Abstract: An apparatus may include an energy rate limiter, an electro-optical transmitter, and an energy monitor. The energy rate limiter limits energy transfer, based on an energy control signal, from a power supply to the energy storage module. The energy storage module is charged based on the energy transfer from the power supply. The electro-optical transmitter includes lasers coupled to local energy storage module. Laser firings of the lasers are based on an electrical potential of the energy storage module and laser enable signals corresponding to the lasers. The energy monitor is coupled to the energy storage module and triggers a safety alarm signal if a voltage provided by the energy storage module violates a safety condition related to a threshold voltage. The energy rate limiter terminates the energy transfer from the power supply to the local energy storage module after the safety condition is violated.

Abstract: A communications enabled respirator assembly for amplifying and transmitting vocalizations of a user includes a panel, which cup shaped, substantially rigid, and can filter particulates from air passing through the panel. A coupler engaged to the panel engages the panel to a head of a user. The panel is positioned over a nose and a mouth of the user, positioning the coupler to engage the head of the user to sealably engage the panel to a face of the user. The panel is positioned to filter particulates from air passing through the panel. A communications module engaged to the panel can perform one or more of amplifying and transmitting vocalizations of the user. The communications module thus enhances vocalizations of the user.

Abstract: An apparatus may include an energy rate limiter, an electro-optical transmitter, and an energy monitor. The energy rate limiter limits energy transfer, based on an energy control signal, from a power supply to the energy storage module. The energy storage module is charged based on the energy transfer from the power supply. The electro-optical transmitter includes lasers coupled to local energy storage module. Laser firings of the lasers are based on an electrical potential of the energy storage module and laser enable signals corresponding to the lasers. The energy monitor is coupled to the energy storage module and triggers a safety alarm signal if a voltage provided by the energy storage module violates a safety condition related to a threshold voltage. The energy rate limiter terminates the energy transfer from the power supply to the local energy storage module after the safety condition is violated.

Abstract: A transmitter module is disclosed, where the transmitter module includes optical sources, an optical multiplexer to multiple optical signals each output from optical sources, an optical detector to detect an output of the optical multiplexer, and a controller. The controller alternately superposes a dither signal on a bias current provided to the optical source, and the bias current is controlled based on a magnitude of the dither signal, which is detected by a configuration similar to the lock-in amplifier.

Abstract: A transmitter module is disclosed, where the transmitter module includes optical sources, an optical multiplexer to multiple optical signals each output from optical sources, an optical detector to detect an output of the optical multiplexer, and a controller. The controller alternately superposes a dither signal on a bias current provided to the optical source, and the bias current is controlled based on a magnitude of the dither signal, which is detected by a configuration similar to the lock-in amplifier.

Abstract: A wavelength monitor monolithically integrated with a tunable LD is disclosed. The wavelength monitor includes at least two filters, each filter having a different periodic transmission spectrum. A transmittance of the first filter, and another transmittance of the second filter at a grid wavelength attributed to a WDM system forms a combination which is specific to the grid wavelength but different from other combinations at other grid wavelengths.

Abstract: An optical transceiver of one embodiment includes a transmitter optical subassembly to transmit an optical signal, a receiver optical subassembly to receive an optical signal, a mother board, a daughter board, and a housing. The mother board mounts electronic circuits that electrically communicate with the optical transmitter optical subassembly and the receiver optical subassembly. The daughter board mounts other electronic circuits that electrically communicate with the optical transmitter optical subassembly and the receiver optical subassembly. The daughter board has an extra area mounting a portion of the other electronic circuits. The housing defines a space for installing the optical transmitter optical subassembly, the receiver optical subassembly, the mother board, and the daughter board. The extra area is disposed outside the space.

Abstract: A diaphragm metering pump includes a pump body having a head portion including a suction side and a discharge side defining a flow path. A valve seat is arranged at one of the suction side and the discharge side, and a check valve is arranged at the valve seat. A degassing system includes a check valve actuator operatively connected to the check valve. The check valve actuator is selectively activated to unseat the check valve from the valve seat to allow gases trapped in the head portion to pass through the discharge side.

Abstract: A wavelength monitor monolithically integrated with a tunable LD is disclosed. The wavelength monitor includes at least two filters, each having a periodic transmission sptectrum but a period between nearest neighbor periods is different from the other. A transmittance of the first filter and another transmittance of the second filter at a grid wavelength attributed to the WDM system forms a combination which is specific to the grid wavelength bur different from other combinations at other grid wavelengths.

Abstract: An optical transceiver of one embodiment includes a transmitter optical subassembly to transmit an optical signal, a receiver optical subassembly to receive an optical signal, a mother board, a daughter board, and a housing. The mother board mounts electronic circuits that electrically communicate with the optical transmitter optical subassembly and the receiver optical subassembly. The daughter board mounts other electronic circuits that electrically communicate with the optical transmitter optical subassembly and the receiver optical subassembly. The daughter board has an extra area mounting a portion of the other electronic circuits. The housing defines a space for installing the optical transmitter optical subassembly, the receiver optical subassembly, the mother board, and the daughter board. The extra area is disposed outside the space.

Abstract: A wavelength monitor monolithically integrated with a tunable LD is disclosed. The wavelength monitor includes at least two filters, each having a periodic transmission spectrum but a period between nearest neighbor periods is different from the other. A transmittance of the first filter and another transmittance of the second filter at a grid wavelength attributed to the WDM system forms a combination which is specific to the grid wavelength bur different from other combinations at other grid wavelengths.

Abstract: An optical transceiver implemented with a tunable LD is disclosed. The tunable LD is installed within a TOSA (Transmitter Optical Subassembly). The optical transceiver provides two circuit boards arranged in the up-and-down relation. The TOSA is primarily connected to the second board but signals to drive the tunable LD are carried on an FPC board directly connected to the first board that mounts a driver circuit for the tunable LD.

Abstract: An optical transmitter subassembly of one embodiment includes a temperature controller, first to third bases, a laser diode, and an optical system. The temperature controller includes first and second plates, and temperature controlling elements put between the first and second plates. The first base has first and second regions, and is supported by the first plate. The second base is mounted on the first region. The third base is mounted on the second region. The laser diode is a tunable laser diode integrated with a Mach-Zehnder type optical modulator, and is mounted on the second base. The optical system is capable of fixing a wavelength of the laser diode and is mounted on the third base. Only a portion of the first base is mounted on the first plate. The portion of the first base includes the first region.

Abstract: An optical transceiver implemented with a tunable LD is disclosed. The tunable LD is installed within a TOSA (Transmitter Optical Subassembly). The optical transceiver provides two circuit boards arranged in the up-and-down relation. The TOSA is primarily connected to the second board but signals to drive the tunable LD are carried on an FPC board directly connected to the first board that mounts a driver circuit for the tunable LD.

Abstract: An optoelectronic module includes a housing defining first and second elongated generally parallel, adjacent openings, with each opening designed to receive in nesting engagement either an optical transmitter package or an optical receiver package. Each of the first and second openings has optoelectronic circuitry therein for receiving mating optoelectronic circuitry mounted on received optoelectronic packages. A guide is mounted adjacent to each of the first and second openings and defines an upper and a lower channel. The upper and lower channels are constructed and positioned to slideably receive therein a ferrule formed on the received optoelectronic packages.

Abstract: A mounting structure is disclosed for mounting optical devices in optical alignment with optical systems. A mounting comb includes a base and a plurality of spaced apart fingers extending from the base perpendicular to and opposite a mounting surface. The mounting surface of the mounting comb is fixedly attached to the surface of a substrate with the fingers extending outwardly from the substrate. A receiving comb includes a base with a mounting surface and a plurality of spaced apart fingers extending from the base perpendicular to and opposite the mounting surface. The optoelectronic device is fixedly mounted on the mounting surface of the receiving comb. The fingers of the receiving comb and the mounting comb are fixed in an interdigitated orientation by a layer of adhesive so that an I/O light port of the optoelectronic device is optically aligned with an I/O light port of the optical system.

Abstract: A laser and a monitor photodiode providing a monitor signal. Laser driver circuitry has a data input terminal, a laser bias output terminal, a laser modulation output terminal, and a bias control input terminal. A processor having a bias control output terminal coupled to the bias control input terminal through an adjustable resistance for controlling the monitor signal from the photodiode, a modulation control output terminal coupled to a modulation setting input terminal through an adjustable resistance for controlling amplitude of modulation of the laser, and a modulation crossing point control output terminal coupled to a power adjustment input terminal of the laser driver circuitry through an adjustable resistance for adjusting modulation of the laser to achieve a desired crossing point in the optical output.

Abstract: An optical transceiver module is disclosed with improved digital diagnostic integrated circuits. The optical transceiver includes an electrical-to-optical transmitter and an optical-to-electrical receiver each coupled to a digital diagnostic integrated circuit. A bi-directional 2-wire control interface is provided and a microcontroller couples the digital diagnostic integrated circuit to the control interface. Various methods are described for using the microcontroller to incorporate changes or diagnostic functions in the digital diagnostic integrated circuit.