Abstract: This application discloses a data writing method, device, a storage server and a computer readable storage medium, including: writing, when a write request is received, write data corresponding to the write request to a write buffer; acquiring historical access data of a data block corresponding to to-be-flushed data in the write buffer when a data flushing operation is triggered for the write buffer; determining whether the to-be-flushed data is write-only data based on the historical access data by using a pre-trained classifier; if yes, writing the to-be-flushed data to a hard disk drive; and if no, writing the to-be-flushed data to a cache. The data writing method provided by this application can effectively reduce the traffic of writing dirty data to the cache while reserving more space in the cache for the ordinary data, thereby improving the utilization of the cache space and the read hit rate of the cache.

Abstract: A proposed fabrication technique for a polarization-absorbing wire grid polarizer avoids the need to etch through the multilayer stack of materials to form the grid structure. Initial reflective metal and dielectric buffer layers are patterned and etched in a conventional manner to create the desired grid topology. A small-angle coating process is then used to complete the fabrication process by first coating the top surface of the patterned dielectric with a polarization-absorbing metal. A second coating process is used to cover the created metal coating with a dielectric cladding material. Maintaining a small angle of incidence between the coating source and the wire grid structure ensures that top portions of the grid are suitably covered to create the desired multilayer wire configuration.

Abstract: Improved dither detection, measurement, and voltage bias adjustments for an electro-optical modulator are described. The electro-optical modulator generally includes RF electrodes and phase heaters interfaced with semi-conductor waveguides on the arms of Mach-Zehnder interferometers, where a processor is connected to output a bias tuning voltage to the electro-optical modulator for controlling optical modulation. A variable gain amplifier (VGA) can be configured with AC coupling connected to receive a signal from a transimpediance amplifier (TIA) that is configured to amply a photodetector signal from an optical tap that is used to measure an optical signal with a dither signal. The analog to digital converter (ADC) can be connected to receive output from the VGA. The processor can be connected to receive the signal from the ADC and to output the bias tuning voltage based on evaluation of the signal from the tap.

Abstract: A method for authenticating a user in a session initiated on a computing device is disclosed herein.

Abstract: Optical modulators with semiconductor based optical waveguides interacting with an RF waveguide in a traveling wave structure. The semiconductor optical waveguide generally comprise a p-n junction along the waveguide. To reduce the phase walk-off between the optical signal and the RF signal, the traveling wave structure can comprise one or more compensation sections where the phase walk-off is reversed. The compensation sections can comprise a change in dopant concentrations, extra length for the optical waveguide and/or extra length for the RF waveguide. Corresponding methods are described.

Abstract: Improved dither detection, measurement, and voltage bias adjustments for an electro-optical modulator are described. The electro-optical modulator generally includes RF electrodes and phase heaters interfaced with semi-conductor waveguides on the arms of Mach-Zehnder interferometers, where a processor is connected to output a bias tuning voltage to the electro-optical modulator for controlling optical modulation. A variable gain amplifier (VGA) can be configured with AC coupling connected to receive a signal from a transimpediance amplifier (TIA) that is configured to amply a photodetector signal from an optical tap that is used to measure an optical signal with a dither signal. The analog to digital converter (ADC) can be connected to receive output from the VGA. The processor can be connected to receive the signal from the ADC and to output the bias tuning voltage based on evaluation of the signal from the tap.

Abstract: An industrial control system and a method of inspecting one or more communication packets in an industrial control system may be provided, the industrial control system firewall module comprising a packet accessing component configured to access a communication packet of an industrial control system; a firewall rules database, the firewall rules database configured to store one or more firewall rules; an inspection module configured to access the one or more firewall rules based on an industrial protocol associated with the communication packet; and the inspection module is further configured to perform a comprehensive inspection of all header fields and data fields of the communication packet based on the one or more firewall rules accessed based on the industrial protocol associated with the communication packet.

Abstract: A method of establishing a direct wireless communication link between a first device and a second device (the first device being designated as a sender and the second device being designated as a receiver) comprises: a proximity authentication operation that comprises determining, based on signals received by the first and second devices over one or more RF channels from a plurality of wireless access points, that the first device is proximate the second device; following the proximity authentication operation, a key generation operation that comprises: generating a shared secret by performing randomness extraction on respective signals received at the first and second devices over a selected channel of the one or more RF channels; and establishing the direct wireless communication link using the shared secret.

Abstract: Improved dither detection, measurement, and voltage bias adjustments for an electro-optical modulator are described. The electro-optical modulator generally includes RF electrodes and phase heaters interfaced with semi-conductor waveguides on the arms of Mach-Zehnder interferometers, where a processor is connected to output a bias tuning voltage to the electro-optical modulator for controlling optical modulation. A variable gain amplifier (VGA) can be configured with AC coupling connected to receive a signal from a transimpediance amplifier (TIA) that is configured to amply a photodetector signal from an optical tap that is used to measure an optical signal with a dither signal. The analog to digital converter (ADC) can be connected to receive output from the VGA. The processor can be connected to receive the signal from the ADC and to output the bias tuning voltage based on evaluation of the signal from the tap.

Abstract: Filter circuitry is provided for use with a light detection and ranging (Lidar) device implemented using silicon photonics. The filter circuitry includes high-pass filter circuitry to receive a signal from a photodetector of the lidar device and attenuate a lower frequency portion of the signal, where the lower frequency portion of the signal is the result of optical back reflections within the lidar device.

Abstract: Techniques for termination for microring modulators are disclosed. In the illustrative embodiment, a microring modulator on a photonic integrated circuit (PIC) die is modulated by radiofrequency (RF) signals connected to electrodes across the microring modulator. A resistor is connected to each of the electrodes. The resistors both provide termination for the RF signals, preventing or reducing reflections, as well as forming part of a bias tee, allowing for a DC bias voltage to be applied across the electrodes.

Abstract: In one embodiment, an optical transceiver includes: a photonic integrated circuit (PIC) formed on a semiconductor die having a first side and a second side opposite the first side, where the first side includes a first optical circuit and a second optical circuit and the second side is to electrically couple with a substrate. The PIC may further have one or more through silicon vias (TSVs) formed through the semiconductor die to electrically couple the first side with the second side, where at least one of the TSVs is to enable electrical coupling between a first other die adapted to the first side and a second other die. Other embodiments are described and claimed.

Abstract: In an embodiment, an apparatus includes: a modulator to modulate an optical signal with a frequency modulated (FM) signal according to IQ single sideband (SSB) modulation to output a modulated optical signal; an integrated optical transceiver to transmit the modulated optical signal and receive a reflection of the transmitted modulated optical signal; and a bandpass filter coupled to at least one of the modulator or the optical transceiver to filter at least one of the modulated optical signal or the reflection of the transmitted modulated optical signal. Other embodiments are described and claimed.

Abstract: Embodiments described herein may be related to apparatuses, processes, and techniques directed to a multiple traveling waveguide structure to synthesize EO frequency responses used for optical modulation. Multiple traveling waveguide devices may include a plurality of traveling waveguides, each with different characteristics resulting in a different EO response within a target frequency range. These different characteristics may be achieved by varying the PN junction, PN doping level, optical waveguides, RF waveguides and the like for each traveling waveguide. The multiple traveling waveguide structure is formed by combining each traveling waveguide in a serial and/or parallel fashion, and then iteratively optimized based on artificial intelligence (AI) training sequences, to achieve an overall optical modulation beyond 100 GHz. Other embodiments may be described and/or claimed.

Abstract: Embodiments described herein may be related to apparatuses, processes, and techniques directed to phase match and impedance match to enable a higher baud rate for ultra-high-speed TW-MZM for 100 Gbaud or above for PAM applications, and/or 120 Gbaud or above for QAM applications. Embodiments described herein may include ultra-high-speed TW-MZM based on differential signal-to-signal (SS) TW using a push-pull PN structure. These embodiments facilitate high speeds for a TW-MZM due to decreased complexity by eliminating a ground in the TW. Other embodiments may be described and/or claimed.

Abstract: Optical modulators with semiconductor based optical waveguides interacting with an RF waveguide in a traveling wave structure. The semiconductor optical waveguide generally comprise a p-n junction along the waveguide. To reduce the phase walk-off between the optical signal and the RF signal, the traveling wave structure can comprise one or more compensation sections where the phase walk-off is reversed. The compensation sections can comprise a change in dopant concentrations, extra length for the optical waveguide and/or extra length for the RF waveguide. Corresponding methods are described.

Abstract: Optical modulators with semiconductor based optical waveguides interacting with an RF waveguide in a traveling wave structure. The semiconductor optical waveguide generally comprise a p-n junction along the waveguide. To reduce the phase walk-off between the optical signal and the RF signal, the traveling wave structure can comprise one or more compensation sections where the phase walk-off is reversed. The compensation sections can comprise a change in dopant concentrations, extra length for the optical waveguide and/or extra length for the RF waveguide. Corresponding methods are described.

Abstract: An industrial control system firewall module and a method of inspecting one or more communication packets in an industrial control system may be provided, the industrial control system firewall module comprising a packet accessing component configured to access a communication packet of an industrial control system; a firewall rules database, the firewall rules database configured to store one or more firewall rules; an inspection module configured to access the one or more firewall rules based on an industrial protocol associated with the communication packet; and the inspection module is further configured to perform a comprehensive inspection of all header fields and data fields of the communication packet based on the one or more firewall rules accessed based on the industrial protocol associated with the communication packet.

Abstract: Optical modulators with semiconductor based optical waveguides interacting with an RF waveguide in a traveling wave structure. The semiconductor optical waveguide generally comprise a p-n junction along the waveguide. To reduce the phase walk-off between the optical signal and the RF signal, the traveling wave structure can comprise one or more compensation sections where the phase walk-off is reversed. The compensation sections can comprise a change in dopant concentrations, extra length for the optical waveguide and/or extra length for the RF waveguide. Corresponding methods are described.

Abstract: Improved dither detection, measurement, and voltage bias adjustments for an electro-optical modulator are described. The electro-optical modulator generally includes RF electrodes and phase heaters interfaced with semi-conductor waveguides on the arms of Mach-Zehnder interferometers, where a processor is connected to output a bias tuning voltage to the electro-optical modulator for controlling optical modulation. A variable gain amplifier (VGA) can be configured with AC coupling connected to receive a signal from a transimpediance amplifier (TIA) that is configured to amply a photodetector signal from an optical tap that is used to measure an optical signal with a dither signal. The analog to digital converter (ADC) can be connected to receive output from the VGA. The processor can be connected to receive the signal from the ADC and to output the bias tuning voltage based on evaluation of the signal from the tap.