Class / Patent application number | Description | Number of patent applications / Date published |
385140000 | Attenuator | 17 |
20080205845 | Variable Optical Attenuator - A variable optical attenuator is disclosed, which attenuates a beam of light while preserving its polarization substantially independent of wavelength. The beam of light is attenuated by a filter patterned with a grating of blocking stripes with serrated edges, which partially block and partially transmit the beam of light, respectively. The serrated edges provide for low polarization dependent loss. Along a length of the filter, a mark to space ratio of blocking stripe and aperture widths increases. By a linear translation of the filter along its length attenuation can be varied to a desired value. A stepper motor with lead screw can provide a suitable linear translation to give the filter a latching property. | 08-28-2008 |
20080232760 | SYSTEM AND METHOD FOR DETERMINING FIBER CHARACTERISTICS - A system is provided for characterizing optical fibers carrying signal traffic. The system includes a transmitter, a variable optical attenuator (VOA), a receiver, and a computing device. The transmitter propagates an optical test signal along a channel of a fiber pathway. The VOA adjusts the attenuation of the optical test signal from an initial, greater attenuation to a subsequent, lesser attenuation. At the same time, the computing device monitors at least one other channel of the fiber pathway and identifies effects upon the other channel(s) from the optical test signal. The computing device may communicate with the VOA and with other components of the fiber pathway to direct adjustment of the signal strength. A maximum optical test signal strength may thus be achieved that does not negatively affect signal traffic on the other channels, and the fiber pathway may subsequently be tested using the achieved maximum optical test signal strength. | 09-25-2008 |
20080253731 | Variable optical attenuator - A variable optical attenuator with photoelectric detector, comprising a collimator, a variable optical attenuator chip, wherein the variable optical attenuator further comprises a photoelectric detector; and the photoelectric detector receives and detects partial light from the variable optical attenuator chip. The variable optical attenuator of the invention is capable of detecting attenuation change of itself via the variable optical attenuator chip. Thus, real-time monitoring and feedback are implemented, and the attenuation performance of the variable optical attenuator is improved. | 10-16-2008 |
20090103883 | OPTICAL ATTENUATOR - In an optical attenuator, there are a first optical waveguide | 04-23-2009 |
20090162022 | OPTICAL TRANSMISSION APPARATUS AND METHOD FOR CONTROLLING VARIABLE OPTICAL ATTENUATOR - An optical transmission apparatus including a variable optical attenuator is provided. The optical transmission apparatus includes a module detection portion for detecting a type of module that receives light attenuated by the variable optical attenuator; and a variable optical attenuator control portion for controlling so as to change control parameters of the variable optical attenuator in accordance with the type of module detected by the module detection portion. | 06-25-2009 |
20100003003 | OPTICAL ATTENUATOR - A tilting mirror MEMS variable optical attenuator attenuates light over a band of wavelengths with minimum wavelength dependent loss. The attenuator includes a lens that has a wedged input face and is made from a material that has high dispersion. The lens design causes different wavelengths to travel different paths through the attenuator such that wavelength dependent loss is reduced. The attenuator may be designed to have minimum wavelength dependent loss at a specified attenuation greater than zero. | 01-07-2010 |
20100158468 | Sunlight Simulator Apparatus - Sunlight simulators that have optical homogenizer units that provide adjustably positionable beams of radiation, each within a selected portion of the spectrum of wave lengths of radiation emitted from a light source, that have uniform output intensity profiles measured across the ends of the optical homogenizer units. These sunlight simulators include either liquid light guides or fiber optic light guides that conduct the beams of radiation, developed from the light source, to the optical homogenizer units. Dosage regulating means control the doses of radiation provided by the optical homogenizer units. | 06-24-2010 |
20100178023 | OPTICAL INTERFACE DEVICE - An optical interface device comprises an optical fuse and an optical attenuator in this order along an optical transmission path. | 07-15-2010 |
20100189405 | Optical Loss Device - An optical loss device including an optical fiber is disclosed which is characterized in that the optical loss device includes a loop portion formed by winding the optical fiber in a loop shape at least one turn, and two rotation centers that are located in a plane defined by the loop portion and that face each other, the two rotation centers forming a rotation axis located in the plane, and which is characterized in that a light of wavelength band is attenuated by twisting the loop portion around the rotation axis to vary a shape of the loop portion. | 07-29-2010 |
20110091181 | Coated Optical Fibers and Related Apparatuses, Links, and Methods for Providing Optical Attenuation - Coated optical fibers and related apparatuses, links, and methods for optically attenuating light directed to or from optical fibers are disclosed. In one embodiment, an optical fiber includes an optical fiber end. The optical fiber end may be a source end and/or a detector end, and may be angle-cleaved. A coating material is disposed on at least a portion of the optical fiber end and configured to optically attenuate a portion of light directed to the optical fiber end. The material type of the coating material and/or the thickness of the coating material may be selectively controlled to control the amount of optical attenuation. The thickness of the coating material may also be controlled to provide the desired thickness of coating material onto at least a portion of the optical fiber end. The coating material may also be selectively patterned to improve the bandwidth of a multi-mode optical link. | 04-21-2011 |
20110217018 | COMPACT THERMAL ACTUATED VARIABLE OPTICAL ATTENUATOR - A MEMS variable optical attenuator (VOA) chip includes a frame having a planar surface, a micro-electric actuator with a movable optical shutter arranged with respect to the planar surface of the frame, where the VOA is actuated by thermal expansion. The micro-electric actuator comprises semiconductor conductors (“wires”) that can be moved, upon applying an electrical current, by thermal expansion. In one embodiment, the MEMS VOA chip is configured in a multiple wire arrangement that restricts the shutter movement in a plane. | 09-08-2011 |
20120027370 | OPTICAL DEVICE - An embodiment of the invention relates to an optical device ( | 02-02-2012 |
20130077930 | OPTICAL FIBER ATTENUATOR - An optical fiber attenuator includes a connector unit, an insert component and an attenuation unit. The connector unit includes a shell member and having a first shell part, and a second shell part that extends from and forms a unitary body with the first shell part, that reduces in cross-section with respect to the first shell part, and that cooperates with the first shell part to define a through hole. A resilient portion is connected to and extends inclinedly and outwardly away from the second shell part and towards the first shell part. The insert component includes an insert body disposed in the through hole, and a trench formed in the insert body. The attenuation unit has one end inserted into the trench and another end inserted into the second shell part. | 03-28-2013 |
20130216197 | VARIABLE OPTICAL ATTENUATOR - In one embodiment, a variable optical attenuator includes a core configured to propagate optical data signals and a cladding surrounding at least part of the core and comprising a first cladding portion and a second cladding portion. An attenuating spacer between the first cladding portion and the second cladding portion is formed from a smart material. The smart material is configured to apply a force to at least one of the first cladding portion and the second cladding portion in response to an external stimulus. The smart material may be a piezoelectric material and the external stimulus may be an electrical current. | 08-22-2013 |
20130259439 | OPTICAL DEVICE - An optical device includes: a first lens; a second lens that is arranged behind a focal point of the first lens and is optically connected to the first lens; an optical attenuator that is arranged on an optical path between the first lens and the second lens and changes passage amount of an inputting light. | 10-03-2013 |
20140086547 | DYNAMIC OPTICAL CIRCULATOR DEVICE - A dynamic optical circulator device applicable to UPC-type and PC-type optical connectors is provided, including a first UPC/PC-type optical connector, a second UPC/PC-type optical connector, a third UPC/PC-type optical connector, a passive optical circulator, a reflected light detector and a transform element. The first, second and third UPC/PC-type optical connectors provide connections to optical fibers for receiving and transmitting optical signals. The first UPC/PC-type optical connector, the second UPC/PC-type optical connector and the third UPC/PC-type optical connector are connected to the three ports of the passive optical circulator, respectively, with the reflected light detector placed between the second UPC/PC-type optical connector and the second port of the passive optical circulator, while the transform element can be placed between any port of passive optical circulator and corresponding UPC-type and PC-type optical port. | 03-27-2014 |
20140328567 | WAVEGUIDE FEEDTHROUGH FOR BROADBAND ELECTROMAGNETIC WAVE ATTENUATION - A waveguide feedthrough for broadband electromagnetic wave attenuation is provided in an electromagnetic wave shielding structure, in which data processing and communication devices are installed, so that a plurality of optical cables or the like which are connected to data processing and communication devices are led into the electromagnetic wave shielding structure through the waveguide feedthrough. Thereby, broadband electromagnetic waves generated from external other devices can be prevented from entering the electromagnetic wave shielding structure. For this, the waveguide feedthrough includes a waveguide feedthrough body which is made of conductive material and has a through hole therein, and an electromagnetic wave absorber which is provided on an inner side surface of the through hole. | 11-06-2014 |