Abstract: A system may include a laser source, an acousto-optic modulator (AOM) coupled to the laser source, an atom trap, and at least one optical medium coupled between the AOM and the atom trap. Furthermore, at least one piezoelectric transducer may be coupled to the at least one optical medium, and a beam polarization controller may be coupled to the at least one piezoelectric transducer.

Abstract: A quantum communications system includes a communications system that operates with a quantum key distribution (QKD) system, which includes a transmitter node, a receiver node, and a quantum communications channel coupling the transmitter node and receiver node. The transmitter node may be configured to transmit to the receiver node a bit stream of optical pulses, and switch between first and second QKD protocols based upon at least one channel condition.

Abstract: An electronic assembly includes a chassis having electronic module mounting positions. The electronic assembly also includes a respective electronic module received in each electronic module mounting position and having a module cooling gas passageway. Each electronic module has a module glide surface. The electronic assembly includes a respective sealing retainer coupled between the chassis and each electronic module. The sealing retainer has a cooling gas passageway aligned with a chassis cooling gas passageway and the module cooling gas passageway. The sealing retainer includes a retainer body having a retainer glide surface, and a gas sealing gasket carried by the retainer body. The module glide surface and the retainer glide surface have respective cooperating features so that the respective electronic module is maintained in spaced relation from the sealing gasket as the respective electronic module is slidably inserted into a seated position.

Abstract: Systems and methods. The methods comprise: causing bellows to transition from expanded states to collapsed states by removing a first fluid therefrom (the bellows being coupled to opposing sidewalls of a chassis configured to structurally support at least one circuit card); receiving the at least one circuit card in a cavity of the chassis; causing the bellows to transition from the collapsed states to at least partially expanded states by allowing the first fluid to enter the bellows; applying a pushing force by each said bellow to an intermediary structure disposed between the bellow and the circuit card; and creating a seal between the intermediary structure and the circuit card when the bellow is in the at least partially expanded state.

Abstract: A communications system may include end-user devices (EUDs), a communications network, and a message processor. A message parser determines, from a received message, a message originator EUD having an associated originator message channel format, and at least one intended message recipient EUD with an associated recipient message channel format. A message channel database includes respective different message channel formats for different EUDs. A message recaster cooperates with the message parser and message channel database and transmits at least one recast message based upon the received message, which may include a corresponding recipient message channel format with a corresponding Internet Protocol (IP) address for the at least one intended recipient EUD.

Abstract: An electronic assembly may include a chassis having electronic module mounting positions, each having a chassis cooling gas passageway and an electronic module received in each electronic module mounting position. A sealing retainer may be coupled between the chassis and each electronic module, and includes a cooling gas passageway aligned with the chassis cooling gas passageway and a module cooling gas passageway of a respective electronic module. The sealing retainer may include a retainer body, and a gas seal body coupled to the retainer body and movable between retracted and extended positions. The gas seal body in the retracted position permits insertion and removal of the electronic module, and in the extended position seals against the electronic module.

Abstract: Systems and methods for making an interconnect device for electronic circuits. The methods comprise: fabricating a housing as a single 3D printed part having a plurality of apertures with bend angles less than ninety degrees; inserting wires into the plurality of apertures of the housing; and establishing electrical connections respectively between (A) the wires and a plurality of first socket adaptors and (B) the wires and a plurality of second socket adaptors.

Abstract: The optical system includes a base having a groove and an adjacent slot therein. The system also includes at least one optical cell slidably alignable along the groove, and at least one clamp comprising a lower end and an upper end. The lower end is slidably alignable along the slot and is secured at a set location so that the upper end secures the at least one optical cell along the groove. The slot may extend parallel to the groove. The clamp may include at least one preloaded fastener arrangement securing the lower end of the clamp to the base. The preloaded fastener may include a bolt, a spring biasing the bolt, and a threaded backing plate within the slot and receiving the bolt.

Abstract: A sensor receiver may include a Rydberg cell configured to be exposed to a radio frequency (RF) signal, and a probe source configured to generate a plurality of spaced apart pulsed probe beams within the Rydberg cell. The pulsed probe beams may be offset in time from one another. A plurality of excitation sources may be coupled to the Rydberg cell. A detector may be positioned downstream from the Rydberg cell.

Abstract: A geospatial modeling system may include a memory and a processor cooperating therewith to: (a) generate a three-dimensional (3D) geospatial model including geospatial voxels based upon a plurality of geospatial images; (b) select an isolated geospatial image from among the plurality of geospatial images; (c) determine a reference geospatial image from the 3D geospatial model using Artificial Intelligence (AI) and based upon the isolated geospatial image; (d) align the isolated geospatial image and the reference geospatial image to generate a predictively registered image; (e) update the 3D geospatial model based upon the predictively registered image; and (f) iteratively repeat (b)-(e) for successive isolated geospatial images.

Abstract: An optical telescope may include an array of optical lenslets in a common plane, and optical waveguides extending from respective optical lenslets and each having a common optical path delay. Further, at least one optical star coupler may be downstream from the optical waveguides, and an optical detector may be downstream from the at least one optical star coupler and having an optical image formed thereon.

Abstract: An optical switch has latched switch states and includes optical fibers that are laterally joined together to define an optical switching portion. At least one phase change material (PCM) layer is on the optical switching portion so that a phase of the PCM layer determines a latched switch state from among the latched switch states.

Abstract: Systems and methods for operating a communication device. The methods comprise: receiving a signal at the communication device; performing, by the communication device, one or more machine learning algorithms using at least one feature of the signal as an input to generate a plurality of scores (each score representing a likelihood that the signal was modulated using a given modulation type of a plurality of different modulation types); assigning a modulation class to the signal based on the plurality of scores; determining whether a given wireless channel is available based at least on the modulation class assigned to the signal; and selectively using the given wireless channel for communicating signals based on results of the determining.

Abstract: An interference cancellation system may include a radio frequency (RF) transmitter configured to generate an RF interference signal, and an RF receiver configured to receive an RF input signal that includes a signal of interest component and an RF interference signal component from the RF transmitter. The system may also include an electro-optical (EO) modulator configured to apply an interference cancellation phase shift to the RF interference signal, an optical-to-electrical (OE) converter, and an optical path between the EO modulator and OE converter. The system may also include an RF dispersive delay filter connected to the OE converter, and an RF coupler connected to the RF dispersive delay filter and the RF receiver to subtract the RF interference signal component from the RF input signal thereby producing the signal of interest component.

Abstract: An underwater device may include a waterproof housing defining a dry cavity and having a nonferrous switch interface wall. The underwater device may include a rotary switch within the dry cavity and including a switch body, and a switch shaft extending outwardly from the switch body. The underwater device may include a first magnetic body within the dry cavity and coupled between the switch shaft and the nonferrous switch interface wall, and a second magnetic body external from the waterproof housing and adjacent the nonferrous switch interface wall in alignment with the first magnetic body so that rotation of the second magnetic body rotates the switch shaft. Each of the first magnetic body and the second magnetic body may include a permanent magnet.

Abstract: A method for making a radiation shield includes generating a three-dimensional (3D) model for a metal body to serve as a radiation shield based upon a predetermined radiation stopping thickness for the metal and a predetermined strength based upon the metal and a pattern of voids therein. The method includes performing fused filament deposition to create the metal body having the pattern of voids therein.

Abstract: An optical assembly may include a base having a body defining a base mating feature surface. Optical modules are arranged in side-by-side relation on the base and in optical communication with each other. Each optical module includes a housing that is commonly-shaped with other housings. Each housing has a bottom wall defining a module mating feature surface coupled with a respective area of the base mating feature surface and at least one sidewall with an optical communication opening aligned with the at least one optical communication opening of an adjacent housing. A respective optical device is within each housing.

Abstract: A system may include a memory and a processor cooperating therewith to obtain geospatially registered first and second interferometric synthetic aperture radar (IFSAR) images of a geographic area having respective first and second actual grazing angles with a difference therebetween, and convert the first IFSAR image to a modified first IFSAR image having a modified first grazing angle based upon known terrain elevation data for the geographic area. The modified first grazing angle may be closer to the second actual grazing angle than the first actual grazing angle. The processor may further recover updated terrain elevation data for the geographic area based upon the modified first IFSAR image and the second IFSAR image.

Abstract: Systems and methods for applying solder to a pin. The methods comprising: disposing a given amount of solder on a non-wettable surface of a planar substrate; aligning the pin with the solder disposed on the non-wettable surface of the planar substrate; inserting the pin in the solder; and/or performing a reflow process to cause the solder to transfer from the planar substrate to the pin.

Abstract: An environmental emission monitoring system may include satellites configured to sense GHG emissions data for an AOI, and a server. The server may be configured to obtain the sensed GHG emissions data from the satellites, obtain geospatial positions of stationary GHG emitting point sources within the AOI, and generate expected stationary GHG emission data for the stationary GHG emitting point sources within the AOI and based upon the geospatial positions. The server may also be configured to obtain geospatial path data for GHG emitting vehicles moving within the AOI, generate expected vehicle GHG emission data for the GHG emitting vehicles moving within the AOI and based on the geospatial path data, and compare a sum of the expected stationary GHG emission data and expected vehicle GHG emission data with the sensed GHG emissions data to identify any stationary GHG emitting point source and any GHG emitting vehicle outside of a respective GHG emission threshold.