202results about "Electromagnetic repeaters" patented technology

The invention discloses a ship-shore safety connection system with efficient communication and safety protection, and particularly relates to the technical field of electric power and data connection of ships and shore bases, which comprises a medium-voltage composite optical fiber shore power cable, a dual-system electrical transmission system, a third-party linkage control center and a layered insulation monitoring module, the medium-voltage composite optical fiber shore power cable adopts a double-layer anti-torsion protective sleeve and an anti-electrostatic shielding layer, a double-system electrical transmission system is integrated with a broadband voltage self-adaptive module and a high-speed optical fiber communication repeater, the system realizes ship-shore potential difference monitoring and redundancy switching through a three-way data link, and a layered insulation monitoring module is used for positioning a fault point in real time. Besides, an environment reinforcing assembly, a multi-stage early warning mechanism and a communication line self-healing function are further arranged, the problems that a traditional system is poor in compatibility, low in communication efficiency and insufficient in safety protection are solved, and the system is suitable for efficient and safe connection between the ship and the shore base.

A self-aligning window mounted communication apparatus is discussed herein. In some examples, a wireless gateway may comprise a first unit to be mounted outside a window and a second unit to be mounted inside the window. A first unit and a second unit may each include an optical unit, a coupling unit, and a housing unit. A first optical unit may include a magnetic array with polarities of the magnetic elements configured to orient with a second optical unit in a single orientation. The optical unit(s) may be movably coupled with the respective coupling unit(s) so that the optical unit may move with various degrees of freedom and thus, when the first and second units are mounted on a window, the optical units can self-align based on the respective magnetic arrays and the degrees of freedom afforded by the movable coupling with the coupling unit.

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.

An optical transmission system includes a transceiver configured to output an optical signal to a first optical fiber core, wherein the first optical fiber core is configured to reflect a portion of the optical signal back toward the transceiver. The optical transmission system further includes a second optical fiber core proximate the first optical fiber core, wherein the second optical fiber core is configured to receive crosstalk of the reflected portion of the optical signal from the first optical fiber core. The optical transmission system further includes a detector configured to receive the crosstalk of the reflected portion of the optical signal and generate detection data based on the crosstalk of the reflected portion of the optical signal. The optical transmission system further includes a controller configured to receive information related to the detection data, and determine whether the optical transmission system is functioning properly based on the detection data.

The invention relates to the technical field of optical fiber communication, and discloses an optical fiber optical frequency relay transmission system and method without a phase-locked loop. The optical fiber optical frequency relay transmission system comprises multiple stages of relay stations which are sequentially cascaded through an optical fiber transmission link, and for each stage of relay station, a first photoelectric detector is used for carrying out beat frequency processing on a current-stage optical frequency signal sent by a current-stage regeneration cavity-stabilized laser and an optical frequency signal received from a previous-stage relay station; frequency mixing and summation are carried out on the current-level beat frequency signal and an optical frequency signal transmitted by an upper-level relay station through the data interaction unit, so that noise accumulation generated in a signal transmission process in a traditional phase-locked loop scheme can be thoroughly eliminated; therefore, the noise item in the optical frequency signal output to the user side is completely counteracted, that is, the high-precision original optical frequency signal is provided for the user side, and long-distance and high-precision optical frequency transmission can be realized on the basis of reducing the complexity of system design.

The invention discloses an optical fiber relay aircraft, a drive-by-wire unmanned aerial vehicle system and a flight control method and device, relates to the technical field of unmanned aerial vehicle communication, and aims to solve the problem that the maneuverability of a drive-by-wire unmanned aerial vehicle is poor due to the fact that optical fibers are limited by terrains or obstacles. The optical fiber relay aircraft is connected with the drive-by-wire unmanned aerial vehicle through an optical fiber, the optical fiber relay aircraft comprises a connecting device, and the connecting device is connected with the optical fiber and used for lifting the optical fiber along with the optical fiber relay aircraft and hovering the optical fiber in the air. The drive-by-wire unmanned aerial vehicle system comprises a drive-by-wire unmanned aerial vehicle and the optical fiber relay aircraft, and the drive-by-wire unmanned aerial vehicle and the optical fiber relay aircraft are connected through an optical fiber. According to the embodiment of the invention, the drive-by-wire unmanned aerial vehicle can fly flexibly in a complex environment.

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.

The present application provides a secure repeater-based quantum communication method and communication network. Said method comprises a transmitter encrypting plaintext information to be sent, to obtain ciphertext; the transmitter sending the ciphertext to a repeater node by means of a quantum communication protocol, so as to send the ciphertext to a receiver by means of at least one repeater node; and after receiving the ciphertext, the receiver decrypting the ciphertext to obtain the plaintext information. The ciphertext is transmitted step by step by means of the at least one repeater node, which is not limited to the distance between the transmitter and the receiver, so that the ciphertext can be transmitted over a long distance. Furthermore, before arriving at the receiver, the plaintext information is transmitted in the form of a ciphertext and is decrypted on the fly, thereby reducing the risk of information being eavesdropped, improving the security.

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 aspect of the present invention is an optical transmission system in which one or more optical transmitters and one or more optical receivers perform communication via an optical transmission path, the optical transmission path including a plurality of relay nodes including optical amplifiers that amplify optical signals, the one or more optical transmitters transmitting optical signals at a plurality of channel frequencies, the one or more optical receivers estimating variations in intensities of the optical systems on the optical transmission path for each of the plurality of channel frequencies, the optical transmission system including: a network controller that acquires estimation information indicating a result of estimating the variations from the one or more optical receivers and acquires gain spectra of the optical amplifiers in the optical transmission path on the basis of the acquired plurality of pieces of estimation information.

A method includes: outputting optical signals to a first optical fiber via a first interrogator, the first interrogator located at a topside / onshore location, the first interrogator configured to collect distributed acoustic sensor (DAS) and / or distributed temperature sensor (DTS) measurements; outputting optical signals to a second optical fiber via a second interrogator, the second interrogator located subsea, the second interrogator configured to collect DAS and / or DTS measurements; receiving optical signals from the second optical fiber via the first interrogator; receiving optical signals from the first optical fiber via the second interrogator; providing acoustic, temperature, and / or vibration sensing along a portion of the second optical fiber via the first interrogator based on the optical signals received from the second optical fiber; and providing acoustic, temperature, and / or vibration sensing along a portion of the first optical fiber via the second interrogator based on the optical signals received from the first optical fiber.

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.

An optical signal repeater where an upstream modulator is configured to generate an optical upstream output signal by modulating an optical carrier signal, and to transmit the optical upstream output signal to an upstream fibre-optic output port. A downstream modulator is also configured to generate an optical downstream output signal by modulating an optical carrier signal and to transmit the optical downstream output signal to a downstream fibre-optic output port. By ensuring that the wavelengths of the optical carrier signals are equal or substantially equal, the wavelength drift in the upstream direction can be kept equal to the drift in the downstream direction. These repeaters can be used for time and frequency synchronization in long-distance fibre-optic networks.

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.

To provide an optical transmission system and a method for determining whether the optical transmission system is functioning properly.SOLUTION: An optical transmission system includes a transceiver configured to output an optical signal to a first optical fiber core of a multicore fiber (MCF), a second optical fiber core proximate to the first optical fiber core within the MCF, configured to receive crosstalk of reflected portions of the optical signal from the first optical fiber core, a detector configured to receive the crosstalk of the reflected portions of the optical signal and generate detection data based on the crosstalk of the reflected portions of the optical signal, and a controller configured to receive information related to the detection data and determine whether the optical transmission system is functioning properly based on the detection data.SELECTED DRAWING: Figure 1

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.