Abstract: Embodiments relate generally to a gas detector system. The gas detector system comprises a gas detector mounting flange, where the gas detector mounting flange comprises an explosion-proof cylindrical body that is configured to couple the gas detector mounting flange to a gas detector and a plurality of bolt receiving slots configured to couple the gas detector mounting flange to a mounting system by securing bolts, where each bolt receiving slot is at least three times as long as a diameter of securing bolts.

Abstract: Systems, methods, architectures, mechanisms or apparatus for receiving and storing electromagnetic pulses using photonics includes a transmission unit transmitting electromagnetic pulses; an antenna receiving electromagnetic pulses reflected from a target; an optical recirculation loop for storing replica received electromagnetic pulses; and a processor for extracting target related phase information from the replica received electromagnetic pulses.

Abstract: A method and system comprising: an optoelectronic oscillator comprising a light generator, a modulator, and at least one optical fiber, the optoelectronic oscillator operating to send a modulated carrier signal through the optical fiber into a target area and receive the return signal; a circuit for removal of the carrier frequency operatively connected to the oscillator comprising at least one phase shifter; at least one mixer operatively connected to the at least one phase shifter; at least control circuit operatively connected the at least one mixer and the at least one phase shifter for controlling the phase shifter and operating to cancel signals other than the sideband signals; a signal processor for processing the sideband signals to detect acoustical and/or vibrational signals from the target area. The method comprises sensing vibrational and/or acoustical signals for detection of acoustical and/or vibrational signals in the target area.

Abstract: An architecture for an optoelectronic oscillator uses Stimulated Brillouin Scattering (SBS) to seed, filter and amplify the oscillation signal in an overlapped oscillator loop for both a RF modulated optical sideband and a SBS signal. By phase matching the RF modulated optical sideband generated by SBS with the SBS signal, the feedback will collapse the bandwidth of the SBS signal and in turn the bandwidth of the Brillouin frequency signal, which also serves as a filter to filter out multiple undesired OEO loop modes. The embodiments herein result in reduced phase noise and increased stability.

Abstract: Disclosed is a method for dynamically updating an interface of an application. The method includes: when an application is enabled, a terminal obtaining interface configuration information of the application in local and interface configuration information of the application on a server end; determining whether the interface of the application needs to be updated according to the obtained interface configuration information of the application in the local and interface configuration information of the application on the server end; when determining that the interface of the application needs to be updated, using the interface configuration information of the application on the server end to update the interface configuration information of the application in the local of the terminal, and drawing the interface of the application according to the updated interface configuration information. Also disclosed are a terminal, a dynamic updating system and a computer readable storage medium.

Abstract: A system and method for establishing secure communication between a first device and a second device, wherein the first device is behind a firewall. A Secure Shell (SSH) connection is established between the first device and the second device, wherein establishing a connection includes establishing a secured communications tunnel from the first device to the second device via an SSH protocol. The first device is registered with the second device, wherein registering includes sending an SSH protocol REGISTER DEVICE message from the first device to the second device.

Abstract: An apparatus for generating a frequency spectrum of an RF signal comprising a gate switch for generating a series of pulses from a laser of wavelength lambda modulated by an input RF signal, a first fiber optical loop for circulating a first percentage of a first pulse of the series of pulses from the gate switch, for a predetermined number of cycles n where each cycle takes time t1, a second fiber optical loop for conducting a second percentage of the first pulse for predetermined number of cycles “k”, where each cycle takes time t2, where t2*k=t1*n, a first switch with a first state for coupling the first pulse from the gate switch to a coupler, the coupler coupling the first pulse into the first fiber optical loop and tapping replicas of the pulse from the first fiber optical loop, and a second state for coupling the second percentage of the first pulse to the coupler to increase intensity of the tapped replica pulses, a processor for correlating the replicas of the pulse with each other to produce a set o

Abstract: A system and method for establishing secure communication between a first device and a second device, wherein the first device is behind a firewall. A Secure Shell (SSH) connection is established between the first device and the second device, wherein establishing a connection includes establishing a secured communications tunnel from the first device to the second device via an SSH protocol. The first device is registered with the second device, wherein registering includes sending an SSH protocol REGISTER DEVICE message from the first device to the second device.

Abstract: A method and apparatus for providing RF-photonic filtering link. Specifically, one embodiment is an apparatus comprising a radio frequency (RF)-photonic filter for filtering an RF signal, where the RF-photonic filter comprises a loop comprising an electro-optical modulator, an optical fiber, a photo detector. Another embodiment is a method of operating an RF-photonic filter comprising applying a reference signal to the RF-photonic filter; selecting a reference frequency for the RF-photonic filter upon the RF-photonic filter locking to the reference frequency, disconnecting the reference signal; and applying an RF input signal to the RF-photonic filter to lock the RF input signal to the RF-photonic filter.

Abstract: An apparatus comprising a fiber optical loop for conducting a first and a second pulse having a corresponding first and second wavelength, a first splitter for separating the first and second light pulses in the optical loop into a first and second light path to introduce a predetermined time delay between the first and second light pulses, a coupler for tapping a replica of the pair of light pulses from the loop, an auto-correlation module, coupled to the coupler, for correlating the replica of the pair of light pulses with each other to produce a set of data points comprising a plurality of multiplied and correlated pair of pulses and a transform module, coupled to the auto-correlation module, for transforming the data points into a channelized frequency spectrum.

Abstract: An electro optical scanning phased array antenna having a laser which generates a pulsed output. A microwave source has an output which amplitude modulates the optical output from the laser through an optical modulator. An optical loop circuit has an input connected to an output from the optical modulator and a variable time delay element. The optical loop circuit generates a plurality of modulated optical pulses at equidistantly spaced time intervals from each other at an output from the loop circuit. These time intervals vary as a function of the variable time delay element and a control circuit controls the time delay attributable to the variable time delay element. An antenna array includes end elements while a circuit converts the optical output pulses from the optical loop circuit to radio frequency signals electrically connected to the elements of the antenna array.

Abstract: A method and system comprising: an optoelectronic oscillator comprising a light generator, a modulator, and at least one optical fiber, the optoelectronic oscillator operating to send a modulated carrier signal through the optical fiber into a target area and receive the return signal; a circuit for removal of the carrier frequency operatively connected to the oscillator comprising at least one phase shifter; at least one mixer operatively connected to the at least one phase shifter; at least control circuit operatively connected the at least one mixer and the at least one phase shifter for controlling the phase shifter and operating to cancel signals other than the sideband signals; a signal processor for processing the sideband signals to detect acoustical and/or vibrational signals from the target area. The method comprises sensing vibrational and/or acoustical signals for detection of acoustical and/or vibrational signals in the target area.

Abstract: An apparatus comprising a fiber optical loop for conducting a first and a second pulse having a corresponding first and second wavelength, a first splitter for separating the first and second light pulses in the optical loop into a first and second light path to introduce a predetermined time delay between the first and second light pulses, a coupler for tapping a replica of the pair of light pulses from the loop, an auto-correlation module, coupled to the coupler, for correlating the replica of the pair of light pulses with each other to produce a set of data points comprising a plurality of multiplied and correlated pair of pulses and a transform module, coupled to the auto-correlation module, for transforming the data points into a channelized frequency spectrum.

Abstract: The present invention relates to communications technologies and discloses a data management method and apparatus, so as to solve a problem of customer churn for an operator caused by existing data management. The technical solutions provided in the embodiments of the present invention include: acquiring an operator identification code of a terminal and a preset terminal identification code, where the terminal identification code is not rewritable and uniquely corresponds to the terminal; performing a hash operation on first data by using a preset hash algorithm to obtain a first hash value; detecting whether a signature is consistent with the first hash value to obtain a detection result; and determining whether the terminal has permission to be used according to the detection result. The embodiments of the present invention can be applied to a mobile terminal such as a mobile phone.

Abstract: An apparatus for generating a frequency spectrum of an RF signal comprising a gate switch for generating a series of pulses from a laser of wavelength lambda modulated by an input RE signal, a first fiber optical loop for circulating a first percentage of a first pulse of the series of pulses from the gate switch, for a predetermined number of cycles n where each cycle takes time t1, a second fiber optical loop for conducting a second percentage of the first pulse for predetermined number of cycles “k”, where each cycle takes time t2, where t2*k=t1*n, a first switch with a first state for coupling the first pulse from the gate switch to a coupler, the coupler coupling the first pulse into the first fiber optical loop and tapping replicas of the pulse from the first fiber optical loop, and a second state for coupling the second percentage of the first pulse to the coupler to increase intensity of the tapped replica pulses, a processor for correlating the replicas of the pulse with each other to produce a set o

Abstract: An apparatus comprising a dispersive fiber optical loop for delaying a first and second sideband, relative to each other, of a light modulated by a radio frequency signal to create a pair of pulses, a coupler for tapping a replica of the pair of pulses from the loop; and an auto-correlation module, coupled to the coupler, for correlating the replica of the pair of pulses with each other.

Abstract: An apparatus comprising a dispersive fiber optical loop for delaying a first and second sideband, relative to each other, of a light modulated by a radio frequency signal to create a pair of pulses, a coupler for tapping a replica of the pair of pulses from the loop; and an auto-correlation module, coupled to the coupler, for correlating the replica of the pair of pulses with each other.

Abstract: A semiconductor hollow-core waveguide using high-contrast gratings or photonic crystal claddings and a method of manufacturing the same includes providing a layered semiconductor structure; creating an etching mask pattern over the layered semiconductor structure; performing a combined cycled directional etching process on the layered semiconductor structure in one sequence and in one lithography level to create a 3-dimensional waveguide structure; and creating a hollow air core in the layered semiconductor structure by removing to define a shape of the waveguide. The etching process comprises vertically etching a series of deep trenches on the layered semiconductor structure with precise control and varying the width of the trench. Furthermore, the hollow air core is created by removing a portion of the sacrificial material located in the center of the waveguide and under the waveguide.