Nippon Telegraph and Telephone Corporation

Kunihiko Sasakura

Makoto Sato

Johji Yamaguchi

Hiromu Ishii

Fusao Shimokawa

Shingo Uchiyama

Katsuyuki Machida

Hirofumi Morita

Shuichiro Inagaki

Makoto Murakami

Akira Nagayama

Masato Mizukami

Masao Kawachi

Naru Nemoto

Yoshitaka Enomoto

Mitsuhiro Makihara

Tadao Saitoh

Tsuneo Kanai

Shigefumi Hosokawa

Takashi Yoshizawa

Kazumasa Kaneko

Shigeru Umemura

Syuichirou Inagaki

Hirobumi Kimura

Sigemitu Oguchi

A mirror device includes a mirror () which is supported to be pivotable with respect to a mirror substrate (), a driving electrode (---) which is formed on an electrode substrate () facing the mirror substrate, and an antistatic structure () which is arranged in a space between the mirror and the electrode substrate. This structure can fix the potential of the lower surface of the mirror and suppress drift of the mirror by applying a second potential to the antistatic structure.

Mirror device, mirror array, optical switch, mirror device manufacturing method, and mirror substrate manufacturing method

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

When a mirror () rotates with a maximum angle, a distance from the rotation center of the mirror () to the edge of the mirror () along a direction horizontal to an electrode substrate () is larger than a distance from a perpendicular, perpendicular to the horizontal direction and extending through the rotation center, to the distal end of an electrode (-) along the horizontal direction. Even when the mirror () rotates to come into contact with the electrode substrate (), since the electrode (-) does not exist at a position with which the mirror () comes into contact when rotating, the mirror () and the electrode (-) can be prevented from being electrodeposited.

Mirror device and mirror device manufacturing method incorporating a collision preventive structure

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.

Optical fiber cross-connect with a connection block, an alignment block and a handling device

An automatic assembly and inspection system for optical connectors is provided, which is highly reliable and which can produce economical and highly-effective optical cords or cables with optical connectors. The automatic assembly and inspection system for optical connectors comprises a pallet for installing an optical cord; a transfer mechanism for transferring the pallet; modules for performing various processes for assembling an optical connector with the optical cord installed on the pallet which is transferred by the transfer mechanism, said various processes including one or more of the processes such as required-length cutting, pre-processing, cleaning, insertion, curing, polishing, polished surface inspection, final assembling, optical performance evaluation, and stamping, and each of the modules having a common combining mechanism and a common communication means with respect to the transfer mechanism; and a system controller for performing supervised control for the transfer mechanism and the modules based on parameters which indicate specifications for assembly and inspection of the optical connector.

Automatic assembly and inspection system for optical connector

In an optical MDF (main distributing frame) for interconnecting external subscriber optical lines (122) with office optical lines (131) through jumpering operation, a matrix waveguide (128, 129, 130) having a plurality of crosspoints coupled with external lines and office lines is used. The matrix waveguide has a groove (235 in FIG. 4A) at each crosspoint so that said crosspoint is switched ON or OFF depending upon whether said groove is filled with matching oil or not, so that one of the external lines is connected to the selected office line. Said matching oil has the same refractive index as that of waveguides. Each crosspoint groove is coupled with a respective oil pool (236), which supplies matching oil which has essentially the same refractive index as that of a waveguide to said groove. Switching at a crosspoint is carried out in a manner that a light signal in a waveguide goes straight through the crosspoint when a groove is filled with matching oil, and the light signal changes its direction at the crosspoint through total internal reflection when the groove is empty. A jumpering operation to connect or disconnect a crosspoint is carried out by a robot (133), which fills or pulls out matching oil in the oil pool at the designated coordinates. Each external line is branched by using an optical directional coupler (237) for test purposes, and one of the branch lines subject to test is selected by using a similar 1.times.N type matrix waveguide. (FIG. 4A)

Automated optical main distributing frame system

Growing community of inventors

Kanagawa, Japan

Kunihiko Sasakura