Nippon Telegraph and Telephone Corporation

Ntt Corporation

Yumiko Senoo

Takuya Kanai

Kota Asaka

Takeshi Imai

Junichi Kani

Hirotaka Ujikawa

Kazuaki Honda

Takahiro Suzuki

Ryo Koma

Shin Kaneko

An optical communication device that communicates with another optical communication device by using at least a time division multiplexing system, the optical communication device including: a management control signal division unit that divides a management control signal used for management and control; and a transmission unit that transmits the management control signal divided, by including the management control signal divided in a burst signal to be transmitted at an assigned transmission timing.

Optical communication device, optical access system and optical communication method

A wavelength-selective optical reception device includes a photoreceptor () that converts optical signals () into electric signals and outputs the electric signals, a base () on which the photoreceptor () is provided, a housing () that is mounted on the base () and surrounds the photoreceptor () along with the base (), and that is provided with a window () to pass optical signals () including the optical signals () and including optical signals () of a wavelength different from a first wavelength of the optical signals () and a window () to pass the optical signals (), and an optical filter () that is disposed inside the housing between the window () and the photoreceptor () along the optical axis () of the optical signals (), and that outputs, out of the optical signals () that enter thereto, the optical signals () toward the photoreceptor (), and reflects the optical signals () toward a near side in a direction of travel of the optical signals ().

Wavelength-selection type optical receiving apparatus

A communication system includes a subscriber network unit and a communication device provided in an accommodating station. The subscriber network unit includes an acquisition unit that acquires uplink data from one or more lower-layer devices. The communication device includes: a data processing unit that acquires the uplink data from the subscriber network unit using a band of uplink communication and executes data processing on the acquired uplink data; a policy determination unit that determines a policy of band allocation of the uplink communication on the basis of the result of the data processing; and an allocation control unit that allocates the band of the uplink communication to the subscriber network unit on the basis of the policy.

Communication system, communication apparatus and bandwidth allocation method

An optical wavelength selecting filter-module into which light is incident from a prescribed direction determined in advance, the optical wavelength-selective filter module including: an optical filter of which an orientation can be changed; a frequency information acquiring unit which acquires frequency information that is information indicating a frequency of light to be transmitted through the optical filter; a temperature information acquiring unit which acquires temperature information that indicates a temperature of the optical filter; a determining unit which determines an orientation of the optical filter based on relationship information that is information associating, for each prescribed frequency, the temperature and an orientation of the optical filter at which light of the frequency is transmitted through the optical filter at transmittance equal to or higher than prescribed transmittance at the temperature, a temperature indicated by the temperature information, and a frequency indicated by the frequency information; and an actuator which points the optical filter in an orientation having been determined by the determining unit.

Optical wavelength selecting filter-module and optical wavelength selecting method

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Musashino, Japan

Yumiko Senoo