An example apparatus includes a mode selective detector, a measurement module, a difference calculator and a threshold and alarm module. The mode selective detector detects a plurality of modes of a spatially multiplexed signal. The measurement module measures a parameter for the plurality of modes of the spatially multiplexed signal, wherein the parameter is a power or a signal to noise ratio (SNR). The difference calculator compares the measured parameter among a subset modes and/or among a known set of unperturbed parameters and determines a differential, the subset including at least one mode. The threshold and alarm module sets an alarm indicator when the differential is out of bounds.

Embodiments may provide a way of communicating via an electromagnetic radiator, or light source, that can be amplitude modulated such as light emitting diode (LED) lighting and receivers or detectors that can determine data from light received from the amplitude modulated electromagnetic radiator. Some embodiments may provide a method of transmitting/encoding data via modulated LED lighting and other embodiments may provide receiving/decoding data from the modulated LED lighting by means of a device with a low sampling frequency such as a relatively inexpensive camera (as might be found in a smart phone). Some embodiments are intended for indoor navigation via photogrammetry (i.e., image processing) using self-identifying LED light anchors. In many embodiments, the data signal may be communicated via the light source at amplitude modulating frequencies such that the resulting flicker is not perceivable to the human eye.

Embodiments may provide a way of communicating via an electromagnetic radiator, or light source, that can be amplitude modulated such as light emitting diode (LED) lighting and receivers or detectors that can determine data from light received from the amplitude modulated electromagnetic radiator. Some embodiments may provide a method of transmitting/encoding data via modulated LED lighting and other embodiments may provide receiving/decoding data from the modulated LED lighting by means of a device with a low sampling frequency such as a relatively inexpensive camera (as might be found in a smart phone). Some embodiments are intended for indoor navigation via photogrammetry (i.e., image processing) using self-identifying LED light anchors. In many embodiments, the data signal may be communicated via the light source at amplitude modulating frequencies such that the resulting flicker is not perceivable to the human eye.

Embodiments of the present application disclose various light-communication sending methods and apparatus, various light-communication receiving methods and apparatus, and various light communication systems. A light-communication sending method comprises: acquiring a first region of an image; determining, according to the first region, information about density distribution of communication information that is to be modulated to light emitted by a light source; and controlling the light source to display the image, and during displaying of the image, modulating, according to the information about the density distribution of the communication information, the communication information to the light emitted by the light source. A light-communication receiving method comprises: acquiring a first region of an image; adjusting pixel density distribution of an image sensor according to the first region; and capturing the image by using the adjusted image sensor, and during capturing of the image, receiving communication information modulated by a transmit end to light emitted by a light source that displays the image. The present application helps implement capturing of an image of differentiated definition and receiving of differentiated communication information density by a receiver end, and improves the transmission efficiency of communication information.

Embodiments of the present application disclose various light-communication sending methods and apparatus, various light-communication receiving methods and apparatus, and various light communication systems. A light-communication sending method comprises: acquiring a first region of an image; determining, according to the first region, information about density distribution of communication information that is to be modulated to light emitted by a light source; and controlling the light source to display the image, and during displaying of the image, modulating, according to the information about the density distribution of the communication information, the communication information to the light emitted by the light source. A light-communication receiving method comprises: acquiring a first region of an image; adjusting pixel density distribution of an image sensor according to the first region; and capturing the image by using the adjusted image sensor, and during capturing of the image, receiving communication information modulated by a transmit end to light emitted by a light source that displays the image. The present application helps implement capturing of an image of differentiated definition and receiving of differentiated communication information density by a receiver end, and improves the transmission efficiency of communication information.

A wireless power receiver includes one or more tunable capacitors in parallel with an inductor. The wireless power receiver adapted to receive an induced voltage input at the inductor due to a magnetic field generated by a wireless power transmitter. The rectifier has an output with a rectified voltage and a rectified current. A controller has a first input for receiving a signal representative of the rectified voltage and a first output for supplying an adjustment signal to the tunable capacitor. The controller includes a processor coupled to the first input and is configured to operate on the signal representative of rectified voltage to produce a desired capacitance value for capacitor and provide the adjustment signal determined so as to adjust a capacitance value of capacitor to the desired capacitance value.

A wireless power receiver includes one or more tunable capacitors in parallel with an inductor. The wireless power receiver adapted to receive an induced voltage input at the inductor due to a magnetic field generated by a wireless power transmitter. The rectifier has an output with a rectified voltage and a rectified current. A controller has a first input for receiving a signal representative of the rectified voltage and a first output for supplying an adjustment signal to the tunable capacitor. The controller includes a processor coupled to the first input and is configured to operate on the signal representative of rectified voltage to produce a desired capacitance value for capacitor and provide the adjustment signal determined so as to adjust a capacitance value of capacitor to the desired capacitance value.

A packaged integrated white light source configured for illumination and communication or sensing comprises one or more laser diode devices. An output facet configured on the laser diode device outputs a laser beam of first electromagnetic radiation with a first peak wavelength. The first wavelength from the laser diode provides at least a first carrier channel for a data or sensing signal.

A system for transmission of optical data signals has first optical processing circuitry for receiving a plurality of digital signals and applying at least one of a Hermite-Gaussian function, a Laguerre-Gaussian function or an Ince-Gaussian function to each of the received plurality of digital signals. The first optical processing circuitry also combines each of the at least one of the Hermite-Gaussian function, the Laguerre-Gaussian function or the Ince-Gaussian function applied plurality of digital signals into a single carrier signal. An optical transmitter transmits the single carrier signal. An optical receiver receives the transmitted single carrier signal. Second optical processing circuitry separates the at least one of the Hermite-Gaussian function, the Laguerre-Gaussian function or the Ince-Gaussian function applied digital signals of the single carries signal into separate signals and removes the at least one of the Hermite-Gaussian function, the Laguerre-Gaussian function or the Ince-Gaussian function applied to each of the plurality of digital signals. An elliptical core fiber transmits the single carrier signal from the optical transmitter to the optical receiver. The elliptical core fiber includes an elliptical core have a major axis and a minor axis.

An optoelectronic module management system includes a network connection communicatively coupled to an optoelectronic module, a memory, and a processing device operatively coupled to the memory. The processing device is configured to perform or control performance of operations that include identify the optoelectronic module via a management network. The optoelectronic module includes a management communication element that is communicatively coupled to the management network and an optical communication element that is communicatively coupled to a fiber optic cable. The operations further include add the optoelectronic module to a list of monitored devices, monitor the optoelectronic module, provide a service to the optoelectronic module in response to the monitoring, and generate a report of the service provided to the optoelectronic module.