摘要:
An apparatus for measuring ganglion cells may include: a light generation unit configured to irradiate a first light signal polarized in a first direction and a second light signal polarized in a second direction perpendicular to the first direction to a subject; a reflected light processing unit configured to generate an amplification signal corresponding to an image of the subject using a first reflection signal, which is the first light signal reflected from the subject, and a second reflection signal, which is the second light signal reflected from the subject; and an image processing unit configured to measure ganglion cells in the subject using the amplification signal. The apparatus may be used to count the number of normal ganglion cells in the retina by measuring a phase difference of two lights polarized in different directions. The apparatus may also be used to monitor the progress of glaucoma.
摘要:
The present invention relates to a method of embodying all-optical XOR logic gate by using semiconductor optical amplifier, and more particularly, to a technique to embody all-optical XOR logic gate utilizing the cross-gain modulation (XGM) characteristic of semiconductor optical amplifiers controllable with input currents, illumination signal, and pumping signal.The method of all-optical XOR logic element in accordance with the present invention is characterized to obtain operational characteristic of the all-optical XOR logic element by inputting pump-signal and illumination signal concurrently into two semiconductor optical amplifiers and then summing the two output signals having XGM characteristic arising from gain saturation and wavelength conversion of the semiconductor optical amplifiers.
摘要:
The present invention relates to an implementation method of all-optical half adder by using semiconductor optical amplifier(SOA)-based devices and the apparatus thereof. In more detail, it relates to an implementation method of all-optical half adder comprising an all-optical XOR gate and an all-optical AND gate, implemented by using SOA-based devices, and an apparatus thereof.
摘要:
The present invention relates to a terahertz wave generator and a method of generating high-power terahertz waves using the terahertz wave generator. The terahertz wave generator includes a hollow spherical body, and a focusing lens installed in a cutout portion of the spherical body or an opening formed in the cutout portion, wherein an inner surface of the spherical body is coated with metal. In the method, frequencies having different levels are incident through the focusing lens or the opening to generate a plurality of air plasmas, and the air plasmas cause continuous focusing the metal-coated inner surface and hollow space of the spherical body, thus generating high-power terahertz waves. According to the present invention, a plurality of air plasmas is continuously generated, thus solving the problem in which the light intensity of terahertz waves generated using one air plasma is low.
摘要:
The present invention relates to an apparatus and a method for realizing all-optical NOR logic device using the gain saturation characteristics of a semiconductor optical amplifier(SOA). More particularly, the invention relates to a 10 Gbit/s all-optical NOR logic device among all-optical logic devices, in which a signal transmitted from a given point of an optical circuit such as an optical computing circuit is used as a pump signal and a probe signal.The method for realizing an all-optical NOR logic device using the gain saturation characteristics of the SOA according to the present invention comprises the steps of: utilizing A+B signal which couples together an input signal pattern A (1100) and an input signal pattern B (0110) as a pump signal (1110); utilizing a probe signal (1111) by generating a clock signal out of said input signal pattern A (1100); and obtaining a Boolean equation {overscore (A+B)} by making said probe signal and said pump signal incident upon the SOA simultaneously from the opposite direction.The all-optical logic device according to the present invention has a simple construction since it is realized through the XGM (Cross Gain Modulation) method which utilizes the gain saturation characteristics. Also, it is expected that the method employed in the present invention could be used for realizing other all-optical logic circuits and devices.
摘要:
The present invention is related to an all-optical OR device embodied by using the gain saturation and wavelength conversion characteristics of semiconductor optical amplifier (SOA), and more particularly, to a technique to embody an all-optical OR gate that performs all-optical logic operation by utilizing optical signals transmitted at arbitrary points of optical circuits such as optical computing circuits as the pump signal and the probe signal.
摘要:
The present invention relates to the all-optical logic AND operation in a SOA (semiconductor optical amplifier)-based Mach-Zehnder interferometer. More particularly, it relates to the technology making feasible ultra high-speed logic operations while maintaining a small size and a low input power by utilizing a cross-phase modulation (XPM) wavelength converter composed of semiconductor optical amplifiers in the form of a Mach-Zehnder interferometer with nonlinear characteristics.
摘要:
Disclosed herein is an apparatus and method for implementing an all-optical OR logic gate. The apparatus includes an optical pulse generator, a Mode-Locked Fiber Laser (MLFL), a first optical splitter, a first optical delay line means, an optical control means, a first optical coupler, a second optical splitter, a second optical delay line means, a third optical splitter, an Erbium Doped Fiber Amplifier (EDFA), a Semiconductor Optical Amplifier (SOA), a second optical coupler, and an optical analyzer. The first optical splitter divides light output from the MLFL. The first and second optical delay line means acquire time delay. The optical control means controls intensity and polarization of the light. The first optical coupler generates the first input signal pattern as a probe signal. The second optical splitter divides light output from the first optical coupler. The third optical splitter divides the second input signal pattern. The EDFA amplifies the divided part of the second input signal pattern as a pump signal. The SOA couples the pump signal with the probe signal in opposite directions to perform the all-optical OR logic operation. The second optical coupler couples a signal output from the SOA with the second input signal pattern.
摘要:
Provided are a method of controlling an amount of adsorbed carbon nanotubes (CNTs) and a method of fabricating a CNT device. The method of controlling an amount of adsorbed CNTs includes adsorbing CNT particles onto a semiconductor structure, and removing some of the adsorbed CNTs by performing an oxygen plasma treatment on the adsorbed CNT particles.
摘要:
An apparatus and method for realizing an all-optical NOR logic device includes a distributed feedback laser diode and a tunable laser diode respectively generating two pump signals of different wavelengths. The apparatus also includes a pulse generator and a Mach-Zehnder modulator modulating the pump signals. The apparatus also includes a delay line adapted to delay a pump signal that has been split from the modulated pump signals and that travels along one optical path, and a polarization controller and an optical attenuator adapted to control another pump signal that has been split from the modulated pump signals and that travels along another optical path, to have the same polarization and intensity as those of the pump signal passing through the delay line. An Er-doped amplifier amplifies the sum of the pump signals so that the amplified pump signal sum saturates a semiconductor optical amplifier. The semiconductor optical amplifier exhibits gain saturation and wavelength conversion characteristics in response to an output signal from the Er-doped fiber amplifier and a probe signal passing therethrough. A plurality of 50:50 fiber couplers are coupled to respective output ends of the laser diodes, the Mach-Zehnder modulator, the attenuator, and the Er-doped fiber amplifier in order to conduct coupling and splitting operations for the pump signals.