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59 results about "Delay line interferometer" patented technology
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A delay line interferometer (DLI) can be a Mach–Zehnder interferometer or Michelson interferometer based on two-beam interference, in which one beam is time-delayed to the other by a desired interval.
Feedback control of an interferometer
InactiveUS20050088659A1Signal distortionOptical measurementsUsing optical meansControl signalOptical data transmission
The invention proposes a method for feedback control, in which a portion of a data signal is split and rectified and the signal intensity is detected with slow speed electronics for improving the control of a delay line interferometer (DLI) used in optical data transmission. A control signal is generated and fed back to the DLI based on the detected signal intensity. The invention further proposes a device provided with a DLI, a first and second optoelectronic component, and a differential amplifier.
Owner:RPX CORP +1
Control of delay line interferometer
ActiveUS7266311B2Low costCounting errorTransmission monitoringPhase-modulated carrier systemsSignal-to-noise ratio (imaging)Phase shifted
The delay setting of an optical delay line interferometer (DLI) used to decode differentially encoded phase shift keyed signals (DPSK or DQPSK) is controlled using a control signal representative of the ratio Perr2 / Perr1 of the rate of occurrence of double errors and the rate of occurrence of errors. The ratio Perr2 / Perr1, as the delay setting of the DLI is varied, exhibits a characteristic W-shaped structure consisting of a local maximum at the optimum value and two minima adjacent to the maximum, one on each side of it. This structure is present over a wide range of signal to noise ratio and residual dispersion.
Owner:RPX CORP +1
Mzm linear driver for silicon photonics device characterized as two-channel wavelength combiner and locker
The present invention includes a Mach-Zehnder modulator (MZM) linear driver configured in a differential form with two waveguides carrying two traveling waves which supports a two-channel spectral combiner integrated with a wavelength locker. By coupling a DC current source supplied with a modulation voltage with each segment thereof for providing electrical modulation signal overlapping with each of the two traveling waves. The modulated traveling waves in the two waveguides then are combined in one output signal by a multimode interference coupler. Two optical signals at ITU grid channels are separately modulated by two MZMs and combined into a silicon waveguide-based delayed-line interferometer built on a SOI substrate to produce an output signal having a free spectral range equal to twice of the spacing of the two ITU grid channels. Two dither signals can be added respectively to the two optical signals for identifying and locking corresponding two channel wavelengths.
Owner:MARVELL ASIA PTE LTD
Delay line interferometer having a stepped delay element
InactiveUS20080225381A1Maximize differenceError preventionElectromagnetic transmissionSignal transfer functionPhase control
An optical receiver apparatus and methods for mitigating intersymbol interference (ISI) in a differentially-encoded modulation transmission system by controlling constructive and destructive transfer functions. The receiver includes a bandwidth control element for controlling transfer function bandwidth, a transfer phase controller for controlling transfer function phase and / or an imbalancer for imbalancing the transfer functions for compensating for intersymbol interference and optimizing the quality of the received optical signal.
Owner:OPNEXT SUBSYST
Optical delay line interferometer
ActiveUS7899279B2Eliminate dependenceSimple configurationLight demodulationElectromagnetic receiversDifferential phasePolarization coupling
A demodulator is provided for a multilevel differential phase shift keyed signal, capable of eliminating polarization dependence due to birefringence and polarization coupling-induced light resulting from a waveguide structure, and also, polarization dependence due to dynamic birefringence produced at the time of driving a variable phase adjuster. The demodulator is configured of an optical delay line interferometer of a waveguide interference type. The S / N ratio of a demodulated signal in the demodulator formed by the optical delay line interferometer can be also improved. Further, both the polarization dependence and the temperature dependence of the optical delay line interferometer can be reduced. The disposition of a polarization converter and groves filled with a temperature compensation material makes it possible to provide a circuit configuration suitable for eliminating the polarization dependence and the temperature dependence of the optical delay line interferometer.
Owner:NIPPON TELEGRAPH & TELEPHONE CORP
Sagnac delay-line interferometer for DPSK demodulation
InactiveUS8270067B1Lower requirementUsing optical meansElectromagnetic transmittersBeam splitterLight beam
A DPSK demodulator is implemented in Sagnac interferometer configuration with a delay line element introduced in one or both of the optical paths of the transmitted and reflected beams. Because the two reflected and transmitted beams travel on the same optical path (though in opposite directions), the Sagnac interferometer provides all the advantages of a common-path interferometer, is thermally and mechanically stable, and the phase requirements are greatly reduced. In its simplest form, the Sagnac DPSK demodulator. In the preferred embodiment, the beam-splitting surface and one of the mirrors are combined into a rhomb beam-splitter structure and the other two mirrors into a right-angle prism. In a DQPSK embodiment, the input beam is split by an upfront beam splitter into two parallel beams that are then directed toward the rhomb-beam-splitter / right-angle-prism combination of the invention.
Owner:OPTOPLEX CORP
Michelson interferometer based delay line interferometers
InactiveUS20070070505A1Low and high coefficientElectromagnetic transmissionOptical elementsLight beamData rate
An interferometer includes a means for splitting, at a splitting location, an input light beam into a first beam and a second beam; and means for recombining, at a recombination location, the first beam and the second beam. The interferometer is designed such that the first beam will travel a first optical path length (OPL) from the splitting location to the recombination location, and the second beam will travel a second OPL from the splitting location to the recombination location and such that when the input light beam has been modulated at a data rate comprising a time interval, then the difference in optical path lengths between the first OPL and the second OPL is about equal to the time interval multiplied by the speed of light.
Owner:OPTOPLEX CORP
Wavelength control of two-channel DEMUX/MUX in silicon photonics
ActiveUS9325419B1Wavelength-division multiplex systemsElectromagnetic transceiversTransceiverPhotonics
Method and devices of controlling wavelengths in two-channel DEMUX / MUX in silicon photonics are provided. The two-channel DEMUX / MUX includes a waveguide-based delay-line-interferometer at least in receiver portion of a two-channel transceiver for DWDM optical transmission loop and is configured to split a light wave with combined two-wavelengths into one light wave with locked one channel wavelength and another light wave with locked another channel wavelength. The waveguide-based delayed-line interferometer (DLI) is characterized by a free-spectral-range configured to be equal to twice of channel spacing. The method includes tuning heater of DLI in receiver of each two-channel transceiver by using either low-frequency dither signals added on MZMs associated with respective two channels as feedback signal or one DFB laser wavelength tapped from an input of transmitter portion at one channel before or after the MZMs as a direct wavelength reference to feed into an output of receiver portion at another channel.
Owner:MARVELL ASIA PTE LTD
Delay line interferometer with liquid crystal tuning element
InactiveUS20120044565A1Reduce frequencyEasy to adjustStatic indicating devicesLight demodulationPhase differenceEngineering
A delay line interferometer is configured with a liquid-crystal (LC) tuning element as a phase modulator for demodulating a phase-modulated input signal. The LC tuning element allows for quickly tuning the phase difference between two optical signals separated from the phase-modulated input signal, so that the two optical signals can be coherently recombined to interfere with each other and produce one or more intensity-modulated optical signals. In some embodiments, the LC tuning element is configured to reduce polarization-dependent frequency shift without the use of additional high-precision optical elements and / or coatings.
Owner:II VI DELAWARE INC
Interferometer, demodulator, and optical fiber communication module
ActiveUS20100329667A1Stable demodulated signalEasy to assembleModulated-carrier systemsPolarising elementsBeam splitterLight beam
In a delay line interferometer inside a demodulator, with respect to polarization states of two split beams of light to be interfered with each other, p polarization and s polarization are reversed by a half beam splitter and, further, again multiplexed by the half beam splitter used for splitting so that interference beams of light are generated.
Owner:LUMENTUM JAPAN INC
Interferometer, demodulator, and optical communication module
ActiveUS20110188850A1Minimize strokeFaster in optical phase modulation speedMaterial analysis by optical meansPhotoelectric discharge tubesPhase differencePiezoelectric actuators
When designing a demodulator for a DPSK-modulated signal, it is required that optical phase modulation is performed fast and the demodulator has a long lifetime. To achieve this object, a delay line interferometer inside the demodulator performs adjustment of phase difference between two split lights caused to interfere, using a first optical phase modulation unit such as a Piezo actuator and a second optical phase modulation unit such as a heating element that operates slower in modulation speed than the first optical phase modulation unit and is slower in deterioration speed.
Owner:LUMENTUM JAPAN INC
All-optical methods and systems
InactiveUS20070071449A1Reduced pattern dependenceGood suitElectromagnetic repeatersInstrumentsShift registerOn-off keying
An all-optical modulation format converter for converting optical data signals modulated in an on-off-keying (OOK) format to a phase-shift-keying (PSK) format. The OOK-to-PSK converter can be coupled to a delay-line interferometer to provide an all-optical wavelength converter for differential PSK (DPSK). The OOK-to-PSK converter can also be used in all-optical implementations of various functions, including, for example, exclusive-OR (XOR) logic, shift registers, and pseudo-random binary sequence (PRBS) generators.
Owner:WSOU INVESTMENTS LLC
Monolithically integrated multi-wavelength differential quadrature phase shift keying (DQPSK) demodulator and manufacturing method thereof
InactiveCN101980460ARealize demodulationAchieve phase shiftPhase-modulated carrier systemsLight demodulationDifferential quadrature phase shift keyingEngineering
The invention relates to a monolithically integrated multi-wavelength differential quadrature phase shift keying (DQPSK) demodulator and a manufacturing method thereof. The demodulator is provided with a 1*D wavelength division demultiplexer and D DQPSK demodulators which are integrated on the same waveguide substrate to form a waveguide structure chip. The method comprises the following steps of: monolithically integrating the wavelength division demultiplexer AWG and a plurality of multi-wavelength optical DQPSK demodulators with delay line interferometers on the same waveguide substrate by planar optical waveguide technology to manufacture the waveguide structure chip; manufacturing a metal film micro-heater on one of two arms of each optical delay line interferometer forming the DQPSK demodulator by a photoetching, sputtering and stripping semiconductor process to realize phase control; adhering a thermoelectric cooler (TEC) to a chip substrate to control the temperature of the whole chip; and respectively connecting the metal film micro-heater and the TEC with an error signal from a control feedback loop. The DQPSK demodulator has low cost, the process is simple and the method contributes to mass production.
Owner:GUANGXUN SCI & TECH WUHAN
Feedback control of an interferometer
The invention proposes a method for feedback control, in which a portion of a data signal is split and rectified and the signal intensity is detected with slow speed electronics for improving the control of a delay line interferometer (DLI) used in optical data transmission. A control signal is generated and fed back to the DLI based on the detected signal intensity. The invention further proposes a device provided with a DLI, a first and second optoelectronic component, and a differential amplifier.
Owner:RPX CORP +1
Optical transmitter with hybrid modulation format
InactiveCN103607245AMeet the environmentMeet needsElectromagnetic transmissionFrequency spectrumQam modulation
The invention provides an optical transmitter with a hybrid modulation format. The optical transmitter is applied to a passive optical access network and a long-distance optical transmission system, wherein the passive optical access network is formed by integrating a wavelength division multiplexer and an optical branching device. The optical transmitter comprises an I / Q modulator 1, an I / Q modulator 2, a delay line interferometer and a Mach-Zehnder modulator. The I / Q modulator 1 is in cascade connection with the delay line interferometer, then is in cascade connection with the I / Q modulator 2 and lastly, is in cascade connection with the Mach-Zehnder modulator. The two I / Q modulators are respectively provided with two data input ports, and the Mach-Zehnder modulator is provided with one data input port. The optical transmitter is controlled to output an optical signal with the self-adaptation hybrid modulation format by controlling the on-off and the signal amplitude of the data input ports and the bit and the phase position delay of the delay line interferometer. By means of the optical transmitter, QPSK modulation, 8 QAM modulation and circular 16 QAM modulation can be achieved, and hybrid transmission formed by various modulation formats in any proportional mode can also be achieved. The optical transmitter can be applied to complex transmission links under the wavelength division multiplexing passive optical network environment, and the frequency spectrum utilization efficiency can be effectively improved.
Owner:HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
Pseudo common-path DPSK demodulator
ActiveUS8004749B1Reduce sensitivitySimple manufacturing processUsing optical meansElectromagnetic transmittersBeam splitterOptical path length
A rhomb beam splitter, rather than a conventional cube, is used in combination with a mirror reflecting both the reflected and transmitted beams to obtain a delay-line interferometer demodulator with a substantially common path. This significantly reduces the sensitivity of the device to environmental changes and also greatly simplifies the manufacture process. A polarization-insensitive coating or a wave plate, a thermal phase tuner with a micro-heater, and two compensator plates are used in the paths of the beams to balance the optical path lengths and to compensate for polarization and environmental effects.
Owner:OPTOPLEX CORP
Michelson interferometer based delay line interferometers
An interferometer includes a means for splitting, at a splitting location, an input light beam into a first beam and a second beam; and means for recombining, at a recombination location, the first beam and the second beam. The interferometer is designed such that the first beam will travel a first optical path length (OPL) from the splitting location to the recombination location, and the second beam will travel a second OPL from the splitting location to the recombination location and such that when the input light beam has been modulated at a data rate comprising a time interval, then the difference in optical path lengths between the first OPL and the second OPL is about equal to the time interval multiplied by the speed of light.
Owner:OPTOPLEX CORP
Integrated two-channel spectral combiner and wavelength locker in silicon photonics
InactiveUS20160127070A1Wavelength-division multiplex systemsOptical light guidesSilicon photonicsPhotonics
A two-channel DWDM spectral combiner integrated with a wavelength locker is provided. Two optical signals at ITU grid channels are separately modulated by MZM modulators and combined into a silicon waveguide-based delayed-line interferometer built on silicon-on-insulator substrate to produce a combined signal having a free spectral range equal to twice of the spacing of the two ITU grid channels. Two dither signals can be added respectively to the two optical signals for identifying corresponding two channel wavelengths and locking each wavelength while outputting the combined signal.
Owner:INPHI
Optical frequency stabilizer using optical fiber delay line, and method for generating stable optical frequency signal
ActiveUS20200091673A1Excellent competitive priceImprove mechanical stabilityWavelength-division multiplex systemsActive medium shape and constructionFrequency stabilizationControl signal
A frequency stabilizer includes: a delay line interferometer that receives an optical signal corresponding to one frequency mode of a pulsed laser, divides and transmits the received optical signal to a reference arm and a delay arm including an optical fiber delay line, and then outputs an interference signal between signals passing through the reference arm and the delay arm; a photoelectric converter that converts the interference signal into an electrical signal; a mixer that generates a baseband signal of the electrical signal by mixing a carrier frequency signal; and a feedback controller that transmits a control signal generated based on the baseband signal to the pulsed laser. The optical signal passing through the delay arm is weighted with a delay time caused by the optical fiber delay line compared to the optical signal passing through the reference arm, and the optical signal passing through the delay arm is frequency shifted to a carrier frequency of an oscillator. A carrier-envelope offset frequency of the pulsed laser is stabilized by an offset frequency stabilizer.
Owner:KOREA ADVANCED INST OF SCI & TECH
Narrow-band DPSK apparatus, system, method
InactiveUS20110052196A1Attenuation bandwidthReduce the crosstalk in the transmittersWavelength-division multiplex systemsPhase-modulated carrier systemsPath lengthEngineering
System, apparatus and methods are provided for optical communication which tolerates the tight filtering effects from concatenation of reconfigurable optical add drop multiplexers (ROADMs). An exemplary system includes a receiver configured to receive a Narrow-Band Differential-Phase-Shift-Keyed (NB-DPSK) optical signal. The receiver includes a Delay Line Interferometer (DLI) with a path length difference of less than approximately one bit period and a detector for detecting DLI output to form an electrical signal. The bandwidth of the NB-DPSK optical signal is less than approximately one-half of a first bit rate of a transmitter from which the NB-DPSK optical signal is received. The electrical signal is processed to decode transmitted data. A corresponding transmitter amplifies a first input signal having a first bit rate; and drives a DPSK modulator after amplification to generate the NB-DPSK optical signal, which has a bandwidth less than approximately one-half of the first bit rate.
Owner:ALCATEL LUCENT SAS
Temperature insensitive DEMUX/MUX in silicon photonics
ActiveUS9553689B2Wavelength-division multiplex systemsOptical light guidesMultiplexingSilicon photonics
A temperature insensitive DEMUX / MUX device whose wavelength does not change by environment temperature is provided for WDM application. The temperature insensitive DEMUX / MUX device includes a waveguide-based delay-line-interferometer configured to receive an input light bearing multiplexed wavelengths and output a first output light bearing the same multiplexed wavelengths but with a shifted intensity peak position. The first output light is transmitted into a DEMUX device through a first free space coupler and a grating fiber or waveguide to be demultiplexed for forming a plurality of second output lights each bearing an individual wavelength. The DEMUX device includes a second free space coupler for refocusing each second output light to corresponding output channel. The shifted intensity peak position of the first output light is tunable to make each second output light free from any temperature-induced drift off corresponding output channel.
Owner:MARVELL ASIA PTE LTD
Wavelength locker integrated with a silicon photonics system
ActiveUS10056733B1Increase data rateLaser detailsLaser optical resonator constructionFrequency spectrumSilicon photonics
A wavelength locker integrated with a silicon photonics transmission system comprising a silicon-on-insulator (SOI) substrate and an input via a power tap coupler to receive a fraction of a transmission signal with one or more frequencies from a primary output path of the silicon photonics transmission system. The wavelength locker further includes a splitter configured to split the input to a first signal in a first path and a second signal in a second path and a first delay-line-interferometer (DLI) coupled to the second path to receive the second signal and configured to generate an interference spectrum and output at least two sub-spectrums tunable to keep quadrature points of the sub-spectrums at respective one or more target frequencies. The wavelength locker is configured to generate an error signal fed back to the silicon photonics transmission system for locking the one or more frequencies at the one or more target frequencies.
Owner:MARVELL ASIA PTE LTD
Delay line interferometers
ActiveUS20110063728A1Easy to manufactureLow costPolarising elementsUsing optical meansTemperature controlBirefringent crystal
The specification describes delay line interferometer designs using combinations of basic optical components that are expected to simplify manufacture and reduce costs while still providing precision optical performance. The main operative components of these designs are polarization beam splitters, birefringent crystals, optical delay components, and waveplates. Temperature controllers may be provided for adjusting the delay of the optical delay components.
Owner:II VI DELAWARE INC
Fast self-adaptive dispersion compensation method in 40Gbps DWDM (dense wavelength division multiplexing) system
ActiveCN103188017AShorten the timeImprove efficiencyElectromagnetic transmissionLocal optimumEngineering
The invention relates to a fast self-adaptive dispersion compensation method in a 40Gbps DWDM (dense wavelength division multiplexing) system. The fast self-adaptive dispersion compensation method specifically comprises the following steps: step A) delaying coarse regulation of an interferometer DLI (delay line interferometer) by an OTU (optical transport unit) receiver; step B) performing dispersion coarse regulation through a dichotomic method; step C) performing fine regulation through a TDC (time-to-digital converter); step D): optimizing the DLI through the receiver; and step E) monitoring through the TDC, judging whether dispersion changes or not by FEC (forward error control) error correction counting or warning and entering step B) or C) if the dispersion changes. According to the method disclosed by the invention, a coarse regulation point is fast found by using the dichotomic method, the optimal dispersion is found by adopting a mid-point method after entering the fine regulation step, the dispersion compensation time is effectively reduced, the efficiency is improved, and the defects of local optimization can be simultaneously avoided.
Owner:FENGHUO COMM SCI & TECH CO LTD
Delay line interferometer with polarization compensation at selective frequency
An apparatus of polarization self-compensated delay line interferometer. The apparatus includes a first waveguide arm of a first material of a first length disposed between an input coupler and an output coupler and a second waveguide arm of the first material of a second length different from the first length disposed between the same input coupler and the same output coupler. The apparatus produces an interference spectrum with multiple periodic passband peaks where certain TE (transverse electric) and TM (transverse magnetic) polarization mode passband peaks are lined up. The apparatus further includes a section of waveguide of a birefringence material of a third length added to the second waveguide arm to induce a phase shift of the lined-up TE / TM passband peaks to a designated grid as corresponding polarization compensated channels of a wide optical band.
Owner:MARVELL ASIA PTE LTD
Michelson interferometer based delay line interferometers
InactiveUS20060268277A1Low and high coefficientUsing optical meansElectromagnetic transmissionLight beamData rate
An interferometer includes a means for splitting, at a splitting location, an input light beam into a first beam and a second beam; and means for recombining, at a recombination location, the first beam and the second beam. The interferometer is designed such that the first beam will travel a first optical path length (OPL) from the splitting location to the recombination location, and the second beam will travel a second OPL from the splitting location to the recombination location and such that when the input light beam has been modulated at a data rate comprising a time interval, then the difference in optical path lengths between the first OPL and the second OPL is about equal to the time interval multiplied by the speed of light
Owner:OPTOPLEX CORP
Multiple-FSR DPSK demodulator
InactiveUS8004750B1Achieve thermal stabilityUsing optical meansElectromagnetic transmittersBeam splitterEngineering
A switchable free-spectral-range mode selector is used to change the free spectral range of a free-space delay-line interferometer. The mode selector consists of a rotatable device with at least one transparent plate selected to produce the desired change in the free spectral range of the delay-line interferometer. The device may be rotated in and out of the free-space optical path of on of the interferometer arms. If used as a DPSK demodulator, the device enables operation at multiple predetermined free spectral ranges. In the preferred embodiment, the demodulator includes a 50 / 50 beam-splitter cube combined with two cavities. The mode selector consists of a plurality of different transparent slabs attached to a rotatable shaft so that any one of the slabs or none may be inserted in the appropriate optical path to obtain the desired FSR mode of operation.
Owner:OPTOPLEX CORP
LLO-based single-wavelength quantum and classical communication simultaneous transmission method
PendingCN111147243ALow costReduce complexityKey distribution for secure communicationWavelength-division multiplex systemsMultiplexingSystem capacity
Owner:GUANGDONG INCUBATOR TECH DEV CO LTD
Rx delay line inteferometer tracking in closed-loop module control for communication
ActiveUS10333627B2Receivers monitoringAmplitude-modulated carrier systemsClosed loopTransimpedance amplifier
The present invention is directed to a communication signal tracking system comprising an optical receiver including one or more delay line interferometers (DLIs) configured to demultiplex incoming optical signals and a transimpedance amplifier configured to convert the incoming optical signals to incoming electrical signals. The communication signal tracking system further includes a control module configured to calculate a bit-error-rate (BER) of the incoming electrical signals before forward-error correction decoding, and use the BER as a parameter for optimizing settings of the one or more DLIs in one or more iterations in a control loop and generating a back-channel data.
Owner:MARVELL ASIA PTE LTD
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