Abstract: A coherent passive optical network includes a downstream transceiver and first and second upstream transceivers in communication with an optical transport medium. The downstream transceiver includes a downstream processor for mapping a downstream data stream to a plurality of sub-bands, and a downstream transmitter for transmitting a downstream optical signal modulated with the plurality of sub-bands. The first upstream transceiver includes a first local oscillator (LO) for tuning a first LO center frequency to a first sub-band of the plurality of sub-bands, and a first downstream receiver for coherently detecting the downstream optical signal within the first sub-band. The second upstream transceiver includes a second downstream receiver configured for coherently detecting the downstream optical signal within a second sub-band of the plurality of sub-bands. The downstream processor dynamically allocates the first and second sub-bands to the first and second transceivers in the time and frequency domains.

Abstract: A method for chromatic dispersion pre-compensation in an optical communication network includes (1) distorting an original modulated signal according to an inverse of a transmission function of the optical communication network, to generate a compensated signal, (2) modulating a magnitude of an optical signal in response to a magnitude of the compensated signal, and (3) modulating a phase of the optical signal, after modulating the magnitude of the optical signal, in response to a phase of the compensated signal.

Abstract: A method for allocating bandwidth to a first ONU, a second ONU, M1 ONUs, and M2 ONUs includes, during an allocation cycle, (i) granting a respective upstream time slot to, of a plurality of N ONUs, only each of the M1 ONUs, and (ii) granting a first upstream time slot to the first ONU. Each of the M1 ONUs and M2 ONUs is one of the plurality of N ONUs. The method also includes, during a subsequent cycle, (i) granting a respective upstream time slot to, of the plurality of N ONUs, only each of the M2 ONUs. The N ONUs includes a skipped-ONU that is one of either, and not both, the M1 ONUs and the M2 ONUs. The method includes, during the subsequent allocation cycle, granting a second upstream time slot to a second ONU, which is not one of the plurality of N ONUs.

Abstract: An integrated transceiver is provided for a coherent optical communication network. The integrated transceiver includes a first optical transceiver portion configured to receive and transmit coherent optical signals from and to the coherent optical communication network, respectively. The integrated transceiver further includes a second optical transceiver portion configured to receive and transmit non-coherent optical signals respectively from and to a non-coherent optical communication network. The integrated transceiver further includes an integrated media access control (MAC) processor disposed between the first and second optical transceiver portions.

Abstract: A fiber-optic network is used to interrogate a geographic area for propagating waves initiated by events external to the fiber-optic network. The probe signals are frequency modulation aligned and/or carrier frequency aligned with one another. Scattered energy indicative of probe signals' interactions with the propagating wave are time aligned with one another, amplitude normalized, cross correlated and/or added together to improve signal-to-noise and spatial resolution.

Abstract: An injection locking laser source is provided for an optical communications system. The injection locking laser source includes a laser cavity configured to receive an externally injected low linewidth primary light source. The laser cavity includes a cavity length, a cavity facet reflectivity, and a cavity quality factor. The injection locking laser source further includes an emitting region configured to output a secondary light source injection locked to the externally injected low linewidth primary light source at a stable detuning frequency based on a photon number, a steady-state phase, and a carrier number of the primary light source injected into the cavity.

Abstract: A communications network includes a central communication unit, an optical transport medium, and a plurality of remote radio base stations. The central communication unit generates, within a selected millimeter-wave frequency band, a plurality of adjacent two-tone optical frequency conjugate pairs. Each conjugate pair includes a first optical tone carrying a modulated data signal, and a second optical tone carrying a reference local oscillator signal. The optical transport medium transports the plurality of two-tone conjugate pairs to the plurality of radio base stations, and each base station receives at least one conjugate pair at an optical front end thereof. The optical front end separates the first optical tone from the second optical tone, and converts the first optical tone into a millimeter-wave radio frequency electrical signal.

Abstract: A method for extracting a plurality of data streams from a time-frequency division multiplexed (TFDM) signal includes determining a plurality of sub-channels of the TFDM signal, where each of the plurality of sub-channels has a respective one of a plurality of frequency ranges. The method also includes down-converting, based on the plurality of frequency ranges, the TFDM signal into a plurality of down-converted signals, where each down-converted signal corresponds to a respective one of the plurality of sub-channels. The method also includes extracting the plurality of data streams from a respective one of the plurality of down-converted signals.

Abstract: An injection locked transmitter for an optical communication network includes a master seed laser source input substantially confined to a single longitudinal mode, an input data stream, and a laser injected modulator including at least one slave laser having a resonator frequency that is injection locked to a frequency of the single longitudinal mode of the master seed laser source. The laser injected modulator is configured to receive the master seed laser source input and the input data stream, and output a laser modulated data stream.

Abstract: A sowing device changes a depth of wheat sowing includes an external skeleton, where one side of the external skeleton is fixedly connected with a connection part for articulated with a tractor; a main board slidably connected to an interior of the external skeleton and a seeding unit below the main board; a support frame fixedly connected to the main board; a plow blade for slotting land rotatably connected to a bottom of the support frame; a rotary roller below the external skeleton and rotationally connected thereto. The main board is moved downwards to drive a straight toothed plate fixedly connected to the main board to move downwards; the straight toothed plate is moved upwards through a meshing effect of a gear to cause L-shaped toothed plate to move upwards to squeeze a horizontal plate to move upwards.

Abstract: An echo cancellation method includes steps of (a) extracting phase-distortion estimates, (b) reconstructing an echo signal, (c) generating a clean signal, and (d) producing a primary signal. Step (a) includes extracting, from a first phase signal, a plurality of phase-distortion estimates, the first phase signal having been estimated from an echo-corrupted signal received at a first coherent transceiver of a coherent optical network. Step (b) includes reconstructing an echo signal from the plurality of phase-distortion estimates and a transmitted signal transmitted by the first coherent transceiver. Step (c) includes generating a clean signal as a difference between the reconstructed echo signal and the first phase signal. Step (d) includes producing a primary signal by mapping each of a plurality of clean-phase estimates of the clean signal to one of a plurality of constellation symbols associated with a modulation scheme of the primary signal.

Abstract: A method for generating optical communication signals in a communication network includes (1) generating at least a first optical tone and a second optical tone using a quantum dot (QD) coherent comb laser (CCL), the first and second optical tones having different respective wavelengths, (2) modulating the first optical tone according to a first modulation signal to generate a first communication signal, and (3) modulating the second optical tone according to a second modulation signal to generate a second communication signal.

Abstract: An example operation may include one or more of receiving a loan application of a user, extracting a plurality of personal attributes about the user from the loan application, querying a machine learning model via an application programming interface (API) based on the plurality of attributes about the user to identify one or more rules for auto-adjudicating the loan application, determining whether or not to approve the loan application based on the one or more rules identified via the machine learning model, and transmitting notice of the determination to a device associated with the user.

Abstract: An example operation may include one or more of assigning different criteria to a plurality of nodes of a decision tree model, respectively, iteratively executing the decision tree model on a plurality of training data which causes the plurality of training data to be assigned to the plurality of nodes of the decision tree model based on the different criteria assigned to the plurality of nodes, identifying nodes among the plurality of nodes within the decision tree model which have a purity above a predetermined purity threshold, generating a set of rules based on the identified nodes which have the purity above the predetermined purity threshold, and embedding the set of rules within the decision tree model and storing the decision tree model within a storage device.

Abstract: A method for estimating a chromatic dispersion of an optical-fiber channel is disclosed includes receiving, via the optical-fiber channel, a chromatically-dispersed signal having a symbol rate 1/T. The method also includes, for each chromatic-dispersion value of a plurality of chromatic-dispersion values, determining a respective clock-tone magnitude by: (i) applying, to the chromatically-dispersed signal or a signal derived therefrom, a chromatic dispersion equal to the chromatic-dispersion value to generate a dispersion-compensated signal, and (ii) extracting the clock-tone magnitude from at least one of a positive-frequency clock-tone and a negative-frequency clock-tone of the dispersion-compensated signal, the positive-frequency clock-tone and the negative-frequency clock-tone being spectral components of the dispersion-compensated signal at temporal frequencies 1/T or ?1/T respectively. The method also includes determining a maximum of the extracted clock-tone magnitudes.

Abstract: A method for controlling a device, including: determining a distance state between a keyboard and a terminal device, the keyboard is in communication connection with the terminal device; in a case that the distance state is a distant state, adjusting a state of a screen of the terminal device to a wake-up state, and obtaining a first position of the keyboard and a second position of the terminal device; determining an angle between the keyboard and the screen of the terminal device according to the first position and the second position; and adjusting a state of the keyboard according to the angle.

Abstract: A method for distributed fiber optic sensing (DFOS) includes (a) generating first data signals for transmission via a first fiber optic strand, (b) generating first sensing signals for transmission via the first fiber optic strand, and (c) analyzing at least one of first back-scattering signals and first forward-scattering signals of the first sensing signals, to perform DFOS. The method may further include generating the first sensing signal such that presence of the first sensing signal on the first fiber optic strand does not interfere with transmission of the first data signal by the first fiber optic strand.

Abstract: A full duplex communication network includes an optical transmitter end having a first coherent optics transceiver, an optical receiver end having a second coherent optics transceiver, and an optical transport medium operably coupling the first coherent optics transceiver to the second coherent optics transceiver. The first coherent optics transceiver is configured to simultaneously transmit a downstream optical signal and receive an upstream optical signal. The second coherent optics transceiver is configured to simultaneously receive the downstream optical signal from the first coherent optics transceiver and transmit the upstream optical signal first coherent optics transceiver. At least one of the downstream optical signal and the upstream optical signal includes at least one coherent optical carrier and at least one non-coherent optical carrier.

Abstract: A receiver is provided for processing an input signal from a communication network. The receiver includes a processor and a memory configured to store computer executable instructions, which, when executed by the processor, cause the processor to (i) receive an input data signal including digital bit information, (ii) code the input data signal into a plurality of multi-level symbols, (iii) map the plurality of multi-level symbols into a plurality of constellation points in the phase domain, (iv) execute a first phase recovery subprocess on the plurality of constellation points to recover a first carrier phase of the input signal, (v) implement a Gaussian mixture model (GMM) on the recovered first carrier phase to generate an enhanced recovered carrier phase, and (vi) process the enhanced recovered carrier phase with a second phase recovery subprocess to reduce distortion from the input signal.

Abstract: A digital receiver is configured to process a polarization multiplexed carrier from a communication network. The polarization multiplexed carrier includes a first polarization and a second polarization. The receiver includes a first lane for transporting a first input signal of the first polarization, a second lane for transporting a second input signal of the second polarization, a dynamic phase noise estimation unit disposed within the first lane and configured to determine a phase noise estimate of the first input signal, a first carrier phase recovery portion configured to remove carrier phase noise from the first polarization based on a combination of the first input signal and a function of the determined phase noise estimate, and a second carrier phase recovery portion configured to remove carrier phase noise from the second polarization based on a combination of the second input signal and the function of the determined phase noise estimate.