Tokyo, Japan
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Patent
Nippon Telegraph, Telephone and NTT Electronics | Date: 2017-03-01

A video coding apparatus comprises a motion prediction unit configured to perform motion prediction for a plurality of coding unit sizes of an original image serving as the picture of an input video signal and evaluate results obtained by the motion prediction for the coding unit sizes so as to supply a first evaluation value; a merge mode evaluation unit configured to evaluate each of merge candidates on a coding unit of the merge size determined by a merge size determination unit so as to supply a second evaluation value of each of the merge candidates; and an inter-prediction mode determination unit configured to determine a mode used for coding on the basis of the second evaluation value obtained by the merge mode evaluation unit and the first evaluation value of the coding unit sizes.


Patent
Nippon Telegraph, Telephone and NTT Electronics | Date: 2017-02-15

A light modulation device detects a power of the modulated optical signal modulated by each of an I-component optical modulator and a Q-component optical modulator, synchronously-detects a component of a frequency fd from the power of the modulated optical signal, outputs a dither signal of a frequency fd/n (where n is a positive integer equal to or larger than 1) applied to a first bias voltage or a second bias voltage when adjusting the first bias voltage or the second bias voltage, outputs two dither signals having a frequency fd/m (where m is a positive integer equal to or larger than 1, where n


Patent
Nippon Telegraph, Telephone and NTT Electronics | Date: 2016-08-29

A video coding apparatus comprises a motion prediction unit configured to perform motion prediction for a plurality of coding unit sizes of an original image serving as the picture of an input video signal and evaluate results obtained by the motion prediction for the coding unit sizes so as to supply a first evaluation value; a merge mode evaluation unit configured to evaluate each of merge candidates on a coding unit of the merge size determined by a merge size determination unit so as to supply a second evaluation value of each of the merge candidates; and an inter-prediction mode determination unit configured to determine a mode used for coding on the basis of the second evaluation value obtained by the merge mode evaluation unit and the first evaluation value of the coding unit sizes.


Patent
NTT Electronics | Date: 2017-02-22

A technique that does not increase the circuit size, does not make the circuit design and manufacturing difficult, and can reduce insertion loss when light enters from a slab waveguide toward an arrayed waveguide or when the light enters from the arrayed waveguide toward the slab waveguide. An optical waveguide provided with a slab waveguide in which a grating is formed therein at a distance from an end, and an arrayed waveguide whose end is connected to an end of the slab waveguide at a position where a constructive interference portion of a self-image of the grating is formed. An arrayed waveguide grating provided with a first input/output waveguide, the above-mentioned optical waveguide where an end of the slab waveguide on the opposite side of the arrayed waveguide is connected to an end of the first input/output waveguide, a second slab waveguide connected to an end of the arrayed waveguide on the opposite side of the slab waveguide, and a second input/output waveguide connected to an end of the second slab waveguide on the opposite side of the arrayed waveguide.


Patent
Nippon Telegraph, Telephone and NTT Electronics | Date: 2015-04-10

A light modulation device detects a power of the modulated optical signal modulated by each of an I-component optical modulator and a Q-component optical modulator, synchronously-detects a component of a frequency fd from the power of the modulated optical signal, outputs a dither signal of a frequency fd/n (where n is a positive integer equal to or larger than 1) applied to a first bias voltage or a second bias voltage when adjusting the first bias voltage or the second bias voltage, outputs two dither signals having a frequency fd/m (where m is a positive integer equal to or larger than 1, where n


Patent
NTT Electronics, Nippon Telegraph and Telephone | Date: 2017-05-03

Before completion of merge encoding processing of an immediately preceding PU, a controller (21) determines the order of evaluation of merge candidates with the immediately preceding PU excluded from the merge candidates to be evaluated, and a merge-candidate derivation part (22) evaluates each merge candidate in the order of evaluation. After the completion of the merge encoding processing of the immediately preceding PU, the controller (21) re-determines the order of evaluation of merge candidates with the immediately preceding PU included in the merge candidates to be evaluated, and the merge-candidate derivation part (22) evaluates each merge candidate in the re-determined order of evaluation excluding the merge candidate whose evaluation has already been started.


Patent
NTT Electronics, Nippon Telegraph and Telephone | Date: 2016-10-25

Before completion of merge encoding processing of an immediately preceding PU, a controller determines the order of evaluation of merge candidates with the immediately preceding PU excluded from the merge candidates to be evaluated, and a merge-candidate derivation part evaluates each merge candidate in the order of evaluation. After the completion of the merge encoding processing of the immediately preceding PU, the controller re-determines the order of evaluation of merge candidates with the immediately preceding PU included in the merge candidates to be evaluated, and the merge-candidate derivation part evaluates each merge candidate in the re-determined order of evaluation excluding the merge candidate whose evaluation has already been started.


Patent
NTT Electronics, Nippon Telegraph and Telephone | Date: 2015-03-09

A method of manufacturing an optical module, comprising: mounting on a plane of a flat-plate-shaped base having a predetermined thickness: (a) an optical semiconductor package in which an active optical element is air-tightly sealed; (b) a waveguide optical element which wave-guides light from an optical fiber or to an optical fiber; and (c) an optical lens which connects the active optical element and the waveguide optical element; irradiating the plane with laser light at an angle close to horizontal to fix the optical lens using spot welding; covering the optical semiconductor package, the waveguide optical element, and the optical lens, with a frame-equipped lid having a bathtub shape; and fixing the frame-equipped lid onto the plane of the flat-plate-shaped base.


Patent
Nippon Telegraph, Telephone and NTT Electronics | Date: 2016-02-03

An optical switch with a flat transmission property is provided. The optical switch includes an input port, an output port, a diffractive grating configured to perform wavelength demultiplexing on an optical signal from the input port, and LCOS configured to deflect the wavelength-demultiplexed optical signal to the output port. The diffractive grating is pre-arranged such that a shape of the optical signal as entering the LCOS is asymmetric with respect to an axis in the LCOS surface that is orthogonal to a wavelength axis of the diffractive grating.


Patent
Nippon Telegraph, Telephone and NTT Electronics | Date: 2015-06-03

An objective is to provide an integrated optical module which can avoid positional change and separation of a PLC chip when humidity changes. Provided is an integrated optical module characterized in that the integrated optical module includes: a PLC chip (33) ; a seat (42) bonded and fixed to part of a lower surface of the PLC chip (33) with an adhesive which is applied to an upper surface of the seat (42) ; and a support portion (41) supporting the seat (42), in which a groove where an adhesive overflowing from the upper surface of the seat (42) is to stay is formed in an upper surface of the support portion (41) at a portion surrounding the seat (42), the upper surface of the seat serving as an adhesion surface.

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