Abstract:
An apparatus can include a nasal cannula assembly, which includes a face piece. The face piece includes a plenum portion and a nasal interface portion. The plenum portion is configured to be coupled to a supply line and defines a flow path configured to receive an aerosol flow from the supply line. The nasal interface portion includes a first delivery protrusion and a second delivery protrusion. The first delivery protrusion is configured to convey a first portion of the aerosol flow to a first nostril, and the second delivery protrusion is configured to deliver a second portion of the aerosol flow to a second nostril. The plenum portion includes a sidewall having a curved surface configured to redirect the second portion of the aerosol flow towards the second delivery protrusion. The sidewall is configured to isolate the flow path from a volume downstream from the second delivery protrusion.
Abstract:
A method of modifying the stiffness properties of a material by imparting grooves or cross sectional shapes to a surface or multiple surfaces of the material is described. Materials made by this method, and products made with the material, such as nasal dilators, packaging, construction materials and medical devices, are also described.
Abstract:
A system for generating and detecting terahertz radiation comprises a first laser (1) and a second laser (2), each having a different frequency of laser light output. The system further comprises a radiation generating stage (4, 9) arranged to generate terahertz radiation by beating the light output of the first laser (1) with the light output of the second laser (2). A radiation detecting stage (12) is arranged to modulate light output from the first laser (1) with received terahertz radiation.
Abstract:
A monitor unit (1) for detecting physical interference of a communications fibre (4) in a transmission system (2) comprises a monitor circuit (9) coupled to the communications fibre (4). A portion of a signal being transmitted along the communications fibre (4) is coupled out of the fibre (4) and into the monitor unit (1). A filter (8) allows only one of two orthogonal polarisation field components to pass through it to the monitor circuit (9). By detecting fluctuations in the polarisation state of the filtered optical signal, the monitor circuit (9) allows the detection of external influences to be determined.
Abstract:
Apparatus for generating of a comb having a large number optical teeth and comprises an optical loop (3) including an optical amplifier (5) a frequency shifter (4) and an optical filter (6). A signal from a laser (9) is partially coupled into the loop by a coupler (7) such that a part of it is output at output port (10). The signal in the loop (the feedback signal) is amplified by the amplifier (5) and frequency shifted by the frequency shifter (4) and is then partially coupled out of the loop by coupler (7). The part coupled out of the loop (the output signal) exits via output port (10). This process is repeated to produce the desired number of output signals exiting via output port (10). The signal from the laser (9) may be continuous or pulsed.
Abstract:
An optical interconnection network comprises an optical bus (60) formed by a D-fibre (62) embedded in a thermoplastic substrate (64) with the flat of the D-fibre (62) flush with the top surface of the substrate. A module (70) similarly constructed is dimensioned to be a push fit in a wall structure (65) formed on the substrate (64) with the fibres (72) and (62) in a position to evanescently couple optical signals from one fibre to the other.
Abstract:
An optical communication system comprises a transmission assembly (3) including a semiconductor laser amplifier (4). The laser amplifier (4) superimposes onto an amplitude modulated signal a phase modulation corresponding to the amplitude modulation. The optical communication system may further include a separation device for filtering out the amplitude modulation. A receiving assembly (7) is provided for detecting the phase modulation of a transmitted signal.
Abstract:
A method for generating an optical single sideband signal comprising the steps of splitting an optical field into two parts and introducing a relative phase delay of +/- π/4 radians in each direction of transmission to one of the parts, intensity reflection-modulating each part with electrical signals having a relative phase delay of +/- π/2 radians and then recombining the reflection-modulated signals.
Abstract translation:一种用于产生光学单边带信号的方法,包括以下步骤:将光场分成两部分,并将每个传输方向上的+/- p / 4弧度的相对相位延迟引入到所述部分之一,对每个部分进行强度反射调制 电信号具有+/- p / 2弧度的相对相位延迟,然后重组反射调制信号。
Abstract:
A method of modifying the stiffness properties of a material by imparting grooves or cross sectional shapes to a surface or multiple surfaces of the material is described. Materials made by this method, and products made with the material, such as nasal dilators, packaging, construction materials and medical devices, are also described.
Abstract:
An optical homodyne detection system comprises a source of optical radiation such as an external cavity laser (7). A directional coupler (8) receives optical radiation from the source (7) and couples the radiation in one direction into an optical waveguide (5) such as an optical fibre in which, in use, a modulated optical wave having carrier and data components travels in the opposite direction. The characteristics of the injected radiation from the source (7) and the form of the waveguide (5) are such that stimulated Brillouin scattering occurs whereby the carrier component of the modulated optical carrier wave is amplified. Demodulating means (10) is provided to which the optical wave with the amplified carrier component is fed.