Nippon Telegraph and Telephone Corporation

Naru Nemoto

Toshikazu Hashimoto

Johji Yamaguchi

Masashi Miyata

Mitsumasa Nakajima

Shingo Uchiyama

Masato Mizukami

Tsuyoshi Yamamoto

Kenya Suzuki

Keita Yamaguchi

Yuzo Ishii

Junji Sakamoto

Etsu Hashimoto

Kazunori Seno

Shiori Sugimoto

Kunihiko Sasakura

Koichi Hadama

Joji Yamaguchi

Yoshito Jin

Yoko Sogabe

Fumihide Kobayashi

An imaging device includes an optical element including a transparent substrate, and a plurality of structures disposed on or in the transparent substrate in a plane direction of the transparent substrate, an imaging element in which a plurality of pixels including photoelectric conversion elements are disposed, and a signal processing unit configured to generate an image signal based on an electrical signal acquired from the imaging element, wherein the optical element forms an image in which a point spread function of each wavelength is convoluted on a plurality of pixels corresponding to each polarized light component depending on polarized light components by outputting light in a state in which the optical element has different point spread functions for respective wavelengths, the plurality of structures have the same height in a side view, and the signal processing unit reconstructs an image in which a point spread function is convoluted.

Hyperspectral imaging device capable of acquiring polarization information and optical element thereof

An imaging element () includes a pixel array () in which pixels () are placed in a two-dimensional array, the pixel including a photoelectric conversion element; and a polarization-wavelength separation lens array () opposed to the pixel array (), the polarization-wavelength separation lens array () including polarization-wavelength separation lens () placed in a two-dimensional array, the polarization-wavelength separation lens () including a plurality of microstructures for condensing incident light at different positions on the pixel array () according to the polarization direction and wavelength components of the incident light.

Image sensor and imaging device

In a conventional RGB coupler, the split ratio largely depends on the wavelength. The split ratio of R and the split ratios of G and B are non-uniform because R has a wavelength far from those of G and B. Accordingly, a video display device needs to have the monitoring detection value corrected, making it difficult to use the monitoring function. A light combining circuit and a light source of this disclosure include a first splitting unit for splitting R wavelength light and a second splitting unit for splitting G and B combined light. They split monochromatic light of R and combined light of G and B, independently. G and B light from an LD are first combined by a preliminary wave-combining unit before being split. The split lights of each wavelength are combined by a main wave-combining unit, outputting RGB combined light. Each split light from the two splitting units is detected by a single PD.

Optical multiplexing circuit and optical source

An optical input/output device includes a phase modulator element and an optical element. The phase modulator element includes a plurality of pixels arranged in a matrix and is configured to change an optical phase of signal light by applying a driving signal corresponding to a phase pattern. The optical element is configured to convert a direction of exit of the signal light so as to irradiate each pixel with the signal light from the input port. A pattern generator unit includes superimposing means for superimposing a periodic phase pattern having a predetermined period in at least one direction in a plane of the phase modulator element, and means for controlling an amplitude of the periodic phase pattern. The signal light is diffracted to a position according to the period of the superimposed periodic phase pattern, so that light intensity of the signal light is dispersed.

Optical input/output device

When a light intensity upon a perturbation is detected, an error calculation/correction unit () in a control unit () corrects and updates the above-described initial manipulated variables based on perturbation manipulated variables and manipulated variables, i.e., operation manipulated variables to obtain the maximum light intensity from the light intensity value at each perturbation manipulated variable, thereby adjusting the tilt angle of a mirror. More specifically, assuming that the time series data of an acquired output light intensity can be approximated to a cosine function, the error calculation/correction unit () calculates a phase difference &#x3b8; between the cosine function and a sine or cosine function used to set x- and y-axis perturbation patterns for a circular trajectory perturbation. Manipulated variables at coordinates defined by the phase difference &#x3b8; and polar coordinates of a radius voltage to perturb the mirror are calculated. Voltage values at coordinates defined by a function for setting the driving voltages of the mirror () are calculated and set as the driving voltages for one output port.

Optical switch, optical switch control method and communication system

A detection means () detects optimum driving voltages of a mirror device. A correction means () corrects driving voltage values in a table () based on the optimum driving voltages. This makes it possible to drive the mirror to an optimum pivot angle even when the optimum pivot angle of the mirror changes due to, e.g., mirror drift or a change in the environment such as temperature.

Optical switch

A mirror control device includes a pivotally supported mirror (), electrodes (-) spaced apart from the mirror (), a driving voltage generation means () for generating a driving voltage corresponding to the desired tilt angle of the mirror () for each electrode, a bias voltage generation means () for generating, as a bias voltage for each electrode, a voltage which causes the tilt angle of the mirror () to have the same predetermined value upon being independently applied to each of the electrodes (-), and an electrode voltage applying means () for adding, for each electrode, the bias voltage to the driving voltage and applying the voltage after addition to a corresponding one of the electrodes (-).

Mirror control device

Growing community of inventors

Kanagawa, Japan

Naru Nemoto