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186results about "Multiple station single light source" patented technology
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Optical line terminal, passive optical network and radio frequency signal transmission method
InactiveUS20100142955A1Additional wireless bandwidthPower spectrum is enhancedWavelength-division multiplex systemsMultiple station single light sourceMultiplexingAccess network
An optical line terminal, a passive optical network and a radio frequency signal transmission method in the communication technical field are provided. The passive optical network comprises: an OLT, an ODN and at least one ONU. The OLT comprises: at least one transmitting unit, which provides one dedicated downstream optical carrier and two dedicated upstream optical carriers for ONU; the two dedicated optical carriers for ONU are configured to carry ONU upstream radio frequency signals; a multiplexing / demultiplexing unit; and at least one receiving unit which obtains the upstream signal from the demultiplexed upstream optical signal. The bandwidth of wireless access network is enhanced, and the design of ONU is simple.
Owner:HUAWEI TECH CO LTD
Loop-back wavelength division multiplexing passive optical network
InactiveUS20060093360A1Eliminate power lossSimple structureWavelength-division multiplex systemsMultimode transmissionDriving currentAudio power amplifier
Disclosed herein is a loop-back Wavelength Division Multiplexing Passive Optical network (WDM-PON). The loop-back WDM-PON includes a coupler, a terminal receiver, and a reflective semiconductor amplifier. The coupler branches a downstream signal, which is transmitted from a central office, into first and second downstream signals. The terminal receiver receives and converts the first downstream signal into electrical signal and provides the electrical signal to a subscriber. The reflective semiconductor optical amplifier flattens modulated optical power of the second downstream signal input to the RSOA and re-modulating the flattened signal by changing driving current in response to upstream data.
Owner:ELECTRONICS & TELECOMM RES INST
Reflective semiconductor optical amplifier-based optical access network system having improved transmission quality
InactiveUS20080187314A1Improving not transmission qualityImprove transmission qualityWavelength-division multiplex systemsDistortion/dispersion eliminationAccess networkReflective semiconductor optical amplifier
Disclosed herein is an optical access network system in which the transmission quality of an upstream signal is remarkably improved in an optical access network in which a Reflective Semiconductor Optical Amplifier (RSOA) is used as the light source for each subscriber. The most important characteristics of the present invention are that a Manchester modulation format is used as a modulation format for a downstream signal in an optical access network system in which an RSOA is used as the light source for each subscriber, so that the problem of deterioration of the transmission quality of a remodulated upstream signal, occurring when an RSOA is used as the light source for each subscriber, is solved, and thus the transmission performance of an upstream signal and the power budget performance of the entire system are improved. According to the present invention, an RSOA-based WDM PON system, in which performance at a power budget and the transmission performance of a remodulated upstream signal are improved, can be implemented.
Owner:KOREA ADVANCED INST OF SCI & TECH
Passive Optical Network Based On Reflective Semiconductor Optical Amplifier
ActiveUS20090220230A1Increase powerIncrease input powerMultiplex system selection arrangementsTime-division optical multiplex systemsWavelength reuseReflective semiconductor optical amplifier
Provided is a passive optical network (PON) based on a reflective semiconductor optical amplifier (RSOA). In the PON, seed-light-injection RSOAs are used in an optical line terminal (OLT) to achieve the color-less management of the wavelengths of OLT optic sources, and wavelength reuse RSOAs are used to achieve the color-less management of the wavelengths of ONTs. Therefore, problems related to ONT wavelength management can be eliminated by the wavelength reuse RSOAs, and problems related to OLT wavelength management can be eliminated by the seed-light-injection RSOAs.
Owner:ELECTRONICS & TELECOMM RES INST
Dual-port broadband light source with independently controllable output powers
InactiveUS20050069252A1Increase output powerSatisfactory output efficiencyLaser output parameters controlActive medium materialBroadband light sourceAmplified spontaneous emission
A dual-port broadband light source with independently controllable output powers includes a broadband light source having a first gain medium pumped by an input pump light in order to output a first amplified spontaneous emission through both ends thereof. A second gain medium pumped by another input pump light in order to output a second amplified spontaneous emission through both ends thereof. A reflector disposed between the opposite ends of the first and second gain mediums to reflect the input first and second amplified spontaneous emissions. The first and second amplified spontaneous emissions output from the first and second gain mediums are then output to the outside through first and second output terminals.
Owner:SAMSUNG ELECTRONICS CO LTD
Centralized lightwave wdm-pon employing intensity modulated dowstream and upstream
ActiveUS20090274462A1Reduce phase noiseSimplify system complexityModulated-carrier systemsOptical multiplexData signalCarrier signal
An optical system and method includes a source-free optical network unit coupled to an optical fiber for receiving a centralized lightwave carrier signal with downstream data over the optical fiber. The optical network unit includes a coupler configured to split the original carrier signal into a first path and a second path. The first path includes an optical filter configured to reduce fading effects of the carrier signal. The second path includes a modulator configured to remodulate the centralized lightwave carrier signal with upstream data to produce an upstream data signal for upstream transmission.
Owner:NEC CORP
Methods and apparatus for electro-optical hybrid telemetry
InactiveUS20060152383A1Facilitates a single-fiber input/outputEasy inputSurveyConstructionsData transmissionElectric cables
Hybrid electrical-optical telemetry systems and methods are disclosed. The methods and systems facilitate faster data transmission rates between the surface and downhole tools and sensors. The methods and systems may also include a downhole electrical bus for inter-tool and intra-tool communication to facilitate limited changes to existing downhole equipment. Some embodiments of the hybrid electrical-optical telemetry system include a light source at the surface and a downhole modulator. Some embodiments also include redundant, selectable optical systems. The methods and systems may operate via a single optical input / output cable.
Owner:SCHLUMBERGER TECH CORP
Loop-back wavelength division multiplexing passive optical network
InactiveUS20060093359A1Sure easyElectromagnetic network arrangementsOptical multiplexMultiplexerEngineering
Disclosed herein is an apparatus and method for managing faults of a loop-back Wavelength Division Multiplexing Passive Optical Network (WDM-PON). The apparatus includes a control light source as well as a plurality of light sources in a central office, a loop-back means for transmitting control light to the central office through a remote node optical demultiplexer or remote node optical multiplexer in a remote node, a control light receiver for receiving looped-back control light, and a control unit for maintaining power of the upstream signals, which are received by central office receivers, and power of the control light, which is received by the control light receiver, at a maximum.
Owner:ELECTRONICS & TELECOMM RES INST
Wavelength division multiplexing-passive optical network (wdm-pon)
InactiveUS20110135309A1Eliminate lossEfficiently transmitting signalWavelength-division multiplex systemsMultimode transmissionMultiplexerWavelength division multiplexing passive optical networks
Provided is an Optical Line Terminal (OLT). The OLT may include a first Wavelength division multiplexer / demultiplexer (WDM MUX / DeMUX) to perform a wavelength demultiplexing on seed light received from a seed light source, and a second Wavelength division demultiplexer (WDM DeMUX) to receive, from at least one ONU / ONT, an upstream optical signal generated using the seed light having the wavelength demultiplexing performed, and to perform a wavelength multiplexing on the received upstream optical signal.
Owner:ELECTRONICS & TELECOMM RES INST
Portable wireless terminal for visible light communication
InactiveUS20080107419A1Enhanced advantageReflex reflectorsClose-range type systemsPhotoelectric conversionOpto electronic
A portable wireless terminal for performing visible light communication with other devices through free space includes an optical detector for generating an electrical signal after photoelectrically converting some of optical signal input from free space and outputting the electrical signal; a reflector for retro-reflecting the others of the optical signal incident on the concave grooves, the reflector having a reflection surface on which at least one concave groove is formed; and a modulator for outputting the retro-reflected optical signal after data modulation.
Owner:SAMSUNG ELECTRONICS CO LTD
Laser Source Based On Fabry-Perot Laser Diodes And Seeding Method Using The Same
Disclosed is directed to a laser source based on Fabry-Perot laser diodes (FP-LDs) and seeding method using the same. The laser source comprises a plurality of FP-LDs, an optical filter, and at least a fiber mirror. The FP-LDs are aligned to their corresponding filter modes of the optical filter, and output their optical spectrums. The optical spectrums are filtered via the optical filter then reflected into the FP-LDs. Each of the FP-LDs further outputs its optical spectrum with a form of continuous wave (CW) of single longitudinal mode (SLM). The outputted CWs may be treated as injected laser light sources. They may also be applied to the transmission architecture in wavelength-division-multiplexed passive optical networks.
Owner:IND TECH RES INST
Apparatus and method for olt and onu for wavelength agnostic wavelength-division multiplexed passive optical networks
ActiveUS20110026923A1Lowering in extinction ratioPossible to transmitLaser detailsWavelength-division multiplex systemsComputer terminalLength wave
In a Wavelength-Division-Multiplexed Passive Optical Network (WDM-PON) utilizing a conventional downstream optical signal reusing method, there is an inventory problem that different optical transmitter types need to be provided for the operation, management, replacement, etc. of a system. A WDM-PON system according to the present invention, includes: a seed light (SL) unit generating a seed light whose wavelength intervals and center wavelengths are adjusted using at least one seed light source; an optical line terminal (OLT) receiving the wavelength-multiplexed seed light from the seed light unit, transmitting a downstream optical signal to a subscriber of the WDM-PON, and receiving a upstream optical signal from the subscriber; and an optical network unit (ONU) receiving the downstream optical signal from the OLT, flattening and modulating the downstream optical signal with upstream data so that the downstream optical signal is reused for carrying upstream data. It is possible to improve the quality and reliability of downstream transmission by sufficiently increasing an extinction ratio, and improve the quality and reliability of upstream transmission by sufficiently flattening an input downstream optical signal in a semiconductor optical amplifier.
Owner:ELECTRONICS & TELECOMM RES INST
Large field of view modulating retro reflector (MRR) for free space optical communication
A modulating retro-reflector (MRR) can be configured to provide a large field of view. The MRR can include a solid corner cube reflector (CCR) manufactured of a material having a high index of refraction at the desired operating wavelength. CCRs made from high index materials such as InP or Si, have an index of refraction of approximately 3.48 at an operating wavelength of approximately 1550 nm and can provide a conical Field of View (FOV) of greater than ±60 degrees compared to less than ±30 degrees for CCRs made from BK-7. Each CCR can include one or more elements configured to modulate an optical signal incident on the CCR. A retro-modulating transponder can use fewer large FOV MRRs to support communication over a predetermined incident optical span compared to narrower FOV MRRs resulting in lower cost, smaller size, weight and power requirements.
Owner:CUBIC CORPORATION
Wavelength Division Multiplexed Passive Optical Network
ActiveUS20080279556A1Wavelength-division multiplex systemsMultimode transmissionIntensity modulationLaser beams
Data is transmitted between a central office and customer premises by a wavelength division multiplex passive optical network. Two laser beams with separate wavelengths are transmitted from the central office to an optical network unit in the customer premises. Both laser beams carry downstream data. One laser beam is intensity modulated by on / off keying. The other laser beam is phase modulated by differential phase shift keying, which maintains a constant optical intensity. The first laser beam is received by a first optical receiver, which demodulates the first downstream data. The second laser beam is split in two. One laser beam is sent to a second optical receiver, which demodulates the second downstream data. The other laser beam is sent to a reflective semiconductor amplifier, which modulates the beam with upstream data and transmits the beam back to a receiver in the central optical system.
Owner:NEC CORP
Optical modulating device
InactiveUS20060024066A1Reduce the impactStable amplifying functionLaser detailsWavelength-division multiplex systemsOptical isolatorSemiconductor
An optical modulation apparatus is provided which implements a stable amplifying function by reducing the effect of reflected light rays form end faces of a bidirectional optical amplifier by imposing a numerical limitation on the relationship between the gain of the bidirectional optical amplifier and the loss of the optical modulator, or by inserting a polarization rotation section in a reflection type optical modulator including the bidirectional optical amplifier or in a multi-wavelength collective optical modulation system combining the multiple optical modulators. An optical modulation apparatus is provided which implements a stable amplifying function and cost reduction by reducing the effect of reflected light rays by interposing optical isolators at every alternate SOAs in a transmission-type optical modulation apparatus including a plurality of semiconductor optical amplifiers (SOAs) connected in a multistage fashion.
Owner:NIPPON TELEGRAPH & TELEPHONE CORP
Eliminating ONU laser for WDM PON by burst mode
InactiveUS20060140642A1Electromagnetic transmittersMultiple station single light sourceData signalSignal modulation
Tuned lasers in the ONU's are eliminated in WDM PON by use of a burst mode transmission. An apparatus for communicating over a passive optical network comprises a transmitting portion operable to generate an optical signal comprising a first portion modulated with a first data signal and a second portion that is unmodulated and to transmit the optical signal over the passive optical network and a receiving portion operable to receive an optical signal comprising the second portion of the transmitted optical signal modulated with a second data signal.
Owner:FUJITSU LTD
Retromodulation-based data communication
A data communication system comprising a transceiver unit for retromodulated optical communication with at least one of a plurality of retromodulator units, the transceiver unit comprising at least one of a plurality of transceivers, the transceivers transmitting diffused radiant energy at different angles covering a predetermined three-dimensional area, wherein each transceiver is enabled to set up and execute communication with at least one retromodulator unit located within its coverage area. Furthermore, a retromodulator comprising multiple arrays of lenslets or spherically arranged lenslets is provided for achieving a wide angle of acceptance. Further more a number of novel applications based on the data communication system are provided, including a remote wireless network connection for a portable computing device, a smart card for remote wireless identification, remote data collection, and remote downloading of digital photographs.
Owner:IRALINK
Wavelength-division-multiplexed passive optical network system using wavelength-seeded light source
InactiveUS20050074240A1Wavelength-division multiplex systemsMultimode transmissionWdm optical networksSingle strand
An economical wavelength-division-multiplexed passive optical network (WDM-PON) system is realized by directly modulating a wavelength-seeded light source to transmit upstream or downstream data, without using an expensive external modulator. A multiplexed signal having the same wavelength as the waveguide grating is generated and used to control the temperature of the waveguide grating and adjust the wavelength of a wavelength-division-multiplexed signal routed to a transfer link. The wavelength selectivity and stabilization of each light source are not required. Since upstream and downstream signals can be multiplexed and demultiplexed concurrently by each waveguide grating located in the central office and the remote node, it is possible to reduce the number of waveguide gratings used in a WDM optical network. In addition, upstream and downstream signals can be transmitted concurrently using a single-strand transfer optical fiber, thereby realizing an economical and efficient WDM-PON.
Owner:SAMSUNG ELECTRONICS CO LTD
Method and System for Single Laser Bidirectional Links
A method and system for single laser bidirectional links are disclosed and may include communicating a high speed optical signal from a transmit CMOS photonics chip to a receive CMOS photonics chip and communicating a low-speed optical signal from the receive CMOS photonics chip to the transmit CMOS photonics chip via one or more optical fibers. The optical signals may be coupled to and from the CMOS photonics chips utilizing single-polarization grating couplers. The optical signals may be coupled to and from the CMOS photonics chips utilizing polarization-splitting grating couplers. The optical signals may be amplitude or phase modulated. The optical fibers may comprise single-mode or polarization-maintaining fibers. A polarization of the high-speed optical signal may be configured before communicating it over the single-mode fibers. The low-speed optical signal may be generated by modulating the received high-speed optical signal or from a portion of the received high-speed optical signal.
Owner:CISCO TECH INC
Optical network terminal and wavelength division multiplexing based optical network having the same
InactiveUS20050123298A1Solve the power is smallLow costWavelength-division multiplex systemsMultiple station single light sourceData controlNetwork termination
Disclosed is a loop-back optical network terminal using a Febry-Perot laser diode as an active type optical modulator in a wavelength division multiplexing based optical network. In addition, a wavelength division multiplexing based optical network having the same is disclosed. The optical network terminal comprises a modulation timing control signal generator receiving a downstream optical signal transmitted from a central office and generating a timing control signal designating a start timing and an end timing for modulating an upstream optical signal to be transmitted from a user to the central office; an upstream data control circuit generating upstream data according to the timing control signal and controlling modulation of the upstream optical signal according to the timing control signal in response to generation of the upstream data; and a modulator receiving the upstream data and directly modulating the upstream data with loop-backing the downstream optical signal to produce the upstream optical signal and then output it to the central office.
Owner:ELECTRONICS & TELECOMM RES INST
Laser array mux assembly with external reflector for providing a selected wavelength or multiplexed wavelengths
ActiveUS20130016977A1Wavelength-division multiplex systemsSemiconductor lasersLaser transmitterMultiplexing
A laser array mux assembly generally includes an array of laser emitters coupled to an optical multiplexer, such as an arrayed waveguide grating (AWG), with an external partial reflector after the multiplexer. Each of the laser emitters may include a gain region that emits light across a range of wavelengths including, for example, channel wavelengths in an optical communication system. The AWG filters the emitted light from each of the laser emitters at different channel wavelengths associated with each of the laser emitters. The reflector reflects at least a portion of the filtered light such that lasing occurs at the channel wavelengths of the reflected light. The laser array mux assembly may be used to generate an optical signal at a selected channel wavelength or to generate and combine optical signals at multiple channel wavelengths.
Owner:APPLIED OPTOELECTRONICS
Optical line terminal, passive optical network and radio frequency signal transmission method
InactiveCN101399618ASimple designTake advantage ofWavelength-division multiplex systemsMultiple station single light sourceMultiplexingRadio frequency signal
Owner:HUAWEI TECH CO LTD
Optical communication system with cats-eye modulating retro-reflector (MRR) assembly, the cats-eye mrr assembly thereof, and the method of optical communication
InactiveUS20070297805A1Reduce field of viewMultiple station single light sourceCommunications systemModulating retro-reflector
An optical communicating system and method thereof includes first and second terminals. The first terminal has a transmitter for transmitting an interrogating light beam and a receiver for receiving the interrogating light beam. The second terminal has a cats-eye modulating retroreflector (MRR), which includes a modulator for modulating the interrogating light beam received from the transmitter an optical focusing device for focusing the interrogating light beam from the transmitter to the modulator, and a reflector for reflecting the modulated light beam to the receive. It can include a beam deflector positioned at the aperture of the optical focusing device of the catseye MRR to reduce the field of view of the cats-eye MRR, It can also include an angle of arrival sensor for sensing the angle of arrival of the interrogating beam at the second terminal. One or more pixels of the modulator can be activated to permit the activated pixel(s) to modulate the interrogating beam, which is reflected back to the receiver, and the beam deflector both can be controlled based on the angle of arrival detected
Owner:RABINOVICH WILLIAM +1
Medium access control for retro-reflectors
A method, a device and a system for communications to and from a retro-reflector device (302) is provided. The retro-reflector device (302) receives a first frame (400) encoded in an input beam (106). The retro-reflector device (302) creates and sends a second frame (420) in a first reflected beam (108) formed by the retro-reflector device (302) reflecting the input beam (106) along a path closely aligned with a path of the input beam. At least one of the first frame (400) and the second frame (420) includes medium access control information. In some implementations, the first frame (400) may include a data throughput rate (404, 406), a preamble (402) and an error correction code (412).
Owner:RAYTHEON BBN TECH CORP
Techniques for controlling a light source in a wavelength division multiplexed passive optical network
ActiveUS20100316386A1Wavelength-division multiplex systemsTransmission monitoringDigital signal processingAudio power amplifier
Techniques for controlling a light source in a wavelength division multiplexed passive optical network (WDM-PON) are disclosed. In one particular exemplary embodiment, the techniques may be realized as an apparatus for controlling a light source in a wavelength division multiplexed passive optical network (WDM-PON). The apparatus may include a digital signal processing device configured to output a pilot tone signal. The apparatus may also include an amplifier configured to modulate a modulation current and the pilot tone signal, and output an amplitude modulated signal. The apparatus may further include a capacitor configured to AC couple the amplitude modulated signal to a bias current applied to a light source; and a monitoring photodiode configured to detect an output optical signal of the light source and transmit the detected output optical signal to the digital signal processing device to control the output optical signal of the light source.
Owner:LG ERICSSON
Secure optical communication
ActiveUS7796896B2Reduce riskExtended durationSecret communicationUsing optical meansCoherence timePhase modulation
A secure optical communication scheme uses differential delay D in an unbalanced Mach-Zehender interferometer to provide two copies of the optical source signal at a remote phase modulator separated in time by D. As D is much bigger than the coherence time source, the two copies of the signal are effectively uncorrelated. Both signals are phase-modulated by the remote sender's data and returned to the unbalanced interferometer. The phase modulator will be converted into amplitude modulation by the action of the interferometer.
Owner:BRITISH TELECOMM PLC
Microwave signal photonic frequency conversion and multichannel fiber transmission device and method
ActiveCN106656335ALow costEasy to adjustDistortion/dispersion eliminationRadio-over-fibreErbium dopingPolarization multiplexed
The invention discloses a microwave signal photonic frequency conversion and multichannel fiber transmission device and method realized by a polarization multiplexing modulator. The device, as shown by a figure, comprises a laser diode (LD), a polarization multiplexing Mach-Zehnder modulator (PDM-MZM), an erbium doped fiber amplifier (EDFA), a 1:N light splitter (Splitter), a polarizer (Pol), a polarization controller (PC), and a standard single-mode fiber (SMF) and a photoelectric detector (PD). The PDM-MZM is used to carry out carrier suppressed double side band modulation on radio frequency (RF) and local oscillation (LO) signals and then implement frequency mixing, and the RF and LO isolation degree of frequency conversion gain and frequency conversion signals is improved. Optical signals output by the modulator can be divided into multiple paths to implement fiber transmission, each path is adjusted via an independent polarization state, and power attenuation caused by dispersion can be compensated.
Owner:XIDIAN UNIV +1
Optical wireless multiport hub
An optical communication transmitter (13), receiver (15), and transceiver (17) having distinctive retro-reflective elements (30) and / or reflectivity that can be modulated. In one embodiment, the retro-reflective elements (30) can have different shapes or patterns (32), irrespective of rotation or size. In another embodiment, the retro-reflective elements can have their reflectivity modulated (42) to have a distinctive pattern in time. The solution also provides the capability to direct a remote optical receiver (15) to an available port (17) with an appropriate FOV. In the case where retro-reflective elements are only shape distinctive, a method may be used to direct the remote OWLink (15) to an appropriate port (17) of the hub (54). In addition to the hub ports (17) used for data links, additional hub ports called command ports (60) are added that are only used during the initial link setup of remote units. The hub (54) contains enough command ports (60) such that one command port covers each possible FOV. All command ports contain the same retro-reflective element shape that is very distinct from other hub shapes, e.g. the largest.
Owner:TEXAS INSTR INC
External cavity laser and WDM-PON (Wavelength Division Multiplex-Passive Optical Network) system
ActiveCN102136674ASolve the problem of unstable output optical powerMultiplex system selection arrangementsLaser detailsExternal cavity laserOptical power
The embodiment of the invention discloses an external cavity laser, relating to the technical field of WDM-PON (Wavelength Division Multiplex-Passive Optical Network) and effectively solving the problem, i.e. the output optical power of the external cavity laser is instable, caused by polarization dependence. The external cavity laser comprises a gain medium, a filter and a Faraday rotary reflector which form an oscillation cavity, and light emitted by the gain medium repeatedly oscillates in the oscillation cavity.
Owner:HUAWEI TECH CO LTD
Centralized lightwave WDM-PON employing intensity modulated downstream and upstream
ActiveUS8131156B2Reduce phase noiseReduce line widthModulated-carrier systemsOptical multiplexCarrier signalData signal
Owner:NEC CORP
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