Abstract: This application discloses a laser detection apparatus, a method for manufacturing the laser detection apparatus, and a terminal, and belongs to the field of laser detection technologies, for example, light detection and ranging (Lidar). The apparatus includes a multiphase signal generation circuit, an amplifier array, and a laser transmitter array. The amplifier array includes a plurality of first amplifiers, and the laser transmitter array includes a plurality of laser transmitters. A plurality of output ends of the multiphase signal generation circuit are connected to input ends of corresponding first amplifiers, and output ends of the plurality of first amplifiers are connected to corresponding laser transmitters.

Abstract: Provided is a light detection and ranging (LiDAR)-based inspection device including an ultrafast pulse source configured to generate a first ultrafast pulse and a second ultrafast pulse each having a pulse width ranging from 1 fs to 100 fs, a stage configured to generate a gating signal by adjusting a distance of flight of the first ultrafast pulse, a dispersing device configured to generate a chirp signal, based on the second ultrafast pulse reflected from a specimen, the chirp signal including a plurality of pulses having different wavelengths, a nonlinear optical generator configured to generate a nonlinear optical signal based on the chirp signal and the gating signal, and a detector configured to detect the nonlinear optical signal, wherein the gating signal temporally overlaps with some of the plurality of pulses included in the chirp signal in the nonlinear optical generator.

Abstract: In some implementations, an optical amplifier system includes a variable gain optical amplifier that is an erbium doped fiber amplifier. The variable gain optical amplifier may provide a first gain stage for an optical signal. The optical amplifier system may include a fixed gain optical amplifier that is an erbium-ytterbium doped fiber amplifier. The fixed gain optical amplifier may provide a second gain stage for the optical signal following the first gain stage.

Abstract: A gain adjuster, a gain adjustment method, and an optical line terminal are provided, to separately adjust a gain of a to-be-adjusted optical signal. The gain adjuster includes a light spot conversion component and a gain medium that are sequentially coupled. The gain adjuster further includes a pump laser. The light spot conversion component is configured to adjust light spot sizes of at least some optical signals in received optical signals to output a first optical signal transmitted in space. The pump laser is configured to excite the gain medium. The gain medium is configured to adjust a gain of the first optical signal to output a second optical signal.

Abstract: A LIDAR system includes a static monolithic LIDAR transceiver, a collimating optic, and a first rotatable wedge prism. The static monolithic LIDAR transceiver is configured to transmit a laser beam and receive reflected laser light from a first target object. The collimating optic is configured to narrow the transmitted laser beam to produce a collimated laser beam. The first rotatable wedge prism is configured to steer the collimated laser beam in a direction of the first target object based on the first rotatable wedge prism being in a first position.

Abstract: An optical fiber and an optical amplifier including the optical fiber are disclosed, the optical fiber includes a core region for guiding a propagation of a multimode optical signal, a cladding region laterally surrounding the core region and at least two doped rings, each of the at least two doped rings having a corresponding rare-earth or transition metal dopant concentration. The core region includes a central core having a first refractive index, at least one core layer laterally surrounding the central core, each of the at least one core layer having corresponding internal and external radii, an internal radius of an innermost core layer corresponding to a radius of the central core and an external radius of the outermost core layer corresponding to a radius of the core region.

Abstract: This application discloses an optical amplifier including a Raman fiber amplifier (RFA), a dynamic gain equalizer (DGE), a filter, an erbium-doped fiber amplifier (EDFA), an RFA gain controller, an EDFA gain controller, and an optical amplifier controller. The optical amplifier controller is configured to provide instructions to and receive feedback from the RFA and EDFA gain controllers. The RFA and the EDFA are configured to amplify an optical signal. The RFA gain controller is configured to control the RFA to adjust a gain. The EDFA gain controller is configured to control the EDFA to adjust a gain. The DGE adjusts insertion loss. The filter is configured to filter an amplified spontaneous emission signal produced in an optical amplification process of the RFA.

Abstract: Disclosed herein are methods and systems for automatically configuring a raman amplifier. One exemplary system may be provided with the raman amplifier, a user device, and a network administration device. A processor of the network administration device executes instructions that cause the network administration device to generate a machine learning model using machine learning techniques and deploy the machine learning model to a controller of the raman amplifier. When a desired gain profile is communicated from the user device to the controller of the raman amplifier, instructions stored in non-transitory computer readable memory cause a processor of the controller to automatically assess the desired gain profile using the machine learning model to determine raman pump configurations for each of a plurality of raman pumps of the raman amplifier and send the determined raman pump configurations to each of the plurality of raman pumps of the raman amplifier.

Abstract: Embodiments of this application relates to the technical fields of optical signal processing and optical devices, providing a LiDAR and a movable device. The LiDAR comprises a receiving waveguide array, at least three photoelectric detection modules, at least three signal processing modules, and at least two analog-to-digital conversion modules. Since at least one of the analog-to-digital conversion modules is connected to the signal processing modules corresponding to at least two receiving waveguides that are not adjacent in the receiving waveguide array, there is no need to set up a digital-to-analog converter for each receiving waveguide, avoiding technical issues such as excessive number of converters and large data volume, while reducing the problem of crosstalk noise from bypass waveguides, thereby improving the performance of the LiDAR.

Abstract: Embodiments of the present disclosure provide a configurable TIA circuit that can be used as both a single-ended “target TIA” and a differential “reference TIA”. The configurable TIA may include a first circuit to receive an input from a first photodiode (PD), the first circuit comprising a first switch and a first output buffer. The configurable TIA may also include a second circuit to receive an input from a second PD, the second circuit comprising a second switch and a second output buffer. The first and second switches are configured to operate the first and second circuits as independent signal paths via which the input from the first and second PDs can drive the first and second output buffers respectively in a first mode, and in a second mode, combine the input from the first and second PDs into the first output buffer to generate a single differential output.

Abstract: Light amplification devices using coupled multi-core optical fibers have a figure of merit that temporally varies, which makes it difficult to perform performance evaluation and to build a light transmission system using the same. Accordingly, a light amplification device of the present invention comprises: a band control means that controls the wavelength band of a light carrier to generate a band control light; and a band control light amplification means that has a plurality of light amplification media through which the band control light propagates, wherein the band control light amplification means amplifies the band control light in a coupled state in which the light propagating through the plurality of light amplification media induces a crosstalk and wherein the band control means controls the wavelength band such that the band control light having propagated through the plurality of light amplification media has a reduced coherence.

Abstract: Apparatus and methods for mitigating transverse mode instabilities (TMI) in high power fiber amplifiers that does not depend on active feedback loops. The apparatus and method involve the modulation of the amplitude and/or phase of selected spatial mode components of an input signal beam to increase the TMI threshold of the amplifier. Once the desired modal adjustments are made, the beam is input to a mode multiplexer whereupon an optimized output beam can be input to the active fiber of the amplifier system. By increasing the TMI threshold of the amplifier, the amplifier can be operated at higher power before TMI sets in. A control stage of the fiber amplifier system includes (a) a (seed) beam splitting section; (b) an amplitude and phase control component; and (c) a mode multiplexer that maps multiple individual signal beams to different fiber modes.

Abstract: A low wavelength infrared Super Continuum (SC) signal from a master oscillator introduces two or more seeds into an amplifier that supports the Raman effect. A counter-propagating, high-power, continuous wave, or quasi-continuous wave quantum cascade lasers pump (amplifies) a first optical seed creating a cascading amplification of subsequent optical seeds forming two or more tunable wavelength coherent optical pump sources.

Abstract: In the present disclosure, in an EADFB laser in which an SOA has been integrated, a new configuration in which deterioration of optical waveform quality is solved or mitigated while keeping characteristics that a manufacturing process can be simplified by using the same layer structure is indicated. In the optical transmitter of the present disclosure, a waveguide structure having a tapered structure in at least a part of the SOA waveguide is adopted. A width of the waveguide is changed to be reduced in an SOA region, and an amount of carrier consumption is made uniform in an optical waveguide direction. A waveguide width is continuously reduced in an optical waveguide direction in the SOA so that the optical confinement coefficient is reduced, and light power distributed in an active layer region is made constant.

Abstract: A surveying pole and to a secondary sensor unit which is attachable to the surveying pole. A reflector and/or GNSS receiver attachable to the surveying pole can be attached independently of whether or not the secondary sensor unit is attached to the surveying pole. A distance between the reflector and/or GNSS receiver and a pole tip is also independent of whether or not the secondary sensor unit is attached to the surveying pole. A distance between an attached reflector and/or GNSS receiver and the attached secondary sensor unit is also known and fixed. A method and computer program product for numerically correcting distance measurement errors due to reflector orientation and position with respect to a primary sensor, in particular a tachymeter.

Abstract: An optical measurement device includes at least a multi-frequency laser configured to simultaneously generate a frequency-fixed carrier and at least one frequency-modulated subcarrier, an optical branching element, a dual frequency beat signal generator, a difference signal generator, and an arithmetic processing unit. Either the carrier or the subcarrier within the output light of the multi-frequency laser is used as first measurement light and either the carrier or the subcarrier having a frequency different from that of the first measurement light is used as second measurement light. The dual frequency beat signal generator separates and outputs a first complex beat signal derived from the first measurement light and a second complex beat signal derived from the second measurement light. The difference signal generator outputs a difference signal between the first complex beat signal and the second complex beat signal.

Abstract: The present disclosure is directed to light-distribution systems on photonic integrated circuits (PIC) that split and amplify a light signal received from at least one remotely located laser into a plurality of amplified light signals, where amplification is provided by an integrated semiconductor optical amplifier (SOA). By locating the laser remotely with respect to the SOA-based PIC, the laser and PIC can be subjected to different ambient environmental conditions. Additionally, a lower-power laser can be used since the optical loss associated with splitting is compensated for by the amplification. As a result, lower current densities and optical powers can be used in both the source laser and the SOA. In some embodiments, the sequence of power splitting and amplification is repeated multiple times, thereby enabling system to scale gracefully.

Abstract: The examples herein provide enhanced optical architectures employing techniques and systems for scaling up a signal bandwidth and correcting errors in optical signals to achieve a corrected waveform that can be adjusted for the desired application with broad tuning of bandwidth, chirp rate, chirp duration and symmetry. An optical signal is provided for circulation in an optical loop, and incremental modulations are applied to the optical signal over a quantity of circulations to establish circulating waveforms that form a composite waveform. Detected errors in the circulating waveforms can be corrected during the incremental modulations. In some instances, a portion of the optical signal comprising the composite waveform can then be directed for emission toward a remote target and remote sensing of properties of the remote target.

Abstract: In some implementations, a fiber amplifier system includes a fiber oscillator and a fiber amplifier coupled to an output end of the fiber oscillator. The fiber oscillator may include an active fiber having a first end and a second end, where the active fiber is to receive pump light from one or more optical sources; one or more high-reflectivity mirrors coupled to the first end of the active fiber; and multiple output coupler mirrors coupled to the second end of the active fiber. The one or more high-reflectivity mirrors and the multiple output coupler mirrors may form an optical cavity with the active fiber for generating laser light. The multiple output coupler mirrors may have respective center wavelengths that are different. The multiple output coupler mirrors may have respective reflection spectrums that are different.

Abstract: A time-of-flight (ToF) imaging system includes a photonic mixer device configured to perform ToF measurements using at least one photo-sensitive element. Each photo-sensitive element includes at least a first element with a modifiable first charge level, a second element with a modifiable second charge level, and a gate for transferring charges to a fixed potential. The ToF imaging system includes control circuitry configured to provide a control signal for the photonic mixer device. The control signal is configured to drive the at least one photo-sensitive element such that charge carriers generated in the at least one photo-sensitive element by received light are directed either to the first element, the second element or the gate, or such that charge carriers generated in the at least one photo-sensitive element by received light are directed either to the first element, the second element, the gate, or to the first and the second element.