819 results about "Optical amplifier" patented technology

The invention relates to a surface collapse monitoring system based on multi-parameter distributed optical fiber sensing, and the system comprises a monitoring module which comprises a plurality of fully distributed optical fiber sensors laid in a monitoring area, and an optical signal transmission and demodulation module which comprises a continuous spectrum laser, an optical switch, an optical amplifier, an optical filter, and a demodulation module. The data processing and analysis center comprises a data acquisition module and a collapse model modeling module, and the data acquisition module is used for performing acquisition and digital conversion on the optical signal demodulated by the demodulation module; the collapse model modeling module constructs a model according to the monitoring data and can predict the development trend of surface collapse; and the early warning and communication module communicates with a remote monitoring center. The monitoring system provided by the invention has the advantages of multi-parameter monitoring, high monitoring precision, suitability for large-scale laying, real-time response and the like, and can comprehensively and accurately reflect the real condition of surface collapse.

The invention discloses an optical frequency comb generation method and device based on Brillouin scattering and an electro-optical modulator, and belongs to the field of photoelectric measurement. The method comprises the steps that a first laser and a second laser are used for generating pump light and seed light respectively, multi-wavelength pump light is generated through a cascade electro-optical modulator, the pump light and the seed light are emitted into a Sagnac loop, an optical frequency comb is output through the forward Brillouin scattering effect of an optical fiber and the electro-optical modulator, and the seed light and the pump light are output. The polarization controller is adjusted to optimize polarization state matching of the pump light and the seed light, so that the Brillouin scattering effect reaches the maximum value. The device is composed of a laser, an electro-optical modulator, a signal generator, an optical amplifier, an optical isolator, an optical coupler, a polarization controller and an optical fiber. The optical fiber forward Brillouin scattering effect and the electro-optical modulator are combined, the optical frequency comb giving consideration to the wide frequency spectrum and the narrow interval is generated, meanwhile, the comb tooth interval of the optical frequency comb can be accurately controlled by independently adjusting the frequency of the signal generator, and accurate measurement of signals or objects is achieved.

A Rydberg sensor may include a probe laser source and a quantum radio frequency (QRF) cavity downstream from the probe laser source and configured to define a path for a plurality of probe laser beam passes within the QRF cavity. A Rydberg sensing region may be within the QRF cavity and in the path of the probe laser beam passes. An optical amplifier may be within the QRF cavity and in the path of the probe laser beam passes. A detector may be downstream from the QRF cavity.

A semiconductor optical amplifier (SOA) with a variable optical confinement factor I′ along the length of the device is disclosed. At the input end of the SOA, the optical confinement is high as an optical core is adjacent an optical gain layer, resulting in a high-gain region that rapidly increases the optical signal power. In the central portion of the SOA, the optical confinement is continuously reduced as the optical core is tapered away from the optical gain layer, thereby lowering the gain, but increasing the output saturation power. Near the output end of the SOA, the optical confinement factor is held constant, providing a length of additional gain, thereby further increasing the output power. The SOA may optionally include a spot-size converter region to focus the output optical signal.

The invention discloses a multi-modulation-format vector signal modulator based on microwave photonics, and relates to the field of microwave photonics. Comprising an IQ quadrature modulation module, a continuous wave laser, a first power optical splitter, an optical carrier frequency generation module, a polarization beam combiner, an optical amplifier, a polarization beam splitter and a photoelectric balance detector module, the IQ quadrature modulation module comprises a double-parallel Mach-Zehnder modulator, a first forming filter, a second forming filter, a first attenuator, a second attenuator, a first direct current voltage stabilization source and a second direct current voltage stabilization source. According to the invention, the formed and filtered IQ baseband signal is input into the double-parallel Mach-Zehnder modulator for quadrature modulation, the IQ baseband signal and the other path of optical carrier signal subjected to differential MZM frequency multiplication are subjected to polarization beam combination, and then the signal is converted into a radio frequency signal through PD, so that the generation of a high-frequency-band and multi-modulation-format vector signal is realized, and the high-frequency-band multi-modulation-format vector signal is suitable for the fields of high-speed communication, photon radar and the like.

A distributed acoustic system (DAS) that may include two or more lasers that each transmit a continuous wave (CW) light, a pulser disposed after the two the two or more lasers and optically connected to each of the two or more lasers to receive the CW light from each of the two or more lasers and form a light pulse, and an optical amplifier, wherein the pulser is optically connected to the optical amplifier to receive the light pulse from the pulser as an input. The DAS may further include a splitter optically connected to the optical amplifier to optically split the light pulse into two or more light pulses for each output of the splitter a circulator optically connected to each output of the splitter, and a sensor fiber attached to each of the circulators as an output for each circulator.

The invention provides a miniaturized coherent laser wind speed remote measuring instrument and an assembling method thereof.The miniaturized coherent laser wind speed remote measuring instrument comprises an integrated optical module, an optical driving module, a master control processing module and an amplifier, and the integrated optical module comprises a seed laser, a semiconductor optical amplifier and an optical chip; the optical chip adopts a laser radar photon chip and comprises a transmitting link and a receiving link, the transmitting link comprises a beam splitter and a pulse modulator, and an optical mixer and a balance detector are integrated on the receiving link; the integrated optical module is packaged through a photoelectric hybrid packaging technology; and the main control processing module is a high-speed signal acquisition processing module. Through high-density photoelectric hybrid integration, the coherent laser wind speed telemeter is small in size and light in weight, the weight does not exceed 2 kg, and long-distance detection can be guaranteed.

The invention discloses a long-distance optical fiber sensor demodulation device and method, and the device comprises a sweep frequency laser which is configured to scan a preset wavelength range in a stepping manner, and generates a trigger pulse when stepping one wavelength. And the signal generator receives the trigger pulse and outputs a driving pulse. And the semiconductor optical amplifier is used for converting the driving pulse into a high-power optical pulse. The first port of the circulator is connected with the light output end of the semiconductor light amplifier, the second port of the circulator is connected with the grating array to be detected, and the third port of the circulator outputs a reflected light signal. The photoelectric detector receives reflected light signals and converts the reflected light signals into electric signals, the data acquisition card synchronously acquires trigger pulses and the electric signals, and the computer is used for processing data based on a wavelength demodulation formula and a position demodulation formula so as to realize synchronous demodulation of the wavelength and the position of the grating array. According to the invention, synchronous demodulation of the wavelength and the position of the grating array is realized, and accurate multi-point monitoring in the long-distance optical fiber sensor based on the grating array is also realized.

A tunable laser assembly housed in a single enclosure and a method of control is described wherein the tunable laser, pump and semiconductor optical amplifier do not share a common optical axis but are all aligned to optical waveguides on an intervening planar lightwave circuit (PLC). Wavelength monitoring circuitry is included on the PLC to enable monitoring and control of the tunable laser center wavelength and optical bandwidth. The design of the PLC does not introduce perturbations into the swept-source laser output spectrum that would cause artifacts in imaging applications such as optical coherence tomography (OCT).

High-power, integrated optical amplifiers are described in which gain waveguides of the amplifiers are designed to improve power performance by reducing power saturation effects in the amplifier. The gain waveguides can change, in at least one aspect, along the length of the gain waveguide to reduce gain saturation. Multi-mode optical beams and / or multi-stage amplification can also be employed to reduce gain saturation.

The invention discloses an OEO amplifier with a high-speed hard switching function and an optical transmission system, and relates to the technical field of optical amplifiers, the OEO amplifier comprises three magneto-optical switches, an optical splitter group, a photoelectric detector group, a real-time comparison circuit, a logic gate control circuit and a driving circuit; the photoelectric detector group collects optical signal power to generate an electric signal; the real-time comparison circuit performs voltage threshold judgment on the electric signal; the logic gate control circuit is connected with the output end of the real-time comparison circuit so as to synchronously control the switching states of the three magneto-optical switches according to a voltage threshold judgment result; the driving circuit is used for driving the magneto-optical switch to synchronously execute a switching action; when the OEO amplifier detects that optical signals in any direction are interrupted, all the magneto-optical switches finish synchronous switching within 100 microseconds, and the end-to-end optical signal switching time difference is smaller than 2 picoseconds. The method is suitable for a single-fiber bidirectional optical communication environment requiring high frequency, high precision and high stability.

The present application discloses an optical amplifier and an optical communication system, which releases or consumes the pump energy required by each level of optical amplification structure in real time and dynamically by adaptively adjusting the energy of complementary light corresponding to the signal light, thereby eliminating the transient overshoot phenomenon. The aforementioned optical amplifier may include an optical amplifier controller, a combiner, a first device, and an N-level optical amplifier structure arranged in a cascade manner. Among them, the N-level optical amplifier structure is used to amplify the signal light; the optical amplifier controller is used to obtain a first gain value of the signal light, and determine a first VOA value and a first pump current value corresponding to the first gain value according to the first gain value and the correlation relationship, and send the first VOA value corresponding to the first gain value to the first device. The first device is used to adjust the loop attenuation according to the first VOA value to emit complementary light corresponding to the signal light.

A miniaturized interferometric integrated photonic gyroscope structure with top silicon oxide, middle silicon oxide and bottom silicon oxide deposited on a silicon substrate comprises broadband optical source or a semiconductor optical amplifier with silicon nitride ring resonator wavelength filter, connected with a thin film lithium niobate or piezoelectrically actuated silicon nitride phase modulator vertically coupled with a silicon nitride waveguide spiral loop. The silicon nitride waveguide spiral loop is patterned on thin bottom oxide layer with air trenches below it and connected with a germanium detector either through photonic wire bonding or vertically integrated through reflecting mirror embedded into silicon wafer. Various methods of coupling alternative materials are described and the potential of connecting several spiral waveguides for enhanced sensitivity in a gyroscope application.

The invention relates to a vertical cavity semiconductor optical amplifier and a use method thereof, and belongs to the technical field of semiconductor optical amplifiers, the vertical cavity semiconductor optical amplifier sequentially comprises an N-surface electrode, an N-surface insulating layer, a substrate, an active region, a P-surface insulating layer and a P-surface electrode, the N-surface electrode and the P-surface electrode both comprise a cathode, an anode and a discharge cavity, the cathode discharges to break down discharge gas in the discharge cavity to generate the low-temperature plasma electrode, a plurality of leakage holes are evenly distributed in the N-face insulating layer and the P-face insulating layer, the cathode and the anode are electrically connected with a discharge power source, and the N-face electrode and the P-face electrode are electrically connected with a driving power source. The technical problems that in the prior art, due to the current crowding effect, a vertical cavity semiconductor optical amplifier of an electric pump is limited in clear aperture, limited in amplification capacity and low in output power can be solved.

To provide mechanisms for providing a source for circular-ranging OCT at moderate speeds.SOLUTION: A source for providing electromagnetic radiation within a particular spectral range includes: a ring-shaped optical resonator for circulating a plurality of wavelength bands including a first optical phase modulator, a first chromatic dispersion device, a second optical phase modulator, a multi-line spectral domain filter, a second chromatic dispersion device, and an optical amplifier; and a controller coupled to the first optical phase modulator and the second optical phase modulator, the controller being configured to drive the first optical phase modulator with a first waveform and the second optical phase modulator with a second waveform.SELECTED DRAWING: Figure 2

The present disclosure relates to the field of optical communication, and relates to an optical transmission system, a switching method, an optical amplifier board, a medium, and an electronic device, which are able to avoid switching failure of OMSP protection. The switching method is a switching method for redundancy protection of an optical transmission system. The optical transmission system comprises a main optical channel and a standby optical channel. The switching method comprises: acquiring a received optical power of an amplifier in an optical channel among the main optical channel and the standby optical channel through which an optical signal is currently being transmitted; comparing the received optical power with a threshold value, the threshold value being associated with a reference value and a relative threshold, and the relative threshold being associated with an optical fiber characteristic of a span in which the amplifier is located; if the received optical power is lower than the threshold value, turning off light output of the amplifier; and in response to turning off the light output of the amplifier, switching the transmission of the optical signal to the optical channel among the main optical channel and the standby optical channel through which the optical signal is not currently being transmitted.

The embodiment of the application provides an optical amplifier, an optical assembly, an optical module, an optical communication network system and a detection device, relates to the technical field of semiconductors, and is used for solving the problem of one-way light emission of the optical amplifier. The optical amplifier comprises a waveguide and a photonic crystal. The waveguide comprises a core region and a cladding region arranged at the periphery of the core region. The waveguide further comprises an incident light side, a first light emission side and a second light emission side. The photonic crystal is arranged in the cladding region of the waveguide. The core region is located between the incident light side and the first light emission side, and the photonic crystal is located between the second light emission side and the core region. The photonic crystal is used for receiving incident light from the incident light side and emitting first emitted light and second emitted light. The first emitted light is emitted from the first light emission side, and the second emitted light is emitted from the second light emission side.

The invention relates to the technical field of semiconductor lasers, and particularly provides a tunable narrow-linewidth multi-wavelength laser based on injection locking, which comprises a light source, an optical splitter, a coupler, a photoacoustic frequency shifter and a micro-ring, the optical path of each sub-beam is provided with a photoacoustic frequency shifter and a micro-ring, the photoacoustic frequency shifters are responsible for adjusting the frequency of the sub-beams, the micro-rings and a light source form an injection locking relation and compress the line width of the sub-beams, then all the sub-beams are combined through a coupler, and finally power amplification is conducted through a semiconductor optical amplifier. Through the optical splitter, the photoacoustic frequency shifter and the micro-ring, the single light source system outputs equally-spaced multi-wavelength laser, and the defects of a traditional multi-light-source design are overcome.

The invention discloses a system for eliminating fading noise in a distributed optical fiber sound wave sensing system. The system comprises a light source, an optical frequency shift modulator, an optical amplifier, an optical circulator, a photoelectric detector, a data acquisition card and a data demodulator, laser emitted by the light source is modulated into double-pulse light with frequency difference through the light frequency shift modulator, the double-pulse light is injected into the optical fiber through the optical circulator after being amplified by the optical amplifier, Rayleigh backscattered light generated in the optical fiber is emitted back to the optical circulator, light emitted by the optical circulator is detected and converted into an electric signal through the photoelectric detector, and the electric signal is transmitted to the optical fiber through the optical circulator. The electric signals are collected and converted into digital signals through the data collection card, and the data demodulator demodulates the digital signals through a fading noise elimination method to obtain signals with fading noise eliminated. Therefore, fading noise in the distributed optical fiber acoustic wave sensing system can be effectively eliminated, the signal quality is improved, and error signal interference is eliminated.

A semiconductor optical amplifier array device includes: a substrate; and a plurality of semiconductor optical amplifiers formed on the substrate, each of the semiconductor optical amplifiers including an active region, and two input-output ports optically connected to the active region and disposed on same facet of the semiconductor optical amplifier array device. The plurality of semiconductor optical amplifiers include a first semiconductor optical amplifier in which length of the active region is equal to a first length, and a second semiconductor optical amplifier in which length of the active region is equal to a second length that is different from the first length.

The invention discloses a relay device and method for long-distance few-mode optical fiber communication, and belongs to the field of optical communication. According to the device, firstly, optical signals transmitted in a few-mode optical fiber are separated into a plurality of independent mode channels through a mode decomposition multiplexer; then, an adjustable light delay unit is configured in each channel, and compensation is carried out according to a difference mode group delay difference pre-calculated or actually measured by a few-mode optical fiber parameter; furthermore, a dimmable amplifier is used for amplifying the signal, power monitoring is carried out at the output end of the amplifier through an optical fiber beam splitter and a photoelectric detector, closed-loop feedback control is formed, and gain of each channel is adjusted in a self-adaptive mode to eliminate mode-dependent loss. According to the invention, signal distortion can be effectively suppressed in an optical domain, the complexity of digital signal processing of a receiving end is reduced, and the transmission distance and the transmission capacity of a few-mode optical fiber mode division multiplexing communication system are remarkably improved.

A tunable laser includes: a channel selection assembly, a plurality of optical amplifiers, a micro-ring filtering assembly and a reflection assembly. The micro-ring filtering assembly is coupled to the reflection assembly, and operation wavelength ranges of the respective optical amplifiers are different. The channel selection assembly is used for selecting any optical amplifier to input a gain optical signal to the micro-ring filtering assembly. The micro-ring filtering assembly is used for filtering the gain optical signal under a vernier caliper effect to obtain filtered optical signals, and then inputting same into the reflection assembly. The reflection assembly is used for outputting some of the filtered optical signal outwards, and reflecting, after the remaining optical signals pass through the micro-ring filtering assembly, the remaining optical signals to an optical amplifier currently selected by the channel selection assembly.

A wavelength variable optical resonator includes a wavelength variable filter and first and second waveguides each including a part inclined relative to a first end surface. A first optical amplifier includes a third waveguide including an active region on which reflection means is provided, the third waveguide being provided between a second end surface and a third end surface opposed to the second end surface and, the third waveguide further including a part inclined relative to the second end surface and extended from the second end surface. A second optical amplifier amplifies a laser light propagating through a fourth waveguide after the laser light whose wavelength is adjusted by the wavelength variable filter is input to the fourth waveguide via a fourth end surface facing the first end surface, the fourth waveguide including a part inclined relative to the fourth end surface and extended from the fourth end surface.

The invention discloses an OPGW optical cable lightning stroke positioning monitoring system and monitoring method based on distributed optical fiber sensing. Comprising a DFB laser, a first optical coupler, an acoustic optical modulator, a pulse signal generator, a scrambler, a first EDFA optical amplifier, a first optical isolator, an optical circulator, an FBG filter, an OPGW sensing optical cable, an electro-optical modulator, a microwave signal generator, a polarization regulator, a second EDFA optical amplifier, a second optical isolator, a second optical coupler and a variable optical attenuator which are connected in sequence. A third optical coupler, a balance detector, a low-frequency amplifier and a data processing module. The system can quickly and accurately position the lightning stroke position of the OPGW optical cable by measuring the Brillouin scattering frequency shift and the vibration state of the scattering signal.

The invention relates to a sweep frequency optical frequency comb generation system and a generation method. Fourier mode locking is realized through a Fourier mode locking photoelectric oscillator system. The sweep frequency optical frequency comb generation system is a closed Fourier mode-locked laser loop which is composed of a first optical amplifier, an optical fiber isolator, a broadband filter, a polarization controller, a thin film lithium niobate optical chip, a signal generator, a dispersion compensation optical fiber and a first optical coupler; and a photoelectric oscillator loop is formed by a second optical coupler, a single-mode delay optical fiber, a second optical amplifier, a photoelectric detector, a narrow-band filter, a low-noise amplifier and an electric power divider. Time domain active mode locking and Fourier mode locking are carried out on the laser resonant cavity at the same time, synchronous modulation of multiple optical frequency comb modes is achieved, sweep frequency optical frequency comb signals with high repetition frequency, high modulation speed, high coherence length and high output power are generated, and tunable optical frequency comb and high-quality high-frequency microwave signal output can be provided at the same time.

A light source apparatus includes a gas discharge stage, a sensing apparatus, an optical arrangement, an adjustment apparatus, and a control apparatus. The gas discharge stage includes an optical amplifier including a chamber configured to hold a gas discharge medium outputting a light beam, and a set of optical elements configured to form an optical resonator around the optical amplifier. The optical arrangement is configured to image light from a plurality of distinct object planes within the gas discharge stage onto the sensing apparatus. The adjustment apparatus is in physical communication with one or more optical components within the gas discharge stage and is configured to modify at least one geometric aspect of the optical components. The control apparatus is communication with the sensing apparatus and the adjustment apparatus and is configured to provide a signal to the adjustment apparatus based on an output from the sensing apparatus.

The invention relates to the technical field of optical amplifiers, in particular to an optical amplifier based on QSFP-DD packaging. The optical amplifier comprises a packaging shell, a circuit board, an optical assembly and a heating piece. The circuit board is arranged in the packaging shell, and a connecting module is arranged at one end, penetrating out of the shell, of the circuit board; the optical assembly comprises an erbium-doped optical fiber which is located in the packaging shell and arranged on one side of the circuit board in the thickness direction; the heating element is arranged in the packaging shell and is positioned between the erbium-doped optical fiber and the circuit board; wherein the circuit board is electrically connected to the heating element, and the heating element acts on the Er-doped optical fiber so as to adjust the temperature of the Er-doped optical fiber. The optical amplifier based on QSFP-DD packaging is smaller in size, can meet the arrangement requirement of a high-density data center cabinet, and is more stable in transmission performance during working.

A system comprises a seed laser diode, a semiconductor optical amplifier, and a driver. The seed laser diode is configured to produce a seed optical signal. The semiconductor optical amplifier is configured to, based on an injected amplifier current pulse, amplify the seed optical signal to produce an emitted optical signal. The driver is configured to provide to the seed laser diode or the semiconductor optical amplifier, a profiled compensation current associated with the injected amplifier current pulse to at least in part control a frequency chirp of the emitted optical signal.

A self-powered optical amplifier (SPOA) may include a proximal tap connected to a fiber optic cable, a proximal wavelength division multiplexer (WDM) optically connected to the proximal tap, and an Erbium doped fiber optically connecting the proximal WDM to a distal WDM. The SPOA may further includes a distal tap optically connected to the distal WDM, a pump optically connected to the distal WDM, and a controller optically connected to the proximal tap, the distal tap, and further electrically connected to the pump and a power supply.

A distributed acoustic system (DAS) that may include two or more lasers that each transmit a continuous wave (CW) light, a pulser disposed after the two the two or more lasers and optically connected to each of the two or more lasers to receive the CW light from each of the two or more lasers and form a light pulse, and an optical amplifier, wherein the pulser is optically connected to the optical amplifier to receive the light pulse from the pulser as an input. The DAS may further include a splitter optically connected to the optical amplifier to optically split the light pulse into two or more light pulses for each output of the splitter a circulator optically connected to each output of the splitter, and a sensor fiber attached to each of the circulators as an output for each circulator.