An optical amplifier comprising: an optical coupler configured to receive a communication signal and couple said communication signal to an optical connector of a doped optical fibre; and at least one electrical to optical data converter connected to the optical coupler to provide pump radiation thereto.

An optical amplifier comprising: an optical coupler configured to receive a communication signal and couple said communication signal to an optical connector of a doped optical fibre; and at least one electrical to optical data converter connected to the optical coupler to provide pump radiation thereto.

The present disclosure provides optical link management in a marine seismic environment. A first device can transmit, to a second device, a first optical transmission at a first output level. The first optical transmission can include a first packet corresponding to a network protocol. The first device can determine that the second device failed to receive the first packet via the first optical transmission. The first device can transmit, responsive to failure of the first optical transmission, a second optical transmission at a second output level different than the first output level. The second optical transmission can include a second packet corresponding to the network protocol. The first device can identify that the second packet was successfully received by the second link manager agent. The first device can establish, responsive to the identification that the second packet was successfully received, the second output level as a transmission output level for the first device.

The present disclosure provides optical link management in a marine seismic environment. A first device can transmit, to a second device, a first optical transmission at a first output level. The first optical transmission can include a first packet corresponding to a network protocol. The first device can determine that the second device failed to receive the first packet via the first optical transmission. The first device can transmit, responsive to failure of the first optical transmission, a second optical transmission at a second output level different than the first output level. The second optical transmission can include a second packet corresponding to the network protocol. The first device can identify that the second packet was successfully received by the second link manager agent. The first device can establish, responsive to the identification that the second packet was successfully received, the second output level as a transmission output level for the first device.

A method of obtaining data from a subsea control module of an underwater well facility is provided. The method comprises: providing a tag which stores data relating to the module, the tag being operable to wirelessly transmit the data to a reader device; locating the tag at the module; providing a reader device; and interrogating the tag using the reader device, such that the tag is caused to wirelessly transmit the data to the reader device, wherein the tag is communicatively connected to a subsea electronics module for receiving information therefrom.

A subsea system comprises a multiplicity of subsea installations (M-1 . . . M-n) and a common transmission line (2a) in an umbilical for the conveyance of power or data communication electrical signals to the subsea installations. The system provides on the common transmission line a plurality of safety signals (T-1 . . . T-n) in the form of tones separate in frequency from each other and the other signals on the line. Each subsea installation is arranged to receive from the common transmission line selectively a respective one of the safety signals for the control of a fail-safe device (9) in the installation.

A method and an electronic device for selecting a home network device (HND) using a controller in a home network is disclosed. The method and the electronic device relate to a sensor network, Machine Type Communication (MTC), Machine-to-Machine (M2M) communication, and technology for Internet of Things (IoT). The method and the electronic device may be applied to intelligent services based on the above technologies, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The method and the electronic device for selecting and controlling a home network device (HND) in a home network using a controller and a light source are provided. The method includes selecting the HND based on a light signal from a light source, and obtaining identification information of the HND.

In some embodiments, an apparatus and a system, as well as a method and an article, may operate to transmit and receive data. Transmission may comprise transforming larger values of acquired data into smaller values of transformed data using a transform defined by a seed value selected to reduce digital pulse position modulation transmission time for the acquired data. Additional activities include digital pulse position modulating the transformed data and a checksum associated with the transformed data to provide a propagation signal, and transmitting the propagation signal into drilling fluid or a geological formation. Reception may comprise receiving the propagation signal, demodulating the propagation signal to extract the transformed data and the checksum, and transforming the transformed data into an estimate of the acquired data, using the transform defined by the seed value validated by the checksum. Additional apparatus, systems, and methods are described.

In some embodiments, an apparatus and a system, as well as a method and an article, may operate to transmit and receive data. Transmission may comprise transforming larger values of acquired data into smaller values of transformed data using a transform defined by a seed value selected to reduce digital pulse position modulation transmission time for the acquired data. Additional activities include digital pulse position modulating the transformed data and a checksum associated with the transformed data to provide a propagation signal, and transmitting the propagation signal into drilling fluid or a geological formation. Reception may comprise receiving the propagation signal, demodulating the propagation signal to extract the transformed data and the checksum, and transforming the transformed data into an estimate of the acquired data, using the transform defined by the seed value validated by the checksum. Additional apparatus, systems, and methods are described.

The present disclosure provides a system which collects data from a set of sensors installed on underground vehicles which is then transferred to a remote data collection node through multiple communication protocol/channels according to priority calculations. Data priority is defined based on the evaluation of individual criteria and a set of weights. Priorities, weights and criteria can be dynamically adjusted depending on environmental factors. The protocol, channel and transfer order will depend upon calculated priorities.