Showing papers on "Splitter published in 1990"

Individually fed multiloop antennas for electronic security systems

Abstract: An antenna system for use in an electronic security system transmitter (10) or receiver (12) having two or more loops. Each loop (24,26,28,30,40,42,44,46) of the transmitter or receiver antenna system (14,16) being individually connected to a splitter network (20) in the transmitter (10) and a combiner network (22) in the receiver (12).

Confocal type laser scan microscope with integrated illumination, detection and waveguide system

Abstract: A confocal type laser scan microscope comprises a substrate including a first channel wave guide having a first end and having the other end connected to a connecting port of a mode splitter, a second channel wave guide having a second end and having the other end connected to the mode splitter and a third channel wave guide having a third end and having the other end connected to the connecting port of the mode splitter; a laser diode connected to the first end for supplying a light to the first channel wave guide; a microscope optical system arranged at the second end which is conjugate with a sample surface relative to the microscope optical system; and a photo-detector connected to the third end for detecting the light from the second end.

Optical interconnect arrangement

Abstract: AN OPTICAL INTERCONNECT ARRANGEMENTAbstract An arrangement for butt coupling of waveguide electrooptic plates to form a crossbar switch. The arrangement includes a stack of M splitter plates, each of which routes an injected optical signal to one of N outputs, and a stack of Ncombiner plates, each of which routes the signal of a selected one of M inputs to a common output. The stack of splitter plates is rotated with respect to the stack of combiner plates and the output signal ports of the splitter plates are coupled to the input signal ports of the combiner plates, so that each output of an splitter plate is connected to a different combiner plate. Within each splitter plate there is a fan-out network of waveguide electrooptic couplers and each coupler, under electric control, routes signals from one input to either one of two outputs. With j levels of such interconnected couplers 2j output are developed. The combiner plates have an identical architecture but with a signal flow in the reverse direction. Butt coupling of the splitter and combiner plates is achieved by employing splitter and combiner plates of a different crystal cut, by interposing polarization rotation means between the two stacks, or by including polarization rotation means within the splitter plates, the combiner plates, or both.

Effects of Splitter Plates on the Wake Flow Behind a Bluff Body

Abstract: The effects of splitter plates on the wake behind a two-dimensional bluff body with fixed separation points has been experimentally studied for low Reynolds numbers between 0.35 x 103 and 1.15 x 103. A rectangular cylinder was chosen as a bluff body to have the location of the separation points fixed independent of the flow situation and the air velocity. Three sizes of splitter plates were used; these plates were mounted in the center plane of the cylinder at various distances downstream of the cylinder. Detailed measurements of shedding frequency, base pressure, coherence function, and correlation coefficient were obtained. The results indicate that splitter plates alter the manner of vortex formation in the wake causing a decrease in shedding frequency, an increase in base pressure, and a reduction in the overall drag by up to 50%. The effects of splitter plates on the wake-flow characteristics are discussed.

Beam combining/splitter cube prism for color polarization

Abstract: A cube bi-prism for beam combining and/or splitting through color and polarization multiplexing.

Method for upshifting a compound semi-blocked splitter type automatic mechanical transmission

Abstract: An improved control method and control system for controlling the upshifting of an AMT (10) system including a compound splitter type semi-blocked transmission (12) is provided. In particular, different control logic is utilized to implement simple and compound upshifts of the transmissions.

Radio frequency field coil and power splitter for nmr

Abstract: A radio frequency coil for use in MR imaging applications includes a series of conducting segments aligned with the longitudinal, static magnetic field of the MR magnet. A hybrid power splitter/combiner feeds each axial segment with a phased signal to generate a transverse circularly polarized magnetic field. The power splitter combiner isolates the axial segments to reduce magnetic field distortions produced by capacitive coupling between the imaged object and the radio frequency coil. The axial segments are tuned to series resonance to further reduce capacitive coupling. A stepped shield design permits separation of the power splitter combiner from the axial segments without piercing the bore tube.

Dual mode diplexer/multiplexer

Abstract: A broadband diplexer for use in dividing input signals in accordance with frequency and in constructing multiplexers including multiple diplexers The diplexer includes a pair of 0-degree couplers one of which is configured as a signal splitter while the other is configured as a signal combiner A pair of filters having identical frequency selection characteristics but opposite impedance and admittance characteristics are connected in between the splitter and the output port of the combiner In operation, input signals are received at the input port to the splitter and output signals are provided at the isolation port of the splitter and the output port of the combiner The coupler and filters act in combination to divide the input signals in accordance with frequency so that the output signals have complementary spectra The use of 0-degree couplers allows for very broadband performance by the diplexer

High-speed modulator for the polarization of an optical carrier

Abstract: The modulator comprises an integrated optical switch (6) receiving at an input a linearly-polarized optical carrier and transferring same to a first or a second output (P3, P4), according to the logic values of the bits of a modulating binary data signal. The radiations outgoing from the switch are sent to a polarizing beam splitter (13) with their original polarization or with a polarization rotated by 90° depending on the switch output (P3, P4) from which they come. A signal with the original polarization or with the polarization rotated by 90° is present at the splitter output, depending on the logic values of the bits of the modulating signal.

Auxiliary transmission shift control system

Abstract: An auxiliary transmission shift control system which combines the pressurized air supply lines for the range and splitter control switches mounted on the gear range selector lever in the vehicle cab and, therefore, eliminates one pressurized supply line. The interlock function (preventing shifting the splitter ON while in LOW range) is accomplished by preventing depressurization of the OFF side of the splitter cylinder if the range cylinder is in LOW position. Depressurization is prevented by pressurizing the OFF side of the splitter cylinder via a passageway connecting with the LOW side of the range cylinder.

Manual control for extended range splitter type compound transmission

Abstract: A control for an extended range splitter type compound transmission (10) comprising a main transmission section (12) connected in series with a splitter type auxiliary transmission section (14) connected in series with an extended range section (15) is provided. The main section shift lever (72) has a first (1) and a second (1E) position for selection of low ratio (50). Selection of the second position (1E) will automatically cause the extended range section clutch (206) to be shifted to the speed reduction position thereof.

Compressor splitter for use with a forward variable area bypass injector

Abstract: The present invention is a unique splitter of a core engine compressor in a double bypass, variable cycle engine. The splitter is extended forward to a second fan section. The extended splitter may divide the rotor blades into outer and inner portions to allow the flow past these portions to act essentially aerodynamically independent of each other in a single or double bypass mode of operation of the variable cycle engine.

Method for measuring refractive index distribution and transmitted wave front and measuring instrument used for the method

Abstract: PURPOSE: To accurately measure the distribution of refractive indexes of an object to be measured or a transmitted wave front by providing the measuring instrument with a Fizeau's interferometer, a television (TV) camera, a frame memory, an arithmetic part, a display, and so on. CONSTITUTION: The Fizeau's interferometer is constituted of a laser 2, lenses 4, 5, a half mirror 6, a reflector 7, and a beam splitter 8. Lenses 10, 11 are used for condensing light to the TV camera 9 for photoelectrically detecting light separated by the splitter 8. The frame memory 12 stores an interference fringe photoelectric detection result detected by the camera 9 and converted into binary signal data by an A/D converter. The arithmetic part 13 having a refractive index distribution calculating means analyzes interference fringe based upon the binary signal data of the detection result stored in the memory 12 to find out the refractive index distribution of the object 15 to be measured and the display 14 displays the found refractive index distribution or the like. The measuring instrument for measuring a transmitted wave front has the same structure as the refractive index distribution measuring instrument 1, but its arithmetic part is provided with a transmitted wave front calculating means instead of the refractive index distribution calculating means. COPYRIGHT: (C)1991,JPO&Japio

Broadband N-way active power splitter

Abstract: A power splitter (10), including a feedback amplifier (16) and matching network (18), is disclosed for splitting the output of a signal source (12) to be applied to a processing system (14). The feedback amplifier includes a gain stage (20) and active load (22). The gain stage includes a field-effect transistor (FET) (Q1) and feedback components (LF and RF) that provide the amplification required to give the power splitter unity gain. An inductive element (LD) gives the amplifier the desired bandwidth and a dual-gate FET (Q2) is employed as the active load to reduce loading of the gain stage. The matching network includes a plurality of stages (e.g., 24), each of which includes a source follower FET (e.g., Q3 ) and a single-gate active load FET (e.g., Q4). The resultant power splitter provides the desired equal power, matched phase outputs with suitable isolation and minimal insertion losses.

Optical recording and reproducing device

Abstract: PURPOSE:To improve the efficiency of a data processing at the time of rewriting and postscribing data by converging two laser beams with different wavelength on a recording medium by an objective lens, and separating and detecting transmission light and reflected light by an optical BPF. CONSTITUTION:Lasers 1 and 2 are shifted corresponding to a quantity of chromatic aberration, and are arranged in a metallic can case 3. The emission rays of light of the lasers 1 and 2 are reflected on a mirror 6 after passing a beam splitter 5, and converged on the recording plane of a magneto-optical disk 8. Out of the light transmitting the disk 8, only that of the laser 2 is made incident on an analyzer 10 by the BPF9, then, a data signal can be obtained. Meanwhile, the reflected light from the disk 8 is reflected on the splitter 5, and only the laser 1 passes the BPF12, then, a tracking servo signal and a focusing servo signal can be obtained via a beam splitter 13. Since the spot of the laser 2 is converged before the laser 1, it can be reproduced immediately after recording in a second time after erasure. Therefore, rewrite can be completed in two times of operations, and thereby, the efficiency of the data processing can be improved.

Waveguide-to-microstrip power splitter

Abstract: A novel coupling structure which permits both power combining and division is described. The structure divides power equally from a rectangular waveguide to two microstrip lines. The microstrips are T-shaped conductor patterns placed symmetrically in the waveguide. The splitter has a return loss of better than 20 dB from 3.3-4.6 GHz measured at the waveguide port. The power difference between the two microstrip output ports is less than 0.1 dB. The coupler is useful for power combining at microwave and millimeter-wave wavelengths with minimal power loss. >

Novel design of integrated optical beam splitters using symmetric Y-branch structures

Abstract: We propose a novel design and present a study of the operation of an integrated optical beam splitter using single-mode symmetric Y-branch structures. The phase-front accelerator (PFA) effect was employed so that asymmetric power division in the two output branches would be possible. The relationship between the power splitting ratio with respect to the axial displacement and the transverse tip offset of the PFA sector was investigated with the PFA refractive index as the parameter. The range of the power splitting ratio can be improved significantly if an asymmetric PFA sector is used instead of a symmetric PFA sector. In addition, the total power transmission of the beam splitter can be kept fairly constant over a wide range of power splitting ratios.

Optical disk medium

Abstract: PURPOSE:To secure a stable tracking action with no nonlinear disturbance of the tracking error signal caused by the recording of information onto an optical disk, by providing guides that change their reflection factors in different cycles at both sides of a recording track. CONSTITUTION:The laser light 1 delivered from a light source is condensed on the recording plane 6 of an optical disk 5 through a polarized beam splitter 2, a 1/4 wavelength plate 3 and a condenser lens 4. The disk 5 contains two guide parts 7 and 8 having different cycles and the reflection factors different from the plane 6 formed at both sides of an information recording track on the plane 6. The reflected light received from the plane 6 is irradiated on a photodetector 9 via the lens 4, the plate 3 and the splitter 2. The signals detected by the detector 9 in a revolution mode of the disk 5 contain two types of frequency components according to the changes of reflection factors of both parts 7 and 8. Then the position control is given to the lens 4 so as to secure a fixed ratio between both frequency components. In such a way, the condensed laser spot can be tracked at a fixed position between both parts 7 and 8.

Novel passive multibranch power splitters for integrated optics.

Abstract: The performance of passive dielectric optical waveguide multibranch power splitters, constructed with different architectures, is analyzed by using the beam propagation method. The principle underlying our configuration seems applicable to a higher-order splitter with an even number of branches.

Magneto-optical disk device

Abstract: PURPOSE:To efficiently obtain a high output power at the time of recording and to improve the regenerative signal quality by synthesizing a laser beam having the different wavelength and designing suitably the wavelength dependency of the transmissivity of a polarizing beam splitter. CONSTITUTION:The emitting beams of lasers 1 and 11 having the different wavelength are synthesized by an optical element 13 and made incident on an optical beam splitter 14. When the wavelengths of the lasers 1 and 11 are suitably set for the design wavelength of the splitter 14, the P polarizing face can obtain about 40% transmissivity, an S polarizing face can obtain 0% transmissivity to a laser 1 and can obtain about 100% transmissivity to a laser 11. Thus, at the time of recording or erasing, the lasers 1 and 11 are simultaneously driven and a large spot power synthesized on the face of a magneto- optical disk 10 is obtained. At the time of reproduction, only the laser 11 is driven and the reproduction is performed. Then, the high quality recording and reproducing can be efficiently performed.

Reflection type liquid crystal display element and projection type display device using the same

Abstract: PURPOSE: To divert a vertical component, on which is made incident when the element is off, from the optical path extending to a polarization beam splitter and to suppress a decrease in contrast by using a wedgelike type for an opposite insulation substrate which has a common electrode. CONSTITUTION: The light which is emitted by a light source 101, collimated by a collimator lens 102 into parallel luminous flux, and made incident on the polarization beam splitter 103 is deflected linearly, made incident on a reflection liquid crystal display element 104, and reflected while brightness- modulated at every picture element and the light passes through the splitter 103 and then passes through a projection lens 105 to form an image on a screen 106. The vertical component which enters the splitter 103 by the interface reflection between the opposite substrate surface and air which decreases the contrast of the image is put off the optical path by providing the wedgelike opposite transparent insulation plate 11a. The angle θ of the surface is set to 5 - 15° to increase the contrast by about 20%. COPYRIGHT: (C)1992,JPO&Japio

New TE/TM polarisation splitter made in Ti:LiNbO/sub 3/ using X-cut and Z-axis propagation

Abstract: A new TE/TM integrated polarisation splitter made on LiNbO/sub 3/ for an isotropic cut has been investigated. The principles of operation and measurement characteristics are presented. At 1.3 mu m wavelength, a polarisation extinction ratio of 25 dB has been obtained.

Polarization converter and splitter for a coherent receiver optical network on InP

Abstract: The key elements of a coherent optical receiver network using a polarization diversity scheme are summarized. The principles of operation and design of the elements for monolithic integration of the waveguide network are sketched and first results are presented.

Phase difference detector

Abstract: PURPOSE:To obtain extremely stable beat frequency by interposing an acousto- optical modulation element to one of two optical paths and forming frequency difference between the laser beams of two optical paths. CONSTITUTION:The linear polarized laser beam of single frequency from a laser beam source is split into an S-wave and a P-wave, both of which have planes of polarization crossing each other at a right angle, by a polarized beam splitter 12. For example, the plane of polarization of laser beam is rotated by 45 deg. with respect to the incident surface of the splitter 12. The P-wave transmitted through the splitter 12 is condensed to an object 16 to be measured by the first lens 14 and the transmitted P-wave is brought to parallel beam by the second lens 18 and reflected by a mirror 24 to reach a polarized beam splitter 28 through the first acousto-optical modulation element 26. This modulation element 26 is equipped with a light pervious substrate 30 and the ultrasonic oscillator 32 provided to the end part thereof and transmitted beam is deflected by diffraction action according to the cyclical refractive index change corresponding to the surface elastic wave generated from the oscillator 32 to shift frequency.

Optical disc playback system - has screening plate with needle aperture to control input to detector element

Abstract: An optical player for use with either video discs or digital audio discs has a light sourcea (1), beam splitter (2), disc (4), photo detector (5) and lens mounted in an actuator (6) Located between the splitter and the detector is a screening plate (9) with a small aperture (8) The system of the tight source splitter and lens provides the functional equivalent of a pair of lenses providing point source focussing The screening plate (9) with the small aperture provides blocking of components of the reflected tight general from the surface of the disc This prevents any cross talk between adjacent tracks on the disc A further version has a selection circuit coupled to the detector stage ADVANTAGE - Eliminates drop in signal level from disc

An optical interconnection arrangement

Abstract: An arrangement for butt coupling of waveguide electrooptic plates to form a crossbar switch. The arrangement includes a stack of M splitter plates, each of which routes an injected optical signal to one of N outputs, and a stack of N combiner plates, each of which routes the signal of a selected one of M inputs to a common output. The stack of splitter plates is rotated with respect to the stack of combiner plates and the output signal ports of the splitter plates are coupled to the input signal ports of the combiner plates, so that each output of an splitter plate is connected to a different combiner plate. Within each splitter plate there is a fan-out network of waveguide electrooptic couplers and each coupler, under electric control, routes signals from one input to either one of two outputs. With j levels of such interconnected couplers 2 j output are developed. The combiner plates have an identical architecture but with a signal flow in the reverse direction. Butt coupling of the splitter and combiner plates is achieved by employing splitter and combiner plates of a different crystal cut, by interposing polarization rotation means between the two stacks, or by including polarization rotation means within the splitter plates, the combiner plates, or both.

Distributed and lossy match active power splitters using bridged-T low-pass filter networks

Abstract: Wideband active power splitters using distributed or lossy match amplification have been design and fabricated in hybrid form. These splitters use a bridged-T low-pass filter network. It provides a variable characteristic impedance without affecting the cutoff frequency and thus is powerful in application to a multiway power splitting/combining circuit which requires high impedance characteristics. A two-way distributed active power splitter has achieved a gain of 1.8+or-0.8 dB and input-output VSWRs (voltage, standing wave ratios) of less than 2:1 over 0.5 to 26.5 GHz. A two-way lossy match active power splitter has shown a loss of 1.3+or-1.1 dB and input-output VSWRs of less than 2:1 across 0.5 to 26.5 GHz. >

Optical information reproducer

Abstract: PURPOSE: To accurately detect an information magnetic domain edge by combining, interfering and focusing a polarized component generated by the rotation of polarization of a reflected light generated by a magneto-optical recording film and a polarized component perpendicular thereto at a suitable optical amount ratio, and detecting it by using divided photodetectors. CONSTITUTION: An optical component (beam flux A) which passes a second polarizing beam splitter 8, passes a 1/2 wavelength plate 10 and reaches a neutral beam splitter 11 and an optical component (beam flux B) which passes an optical path compensation plate 10-2 and reaches the splitter 11 are superposed in the opposite phase on a photodetector 14-21 corresponding to a photodetector 14-11, and superposed in the same phase on a photodetector 14-22. Accordingly, they becomes a distribution of axial symmetry with respect to an optical axis, and a difference of the optical intensity distribution of the flux B including edge information at upper and lower positions through the optical axes thereof can be detected. Thus, edge detecting capacity can be improved. COPYRIGHT: (C)1992,JPO&Japio

Optical recording and reproducing device for information signal

Abstract: PURPOSE:To improve the simultaneous recording actions of plural information signals, etc., by reflecting and transmitting respective reflected lights from converged points generated by a laser light transmitted through a polarized beam splitter and the laser light reflected at the splitter at and through the polarized beam splitter, thereafter, converging the lights and giving them to photodetectors, respectively. CONSTITUTION:A reflected light Pl 2r from a converged point S2 generated by a laser light Pl 2 transmitted through a polarized beam splitter PBS provided in an optical system is reflected at the polarized beam splitter PBS, thereafter, converged by a collimator lens Lc1 and given to a photodetector PD2. A reflected light Pl 1r from a converged point S1 generated by a laser light Pl 1 reflected at the polarized beam splitter PBS is reflected at the polarized beam splitter PBS, thereafter, converged by a collimator lens Lc2 and given to a photodetector PD1. Thus, the action in the simultaneous recording action and reproducing action or both actions of plural information signals can be executed by one optical head.

Space light transmitter

Abstract: PURPOSE:To separate a transmission/reception light by a polarized beam splitter with almost no loss by providing a laser line rotating device having a lambda/2 wavelength plate correcting the polarized direction of a transmission/reception laser beam made incident/emitted into/from an optical antenna section. CONSTITUTION:A transmission light 21 is emitted from an optical transmitter 2, passes through a laser line rotating device 1 through a beam splitter 12 and emitted via a mirror angle drive mechanism 9 and an optical antenna section 11. Moreover, a received light 22 is made incident to the rotating device 1 via an optical antenna section 11 and the mechanism 9 and the direction of polarization is corrected in the rotating device 1 so as to be orthogonal to the polarization direction of the light 21. Then the corrected reception light is reflected in the splitter 12, branched by a beam splitter 13 and made incident in a transmitter/receiver 3 or the like. In this case, a lambda/2 wavelength plate 8 of the rotating device 1 is driven by a motor or the like and the polarized direction of the beam is set optionally, then the transmission light orthogonal to the received light sent from an opposite station is emitted to the opposite station. Thus, the separation of the transmission/reception light is attained by the polarized beam splitter with almost no loss.