Abstract: A method of assembling an optical sensor for measuring pressure and/or temperature is disclosed. The optical sensor is adapted for use in high temperature environments, such as gas turbines and other engines. The method comprises fabricating a sensor element formed of a pill having an enclosed cavity, bonding the pill to a front end of a spacer, bonding a lens to the back end of the spacer to form the optical assembly, aligning an optical fiber to the optical assembly, and fixing the fiber in position by fusing the fiber to the lens.

Abstract: A method of assembling an optical sensor for measuring pressure and/or temperature is disclosed. The optical sensor is adapted for use in high temperature environments, such as gas turbines and other engines. The method comprises fabricating a sensor element formed of a pill having an enclosed cavity, bonding the pill to a front end of a spacer, bonding a lens to the back end of the spacer to form the optical assembly, aligning an optical fibre to the optical assembly, and fixing the fibre in position by fusing the fibre to the lens.

Abstract: An optical sensor is disclosed for measuring pressure and/or temperature. The optical sensor is adapted for use in high temperature environments, such as gas turbines and other engines. The optical sensor comprises an optical assembly having a sensor element, a spacer and a lens arranged along the optical axis. The sensor element is spaced from the lens by the spacer. An optical fiber is coupled to the optical assembly for illuminating the sensor element. The optical assembly is resiliently mounted in a housing such that the optical assembly is insulated from shock to the housing. There is also disclosed a method of assembling the optical sensor.

Abstract: An optical sensor is disclosed for measuring pressure and/or temperature. The optical sensor is adapted for use in high temperature environments, such as gas turbines and other engines. The optical sensor comprises an optical assembly having a sensor element, a spacer and a lens arranged along the optical axis. The sensor element is spaced from the lens by the spacer. An optical fibre is coupled to the optical assembly for illuminating the sensor element. The optical assembly is resiliently mounted in a housing such that the optical assembly is insulated from shock to the housing. There is also disclosed a method of assembling the optical sensor.

Abstract: An illumination system comprises at least one light source (2) and a light-guide (1). A first part of the light-guide (1) is defined by a surface (12) for light emission and a back surface (13), and a second part of the light-guide is defined by a light receiving surface (14) and a light reflecting surface (15). The light source (2) is disposed adjacent or substantially adjacent to the light receiving surface (14), and light from the light source enters the light-guide through the light receiving surface (14), and is reflected by the light reflecting surface (15) into the first part of the light-guide. Light is emitted from the waveguide through the surface (12) for light emission, and may be used to illuminate, for example, a display device placed over the surface (12) for light emission. The light source and the light receiving surface are on the same side of the waveguide as the surface for light emission.

Abstract: An illumination system comprises at least one light source (2) and a light-guide (1). A first part of the light-guide (1) is defined by a surface (12) for light emission and a back surface (13), and a second part of the light-guide is defined by a light receiving surface (14) and a light reflecting surface (15). The light source (2) is disposed adjacent or substantially adjacent to the light receiving surface (14), and light from the light source enters the light-guide through the light receiving surface (14), and is reflected by the light reflecting surface (15) into the first part of the light-guide. Light is emitted from the waveguide through the surface (12) for light emission, and may be used to illuminate, for example, a display device placed over the surface (12) for light emission. The light source and the light receiving surface are on the same side of the waveguide as the surface for light emission.

Abstract: An optical coupling between an optical component (9), e.g. a light source, and a waveguide, such as a silica on silicon waveguide, the waveguide comprising a core (3) and cladding layer (4) of a first material (SiO2?) supported on a first s of a second material (Si), the core (3) being spaced from the first substrate (1) by a known distance, wherein recesses (5) are formed through the cladding layer (4) to the first substrate (1) and the optical component (9) comprises, or is mounted on a second substrate (7) which comprises, projections (8) of known length, each projection (8) being located in contact with the first substrate (1) within a respective recess (5) so that the optical component (9) is positioned in a known location relative to the first substrate (1) and hence to the waveguide core (3).

Abstract: An array of SOAs integrated in a semiconductor chip 1 is optically coupled to an array of waveguides 12 arranged on a substrate 10 of a passive device by mounting the semiconductor chip 1 on the substrate 10 to form a hybrid optical assembly. The semiconductor chip 1 is manufactured with a redundant array of SOAs. In a first aspect, the array of SOAs A1, A2, etc are arranged with a pitch equal to the predetermined pitch at which the array of waveguides 12 are arranged on the substrate 11 divided by an integer greater than 1. In a second aspect, the SOA A, B, C are arranged at the same predetermined pitch at which the array of waveguides 12 are arranged, but the number of SOAs A, B, C in the array on the semiconductor chip 1 is greater than the number of waveguides 12 arranged on the substrate 10.

Abstract: A method of aligning the end of an array of optical fibers 27, such as ribbon fiber, with waveguides 33 in an optical device 31, such as an active semiconductor optical device. The ends of the optical fibers 27 are mounted in grooves 25 in a grooved surface 23 of a first block 21 of a fiber block assembly 20. A second block 22 is mounted to the grooved surface 23 of the first block 21 with the fibers 27 mounted between the blocks 21, 22. The grooved surface 23 of the first block 21 extends beyond the second block 22 to form guide surfaces 30. The optical device 31 is supported on a support surface 36 of a bench 32 having guide surfaces 37 extending from the support surface 36.

Abstract: A method of aligning the end of an array of optical fibers 27, such as ribbon fiber, with waveguides 33 in an optical device 31, such as an active semiconductor optical device. The ends of the optical fibers 27 are mounted in grooves 25 in a grooved surface 23 of a first block 21 of a fiber block assembly 20. A second block 22 is mounted to the grooved surface 23 of the first block 21 with the fibers 27 mounted between the blocks 21, 22. The grooved surface 23 of the first block 21 extends beyond the second block 22 to form guide surfaces 30. The optical device 31 is supported on a support surface 36 of a bench 32 having guide surfaces 37 extending from the support surface 36. The ends of the optical fibers are aligned with the waveguides 33 in the optical device 31 by moving the fiber block assembly 20 with the guide surfaces 30 of the first block 21 in contact with the guide surfaces 37 of the bench 32. This allows adjustment of the alignment in the direction in which the fibers 27 extend and laterally.

Abstract: External Cavity Laser An external cavity laser comprising first and second feedback means with an optical gain medium (2) therebetween, one of the feedback means is provided by a grating (4) formed in a silicon waveguide and the other feedback means is provided by a reflective back facet (2B) of the optical gain medium (2). The output wavelength of the laser, at a given temperature, can thus be determined during its manufacture and the laser can be made by mass production techniques. The grating (4) may be thermally isolated to obviate the need for temperature control means (6) to control the temperature of the grating (4). An array of lasers may be provided on a single chip.