Abstract: A system for determining the location of a mobile receiver unit includes static transmitter units, each including a respective clock which it uses to transmit a positioning signal according to a respective transmission schedule. The mobile receiver unit receives a positioning signal from any of the static transmitter units. A first processing means uses information relating to the received positioning signal to determine the location of the mobile receiver unit. A second processing means uses information relating to a respective drift and/or offset of each of the clocks of the static transmitter units to generate transmission schedules for the static transmitter units. Each transmission schedule instructs a respective static transmitter unit to transmit a positioning signal at one or more scheduled times according to the clock of the static transmitter unit.

Abstract: A system for determining the location of a mobile receiver unit includes static transmitter units, each including a respective clock which it uses to transmit a positioning signal according to a respective transmission schedule. The mobile receiver unit receives a positioning signal from any of the static transmitter units. A first processing means uses information relating to the received positioning signal to determine the location of the mobile receiver unit. A second processing means uses information relating to a respective drift and/or offset of each of the clocks of the static transmitter units to generate transmission schedules for the static transmitter units. Each transmission schedule instructs a respective static transmitter unit to transmit a positioning signal at one or more scheduled times according to the clock of the static transmitter unit.

Abstract: A system for determining the location of a mobile receiver unit includes static transmitter units, each including a respective clock which it uses to transmit a positioning signal according to a respective transmission schedule. The mobile receiver unit receives a positioning signal from any of the static transmitter units. A first processing means uses information relating to the received positioning signal to determine the location of the mobile receiver unit. A second processing means uses information relating to a respective drift and/or offset of each of the clocks of the static transmitter units to generate transmission schedules for the static transmitter units. Each transmission schedule instructs a respective static transmitter unit to transmit a positioning signal at one or more scheduled times according to the clock of the static transmitter unit.

Abstract: A system for determining the location of a mobile receiver unit includes static transmitter units, each including a respective clock which it uses to transmit a positioning signal according to a respective transmission schedule. The mobile receiver unit receives a positioning signal from any of the static transmitter units. A first processing means uses information relating to the received positioning signal to determine the location of the mobile receiver unit. A second processing means uses information relating to a respective drift and/or offset of each of the clocks of the static transmitter units to generate transmission schedules for the static transmitter units. Each transmission schedule instructs a respective static transmitter unit to transmit a positioning signal at one or more scheduled times according to the clock of the static transmitter unit.

Abstract: The present invention provides method steps for manufacturing an assembly of adjustable lenses on a wafer. The method steps provide an easy manufacturing of such lenses, minimizing the cost of assembly, and at the same time provide a solution for mass production of compact adjustable lenses for use in mobile phones, etc.

Abstract: The present invention is related to a lens assembly comprising a flexible lens body (10) inside a cavity bounded by a sidewall (11) and a first transparent cover (13), and a second transparent cover (14), wherein both covers (13,14) are in contact with respective surfaces of the lens body (10). Piezo electric elements (12) shapes the lens body (10) when activated, thereby adjusting the focal length of the lens assembly.

Abstract: The present invention provides a solution for designing a compact adjustable lens assembly, wherein a circular shaped piezoelectric crystal is bending a thin glass cover, thereby providing a shift of focal length of the lens assembly.

Abstract: The present invention is related to a lens assembly comprising a flexible lens body (10) inside a cavity bounded by a sidewall (11) and a first transparent cover (13), and a second transparent cover (14), wherein both covers (13,14) are in contact with respective surfaces of the lens body (10). Piezo electric elements (12) shapes the lens body (10) when activated, thereby adjusting the focal length of the lens assembly.

Abstract: A buried heterojunction laser optically coupled with a buried waveguide electro-absorption (EA) optical modulator via an active layer is fabricated on a substrate carrying a number of deposited semiconductor layers. The laser component includes a laser current conduction region and an adjacent laser current confinement region. The waveguide component includes a waveguide current confinement region comprising first and second current blocking structures formed from different grown semiconductor layers. An extension of the first current blocking structure is interposed between the second current blocking structure and the waveguide current conduction region. Because each of the components is flanked by current confinement regions of differing structures, the resistive and capacitative properties of the current confinement regions can be selected to optimise the performance of that component for a particular use.

Abstract: An integrated buried heterojunction laser optically coupled to a ridge waveguide electro-absorption (EA) optical modulator having a raised ridge structure is manufactured on a single semiconductor substrate on which a plurality of semiconductor layers are grown, including at least one active layer through which optical radiation is coupled from the laser to the waveguide. Semiconductor layers above the active layer form a laser current conduction region and semiconductor layers adjacent the active layer form a laser current confinement region. The ridge structure is formed from one or more layers also used to form the laser current conduction region. The layers used to form the laser current confinement region do not extend adjacent the ridge structure.

Abstract: A buried heterojunction laser optically coupled with a buried waveguide electro-absorption (EA) optical modulator via an active layer is fabricated on a substrate carrying a number of deposited semiconductor layers. The laser component includes a laser current conduction region and an adjacent laser current confinement region. The waveguide component includes a waveguide current confinement region comprising first and second current blocking structures formed from different grown semiconductor layers. An extension of the first current blocking structure is interposed between the second current blocking structure and the waveguide current conduction region. Because each of the components is flanked by current confinement regions of differing structures, the resistive and capacitative properties of the current confinement regions can be selected to optimise the performance of that component for a particular use.

Abstract: An integrated buried heterojunction laser optically coupled to a ridge waveguide electro-absorption (EA) optical modulator having a raised ridge structure is manufactured on a single semiconductor substrate on which a plurality of semiconductor layers are grown, including at least one active layer through which optical radiation is coupled from the laser to the waveguide. Semiconductor layers above the active layer form a laser current conduction region and semiconductor layers adjacent the active layer form a laser current confinement region. The ridge structure is formed from one or more layers also used to form the laser current conduction region. The layers used to form the laser current confinement region do not extend adjacent the ridge structure.