Abstract: In some embodiments, a system for quantum key distribution, includes a plurality of n devices pairwise connected by an optical network, where n is an integer greater than or equal to 2. The optical network comprises a set of n(n?1) channels. The system employs wavelength-multiplexing, wavelength-demultiplexing, and time-multiplexing to provide a secure quantum key between two devices.

Abstract: Systems and methods for soliton microcomb-based precision dimensional metrology via spectrally-resolved interferometry are described. In an embodiment, the system includes a dual-pumped soliton microcomb generator comprising a pump, a microresonator, and an auxiliary pump and that generates a single-soliton microcomb, an erbium-doped fiber amplifier that amplifies a C-band section of the soliton microcomb and a non-polarizing beam splitter that divides the soliton microcomb pulses into a reference arm pulse and a measurement arm pulse for an interferometer and recombines the reference arm pulse and the measurement arm pulse into a recombined beam upon their return.

Abstract: Systems and methods for performing optical coherence tomography (OCT) on a target using microcomb lasers in accordance with embodiments of the invention are illustrated. One embodiment includes an OCT system that includes a laser generator configured to generate a laser beam, and an optical amplifier configured to amplify the laser beam, a microresonator configured to receive the amplified laser beam and couple the received laser beam into the microresonator to generate a microcomb laser, a grating configured to filter the generated microcomb laser, an interferometer configured to split the generated microcomb laser into a sample arm and a reference arm, an OCT probe configured to generate tomograms of a target using the sample arm, and a spectrometer configured to obtain depth information from the interferogram and generate cross-sectional images of the target based on the obtained depth information.

Abstract: Systems and methods for soliton microcomb-based precision dimensional metrology via spectrally-resolved interferometry are described. In an embodiment, the system includes a dual-pumped soliton microcomb generator comprising a pump, a microresonator, and an auxiliary pump and that generates a single-soliton microcomb, an erbium-doped fiber amplifier that amplifies a C-band section of the soliton microcomb and a non-polarizing beam splitter that divides the soliton microcomb pulses into a reference arm pulse and a measurement arm pulse for an interferometer and recombines the reference arm pulse and the measurement arm pulse into a recombined beam upon their return.

Abstract: Systems and methods in accordance with embodiments of the invention implement all-microwave stabilized microresonator-based optical frequency comb. In one embodiment, an all-microwave stabilized microresonator-based optical frequency comb includes: an optical pump configured to generate pulses of light; a microresonator including an input configured to receive pulses generated by an optical pump and an output configured to generate an optical frequency comb signal characterized by frep and ?; where frep describes spacing of frequency components in the optical frequency comb; where the optical frequency comb includes a primary comb and a plurality of subcombs and ? is a frequency offset between subcombs; and two phase locked loops that phase lock frep and ? to low noise microwave oscillators by modulating output power and pump frequency of the optical pump.

Abstract: Systems and methods in accordance with embodiments of the invention implement all-microwave stabilized microresonator-based optical frequency comb. In one embodiment, an all-microwave stabilized microresonator-based optical frequency comb includes: an optical pump configured to generate pulses of light; a microresonator including an input configured to receive pulses generated by an optical pump and an output configured to generate an optical frequency comb signal characterized by frep and ?; where frep describes spacing of frequency components in the optical frequency comb; where the optical frequency comb includes a primary comb and a plurality of subcombs and ? is a frequency offset between subcombs; and two phase locked loops that phase lock frep and ? to low noise microwave oscillators by modulating output power and pump frequency of the optical pump.

Abstract: Based on graphene heterostructure in chip-scale silicon nitride microresonators, optoelectronic control and modulation in frequency combs via group velocity dispersion modulation can be demonstrated. By tuning graphene Fermi level from 0.50 eV to 0.65 eV via electric-field gating, deterministic in-cavity group velocity dispersion control from anomalous (?62 fs2/mm) to normal (+9 fs2/mm) can be achieved with Q factor remaining high at 106. Consequently, both the primary comb lines and the full comb spectra can be controllable dynamically with the on/off switching of the Cherenkov radiation, the tuning of the primary comb lines from 2.3 THz to 7.2 THz, and the comb span control from zero comb lines to ˜781 phase-locked comb lines, directly via the DC voltage.

Abstract: Methods and apparatus for providing dispersion-managed dissipative Kerr solitons on-chip are provided. Microresonators are also provided for producing such solitons. The solitons may be enabled by real-time dynamical measurements on frequency combs. Methods are further provided to determine the temporal structure of the intracavity field in both the fast time axis, with ultrafast time-lens magnifiers at 600 fs timing resolutions, and the slow time axis via optical sampling with a synchronized fiber frequency comb reference. An order-of-magnitude enlarged stability zone of the dispersion-managed dissipative Kerr solitons is achieved versus the static regimes.

Abstract: Based on graphene heterostructure in chip-scale silicon nitride microresonators, optoelectronic control and modulation in frequency combs via group velocity dispersion modulation can be demonstrated. By tuning graphene Fermi level from 0.50 eV to 0.65 eV via electric-field gating, deterministic in-cavity group velocity dispersion control from anomalous (?62 fs2/mm) to normal (+9 fs2/mm) can be achieved with Q factor remaining high at 106. Consequently, both the primary comb lines and the full comb spectra can be controllable dynamically with the on/off switching of the Cherenkov radiation, the tuning of the primary comb lines from 2.3 THz to 7.2 THz, and the comb span control from zero comb lines to ˜781 phase-locked comb lines, directly via the DC voltage.

Abstract: Methods and apparatus for providing all-optically generated, on-chip propagated and high-efficiency tunable plasmons are described. The plasmon generating apparatus includes a graphene based silicon nitride waveguide (GSiNW) utilizing ‘C+L’ band light sources and detectors that take advantage of the surface 2nd nonlinearity on graphene. The optical generation is accomplished via one or more optical communication lasers through the difference-frequency generation process. The THz frequency and intensity is tunable via an external gate voltage. Using such a device the optical to THz conversion may be made at least an order of magnitude more efficient than prior THz sources, and can be used to make chip-scale room-temperature THz sources, switches, modulators and detectors based on graphene.

Abstract: Methods and apparatus for providing dispersion-managed dissipative Kerr solitons on-chip are provided. Microresonators are also provided for producing such solitons. The solitons may be enabled by real-time dynamical measurements on frequency combs. Methods are further provided to determine the temporal structure of the intracavity field in both the fast time axis, with ultrafast time-lens magnifiers at 600 fs timing resolutions, and the slow time axis via optical sampling with a synchronized fiber frequency comb reference. An order-of-magnitude enlarged stability zone of the dispersion-managed dissipative Kerr solitons is achieved versus the static regimes.

Abstract: Methods and apparatus for providing all-optically generated, on-chip propagated and high-efficiency tunable plasmons are described. The plasmon generating apparatus includes a graphene based silicon nitride waveguide (GSiNW) utilizing ‘C+L’ band light sources and detectors that take advantage of the surface 2nd nonlinearity on graphene. The optical generation is accomplished via one or more optical communication lasers through the difference-frequency generation process. The THz frequency and intensity is tunable via an external gate voltage. Using such a device the optical to THz conversion may be made at least an order of magnitude more efficient than prior THz sources, and can be used to make chip-scale room-temperature THz sources, switches, modulators and detectors based on graphene.

Abstract: An integrated lens for wearable display devices is described. The integrated lens includes at least a lens, a protecting sheet, an optical waveguide integrated with the lens, and a clear sheet. The waveguide is smaller than the lens in size. The clear sheet is provided to supplement the waveguide to match the lens in size. The optical waveguide is sandwiched between the lens and the protecting sheet.

Abstract: An optomechanical oscillator for measuring a magnetic field may include a fixed substrate, a moveable mass separated from the fixed substrate by a slot, a photonic crystal comprising an optomechanical cavity formed at the slot, and a current source operably coupled to provide current to the photonic crystal. The moveable mass may be moveable responsive to placement of the optomechanical oscillator in a magnetic field based on interaction of the magnetic field and the current. The magnetic field may be measureable based on displacement of the moveable mass.

Abstract: An interferometer module for quantum processing is described including a substrate having two or more input ports and two or more output ports; multiple photonic pathways embedded in the substrate for conveying photons from the two or more input ports and the two or more output ports; and one or more partial beam splitters embedded in the substrate in a photonic pathway for generating spatial and polarization entanglement.

Abstract: An optomechanical oscillator for measuring a magnetic field may include a fixed substrate, a moveable mass separated from the fixed substrate by a slot, a photonic crystal comprising an optomechanical cavity formed at the slot, and a current source operably coupled to provide current to the photonic crystal. The moveable mass may be moveable responsive to placement of the optomechanical oscillator in a magnetic field based on interaction of the magnetic field and the current. The magnetic field may be measureable based on displacement of the moveable mass.

Abstract: Normal group velocity dispersion mode-locked optical frequency combs are provided on-chip. On-chip coherent frequency comb generation includes pulses showing temporal durations of about 74 fs. Pump detuning and bandpass filtering are provided for stabilizing and shaping the pulses from normal group velocity dispersion microresonators.

Abstract: Exemplary embodiments of an apparatus, method, and computer readable medium are provided for producing a radiation. For example, a radiation having at least one pulse with a pulse-width of less than approximately 30 picoseconds can be produced using a photonic crystal waveguide arrangement which is (i) specifically structured and sized so as to be placed on an integrated circuit, and (ii) configured to produce the radiation having at least one pulse with a pulse-width of less than approximately 30 picoseconds.

Abstract: Normal group velocity dispersion mode-locked optical frequency combs are provided on-chip. On-chip coherent frequency comb generation includes pulses showing temporal durations of about 74 fs. Pump detuning and bandpass filtering are provided for stabilizing and shaping the pulses from normal group velocity dispersion microresonators.

Abstract: A hybrid graphene-silicon optical cavity for chip-scale optoelectronics having attributes including resonant optical bistability for photonic logic gates and memories at femtojoule level switching per bit, temporal regenerative oscillations for self-pulsation generation at record femtojoule cavity circulating powers, and graphene-cavity enhanced four-wave mixing at femtojoule energies on the chip.