1111 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 provides a high-power multimode fiber laser amplifier based on wavefront shaping. The high-power multimode fiber laser amplifier comprises a seed light wavefront control unit, a multimode gain fiber amplification unit and an output light spot detection and feedback unit, the seed light wavefront control unit is used for carrying out wavefront modulation on the seed light output by the polarization seed laser by using a spatial light modulator loaded with a phase diagram; the multimode gain optical fiber amplification unit is used for performing power amplification on the seed light which is output by the seed light wavefront control system and is subjected to output wavefront modulation; and the output light spot detection and feedback unit is used for outputting the laser of most power of the multimode gain fiber amplification system, collecting the rest laser of a small part of power for far-field light spot information detection, calculating the corresponding far-field barrel medium power based on the detected far-field light spot information, and outputting the far-field barrel medium power. And the power in the far-field barrel is used as an evaluation function to operate an optimization algorithm to generate an optimal phase diagram, and the optimal phase diagram is loaded on the spatial light modulator to realize closed-loop feedback control.

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.

The invention relates to an optical fiber communication sensing integrated architecture and a working method thereof. Comprising a sensing system laser, a coupler, a polarization beam splitter, a semiconductor optical amplifier, a polarization multiplexing communication transmitting system, a polarization wavelength two-dimensional demultiplexer, namely a WDM-PM device, a coarse wavelength division multiplexer MMI-WDM, a single-mode fiber, a polarization multiplexing communication receiving system, a polarization diversity double-balanced photoelectric detector PBPD, and an ROTDR and phi OTDR data processing unit. According to the invention, not only can high-capacity and long-distance communication under fusion of polarization multiplexing and wavelength division multiplexing be realized, but also sensing and communication can be fused through a wavelength division multiplexing system, the quality of sensing signals is improved through polarization diversity reception on the basis, and mutual promotion of communication and sensing is realized.

A photonic circuit with at least one semiconductor optical amplifier-based amplitude thresholder for correcting bit errors. The photonic circuit further includes a first cascaded series of one or more photonic components and a second cascaded series of one or more photonic components that is coupled to the at least one amplitude thresholder. The first cascaded series of one or more photonic components generates one or more intermediate photonic output signals based on one or more received photonic input signals. The at least one amplitude thresholder generates one or more thresholding photonic signals based on a first of the one or more photonic output signals. The second cascaded series of one or more photonic components generates one or more photonic output signals based at least in part on a second of the one or more intermediate photonic output signals and the one or more thresholding photonic signals.

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 photonic circuit with a semiconductor optical amplifier-based amplitude thresholder for correcting bit errors produced by a passive photonic logic. In addition to the amplitude thresholder, the photonic circuit further includes a plurality of photonic inputs receiving photonic input signals, a first cascaded series of photonic components coupled to the photonic inputs, and a second cascaded series of photonic components coupled to the amplitude thresholder. The first cascaded series of photonic components generates a plurality of intermediate photonic output signals based on the photonic input signals. The amplitude thresholder generates a saturated photonic signal based on a first of the plurality of intermediate photonic output signals when the amplitude thresholder operates in a single nonlinear region. The second cascaded series of photonic components generates a photonic output signal based at least in part on a second of the plurality of intermediate photonic output signals and the saturated photonic signal.

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.

The invention discloses a noise suppression parameter self-adjusting optical fiber optical frequency transfer relay system, which comprises multiple stages of relay stations which are cascaded in sequence, each stage of relay station comprises a receiving end, an optical amplification end and a transmitting end which are connected in sequence, and the transmitting end of the previous stage of relay station is connected to the receiving end of the next stage of relay station, the receiving end is used for receiving an optical frequency signal from an upper-level relay station; the optical amplification end is used for carrying out coherent amplification on a received optical frequency signal, and the sending end is used for transmitting the optical frequency signal after coherent amplification to a next-stage relay station and measuring and eliminating additional phase noise in a signal transmission link. According to the optical fiber optical frequency transfer relay system, self-adjustment of noise suppression parameters can be effectively achieved, and therefore effective suppression of additional phase noise is achieved.

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 relates to a wavelength-switchable, semiconductor laser (10), for generating of laser light in the optical range between 1 μm and 100 μm, wherein the laser (10) comprises an external cavity (11) and at least the following components: a semiconductor optical amplifier (12), comprising an intra-cavity facet (121) facing towards; a first optical element (13) for collimating a laser beam exiting the intra-cavity facet (121) arranged at the intra-cavity facet (121) of the semiconductor optical amplifier (12); a transmissive, wavelength-adjustable interference filter (1), comprising at least i) a wavelength-adjustable Fabry-Perot filter (100) and ii) a Fabry-Perot etalon (110) comprising a first planar surface (111) and a second planar (112) surface, wherein the first and second surface (111, 112) of the etalon (110) are arranged opposite and plane-parallel to each other and delimit an etalon cavity (113); wherein the Fabry-Perot etalon (110) and the Fabry-Perot filter (100) are arranged in a row; wherein the interference filter (1) is arranged between the first optical element (13) and the beam splitter (14), and wherein the components are arranged such that laser light comprising a selected laser wavelength can stably resonate in the external cavity, wherein an on-axis, retro-reflecting beam splitter (14) is arranged at one end of the external cavity (11). Furthermore, the invention relates to a method for selecting a laser wavelength using the laser.

A self-referenced locked optical frequency comb generation system based on thin-film lithium niobate includes: a first pump optical coupler, a first bus waveguide, an active microring, a mode spot converter, an optical amplifier, and a first end face coupler arranged on a rare earth-doped thin-film lithium niobate chip along the propagation direction of the optical signal; a second end face coupler, a wavelength division multiplexer, a dispersion compensation waveguide, a second bus waveguide, a passive microring, and a beam splitter arranged on the thin-film lithium niobate chip along the propagation direction of the optical signal; and a second pump optical coupler, an optical frequency comb output coupler, an optical filter, and a frequency doubling optical output coupler. The present invention realizes the generation of an on-chip self-locked optical frequency comb by using devices such as a mode-locked laser, an optical amplifier, and a high-Q value microring based on thin-film lithium niobate, and has broad application prospects.

The utility model relates to the technical field of semiconductor optical amplifiers, in particular to a semiconductor optical amplification device. Comprising an optical splitter, a first semiconductor optical chip, a first reflector, a second reflector, a second semiconductor optical chip and a beam combiner, and the optical splitter is used for splitting input light into a first light beam and a second light beam; the first semiconductor optical chip and the first reflector are sequentially arranged along a light path of the first light beam; the first semiconductor optical chip is electrified to perform gain amplification on the first light beam; the first reflector is used for reflecting the first light beam after gain amplification; the second reflector and the second semiconductor optical chip are sequentially arranged along the light path of the second light beam; the second reflector is used for reflecting the second light beam into the second semiconductor optical chip, and the second semiconductor optical chip is electrified to perform gain amplification on the second light beam; the beam combiner is arranged at the tail end of the light path of the first light beam and the tail end of the light path of the second light beam and used for combining and emitting the first light beam and the second light beam. According to the utility model, the output optical power can reach 20dBm.

The invention relates to the technical field of wavelength division multiplexing, in particular to an intelligent adjusting and testing method and device for integrated wavelength division multiplexing equipment. The method comprises the following steps: firstly, determining an optimal input and output optical power target value through theoretical calculation, and then realizing closed-loop adjustment by combining with a monitoring system constructed by an MEMS optical switch and a spectrum analyzer; specifically, single-wave power is calculated in a maximum output optical power-channel number conversion mode, an input target value is reversely deduced based on optical amplifier gain, an input threshold value of a power amplifier is set by considering a transmission distance, and finally system performance is dynamically optimized by adopting bidirectional intelligent adjustment and measurement. Theoretical calculation, real-time monitoring and automatic adjustment are combined, accurate control over the input optical power of each wave channel is achieved, it is guaranteed that the gain of each wave channel output by the optical amplifier module is flat, the consistency of the power between the wave channels is continuously maintained through a real-time monitoring and automatic adjustment mechanism, and the signal receiving quality is improved.

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.