A rare earth element-doped multiple-core optical fiber 31 has a bundle of cores 32-1 ~ 32-7 co-doped with Er and Al, primary cladding layers 33 covering each core, and an outer cladding layer 34 covering all cores 32-1 ~ 32-7, wherein one core 32-1 being positioned substantially on a central axis of the outer cladding layer and surrounded by other six cores 32-2 ~ 32-7. A core diameter Dc of the c...

An earmuff assembly comprising two earmuffs (10) each provided with a respective sealing ring (12). A fork-shaped member (14) is pivotally connected on the one hand - at the end of each fork leg - to a corresponding earmuff (10) and on the other hand - centrally - to a resilient headstrap unit (16) at its other end. When the earmuff assembly is not in use, the earmuffs (10) can be collapsed toward...

An earmuff assembly comprising two earmuffs (10) each provided with a respective sealing ring (12). A fork-shaped member (14) is pivotally connected on the one hand - at the end of each fork leg - to a corresponding earmuff (10) and on the other hand - centrally - to a resilient headstrap unit (16) at its other end. When the earmuff assembly is not in use, the earmuffs (10) can be collapsed toward...

Optical signals are dispersed according to their wavelength by an optical path length difference generator that couples a single pathway conveying a plurality of different wavelength signals to multiple pathways separately conveying the different wavelength signals. The optical path length generator can be formed by a reflective stack having a plurality of partially reflective surfaces for reflect...

The device includes two or more communications parts (106A,114A) which form part of a CAN-system, respectively between the CAN-system and a control unit, and which are communicable via one or more wireless connections. When a transmission is made from a first transmission part (114A) to a second communication part (106A), the parts operate with a signal protocol which takes no account of arbitrati...

The device includes two or more communications parts (106A,114A) which form part of a CAN-system, respectively between the CAN-system and a control unit, and which are communicable via one or more wireless connections. When a transmission is made from a first transmission part (114A) to a second communication part (106A), the parts operate with a signal protocol which takes no account of arbitrati...