space laser communication device, based on motion control by a motion control device and a step of performing optical alignment so that the other optical system of the optical systems performs optical MIMO-based relay communication with another space laser communication device, based on motion control by the motion control device.

According to one embodiment, an optical repeater system is provided with a master station including: an inter-master timing comparator that detects delay adjustment amounts respectively corresponding to a plurality of TDD transceivers, based on a switching timing detected by a TDD timing detector and information acquired by a cable delay compensator, and that transmits the delay adjustment amounts to the master station; and a TDD timing delay adjustor that delays signals from the TDD transceivers, using the delay adjustment amounts. The optical repeater system is provided with another master station including: a TDD timing detector that detects switching timings between downlink and uplink for the plurality of TDD transceivers; an intra-master station timing comparator that transmits information on the switching timings between downlink and uplink for the plurality of TDD transceivers; and a TDD timing delay adjustor that delays signals from the TDD transceivers, using the delay adjustment amounts.

Transparent optical repeater for satellite, and communication satellite including such a repeater. This transparent optical repeater, configured for onboard use on a satellite, comprises: - an optical fiber (OF) assembly; - a first optical head (OHU1); - a first low-noise optical amplifier (LNOA); - a polarization splitter and controller (PCS) comprising, for each output channel of the bandpass filter (BPF), a channel polarization splitter and controller (C-PCS); - a third high-power optical amplifier (HPOA), per output channel of the polarization splitter and controller (PCS); - a polarization combination unit (PBC), configured to recombine the respective output channels of the two optical multiplexers (HPWDM); and - a second optical head (OHU2) configured to output the optical signals from the output of the polarization combination unit (PBC). Figure for the abstract: [Fig. 4]

The present disclosure is to perform quantum communication by using a quantum-entangled state in a communication system. An operation method of a first device may comprise the steps of: acquiring system information; performing an initial access procedure on the basis of the system information; receiving information regarding a network configuration from a control device; receiving information regarding measurement from the control device; reporting a measurement result to the control device; and receiving, from the control device, information regarding a path determined on the basis of the measurement result.

There are provided methods and systems for performing pre-deployment and post- deployment optimization of parameters of reconfigurable intelligent surfaces (RISs) for propagation of electromagnetic (EM) signals between transmitters and receivers in wireless environments comprising a plurality of objects. The pre-deployment optimization includes use of wave propagation models based on a layout of the environment to determine propagation paths of the EM signals between the transmitter and the receiver. An optimization algorithm is used to determine locations and parameters of at least one RIS. The post deployment optimization includes receiving RIS parameter of at least one RIS, receiving an angle of arrival (AoA) of incident EM signals on the RIS and determining updated RIS parameters to maximize EM signals received by the receiver.

This application discloses an optical fiber, an optical amplifier, and an optical transmission network for expanding the gain spectral width of optical fiber signal amplification and achieving long-distance broadband transmission. The optical fiber provided in this application includes: a first doped layer, a second doped layer, and a cladding. The second doped layer is located outside the first doped layer, and the cladding is located outside the second doped layer. The second and first doped layers are composed of different materials. The cladding is used to reflect pump light, as well as first-band and second-band signal light, through its inner wall. The first doped layer is used to amplify the first-band signal light using the energy of the pump light. The second doped layer is used to amplify the second-band signal light using the energy of the pump light.

A system is provided along a route of a network including a first transponder at a first node and a second transponder at a second node. The system further includes one or more processors configured to detect, in a first waveform measured at the first transponder, a first signature at a first time point, and configured to detect, in a second waveform measured at the second transponder, a second signature at a second time point. The one or more processors may correlate the first waveform and the second waveform, and determine, based on the correlation, that the first signature and the second signature correspond to a same event occurring along the route of the network. Based on comparing the first time point and the second time point, the one or more processors may determine an estimated location of the event.

The application discloses a kind of using OLT as cloud relay terminal equipment cloud method, specifically relates to OLT transmission technical field, including a kind of using OLT as cloud relay terminal equipment cloud method, including the following steps: S1, OLT is connected to cloud platform first;S2, user creates the request of access terminal;S3, terminal equipment establishes WAN link, obtains IP address from OLT;S4, OLT is requested to establish relay tunnel, from cloud by request ID resource;S5, remote request is forwarded to terminal equipment, the present application changes the mode that existing OLT sends data to ONU, and the verification distinguishing of other ONU being carried out data communication is carried out using the verification code information in processing module, and it is verified that two ONU demand data is identical if successful, and equal amount of data transmission is directly copied in OLT to corresponding ONU, not only improve the interaction speed of data, also greatly reduce the operation pressure of cloud data.

Transmitter, receiver, transmission chain and associated information transmission method The present invention relates to a transmitter (4), comprising: an optical modulator (14), configured to modulate an electrical signal (Sel) into an optical signal (S) comprising a first polarization along a first polarization axis and a second polarization along a second polarization axis; an optical rotation module (16), configured to generate a rotated optical signal (St) by rotating the first and second polarizations; an amplifier module (18), comprising: a polarization beam splitter, configured to separate the rotated optical signal into a first optical component along the first polarization axis and a second optical component along the second polarization axis; a first optical amplifier, configured to amplify the first optical component;a second optical amplifier, configured to amplify the second optical component; and a polarization beam combiner. Figure for the abstract: Figure 2;

To provide a management device, an optical node device, an optical network system, a control method, and a non-transitory computer-readable medium that effectively suppress degradation of signal quality.SOLUTION: A management device 10 includes a path management unit 11 that manages wavelength resources available for paths in a photonics network having nodes that perform wavelength conversion by optical-analog-optical conversion and the usage status of the wavelength resources, a wavelength conversion management unit 12 that manages wavelength conversion information of paths including wavelength conversion at nodes that constitute the paths, and a control unit 13 that controls wavelength conversion at the nodes on the basis of the managed wavelength resources and usage status, and controls analog compensation at the nodes on the basis of the wavelength conversion information of the managed paths.SELECTED DRAWING: Figure 6

The utility model relates to the technical field of communication equipment, in particular to an optical fiber signal amplifier. Comprising a bottom plate, a protective cover, an optical fiber signal amplifier body, a control panel, an indicator lamp and a lifting mechanism, the lifting mechanism comprises a lifting plate, a T-shaped threaded sleeve, a mounting support, a screw, a speed reducer, an L-shaped plate, a fixing lug, a T-shaped rod, a signal device and a turnover device, and the speed reducer is controlled by the control panel to act to drive the screw to rotate to achieve descending of the lifting plate; through cooperation of the fixing lugs, the overturning device is overturned to seal a cavity opening, allowing the optical fiber signal amplifier body to be ejected out, in the top of the protective cover, so that the optical fiber signal amplifier body can be well protected when not in use; therefore, the problems that the service life of the amplifier is limited and the cost is increased due to the fact that no effective protection device is provided for the amplifier when the existing optical fiber signal amplifier is not used are solved.

A quantum repeater circuit can include a resource state interconnect circuit that outputs one resource state per clock cycle, with each resource state having a number of entangled qubits. The circuit can also include circuits and delay lines to perform entangling measurement operations on qubits of resource states generated by the same resource state generator in different clock cycles. The circuit can be operated as a quantum repeater that receives an encoded logical qubit and produces a reduced-noise version of the encoded logical qubit.