| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 141 | OPTICAL OUTPUT CONTROLLER AND ITS CONTROL METHOD | US12532018 | 2008-03-10 | US20100103503A1 | 2010-04-29 | Shuji Inoue; Hiroshi Mitani |
| An optical output controller includes a wavelength conversion device operable to change the wavelength of pumped laser light; a heating/cooling unit operable to control the temperature of the wavelength conversion device; a temperature detector which detects the temperature of the wavelength conversion device; a temperature controller operable to control the heating/cooling unit such that the detected temperature corresponds to a target temperature; an optical output detector operable to detect the optical output from the wavelength conversion device; an optical-output maximization controller operable to determine a temperature at which the optical output is maximized according to the optical output detected by the optical output detector and from the detected temperature detected by the temperature detector and, further, outputs the temperature difference between the determined temperature and the detected temperature; and an adder which adds the temperature difference outputted from the optical-output maximization controller to the target temperature; wherein the temperature difference is added to the target temperature to correct the target temperature for maximizing the optical output. | ||||||
| 142 | DEMODULATOR | US12571787 | 2009-10-01 | US20100085630A1 | 2010-04-08 | Takashi SHIMIZU; Koji Terada; Tsuyoshi Yamamoto |
| A demodulator and method are provided. The demodulator for demodulating an optical signal, includes a splitter that splits a differential phase modulation signal into a first split light component and a second split light component, couples the first split light component to a first optical path and the second split light component to a second optical path, a first medium disposed on the first optical path, a second medium disposed on the second optical path and having a refractive index different from that of the first medium, and a combiner that combines the first split light component that has passed through the first medium and the second split light component that has passed through the second medium, wherein one of the first split light component and the second split light component is delayed in relation to the other. | ||||||
| 143 | OPTICAL DEVICE | US12555404 | 2009-09-08 | US20100027935A1 | 2010-02-04 | Takashi SHIRAISHI |
| The optical device includes a substrate having an electrooptic effect; a plurality of optical waveguides formed in the substrate in parallel to one another; and a polarization inversion region which is disposed a part of the substrate and which has a polarization characteristic that is an inverse to that of the substrate, wherein a profile of a boundary between the polarization inversion region and a remaining region in which the polarization is not inverted is configured such that accumulated amounts of distortion that affects the respective waveguides over coordinates along a light propagation direction are substantially identical. | ||||||
| 144 | Tunable Optical Filter and Method of Manufacture Thereof | US12184192 | 2008-07-31 | US20100027096A1 | 2010-02-04 | Jing Jong Pan |
| A tunable optical filter is formed in the structure of an etalon. A thin electro-optic ceramic substrate is fixed between two end substrates. Each end substrate has an inner parallel surface toward said electro-optic ceramic substrate covered by an electrode layer and a reflecting layer. An adhesive which attaches the electro-optic ceramic substrate to each first and second end substrates has a consistency so as to avoid stress on the electro-optic ceramic substrate. A voltage imposed on the electro-optic ceramic substrate by the electrode layers on the inner parallel surfaces of the first and second end substrates effectively controls an optical distance between the reflective coating layers on the inner parallel surfaces of the first and second end substrates of the etalon structure. The electro-optic ceramic substrate is preferably PMN-PT ((1-x)Pb(Mg⅓Nb⅔)O3-x—Pb Ti O3) and no more than 160 μm thick. | ||||||
| 145 | Quadrature phase-shift keying modulator and phase shift amount controlling method for the same | US12234931 | 2008-09-22 | US07603007B2 | 2009-10-13 | Takafumi Terahara; Takeshi Hoshida; Kentaro Nakamura; Yuichi Akiyama; Hiroki Ooi; Jens C. Rasmussen; Akira Miura |
| The improved quadrature phase shift keying modulator has a structure such that the average light output power of phase-shift keying modulation light output from the combining unit is changed according to the phase difference between the first and the second optical signal after being combined by means of applying driving signals different in eye crossing percentage by the first modulator and the second modulator, respectively, and has a power monitor monitoring the average light output power of quadrature phase-shift keying modulated light and a phase shift controlling unit which performs feedback control of the phase shift amount in the phase shifting unit based on the average light output power monitored by the power monitor. | ||||||
| 146 | Optical reception apparatus compatible with DQPSK polarization multiplexing format | US12232607 | 2008-09-19 | US20090196610A1 | 2009-08-06 | Akihiko Isomura; Jens Rasmussen |
| In the optical reception apparatus, a DQPSK polarization multiplexed signal light (S) input thereto is split into horizontally/vertically polarized signal lights (SH, SV) by a polarization beam splitter (3), and the signal lights (SH, SV) each is branched into two by each of optical couplers (4H, 4V). Then, one branched lights (SH1, SV1) by each of the optical couplers (4H, 4V) are supplied to a delay interferometer (5I) on the I branch via optical circulators (10I1, 10I2) to be propagated in bidirectional, and the other branched lights (SHQ, SVQ) by each of the optical couplers (4H, 4V) are supplied to a delay interferometer (5Q) on the Q branch side via optical circulators (10Q1, 10Q2) to be propagated in bidirectional, so that a set of delay interferometers (5I, 5Q) is commonly used for horizontally polarized waves and vertically polarized waves. | ||||||
| 147 | OPTICAL MODULATORS | US12260276 | 2008-10-29 | US20090142015A1 | 2009-06-04 | Akiyoshi Ide; Jungo Kondo; Osamu Mitomi; Yasunori Iwasaki; Hiroki Kobayashi |
| An optical modulator 20 has an optical waveguide substrate 1 having a pair of principal surfaces 1a, 1c, a pair of side surfaces 1b and an incident face 1d and exit face 1e of light, the substrate being composed of a ferroelectric material; a channel optical waveguide 4 having at least a pair of branch sections 4b, a multiplexing section 6 of the branch sections and an exit section 4c provided on the downstream of the multiplexing section, the waveguide being formed on the principal surface 1a; a modulation electrode 2, 3 for applying a signal voltage for modulating light propagating in the branch sections; and a reflective groove 7 for reflecting leaked light of off-mode emitted from the multiplexing section 6 and emitting the light from the one principal surface 1a. An operating point of the optical modulator is controlled by changing a DC bias applied on the modulation electrode based on optical output of the leaked light of off-mode. | ||||||
| 148 | Light Modulator and Its Fabrication Method | US11992866 | 2006-09-27 | US20090129718A1 | 2009-05-21 | Takashi Shinriki; Katsutoshi Kondou; Tsutomu Saitou |
| It is an object of the invention to provide a light modulator using a thin plate having a thickness of 20 μm or less and capable of stably holding a conductive film suppressing troubles such as resonance phenomenon of microwaves in a substrate and pyro-electric phenomenon and to provide a method of fabricating the light modulator. The light modulator includes: a thin plate (10) formed of a material having an electro-optic effect and having a thickness of 20 μm or less; a light waveguide (11) formed on the front or rear surface of the thin plate; and modulation electrodes (13, 14) formed on the front surface of the thin plate to modulate light passing through the light waveguide. The light modulator further includes a reinforcing plate (16) bonded to the rear surface of the thin plate and a conductive film (17) continuously formed in the range from the side surface of the thin plate to the side surface of the reinforcing plate. | ||||||
| 149 | Optical modulator and optical transmitter | US12155120 | 2008-05-29 | US20090067852A1 | 2009-03-12 | Masaki Sugiyama |
| A reduction in size and cost of an optical modulator is achieved with a simple configuration, while improving the modulation characteristics. An optical modulator modulates light branched by an optical coupler and then couples the light via the optical coupler. The optical coupler is formed in a substrate having electro-optic effects. An optical waveguide is formed in the substrate and, includes a turnback section and ends into which the light branched by the optical coupler is input. A signal electrode is provided in the substrate along the optical waveguide. A modulation signal to modulate the light passing through the optical waveguide is input to the signal electrode. | ||||||
| 150 | Conversion efficiency expansion in wavelength converting optical packages | US11880231 | 2007-07-20 | US20090022182A1 | 2009-01-22 | Jacques Gollier |
| Particular embodiments of the present invention relate generally to altering the effective conversion efficiency curve of an optical package employing a semiconductor laser and an SHG crystal or other type of wavelength conversion device. For example, according to one embodiment of the present invention, a method of controlling an optical package is provided where the optical package is tuned such that ascending portions of a transmission curve representing a spectral filter are aligned with descending portions of a conversion efficiency curve representing a wavelength conversion device. With the filter and wavelength conversion device so aligned, the optical package is further tuned such that the wavelength of the fundamental laser signal lies within a wavelength range corresponding to aligned portions of the ascending and descending portions of the transmission and conversion efficiency curves. Additional embodiments are disclosed and claimed. | ||||||
| 151 | Dynamic optical phase shifter compensator | US10556308 | 2004-05-09 | US07435939B2 | 2008-10-14 | SeongWoo Suh; Yossi Corem |
| A birefringent, electrically-controlled, wavelength selective, pixelated optical phase shifting device, in which the correct drive voltage for a desired phase shift through any pixel can be determined independently of changes in the drive voltage arising from changes in the environmental conditions, generally temperature. This is achieved by mounting a monitor phase shifting element controlled by its own drive voltage, in close proximity to the pixelated phase shifter, such that the monitor element and the phase shifter experience the same environmental condition. A probe optical beam of predefined wavelength is directed through the monitor element, and the transmitted beam measured as a function of the monitor drive voltage. This functional relationship is used to define the environmental condition in which the monitor element and the phase shifter, are situated, and the correct drive voltage for application to any phase shifter pixel can be determined. | ||||||
| 152 | Semiconductor electro-absorption optical modulator, semiconductor electro-absorption optical modulator integrated laser, optical transmitter module and optical module | US11019370 | 2004-12-23 | US07409113B2 | 2008-08-05 | Seiji Sumi; Kazuhisa Uomi; Hiroyuki Kamiyama; Kazuhiko Naoe |
| This invention provides an optical transmitter module and an optical module using an EA modulator capable of realizing stable ACER regardless of operating temperature without using a control mechanism for maintaining temperature of the EA modulator constant. In the EA modulator, optical waveguides formed of a multi-layered film are formed on a substrate, an electrical signal is applied to the optical waveguides in a direction vertical to the substrate, and the input light absorption amount is changed to control the amount of output light. Also, a plurality of p-side electrodes electrically separated from each other for applying an electrical signal to the active layer optical waveguides are arranged on optical axes of active layer optical waveguides. The length of optical waveguides to which the electrical signal is applied is changed by controlling the number of p-side electrodes to which the electrical signal is applied in accordance with temperature. | ||||||
| 153 | Software-based electro-optic modulator bias control systems and methods | US11656700 | 2007-01-23 | US20080175598A1 | 2008-07-24 | Steven S. Cho; Cecil D. Smith |
| The present invention provides a software-based electro-optic modulator bias control system resident in an optical transceiver including an electro-optic modulator that includes an optical-to-electrical converter including a transimpedance amplifier, an analog-to-digital converter, and a software algorithm, wherein the software algorithm is operable for determining an optimum bias voltage applied to the electro-optic modulator by discovering a maximum average optical power transmitted by the electro-optic modulator, or quadrature point, wherein the quadrature point is discovered by determining at what bias voltage the slope of an average optical power transmitted by the electro-optic modulator, defined as an optical power change given an incremental bias voltage change, is equal to zero. The software-based electro-optic modulator bias control system also includes a control loop operable for determining if a radio frequency port of the electro-optic modulator is driven to a peak-to-peak voltage that is greater than (over-driven) or less than (under-driven) the peak-to-trough voltage of a response curve of the electro-optic modulator. | ||||||
| 154 | Optical waveguide modulator with output light monitor | US11633777 | 2006-12-04 | US07359581B2 | 2008-04-15 | Norikazu Miyazaki; Tokutaka Hara |
| An optical waveguide monitor equipped with an output light monitor having a decreased restriction in the dimensions and form thereof, a high reliability and a low production cost includes an optical waveguide element (having a plurality of surface waveguide portions, a connecting portion for converging and connecting the surface waveguide portions and an output light-outputting waveguide portion connected to the connecting portion each formed on a dielectric substrate plate; an output light optical fiber connected to an output end of the output light-outputting waveguide portion, a reinforcing capillary for reinforcing a connection between the optical waveguide element and the output light optical fiber and a monitoring light receiving means, wherein the reinforcing capillary has a hole or groove for containing and supporting the output light optical fiber therein, a connecting face thereof bonded to an output end face of the substrate, and a terminal surface opposite to the connecting face, to thereby enable at least one member of the reinforcing capillary per se and a monitoring light optical fiber located within the capillary to receive the monitoring light outputted from the optical waveguide element, to transmit it therethrough and to output it to the outside of the capillary, and the monitoring light receiving means is located in a position suitable to receive the monitoring light outputted to the outside of the reinforcing capillary and has a photoelectric conversion element. | ||||||
| 155 | Low bias drift modulator with buffer layer | US11625535 | 2007-01-22 | US07343055B2 | 2008-03-11 | Gregory J. McBrien; Karl Kissa; Glen Drake; Kate Versprille |
| The invention relates to an electro-optic modulator structure containing an additional set of bias electrodes buried within the device for applying bias to set the operating point. Thus the RF electrodes used to modulate incoming optical signals can be operated with zero DC bias, reducing electrode corrosion by galvanic and other effects that can be present in non-hermetic packages. The buried bias electrodes are also advantageous in controlling charge build-up with consequent improvement in drift characteristics. The bias electrode material is useful for routing bias signals inside the device, in particular to external terminals, as well as forming encapsulating layers to permit operation in non-hermetic environments, thereby lowering manufacturing costs. Embodiments using both X-cut and Z-cut lithium niobate (LiNbO3) are presented. For the latter, the bias electrodes can be split along their axis to avoid optical losses. | ||||||
| 156 | Pilot tone bias control | US11437907 | 2006-05-19 | US20070269222A1 | 2007-11-22 | Siegfried Karl Gronbach |
| A method and apparatus for dynamically compensating for phase deviations using two synchronous rectifiers in a quadrature constellation and a delay line. | ||||||
| 157 | Dynamic optical phase shifter compensator | US10556308 | 2004-05-09 | US20070146863A1 | 2007-06-28 | SeongWoo Suh; Yossi Corem |
| A birefringent, electrically-controlled, wavelength selective, pixelated optical phase shifting device, in which the correct drive voltage for a desired phase shift through any pixel can be determined independently of changes in the drive voltage arising from changes in the environmental conditions, generally temperature. This is achieved by mounting a monitor phase shifting element controlled by its own drive voltage, in close proximity to the pixelated phase shifter, such that the monitor element and the phase shifter experience the same environmental condition. A probe optical beam of predefined wavelength is directed through the monitor element, and the transmitted beam measured as a function of the monitor drive voltage. This functional relationship is used to define the environmental condition in which the monitor element and the phase shifter, are situated, and the correct drive voltage for application to any phase shifter pixel can be determined. | ||||||
| 158 | Pockels cell | US10523282 | 2003-12-18 | US07236287B2 | 2007-06-26 | Stefan Balle; Sven Poggel; Thomas Fehn |
| The invention relates to a pockels cell comprising two spaced-apart cubical RTP crystals that have a square cross section, are located one behind another, and are oriented towards each other so as to provide thermal compensation in the direction of radiation. Each of said RTP crystals is provided with electrodes on two opposite faces, said faces of one crystal being rotated by 90° relative to the faces of the other crystal and relative to the direction of radiation (5). Flexible, electrically insulating, high voltage-proof plastic mats which conduct heat well and rest against the inside of a cooling member are provided around the exterior faces of the electrodes. | ||||||
| 159 | Electro-optic waveguide device capable of suppressing bias point DC drift and thermal bias point shift | US11131634 | 2005-05-18 | US07231101B2 | 2007-06-12 | Hirotoshi Nagata |
| The present invention discloses an electro-optic waveguide device such as a modulator. The device has an electro-optic substrate having optical waveguides within the substrate at or near an upper surface. A buffer layer is formed on the top surface of the electro-optic substrate. A novel block layer is formed on the buffer layer surface, which can suppress or lessen an unwanted occurrence of chemical reactions at or near the surface of the buffer layer. A charge bleed off layer is formed on the block layer, which has a certain amount of electrical conductivity to bleed off any electrical charges generated on or in the electro-optic waveguide device. Electrodes are on the charge bleed off layer, which can provide electrical signals to the optical waveguides through the buffer layer, the block layer, and the charge bleed off layer. | ||||||
| 160 | Environmentally stable electro-optic device and method for making same | US11286082 | 2005-11-23 | US07228046B1 | 2007-06-05 | Loren M. Hendry; Jeffrey E. Lewis; Jason C. Grooms; Charles B. Gray |
| A method is provided for stabilizing an electro-optic substrate employed in a waveguide device. The method comprises cleaning a surface of the substrate, and exposing the device to a reactive oxide to passivate the surface. A layer of sealant is deposited on the substrate in a vacuum to seal the surface. | ||||||
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