Nippon Telegraph and Telephone Corporation

Wataru Kawakami

Akira Hirano

Takuya Oda

Seiji Okamoto

Takafumi Tanaka

Fumikazu Inuzuka

Tetsuro Inui

Hideki Nishizawa

Shokei Kobayashi

Seiki Kuwabara

Kei Kitamura

A state estimating device includes a pre-processing unit and an estimating unit. The pre-processing unit acquires data representing at one or more of a phase of a signal transmitted from a transmission unit of a transmission device and received at a reception unit of another transmission device via a transmission path, a reception strength, a reception quality, a voltage after conversion into an electric signal, and a signal processing parameter used in reception processing, and processes the acquired data into feature data to be used for state estimation. The estimating unit estimates a state of the transmission path, an abnormal state of the transmission unit, or an abnormal state of the reception unit, on the basis of the feature data.

State estimating device and communication system

There is provided an optical transmission system in which a plurality of optical transmission and reception apparatuses perform 1-to-N transmission and reception of optical signals (N is an integer equal to or greater than 1), the optical transmission system being configured to select a communication condition that includes at least a modulation scheme or a baud rate and is a communication condition when each of the optical transmission and reception apparatuses performs transmission and reception in accordance with a transmission line condition that is between any one first optical transmission and reception apparatus and each of second optical transmission and reception apparatuses, which are N grounds, other than the first optical transmission and reception apparatus.

Optical transmission system and communication condition selection method

Growing community of inventors

Tokyo, Japan

Wataru Kawakami