Abstract:
A micro-lens array is provided. The micro-lens array includes a transparent substrate, a plurality of polarizers disposed on the transparent substrate, a passivation layer covering the plurality of polarizers, and a plurality of micro-lenses disposed on the passivation layer, wherein light reflected to an object passes through the transparent substrate, and then, is polarized based on a plurality of different polarization orientations formed by the plurality of polarizers and is incident on the plurality of micro-lenses.
Abstract:
Provided are an apparatus and method for adjusting an optical axis. In the apparatus, an iris diaphragm and a quadrant photodiode (QPD) are used to align optical axes of an optical system of the apparatus so that optical transmission efficiency between an optical transmitter and an optical receiver can be increased. Since a hole of the iris diaphragm can be adjusted to be small, a beam larger than a light-receiving area of the QPD can be included in the light-receiving area, and optical axis alignment is facilitated accordingly. When the QPD and the iris diaphragm are applied to the apparatus, it is possible to simultaneously perform data transmission, tracking, and optical axis alignment. An optical fiber end surface and optical axes of lenses arranged in parallel are aligned in the apparatus so that alignment between two terminals can be easy and reception efficiency can be increased.
Abstract:
A hologram image acquiring apparatus may include: a linear polarizer that filters incident light reflected by an object into a polarized component of a specific angle; a spherical lens that partially converts light that is incident through the linear polarizer to a spherical waveform; and a phase shifter that converts a part of the light incident through the spherical lens to a plane waveform having a different phase per pixel unit.
Abstract:
An imaging sensor includes at least one fiber Bragg grating for filtering an image from a subject for wavelength bands, and an imaging device for converting an image transmitted through the fiber Bragg grating into a digital signal.
Abstract:
Disclosed are a method and apparatus for updating a terminal software version. The method includes providing software update start information including window size information and software image storage space information to a plurality of terminals, receiving first response information in accordance with provision of the software update start information from the plurality of terminals, and providing software update information in accordance with the window size information to the plurality of terminals in units of sections.
Abstract:
An optical network system for controlling a passive optical network (PON) in which at least one symmetric optical subscriber terminal and at least one asymmetric optical subscriber terminal coexist is provided.
Abstract:
An apparatus and method for monitoring an optical line is provided. The optical line monitoring apparatus may include a comparison unit to extract first identification information about an optical network terminal (ONT) from reflected data that is reflected and received from the optical line, and to compare the extracted first identification information to predetermined second identification information about the ONT, and a processor to analyze a state of the optical line using the reflected data when the first identification information is identical to the second identification information.
Abstract:
The present disclosure can effectively improve an angular image resolution and a spatial image resolution compared to the related art by solving a problem of a plenoptic image based on a microlens array according to the related art. In the case of the microlens array according to the related art, microlenses having different numerical apertures (NAs) and F # (F numbers) or focal lengths are positioned on one substrate. However, in the present disclosure, two or more microlens arrays having different NAs and F # are stacked in a layer form (all the microlenses of each microlens array are formed in the same F # and the same NA) to allow various F # and various NAs to be implemented, and thus an image of an object is formed on a sensor plane at different positions. Accordingly, a spatial resolution and a depth resolution increase.
Abstract:
A wireless optical communication apparatus for performing bi-directional optical transmission in a free space includes a first optical system configured to transmit data through a downlink scheme and a second optical system configured to receive the data from the first optical system and transmit a control signal to the first optical system through an uplink scheme, wherein each of the first optical system and the second optical system transmits and receives the data and the control signal through a single port.
Abstract:
There are provided a method for setting a sensor node and setting security in a sensor network, and a sensor network system including the same. A setting apparatus scans a near field communication apparatus included in the sensor node to obtain information on the sensor node. The information on the sensor node is transmitted to a gateway, and the gateway connects the sensor node to the sensor network using the received information on the sensor node.