Abstract:
PROBLEM TO BE SOLVED: To provide a SiOB connection device in which the laser beam need not be overhung at the cavity edge, and the reliability can be maintained. SOLUTION: An assembly to optically connect a first optical device 17 to a second optical device 19 comprises a base plate 10 having a cavity 13, and a lens 15 arranged in the cavity 13, the first optical device 17 is provided with a light beam radiator arranged on the base plate 10, the output beam of the light beam radiator is received by the lens 15, the second optical device 19 is arranged so as to receive the light beam converged by the lens 15, and the cavity 13 is asymmetrical in shape.
Abstract:
A subassembly for coupling a laser to an optical fiber (19) comprises a substrate (10) having an asymmetrical, pyramidal cavity (13), a spherical lens (15) located in the cavity, and a semiconductor laser (17) positioned on the substrate. The output face of the laser is located along an edge (14) of the cavity (without overhanging the edge), and its active region (17.1) is aligned with the center (15.1) of the lens along the optic axis (16) of the subassembly.
Abstract:
There is disclosed, an optical subassembly (10) includes a platform (12) on which a laser (18) and photodiode (14) are mounted. The laser (18) has a rear facet (42) through which passes a small portion of the light emitted by the laser (18). The photodiode (14) is mounted on the surface of the platform with a light admitting facet (44) for receiving a portion of the light emitted from the rear facet (42) of the laser being substantially perpendicular to the light emitting facet (42) of the laser. The surface of the platform may include a channel (34). The channel (34) may be tapered from a narrower end (36) near the laser (18) to a wider end (38) near the photodiode (14), and may be coated with a light-reflective material.
Abstract:
There is disclosed, an optical subassembly (10) includes a platform (12) on which a laser (18) and photodiode (14) are mounted. The laser (18) has a rear facet (42) through which passes a small portion of the light emitted by the laser (18). The photodiode (14) is mounted on the surface of the platform with a light admitting facet (44) for receiving a portion of the light emitted from the rear facet (42) of the laser being substantially perpendicular to the light emitting facet (42) of the laser. The surface of the platform may include a channel (34). The channel (34) may be tapered from a narrower end (36) near the laser (18) to a wider end (38) near the photodiode (14), and may be coated with a light-reflective material.
Abstract:
A subassembly for coupling a laser to an optical fiber (19) comprises a substrate (10) having an asymmetrical, pyramidal cavity (13), a spherical lens (15) located in the cavity, and a semiconductor laser (17) positioned on the substrate. The output face of the laser is located along an edge (14) of the cavity (without overhanging the edge), and its active region (17.1) is aligned with the center (15.1) of the lens along the optic axis (16) of the subassembly.
Abstract:
Location-based services are provided in a communication system comprising at least a portion of at least one wireless network. In one aspect of the invention, particular ones of a plurality of mobile user devices associated with a wireless network are identified for which sufficient location-indicative information is available from which a general location of said devices can be inferred without performing actual location measurements for said devices. The delivery of location queries to the identified mobile user devices is prevented, such that a number of location queries required for provision of a given location-based service is reduced relative to a number of location queries which would otherwise be required without the delivery prevention.
Abstract:
Location-based services are provided in a communication system comprising at least a portion of at least one wireless network. In one aspect of the invention, profile information is obtained for users associated with respective mobile user devices, and location information is obtained for the mobile user devices. At least one message is controllably delivered to a given one of the mobile user devices based on the location information and the profile information. The location information is obtained for respective ones of the mobile user devices responsive to location determinations initiated by those devices.
Abstract:
Location-based services are provided in a communication system comprising at least a portion of at least one wireless network. In one aspect of the invention, users associated with respective mobile user devices are separated into at least a first group of users of a first benefit class of a location-based service and a second group of users of a second benefit class of the location-based service. Location information is obtained for the mobile user devices, with the location information being obtained more frequently for the mobile user devices of users in the first group than for the mobile user devices of users in the second group. At least one message is controllably delivered to a given one of the mobile user devices based on the location information.