Techniques are disclosed for spatially resolving received light-based communication (LCom) signals. In an example case where one or more LCom signals are in the field of view (FOV) of an LCom receiver, the image representing the FOV may be captured and segmented into non-overlapping cells, such as hexagonal, triangular, rectangular, or circular shaped cells. Each LCom signal may be interpreted as a unique pixel cluster comprising one or more of the cells. In some cases, the LCom signals in the FOV may be received from multiple LCom-enabled luminaires and/or a single LCom-enabled luminaire having multiple light panels. The benefits of being able to spatially resolve received LCom signals may include establishing a link with multiple LCom signals within the FOV of a receiver without conflict and/or determining the location of those LCom signals, improving signal to noise ratio, augmenting position information, enhancing sampling frequency, and improving communication speed.

Techniques are disclosed for providing proper raster line alignment of a camera or other light-sensing device of a receiver device relative to a transmitting light-based communication (LCom)-enabled luminaire to establish reliable LCom there between. In accordance with some embodiments, proper alignment can be provided automatically (e.g., by the receiver device and/or other suitable controller). In accordance with some embodiments, proper alignment can be provided by the user. In some instances in which a user is to be involved in the alignment process, the receiver device may be configured, for example, to instruct or otherwise guide the user in the process of properly aligning the receiver device relative to a given transmitting LCom-enabled luminaire.

Apparatus for controlling one or more light sources to emit coded light which is modulated to embed a signal. The apparatus comprises: an interface for receiving information relating to two or more exposure times of one or more cameras on one or more devices, the one or more cameras being operable to detect the coded light based on the modulation; and a controller configured to select at least one property of the modulation, based on the information, such that the modulation is detectable at each of said two or more exposure times.

Techniques are disclosed for providing proper raster line alignment of a camera or other light-sensing device of a receiver device relative to a transmitting light-based communication (LCom)-enabled luminaire to establish reliable LCom there between. In accordance with some embodiments, proper alignment can be provided automatically (e.g., by the receiver device and/or other suitable controller). In accordance with some embodiments, proper alignment can be provided by the user. In some instances in which a user is to be involved in the alignment process, the receiver device may be configured, for example, to instruct or otherwise guide the user in the process of properly aligning the receiver device relative to a given transmitting LCom-enabled luminaire.

Multiple panel luminaires for light-based communication (LCom) and related techniques of use are disclosed. Each luminaire panel may comprise at least one solid-state light source, where the light sources are configured to output light. The luminaire may also include at least one modulator configured to modulate the light output of the light sources to allow for emission of LCom signals. The luminaire may also include a controller configured to synchronize timing of the LCom signals. In some cases, one panel may be configured to emit an LCom signal that is the inverse or duplicate of the LCom signal emitted from another panel. Panel signal inversion may be used to maintain a relatively constant level of light output from the luminaire and/or to create a virtual fiducial to provide orientation information. Using a multiple panel luminaire to transmit data may also result in improved data transmission rates and transmission reliability.

A method for tuning a power characteristic of an optical frequency comb includes controlling a modulating light source according to a plurality of modulation parameters to generate an optical frequency comb including a plurality of optical tones. Additionally, at least one of the plurality of modulation parameters is changed until a total power of the plurality of optical tones is greater than or equal to a minimum threshold value. Furthermore, at least one of the plurality of modulation parameters are changed until respective powers of each of the plurality of optical tones are within a predetermined proximity to respective target powers of each of the plurality of optical tones.

The present invention provide a laser, where the laser is divided into a laser region and a grating adjustment region through a first electrical isolation layer; the laser region is configured to generate optical signals, where the optical signals include an optical signal with a wavelength corresponding to a 0 signal and an optical signal with a wavelength corresponding to a 1 signal; the grating adjustment region is configured to adjust a wavelength of the grating adjustment region by controlling current of the grating adjustment region, so that the optical signal with the wavelength corresponding to the 1 signal of the laser region passes through the grating adjustment region, and the optical signal with the wavelength corresponding to the 0 signal of the laser region returns to the laser region, thereby implementing suppression to chirp of a directly modulated laser.

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 waveform in the form of chips at a chipping clock frequency that switch a light source between on and off states to communicate via light sources that can be amplitude modulated such as LED lighting. Some embodiments may provide a method of transmitting the waveform via modulated LED lighting. 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.

A method and apparatus for wavelength control in an optical communication system, and a coherent optical communication apparatus. The method includes: setting an initial emission wavelength emitted by an emitting-end light source in an optical communication system; controlling a local oscillator light source at a receiving end in the optical communication system to emit a local oscillator wavelength; controlling a receiving end to receive the wavelength emitted by the emitting-end light source; and adjusting the wavelength emitted by the local oscillator light source in real time, such that the wavelength emitted by the local oscillator light source is consistent with the wavelength received by the receiving end.

A cable network system comprises: a headend; a node communicatively coupled to the headend via digital fiber-optic links, the node implementing one or more of Remote PHY (RPHY) or Remote MAC (RMAC) protocols; wherein the node comprises a first electro-optical converter configured to convert a baseband digital signal into a Frequency-Division Multiplexed (FDM) optical signal; and wherein the node is configured to send the FDM optical signal over an optical cable to a second electro-optical converter located at a user's premises, and receive an FDM optical signal from the user's premises. The sent and received FDM optical signals may be wavelength division multiplexed such that they may have at least partially overlapping frequency bands.