Abstract: An optical transmitter providing the benefits of both filter-locked and wavelength-locked lasers is disclosed by modifying an external cavity (32) for the integration of an optical modulator (14). The external cavity (32) provides a round-trip path for light travel. A substrate (24) is connected to the external cavity (32) where at least one gain element (16) and the optical modulator (14) are integral with the substrate (24). A partial reflector (40) is also integral with the substrate (24) and couples the at least one gain element (16) with the optical modulator (14).

Abstract: A resultant device and a method for making a frame structure for use as a poled optical device (10) includes providing a glass preform (30) having a poling area (12) and a waveguiding core area (16). At least one feedstock (24) is assembled into the waveguiding core area (16). The at least one feedstock (24) is separated from the poling area (12). The glass preform (30) and the at least one feedstock (24) are heated (36) and drawn into a smaller diameter (13) to form an optical waveguide.

Abstract: A coupling for an optical device that disperses wavelengths along a focal line includes reflective surfaces that fold light out of a plane propagation and into alignment with an array of inputs or outputs. Some of the reflective surfaces are offset from the focal line so that the inputs or outputs can be spaced closer together in a dimension along the focal line.

Abstract: One aspect of the present invention is a method of making a semiconductor laser optical waveguide telecommunications module which includes providing a semiconductor laser, a housing, and an oxidizing atmosphere, such that the oxidizing atmosphere is in contact with the semiconductor laser and contained by the housing. In another aspect, the invention includes a semiconductor laser optical waveguide telecommunications module that includes a semiconductor laser, a housing for enclosing the semiconductor laser and an O2-free oxidizing atmosphere in contact with the semiconductor laser and contained by the housing.

Abstract: A method for making an optical attenuating device comprising an optical waveguide having a core doped with a transition metal and a cladding. The transition metal is deposited in the core during a core blankmaking process. The transition metal doped core is exposed to gaseous hydrogen in a furnace to significantly increase the attenuation of the device.

Abstract: An external cavity, single mode laser has a semiconductor gain medium, such as a diode laser, and a monolithic prism assembly positioned in an external resonant cavity having a length of 10 mm or less. The monolithic prism assembly includes a transparent substrate carrying a thin film Fabry-Perot interference filter on a face which is tilted to the path of travel of the laser light in the external cavity. Translation of the monolithic prism assembly including transversely to the optical axis provides continuous mode-hop-free tuning of the laser output wavelength. The Such optical devices can be economically mass produced in advantageously small size, having reproducible spectral performance properties held within tight tolerances. Significantly advantageous applications include dense wavelength division multiplexing systems requiring tightly spaced wavelength subranges for each of multiple channels. High wavelength stability against temperature and humidity changes, etc., can be achieved.

Abstract: A fiber laser system including multiple fiber lasers fabricated to emit at respective different wavelengths when optically pumped by radiation at a pump wavelength. A pump laser emits the pump radiation and pumps one or more of the fiber lasers. The outputs of the fiber lasers are recombined onto a transmission fiber, preferably for use in a wavelength-division multiplexing (WDM) telecommunication system. In one set of embodiments, an optical switch switches the pump radiation to only one of the fiber lasers. A second switch controlled in correspondence to the first switch or a passive combiner, preferably a wavelength-division multiplexer, directs the output of the lasing fiber to an optical output path. In another embodiment, the one pump laser simultaneously pumps all the fiber lasers. One or more pump laser may be placed in parallel, and their outputs are combined. The parallel pump lasers may either be individually activated for redundancy or simultaneously operated for higher power.

Abstract: An interference filter (10, 30, 50, 70, 90, 110, 130, 150, or 190) filters selected wavelengths by dividing an input beam into two or more intermediate beams having different optical path lengths and by recombining the intermediate beams into an output beam that is modified by interference between the intermediate beams. An optical path length difference generator (20, 40, 60, 80, 100, 120, 140, 160, or 200) varies the optical path lengths of the intermediate beams by changing the physical lengths of their paths or the refractive indices of the mediums in which they are conveyed. The optical path length generator (20) of one exemplary embodiment (10) includes a spacer plate (20) that is divided into elements (22 and 24) having different refractive indices for varying the optical path lengths of the intermediate beams.

Abstract: A circuit for controlling the output level of a power amplifier is disclosed. A current comparator (230) compares a reference current with a sensed current which is representative of the power amplifier current state. The reference current is used not only for comparison with the sensed current but also for setting the power amplifier (104). The current comparator (230) provides an output, based on the comparison, that is coupled to the power amplifier so that the power amplifier current is maintained at an optimum level for minimizing temperature dependent variations and substantially leveling the power of the power amplifier.

Abstract: An antenna comprises a feed port, a 1/2 wavelength radiator (20), and a double resonant transformer (10). The feed, port, having a signal feed portion (34) and a ground portion (44), is at a low impedance while the 1/2 wavelength radiator (20) has opposed high impedance ends (21 and 22). For transforming low impedance to high impedance, at two resonant frequencies, the double resonant transformer is coupled between the feed port and the 1/2 wavelength radiator.

Abstract: A splatter control circuit (28) for a noise blanking receiver (10) includes a SAW filter (40) having an output (115) in a main signal path. A noise blanker (27) having a control input (86) and a signal input (128) connectable to the input of the SAW filter, and an output (58), produces at its output signals received when no noise pulses are detected and the blanker switch blanking the SAW output when a noise pulse is detected. A level detector (80) having an input connected to the output of the SAW filter and an output, the level detector producing a signal at its output to stop the blanker from blanking at its control input when the SAW filter passes a signal above a predetermined level.

Abstract: A latch (16) for latching or locking a battery housing (14) to a portable radio housing (12) automatically locks into place when it is placed in the radio, and automatically ejects the battery housing when it is unlocked. The latch is movable from a first position, in which the battery housing is locked to the portable radio, to a second position, in which the battery housing is unlocked from the radio, and movable from the second position to the first position. The latch comprises a spring biasing apparatus (18) for attaching the latch to the housing, retainer apparatus (22) for locking the battery housing to the radio, and a spring finger member (20) for ejecting the battery housing from the radio housing when the latch is moved from the first to the second position.

Abstract: A CT-2 base's intelligence (36) is enhanced by having a handset (12) transmit (418) its base registration history to the base station (24) such that the base can determine (724) whether the handset is correctly registered. The handset (12) requests (606) a link with any one of the previously registered base stations recorded in the base registration history by transmitting a link request containing the handset ID and any one of the previously recorded base IDs from the base registration history. This single base ID need not necessarily be the base station identification of the currently registered base station. The base station then determines (724) whether the one base station identification matches one member of the base registration history for the associated handset identification. In response to a match, the base transmits (712) the link grant to the handset.

Abstract: A resilient latch (70) and a method of attaching the latch to a pair of interlocked housings (50) having a recessed border and mating cavities (377) in the recessed border. Placed around the border of the paired housings, the latch having protrusions (727) engages with the cavities of the paired housings, as the latch is slid around the border.

Abstract: A radio frequency electrical connection between a pair of electrical devices (101, 104) is formed by a pair of bond wires (102, 103) crossing (401) each other.

Abstract: A voltage monitoring method and apparatus starts with the operation of a normal microcomputer program flow, in a microcomputer (40). An input voltage source (90) is converted to a current digital output word (581) representative of the instantaneous amplitudes of the input voltage source (90). A threshold condition (562) is set ahead of time. When the current digital output word (581) satisfies the threshold condition (582), an interrupt signal (36) is generated. Finally, the normal microcomputer program flow is interrupted in response to the interrupt signal (36).

Abstract: A converter console (10) includes a base (36) having a hinge axis (127) at a rearward end and a vertical extension (311) having a base mounting joint (29) at the tip of the extension at a front end. A radio receiving pocket (25) has a handle mounting joint (411) at a first end and a hook (27) at a second end, corresponding to the ends of the base for pivotally mounting the hook around the hinge axis. A collapsible linkage (15) couples the pocket (25) to the base (36) between the base mounting joint (29) and the handle mounting joint (411) for pivotally raising and lowering the pocket and for clamping the pocket down.

Abstract: A twisted-pair conductor line structure is formed on a substrate (22) having insulated conductive layers (10, 11). The conductive layers are used to form first, second, third, and fourth conductive planar segments (16). A first conductive link (44) joins the first and second planar conductive segments to provide a first signal path. Similarly, a second conductive link (46) joins the third and fourth planar conductive segments to provide a second signal path. The first and second conductive links are operatively arranged to form a twist (17) in the first and second signal paths, such that the resulting magnetic fields (57, 59) around the twisted conductive segments will be opposite to each other for cancelling each other out, in order to reduce the magnetic field radiation to the surrounding environment. Two such twisted-pair conductor lines are placed such that their twisted portions are off-set from each other.

Abstract: A self-retaining knob assembly (200) includes a housing (150) and a hub (120). The housing (150) has a cavity(157) for receiving a key (135) and a rotation track (160) about the cavity (157). The hub (120) has an integral key (135) and is rotatably mounted within the cavity (157) and within the rotation track (160). While being mounted, the key (135) is guided into the rotation track (160) by a guide member (266) integrally located on the housing (150). The housing (150) has retaining members (261,262) which cooperate with the key (135) to substantially restrict the removal of the key (135) from within the cavity (157) after the key (135) is mounted.

Abstract: A parallel processing system (10) is provided to logically divide (68) a task into subtasks that can be performed simultaneously by a plurality of computers (1-4) loosely coupled in parallel via a loosely coupled interconnection (11). A file server (9) is connected to the loosely coupled interconnection (11) for sharing memory among the plurality of computers (1-4). For coordinating the cooperation of the plurality of computers (104) performing these subtasks, a controlling methodology (38) is taught.