Abstract: Described is a flexible thermally-drawn receive phased array antenna and antenna system and a process for making the same. The phased array antenna system includes a plurality of antenna elements and one or more low noise amplifiers (LNAs) encapsulated in a fiber such as flexible polyetherimide (PEI) fiber material. A DC bias for the LNAs and other components is provided by one or more electrically conducting wires disposed in proximity to the antenna elements and also encapsulated in the fiber. In embodiments, the antenna elements are provided as dipole antenna elements and the phased array antenna is provided as a flexible thermally-drawn linear dipole receive phased array antenna operable at UHF frequencies.

Abstract: In an ultrastable laser, using a large mode-volume optical resonator, which suppresses the resonator's fast thermal fluctuations, together with the stimulated Brillouin scattering (SBS) optical nonlinearity presents a powerful combination that enables the ability to lase with an ultra-narrow linewidth of 20 Hz. The laser's long-term temperature drift is compensated by using the narrow Brillouin line to sense minute changes in the resonator's temperature (e.g., changes of 85 nK). The precision of this temperature measurement enables the stabilization of resonators against environmental perturbations.

Abstract: The performance of an electro-optic modulator depends in part on the capacitance, the inductance, the electric field distribution, and the signal insertion loss of a microwave transmission line that modulates the refractive index of a waveguide via the electro-optic effect. Conventional electro-optic modulators are typically unable to improve one of these properties without negatively affecting other properties, resulting in lower performance. These shortcomings may be overcome, in part, by the inclusion of capacitive structures to decouple these properties. The capacitive structure may include a fang and/or a hook to tune the capacitance and the electric field distribution without appreciably changing the inductance or the signal insertion losses.

Abstract: In-band full-duplex (IBFD) wireless systems offer the ability to revolutionize frequency spectrum utilization for future networks. For IBFD systems to work, the self-interference (SI) generated by each wireless node should be sufficiently mitigated, which becomes more challenging as the bandwidth increases. RF cancellation enables this interference reduction but has been limited so far to narrowband operation or restricted to distinctive environments. Fortunately, a photonic-enabled RF canceller can provide broadband interference cancellation using photonic components in a wideband vector modulator architecture with tunable time-delay taps. An example of this canceller with 20 canceller taps provides 25 and 20 dB of cancellation over 500-MHz and 1-GHz instantaneous bandwidths, respectively, and is tunable between 0.5 and 5.5 GHz. This photonic-enabled RF canceller provides the wideband operation and high tap counts for successfully deploying future wireless systems with IBFD technology.

Abstract: Ultrastable lasers serve as the backbone for advanced scientific experiments and enable atomic spectroscopy and laser interferometry at high levels of precision. But is not clear how to realize an ultrastable laser that is compact and portable for field use. An ultrastable laser source should be insensitive to both short- and long-term fluctuations in temperature, which ultimately broaden the laser linewidth and cause drift in the laser's center frequency. Fortunately, using a large mode-volume optical resonator, which suppresses the resonator's fast thermal fluctuations, together with the stimulated Brillouin scattering (SBS) optical nonlinearity presents a powerful combination that enables the ability to lase with an ultra-narrow linewidth of 20 Hz. The laser's long-term temperature drift is compensated by using the narrow Brillouin line to sense minute changes in the resonator's temperature (e.g., changes of 85 nK).

Abstract: In-band full-duplex (IBFD) wireless systems offer the ability to revolutionize frequency spectrum utilization for future networks. For IBFD systems to work, the self-interference (SI) generated by each wireless node should be sufficiently mitigated, which becomes more challenging as the bandwidth increases. RF cancellation enables this interference reduction but has been limited so far to narrowband operation or restricted to distinctive environments. Fortunately, a photonic-enabled RF canceller can provide broadband interference cancellation using photonic components in a wideband vector modulator architecture with tunable time-delay taps. An example of this canceller with 20 canceller taps provides 25 and 20 dB of cancellation over 500-MHz and 1-GHz instantaneous bandwidths, respectively, and is tunable between 0.5 and 5.5 GHz. This photonic-enabled RF canceller provides the wideband operation and high tap counts for successfully deploying future wireless systems with IBFD technology.

Abstract: An optoelectronic filter having at least one input and an output includes a modulator circuit having at least first and second inputs with a first one of the modulator circuit inputs adapted to couple to a respective one of the at least one input of the optoelectronic filter. The modulator circuit receives at least a first radio frequency (RF) signal having a first power level and a second RF signal having a second, different power level at the first one of the modulator circuit inputs and in response thereto generates a modulated signal at an output thereof. The first RF signal is suppressed relative to the second RF signal in the modulated signal. The optoelectronic filter additionally includes a light source adapted to couple to a second one of the modulator circuit inputs. A corresponding method is also provided.

Abstract: An optoelectronic filter having at least one input and an output includes a modulator circuit having at least first and second inputs with a first one of the modulator circuit inputs adapted to couple to a respective one of the at least one input of the optoelectronic filter. The modulator circuit receives at least a first radio frequency (RF) signal having a first power level and a second RF signal having a second, different power level at the first one of the modulator circuit inputs and in response thereto generates a modulated signal at an output thereof. The first RF signal is suppressed relative to the second RF signal in the modulated signal. The optoelectronic filter additionally includes a light source adapted to couple to a second one of the modulator circuit inputs. A corresponding method is also provided.

Abstract: An integrated zig-zag transceiver module for multiplexing and demultiplexing several wavelengths achieves a high level of integration by combining several electronic and optical elements into TO headers with lids. A photodetector, a transimpedance amplifier (TIA), a lens, and a thin-film filter are integrated into a single TO can, with the filter and lens being designed for off-axis illumination and focusing. A VCSEL, a lens, and a thin-film filter are integrated into a single TO can, with the filter and lens being designed for off-axis beam steering and collimation.

Abstract: An integrated zig-zag transceiver module for multiplexing and demultiplexing several wavelengths achieves a high level of integration by combining several electronic and optical elements into TO headers with lids. A photodetector, a transimpedance amplifier (TIA), a lens, and a thin-film filter are integrated into a single TO can, with the filter and lens being designed for off-axis illumination and focusing. A VCSEL, a lens, and a thin-film filter are integrated into a single TO can, with the filter and lens being designed for off-axis beam steering and collimation.