Abstract:
A method of fabricating a photonic device comprises the steps of providing a core pattern of waveguide core material (1) on a base layer (3) and applying a cladding layer (2) over the core material 1 and the base layer (3). The height of the surface of the cladding layer (2) over the base layer (3) varies in dependence on the pattern of core material (1). The core pattern is designed with at least two reference regions, each having a width w that is selected to provide a peak of the cladding layer (2) with a predetermined height h1 over each reference region. The core pattern is further designed such that a line between the peaks of the reference regions is higher than any intervening peaks of the cladding layer, whereby the peaks of the reference regions provide a vertical alignment reference.
Abstract:
An optical device comprises a common data input (4) for receiving input data to the device and a local clock input (5) for receiving a local clock signal. The devices includes two optical logic gates Gl, G2 having respective clock inputs respective data inputs. The data inputs of the first and second optical logic gates Gl, G2 are each arranged to receive data from the common data input (4) and the clock inputs of the first and second optical logic gates Gl, G2 are each arranged to receive a clock signal from the local clock input (5). In this way, the output of each optical logic gate Gl, G2 is the input signal retimed to the local clock signal. The device further comprises a third optical logic gate XOR arranged to receive the output of the first and second optical logic gates and to output 3R regenerated data corresponding to the input signal.
Abstract:
A scale calibration method involves the use of a secure computer device with a GPS function to determine gravity strength at the location of installation of a scale (10). The scale (10) itself may include a self-calibration feature that enables the scale to automatically determine an appropriate gravity strength value for an operating location of the scale (10).
Abstract:
A scale calibration method involves the use of a secure computer device with a GPS function to determine gravity strength at the location of installation of a scale (10). The scale (10) itself may include a self-calibration feature that enables the scale to automatically determine an appropriate gravity strength value for an operating location of the scale (10).
Abstract:
An integrated optical device (17) comprises a first optical component (5) formed from a plurality of layers of material and a second optical component (11) formed from a plurality of layers of material. A first optical path (4) is defined in the first optical component (5) and a second optical path (12) is defined in the second optical component (11). The first optical path (4) is coupled to the second optical path (12). The first optical component (5) is arranged relative to the second optical component (11) such that there is a non-zero angle, particularly a right angle, between the layers of the first optical component (5) and the layers of the second optical component (11). The second optical path (12) directs light from the first optical path (4) in a direction substantially normal to the layers of the first optical component (5) or in a direction having at least a component normal to the layers of the first optical component (5). In this way, light can be coupled out of the plane of the first optical component (5) in a relatively simple manner.
Abstract:
A scale calibration method involves the use of a secure computer device with a GPS function to determine gravity strength at the location of installation of a scale. The scale itself may include a self-calibration feature that enables the scale to automatically determine an appropriate gravity strength value for an operating location of the scale.
Abstract:
A method of fabricating a photonic device comprises the steps of providing a core pattern of waveguide core material (1) on a base layer (3) and applying a cladding layer (2) over the core material 1 and the base layer (3). The height of the surface of the cladding layer (2) over the base layer (3) varies in dependence on the pattern of core material (1). The core pattern is designed with at least two reference regions, each having a width w that is selected to provide a peak of the cladding layer (2) with a predetermined height h1 over each reference region. The core pattern is further designed such that a line between the peaks of the reference regions is higher than any intervening peaks of the cladding layer, whereby the peaks of the reference regions provide a vertical alignment reference.