Nippon Telegraph and Telephone Corporation

Masato Mizukami

Johji Yamaguchi

Kunihiko Sasakura

Naru Nemoto

Shingo Uchiyama

Yoshitaka Enomoto

Kazumasa Kaneko

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 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

An optical connector plug according to the present invention which is joined to a front end of an optical fiber cord covering an optical fiber and which is removably inserted to one end of an optical adapter having a locking member for locking the optical connector plug in an engaged state, includes an inserted portion removably inserted to one end of the optical adapter, a plug body joined to a front end of the optical fiber cord, a locking portion formed between the plug body and the inserted portion and locked by the locking member of the optical adapter, and a rotational phase reference surface formed on the plug body away from the locking portion. The optical connector plug according to the present invention can be applied to APC optical connector plug, secure high reliability for optical cross-connecting, and also reduce cost.

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Kanagawa, Japan

Masato Mizukami