Abstract: The present disclosure discloses a method and apparatus for generating an optical frequency comb. The specific generation method comprises: receiving a pump laser that matches a thermally stable state of a nonlinear optical resonant cavity and causing the pump laser to oscillate in the nonlinear optical resonant cavity, such that a Brillouin gain corresponding to the pump laser coincides with a target longitudinal mode in the nonlinear optical resonant cavity; continuously generating a Brillouin laser at the target longitudinal mode in the case that a pump power of the pump laser exceeds a threshold for generating the Brillouin laser; and generating an optical frequency comb by using the Brillouin laser through a Kerr nonlinear four-wave mixing process. According to the technical solution of the present disclosure, the nonlinear optical resonant cavity with the Brillouin gain can generate an optical frequency comb in its thermally stable region.

Abstract: The present disclosure discloses a method and apparatus for generating an optical frequency comb. The specific generation method comprises: receiving a pump laser that matches a thermally stable state of a nonlinear optical resonant cavity and causing the pump laser to oscillate in the nonlinear optical resonant cavity, such that a Brillouin gain corresponding to the pump laser coincides with a target longitudinal mode in the nonlinear optical resonant cavity; continuously generating a Brillouin laser at the target longitudinal mode in the case that a pump power of the pump laser exceeds a threshold for generating the Brillouin laser; and generating an optical frequency comb by using the Brillouin laser through a Kerr nonlinear four-wave mixing process. According to the technical solution of the present disclosure, the nonlinear optical resonant cavity with the Brillouin gain can generate an optical frequency comb in its thermally stable region.

Abstract: Provided are a data signal detection device, and mobile industry processor interface radio frequency front-end device and system. The device includes: a first acquisition circuit, a second acquisition circuit and a selection output circuit. A first input terminal of the first acquisition circuit is connected to a second input terminal of the second acquisition circuit, and a second input terminal of the first acquisition circuit is connected to a first input terminal of the second acquisition circuit. Output terminals of the first acquisition circuit and the second acquisition circuit are connected to two input terminals of the selection output circuit. The acquisition circuit is configured to verify whether an acquisition signal meets a characteristic of a data signal; and the selection output circuit selects an acquisition signal from a received acquisition signal and a received invalid signal for output.

Abstract: Provided are a data signal detection device, and mobile industry processor interface radio frequency front-end device and system. The device includes: a first acquisition circuit, a second acquisition circuit and a selection output circuit. A first input terminal of the first acquisition circuit is connected to a second input terminal of the second acquisition circuit, and a second input terminal of the first acquisition circuit is connected to a first input terminal of the second acquisition circuit. Output terminals of the first acquisition circuit and the second acquisition circuit are connected to two input terminals of the selection output circuit. The acquisition circuit is configured to verify whether an acquisition signal meets a characteristic of a data signal; and the selection output circuit selects an acquisition signal from a received acquisition signal and a received invalid signal for output.

Abstract: A photonic chip based on periodical poling and waveguides circuits in ferroelectric crystals, the method is based on the integration of waveguide circuits, periodical poling and electro-optic modulator (EOM). The chip is illustrated by FIG. 1. The waveguide circuits guide the photons and makes linear operations like the beam splitting, filtering etc. on the photons. The periodical poling enables the efficient spontaneous parametric down conversion (SPDC), resulting the generation of entangled photons. The EOM controls the phase of photons dynamically. The following directional coupler distributes the entangled photons and the quantum interference takes place, resulting different types of path-entangled states by controlling the voltage of EOM insides the chip.

Abstract: A tunable coherent light source includes a pump laser for generating a pump beam and an optical parametric oscillator including a crystal exhibiting an output curve for a pump beam of a defined wavelength, the output curve defining wavelengths of signal and idler outputs based on periodically poled grating periods of the crystal. The crystal has a plurality of segments associated with a plurality of grating periods of the output curve, each segment of the plurality of segments having a different crystal structure. At least one of the plurality of segments comprises a crystal structure combining at least two of the grating periods A heating device heats the crystal to an elevated operating temperature and is adjustable for adjusting the output wavelengths of each of the segments.

Abstract: In general, in one aspect, the invention features a method that includes converting radiation at a first wavelength ?i to radiation at a second wavelength ?g and exposing an article to the radiation at ?g to convert the radiation at ?g to radiation at a third wavelength ?r and radiation at a fourth wavelength ?b. ?r is red radiation, ?g is green radiation, and ?b is blue radiation and the article includes lithium tantalate.

Abstract: A tunable coherent light source includes a pump laser for generating a pump beam and an optical parametric oscillator including a crystal exhibiting an output curve for a pump beam of a defined wavelength, the output curve defining wavelengths of signal and idler outputs based on periodically poled grating periods of the crystal. The crystal has a plurality of segments associated with a plurality of grating periods of the output curve, each segment of the plurality of segments having a different crystal structure. At least one of the plurality of segments comprises a crystal structure combining at least two of the grating periods A heating device heats the crystal to an elevated operating temperature and is adjustable for adjusting the output wavelengths of each of the segments.

Abstract: The design of a special type of optical superlattice and its application in the all-solid state laser is involved in this invention. Nd ions doped laser crystal in common use can radiate three relatively intense spectral lines when excited: the first wavelength is around 900 nm; the second wavelength is around 1064 nm; the third wavelength is around 1300 nm, whose accurate wavelength are depended on their host crystal (for example, to Nd:YAG, they are 946 nm, 1064 nm and 1319 nm, respectively). On the other hand, for LiNbO3 (LN), LiTaO3 (LT), KTP and other ferroelectric crystals, the positive and negative 180° ferroelectric domains in these crystals can be arranged orderly according to certain sequence via crystal growth, electric field poling, and other state-of-the-art domain reversion technique, forming superlattice that is applicable to quasi-phase-matching (QPM) laser frequency conversion.

Abstract: The design of a special type of optical superlattice and its application in the all-solid state laser is involved in this invention. Nd ions doped laser crystal in common use can radiate three relatively intense spectral lines when excited: the first wavelength is around 900 nm; the second wavelength is around 1064 nm; the third wavelength is around 1300 nm, whose accurate wavelength are depended on their host crystal (for example, to Nd:YAG, they are 946 nm, 1064 nm and 1319 nm, respectively). On the other hand, for LiNbO3 (LN), LiTaO3 (LT), KTP and other ferroelectric crystals, the positive and negative 180° ferroelectric domains in these crystals can be arranged orderly according to certain sequence via crystal growth, electric field poling, and other state-of-the-art domain reversion technique, forming superlattice that is applicable to quasi-phase-matching (QPM) laser frequency conversion.