110 results about "Velocity of light" patented technology

A lamination of metal wire layers forms an electromagnetic isolation structure. The metal wire layers are connected with each other by vias, so that a metal fence having a laminated structure is formed. The metal fence is provided so as to surround an element (e.g. a spiral inductor) that generates an electromagnetic field in an integrated circuit. The metal wire satisfies d≦λ/8, WF≧5δ, and L≦λ/20, where δ is a skin depth of an electromagnetic wave, c is a velocity of light, f is an operating frequency of the integrated circuit, d is a lateral-direction size of a metal-fence region, WF is a surrounding-line width of the metal fence, L is an interval between the vias, and λ=c/f is a wavelength of a signal. With this arrangement, it is possible to decrease electromagnetic coupling noises and coupling noises caused via the substrate.

A wireless communication system of a simple configuration enabled to perform both data communication and accurate ranging. In the system, a second wireless unit receives a ranging signal after a lapse of a propagation time since a first wireless unit transmits the ranging signal. Then, after a delay of an image elimination period, the second wireless unit transmits a response signal. The first wireless unit receives the response signal after a lapse of a propagation time. Then, the first wireless unit obtains the propagation time, during which the signal propagates between the first and second wireless unit, according to an elapsed time since the ranging signal is transmitted. The distance therebetween is obtained by dividing the obtained propagation time by the velocity of light. Before the image elimination period elapses, in order to eliminate the physical reflection of radio waves, the first wireless unit is inhibited from opening a reception gate.

The present invention relates to an optical modulator, divided into at least two active segments separated by at least one passive segment. The modulator comprises: an optical waveguide with an optical group index n_o having an optical signal propagating at an optical velocity v_o, and a microwave transmission line with an electrical propagation index n_p, having an electrical signal propagating at an electrical velocity V_e. The electrical propagation index n_p of the unloaded microwave transmission line is lower than the optical group index n_o of the optical waveguide. The loading and length of the microwave transmission line are adjusted for a specific Bloch impedance and electrical velocity v_e. The invention also relates to a method for adapting the impedance of an optical modulator.

A photonic integrated circuit (PIC) is described. This PIC includes a semiconductor-barrier layer-semiconductor diode in an optical waveguide that conveys an optical signal, where the barrier layer is an oxide or a high-k material. Moreover, semiconductor layers in the semiconductor-barrier layer-semiconductor diode may include geometric features (such as a periodic pattern of holes or trenches) that create a lattice-shifted photonic crystal optical waveguide having a group velocity of light that is lower than the group velocity of light in the first semiconductor layer and the second semiconductor layer without the geometric features. The optical waveguide is included in an optical modulator, such as a Mach-Zehnder interferometer (MZI).

The invention discloses an ROADM node, an optical wavelength correction frequency shifter and an implementation method. The wavelength correction frequency shifter comprises a sawtooth wave electric signal generator and an electro-optic phase modulator, wherein the sawtooth wave electric signal generator produces continuous sawtooth wave electric signals with the repetition frequency of F, which serve as driving electric signals, and the electro-optic phase modulator loads driving electric signals to conduct frequency shift delta fi on the central wavelength of input optical signals, so that the central wavelength lambada i of input optical signals is close to the expected central wavelength lambada i-1, and c represents the velocity of light. According to the ROADM node, the optical wavelength correction frequency shifter and the implementation method, the central wavelength of input optical signals is close to the designed central wavelength of an ROADM through correction of the central wavelength of input optical signals, so that the effective bandwidth loss of the ROADM, which is caused by the multistage filtering cascaded filtering function, is reduced, an all-optical method is used for correcting the wavelength of optical signals, and the implementation method is applicable to ROADM nodes of any wavelength multiplexing wavelength division multiplex (WDM) optical networks of various transmission rates.

The invention discloses a tiled photon neural network convolution layer chip. The chip is universal for all the neutral network calculation including a convolution layer. To-be-operated data are represented in photonic integrated devices through light amplitude, a function of data operation is formed through cascaded connection and networking of the photonic integrated devices and an operation result is output in real time. By utilizing the adjustability of the photonic integrated devices, any signal can be modulated at the light amplitude, so that convolution calculation of any to-be-convoluted signal is realized. As the photonic information processing speed is at a constant level (that is velocity of light), the convolution calculation of a traditional computer framework can be increasedby multiple order magnitudes. Meanwhile, the tiled photon neural network convolution layer chip has a low energy consumption ratio.

The invention discloses a method and a device for estimating the moving velocity of a terminal. The method comprises the following steps: a, calculating Doppler frequency shift delta(f) and a first derivative delta(f') of the delta(f); and b, utilizing the calculated delta(f) and delta(f') to obtain the moving velocity of the terminal v according to a formula shown on the right. In the formula, cis the velocity of light; and f0 is centre carrier frequency. The method in the invention can accurately estimate the moving velocity of the terminal by utilizing the formula shown on the right.

The invention provides an electro-optic analog-digital conversion method based on cascade structural LiNbO3 waveguide M-Z intensity modulator array; by arranging the number and direct current polarization of M-Z intensity modulators in the cascade structural LiNbO3 waveguide M-Z intensity modulator array, an output light intensity function of corresponding bits is obtained; identical modulation signal voltage is applied on each M-Z modulator of the cascade structural LiNbO3 waveguide M-Z intensity modulator array to carry out intensity modulation on the sampling light pulse so as to obtain light sampling of the modulation signal; light threshold is set to obtain phase bit code of the sampling light pulse followed by light-electricity conversion and comparison to obtain the phase bit code, thus realizing electro-optic analog-digital conversion. The electro-optic analog-digital conversion method based on cascade structural LiNbO3 waveguide M-Z intensity modulator array provided by the invention enhances preciseness of analog-digital conversion by adding number of cascade intensity modulators, overcomes the limit of Taylor scheme on sampling preciseness, which is mainly caused by index increase of electrode length along with the increase of bits. On the other hand, the invention inherits the characteristics of high sampling velocity of light sampling, thus having the characteristics of high sampling preciseness and high sampling velocity.

The invention provides a three-dimensional high-speed wide view field tomography method and a device thereof. The method comprises the following steps: 1, generating light beams; 2, performing high-speed space-time focusing surface scanning: performing dispersion and parallel collimation on the light beams, applying different phases to the light beams with different wavelengths/frequencies to carry out modulation in order to make the light beams have different time delays, and converging the modulated light beams onto a sample in order to form a focusing surface; 3, performing expanded field depth detection: arranging a high-speed zoom lens on the conjugate plane of the pupil entrance surface of an objective lens for lights formed by exiting the sample to achieve excitation end axial scanning synchronized imaging of object planes with different depths; and 4, simultaneously controlling: simultaneously controlling the light velocity modulation in the high-speed space-time focusing surface scanning step and the high-speed zoom lens in the developed field depth detection step. The method can improve the imaging speed and realize the high-time resolution three-dimensional imaging underthe premise of ensuring the spatial resolution.

The invention relates to a projection device which comprises: an optical assembly, a body and a camera lens arranged on the body. Internal light beams of the body are projected through the camera lens so as to form an image in a first imaging area. The optical assembly is detachably arranged on a light path of the camera lens so as to reflect the light beams projected by the camera lens and to make the reflection light beams to form the image in a second imaging area. The first imaging area is intersected with the second imaging area. In the projection device, the light path of the light beam projected by the camera lens is changed by the optical assembly which is arranged on the light path of the camera lens so that the imaging of the projection device can switch between the first imaging area and the second imaging area. Furthermore, a projection direction of the projection device can be changed.

The invention discloses a system using an electronic deflection to form flying spot radiation and a flying spot scanning method. The system comprises an X-ray source and a pinhole device, wherein the X-ray source has a deflecting coil, an electron emitted by a cathode is deflected by a magnetic field of the deflecting coil to form a deflection electron, the deflection electron falls on an anode target spot to form an X-ray beam, and a transmission is performed by the pinhole device to the X-ray beam to form a flying spot. By mean of the embodiment of the system and the method using the electronic deflection to form the flying spot, the movement speed of the flying spot is not limited by the mechanical motion, the light velocity can be theoretically reached, and the scanning efficiency using the flying spot is improved.

The invention belongs to the photoelectric detection technology, relating to a detection method for measuring speed errors of a laser velocimeter and a detection device thereof, wherein the invention uses the time difference(t) to be multiplied by the light velocity to represent the distance; as for the laser velocimeter sending measuring impulses at a fixed cycle, the continuously changing distance is of a diffuse reflection echo wave of a moving object, and the velocity value of the moving object is obtained by the laser velocimeter receiving the echo wave; the standard laser velocity value can be freely set and is constantly unchanged during a measuring process of the velocimeter, thereby ensuring the quality of speed measurement. The method can freely set the distance of the moving object and imitate speeds of the object in different distances; if the time difference (t) evenly increases or decreases, a moving object which moves away or moves closer in an uniform velocity is created.