63 results about "Bias tee" patented technology

Both a system and method for optically powering a network component, such as the transponder of a picocell, is provided. The system includes a vertical cavity surface emitting laser (VCSEL) for processing an input signal, a remotely-located optical power source, and an optical fiber for conducting optical power from the source to the VCSEL. The VCSEL may be electrically biased from current generated by an optical-electro converter coupled to the fiber, or directly optically biased from light from the optical power source. A bias tee is connected between an input signal and an input of the VCSEL such that the VCSEL generates a modulated optical signal. The system may be the transponder of a picocell system where the VCSEL generates an optical uplink signal conducted to a head-end circuit via the same or a separate optical fiber.

The invention discloses a method and a device for implementing a Ramsey-CPT atomic clock by microwave On-Off modulation VCSEL. The method comprises the following steps of: A, coupling direct current and microwave to a laser tube, scanning the direct current to obtain a plurality of absorption peaks and locking the direct current; B, switching on and off the microwave to realize equivalent laser pulse, and scanning the microwave to obtain Ramsey-CPT stripes; and C, locking the microwave to obtain stable frequency output. The device is characterized in that: a current source is connected with a Bias-Tee, a microwave source is connected with the Bias-Tee through a microwave switch, the Bias-Tee is connected to a laser generating device, the output laser passes through a physical system and then enters a laser detection device, and control equipment is connected with the current source, the microwave source, the microwave switch and the laser detection device respectively. The method and the device realize laser-atom periodic interaction through microwave On-Off, have a more predominant frequency discrimination curve compared with the traditional CPT scheme, and implements the atomic block with higher stability. Compared with the Ramsey-CPT atomic clock implemented by using the AOM with larger volume and higher power consumption, the device has a simple structure, adopts a unique method, is easy for microminiaturization, and overcomes the key technology of the chip Ramsey-CPT atomic clock.

Accordingly, a preferred embodiment of the present invention comprises an electro-optical device having an optical waveguide that includes two optical pathways, wherein the optical waveguide is embedded within the substrate. A bias electrode layer is formed on the surface of the substrate. A buffer layer is formed on at least a portion of the bias electrode layer and the surface of the substrate. An RF electrode layer is formed on the buffer layer. A bias-tee electrically couples the bias electrode layer and the RF electrode layer.

A coil package which makes it easy to handle a high-frequency cone / pyramid-shaped coil and enhance frequency characteristics without degrading the characteristics of the coil. The cone / pyramid-shaped coil has a conical or pyramidal shape formed by wiring a conductor wire around an outer peripheral surface of a core such that the winding diameter of the coil progressively decreases from one end to the other end of the coil. The coil and a dielectric substrate are integrated with each other by forming a hole for inserting a tip portion of the coil in the dielectric substrate, making the bottom of the hole and a back surface of the dielectric substrate electrically continuous by a via, placing the coil in the hole by directing a small-diameter side of the cone / pyramid-shaped coil to the hole, electrically connecting the bottom of the hole and a tip-side lead wire extending from the coil to each other, and connecting an electrode on a large-diameter side of the coil to an electrode on the dielectric substrate.

A bias tee for connecting a measurement device to a DUT, where the measurement device has a guard output, includes a DC port; a HF port; and a measurement port. The HF input port is guarded with the guard output during operation of the bias tee.

A transistor-outline TO-can type optical module includes a stem, a sub-mount arranged in the stem and a laser diode (LD) is mounted in the sub-mount. A photo diode (PD), which has an inclined light incident surface, converts light emitted from the LD to current. A plurality of leads is extended through the stem while electrically being connected to the sub-mount. The inclined light incident surface of the PD permits that sufficient monitoring of photocurrent can be obtained and a p-side up bonding of a p-type electrode is allowed. Thus, the SMSR of the LOB is increased. A bias-tee is built in the TO-can to reduce heat caused by DC current and to increase opto-electric efficiency while suppressing an increase in the temperature of an LD chip.

A miniature wideband bias tee that has a small package size. The bias tee has a low temperature co-fired ceramic substrate with a top surface and a bottom surface. A first inductor is located within the substrate. A second inductor is attached to the top surface and has a core with a wire wound on the core. Terminals are located on the top and bottom surfaces. Ends of the wire are connected to terminals on the top surface. A capacitor is mounted to terminals on the top surface. Several vias extend through the substrate and electrically connect the terminals to the inductor and capacitor.

The Invention comprises a method and Interface for powering and controlling an antenna, having an RF signal input, an AISG signal input, including a DC current, wherein the RF signal input is coupled to the antenna by a filter, so the filter blocks a signal with DC current, and the AISG signal is coupled to the antenna through a switch, so that if an AISG signal is present, the switch automatically allows the AISG signal through to the antenna for control of the antenna, and if no AISG signal is present, the RF signal is automatically allowed through to the antenna for control of the antenna.

A power amplifier (PA) system includes an amplifying transistor having a base, a collector, and an emitter. The PA system further includes a radio-frequency (RF) input configured to receive an RF input signal having an RF component and a DC bias component, a bias circuit coupled to the base of the amplifying transistor, and a bias tee circuit configured to receive the RF input signal and pass at least a portion of the DC component to the bias circuit and at least a portion of the RF component to the base of the amplifying transistor.

In an FET-characteristic measuring method, a predetermined bias voltage output from an output terminal of a bias tee is applied to the drain of an FET, and a pulse output from a pulse generator is applied to the gate thereof to thereby cause drain current to be generated. The drain current is converted by a load impedance, connected to an AC output terminal of the bias tee, into a voltage pulse, and is measured based on the voltage pulse. The method includes increasing the bias voltage by an amount corresponding to a voltage drop caused by the load impedance and repeating measurement of a value of the voltage pulse a predetermined number of times, and applying extrapolation to the last two values of the voltage-pulse values obtained by the predetermined number of repeated measurements to determine a drain voltage to be applied to the FET.

The invention relates to the field of material surface magnetism measurement. A high-frequency magnetic spectrograph comprises a pulse laser, a time delayer, a 1 / 4 wave plate, a concave lens, a firstconvex lens, a plane mirror, a polaroid, a beam splitter, a second convex lens, a lens table, a first atomic force microscope, a first probe, a lens seat, an objective lens, a sample, a wave guide, asample table, a signal generator, an oscilloscope, a detector, a bias three-way valve, a first amplifier, a frequency mixer, a second amplifier, an analog-digital converter, a computer, a second atomic force microscope, a second probe and a phase sensitive detector. A single nanometer structure can be measured; the measurement on the magnetization dynamic state of the sample surface has the spaceresolution ratio of the submicron grade; the magnetization information on the nanometer scale sample surface is obtained by using a high-precision positioning device; two different atomic force microscope needle points are used for respectively performing contact mode atomic force microscope scanning and near field time resolution Magneto-Optical Kerr effect experiments; a frequency domain methodis used for detecting the GHz frequency band magnetization dynamic states on the surface of the sample.