17 results about "Comb generator" patented technology

In a general aspect, a quantum spectrum sensing system is presented. In some implementations, a quantum spectrum sensing system includes a laser system, a vapor cell sensor, and an optical detector. The laser system includes first and second lasers configured to generate a first and second laser signals. The laser system also includes first and second comb generators configured to produce first and second frequency comb signals based on the first and second laser signals, respectively. The laser system includes a frequency separator that can select frequency components of the second frequency comb signal and a frequency shifter that can shift the selected frequency components toward Rydberg states of a vapor. The vapor cell sensor can receive input optical signals from the laser system and produce output optical signals based on interactions of the vapor with the input optical signals. The optical detector can detect the output optical signals.

An optical comb generator receives light from at least two continuous wave laser sources, produces a different frequency comb from each laser source, and produces an output that it the simultaneous combination of the different frequency combs. The different frequency combs span different frequency bands, but at least partially overlap in frequency with an adjacent comb in a region of overlap. A spectral filter produces a filtered output that has at least one pair of tones from the region of overlap, the pair of tones comprising one tone from each of two adjacent combs. Feedback control based on the filtered output is applied to adjust the light entering the comb generator such that the frequencies and phases of the pair of tones from the region of overlap are aligned. In this way, the multiple different overlapping combs are stitched together to form a single seamless comb spanning a broader frequency range.

In a general aspect, a quantum spectrum sensing system is presented. In some implementations, a system includes a laser system, a vapor cell sensor, an optical detector, and a signal processing system. The laser system includes a first laser that generates a first laser signal; a comb generator that produces a frequency comb signal based on the first laser signal; and a second laser generates a second laser signal. The vapor cell sensor includes a vapor and receives input optical signals based on the frequency comb signal and the second laser signal. The vapor cell sensor produces output optical signals based on interactions of the vapor with the input optical signals and electromagnetic radiation. The signal processing system processes the output optical signals to identifying signals in the electromagnetic radiation that are off resonance with a transition frequency between Rydberg states of the vapor.

In a general aspect, a quantum spectrum sensing system is presented. In some implementations, a system includes a laser system, a vapor cell sensor, an optical detector, and a signal processing system. The laser system includes a first laser that generates a first laser signal; a comb generator that produces a frequency comb signal based on the first laser signal; and a second laser generates a second laser signal. The vapor cell sensor includes a vapor and receives input optical signals based on the frequency comb signal and the second laser signal. The vapor cell sensor produces output optical signals based on interactions of the vapor with the input optical signals and electromagnetic radiation. The signal processing system processes the output optical signals to identifying signals in the electromagnetic radiation that are off resonance with a transition frequency between Rydberg states of the vapor.

In a general aspect, a quantum spectrum sensing system is presented. In some implementations, a quantum spectrum sensing system includes a laser system, a vapor cell sensor, and an optical detector. The laser system includes first and second lasers configured to generate a first and second laser signals. The laser system also includes first and second comb generators configured to produce first and second frequency comb signals based on the first and second laser signals, respectively. The laser system includes a frequency separator that can select frequency components of the second frequency comb signal and a frequency shifter that can shift the selected frequency components toward Rydberg states of a vapor. The vapor cell sensor can receive input optical signals from the laser system and produce output optical signals based on interactions of the vapor with the input optical signals. The optical detector can detect the output optical signals.

An optical data communication system includes an optical power supply and an electro-optical chip. The optical power supply includes a laser that generates laser light at a single wavelength. A comb generator receives the light at the single wavelength and generates multiple wavelengths of continuous wave light from laser light at the single wavelength. The multiple wavelengths of continuous wave light are provided as light input to the electro-optical chip. The electro-optical chip includes at least one transmit macro that receives the multiple wavelengths of continuous wave light and that modulates one or more of the multiple wavelengths of continuous wave light to generate modulated light signals that convey digital data.

The application provides a radio frequency comb generator, a preparation method and a signal generation method, and belongs to the technical field of radio frequency microwave signal sources.The application comprises a silicon substrate, an insulating layer arranged on the silicon substrate, a resonant cavity formed in the insulating layer, a gate electrode arranged at the bottom of the resonant cavity, a source electrode and a drain electrode arranged on both sides of the resonant cavity, a two-dimensional material diaphragm bridged between the source electrode and the drain electrode and suspended above the resonant cavity, an electric parameter excitation circuit connected with the gate electrode and used for applying a direct current bias voltage and an alternating current pumping voltage between the gate electrode and the two-dimensional material diaphragm, and a light direct driving unit used for applying intensity modulation laser to the two-dimensional material diaphragm.The application realizes the cooperative work of electric parameter excitation and light direct driving, has the advantages of low power consumption, large comb tooth spacing, strong adjustability, easy on-chip integration and the like, and can be widely applied to multiple fields.

Apparatus and methods are presented for spectral domain optical imaging, in particular for single shot 3-D spectral domain imaging of the retina or angio-OCT applications, using an extended illumination field comprising a plurality of linearly displaced combs of wavelengths selected from across the light source bandwidth. This allows recovery of phase and amplitude information at many times the Nyquist depth, without the loss of optical power that would be incurred by traditional wavelength comb generators such as etalons. Spatially incoherent or partially spatially incoherent light sources can be used in certain embodiments. In certain embodiments a temporally modulated angular component is imposed on a short axis of the extended illumination field. In preferred embodiments light reflected or scattered from the object is sparsely sampled in the far field, e.g. at a Fourier plane, in a dimension perpendicular to the long axis of the extended illumination field.

Disclosed are schemes for analog dual-comb sensing with a continuous-wave local oscillator that provides analog dual-comb sensing and overcome limitations of the prior art, analog DCS schemes. Operationally, one optical frequency comb (OFC) is intensity modulated by an analog RF comb generator (such as SRD, NLTL, etc.) while the other OFC is phase-modulated by another analog RF comb generator having a slightly different frequency spacing. The intensity-modulated OFC, (in narrow-pulse shape) is used as the “probe” to measure a medium under test, while the phase-modulated OFC (in continuous waves) is used as a “local oscillator” and beat with the “probe” comb and amplify the output. In the detection stage, our schemes take the advantage of polarization diversity coherent detection, eliminating fading that infirmed previous schemes due to the polarization drift and phase noises.

A system is provided herein. The system includes an electro-optic modulated (EOM) comb generator including an opto-electronic oscillator (OEO) loop to modulate a continuous-wave seed source and form an EOM comb, a saturable absorber to perform non-linear pulse shaping of the EOM comb, and a tunable filter having resonances matching a frequency spacing of the EOM comb. The tunable filter filters the EOM comb from the saturable absorber to provide an output EOM comb.

An atomic inertial interferometer comprises a laser that emits a CW beam; a modulator that modulates the CW beam; a filter and delay mechanism that receives the modulated beam, and includes a first pathway and a second pathway longer than the first pathway; a comb generator that receives the modulated beam, and produces a frequency comb; and a comb drive coupled to the comb generator to generate a multiple of a comb repetition rate, the comb drive including a HF source coupled to a bandpass filter. A vacuum cell holds a sample of cold atoms. The frequency comb counter-propagates with respect to the modulated beam to provide velocity slicing of the cold atoms such that a given temperature distribution of the cold atoms is sliced into a plurality of narrow temperature distributions that are probed individually and in parallel, to extract an interference signal from the narrow temperature distributions.

To provide an optical data communication system, a method, and an electro-optic chip that include a compact and efficient optical power supply.SOLUTION: In an optical data communication system, an electro-optical chip is optically connected to an optical power supply including a laser that generates continuous wave light of a single wavelength, and a comb generator that optically connected to the laser to receive the single wavelength continuous wave light as input light and generates multiple wavelengths of continuous wave light from the input light, and comprises at least one transmitter macro that receives the multiple wavelengths of continuous wave light and modulates one or more of the multiple wavelengths of continuous wave light to generate a modulated optical signal that carries digital data.SELECTED DRAWING: Figure 14

A device includes a substrate; a laser chiplet supported by the substrate; a comb generator chiplet supported by the substrate and in optical communication with the laser chiplet; an optical switch chiplet supported by the substrate and in optical communication with the comb generator chiplet; and a glass layer supported by the substrate and comprising one or more waveguides, at least one of the waveguides optically connecting the comb generator chiplet to the optical switch chiplet. The laser chiplet, the comb generator chiplet, the optical switch chiplet, and the glass layer lie in a common plane.

The present invention discloses a method for frequency synthesis of even-order signals with low phase noise and low spurious signals, which belongs to the field of frequency synthesis technology and comprises the steps of: utilizing an anti-phase coherent reference signal input to a comb generator to generate a comb signal with odd-order inversion and even-order in-phase characteristics, and adopting an in-phase coupler to perform power synthesis. Because power synthesis is vector superposition, the in-phase signal is superimposed and the anti-phase signal is cancelled, thereby realizing even-order signal extraction and odd-order signal suppression, thereby realizing half reduction of the spurious frequency points of the comb spectrum, doubling the frequency difference between adjacent spurious points of the main signal and the main signal, reducing the difficulty of filter design and reducing the implementation volume. At the same time, a narrowband coupler is utilized to reflect the signal outside the passband and has no parasitic passband characteristics, thereby solving the problem of far-end parasitic passband in a single-stage bandpass filter, filtering out the near-end and far-end spurious of the main signal, and realizing frequency synthesis with higher spurious suppression and lower phase noise in a smaller volume.

An optical data communication system includes an optical power supply and an electro-optical chip. The optical power supply includes a laser that generates laser light at a single wavelength. A comb generator receives the light at the single wavelength and generates multiple wavelengths of continuous wave light from laser light at the single wavelength. The multiple wavelengths of continuous wave light are provided as light input to the electro-optical chip. The electro-optical chip includes at least one transmit macro that receives the multiple wavelengths of continuous wave light and that modulates one or more of the multiple wavelengths of continuous wave light to generate modulated light signals that convey digital data.

In a general aspect, a quantum spectrum sensing system is presented. In some implementations, a quantum spectrum sensing system includes a laser system, a vapor cell sensor, and an optical detector. The laser system includes first and second lasers configured to generate a first and second laser signals. The laser system also includes first and second comb generators configured to produce first and second frequency comb signals based on the first and second laser signals, respectively. The laser system includes a frequency separator that can select frequency components of the second frequency comb signal and a frequency shifter that can shift the selected frequency components toward Rydberg states of a vapor. The vapor cell sensor can receive input optical signals from the laser system and produce output optical signals based on interactions of the vapor with the input optical signals. The optical detector can detect the output optical signals.