Optical switch controller and movable body controller

Abstract

In an optical switch controller, in order that residual vibration at movement control of a movable body such as a tilt mirror can be reduced and controlled with high accuracy, a processing unit outputs a driving signal for controlling the angle of the tilt mirror, the driving signal is D/A converted by a D/A converter and then is changed to a high-voltage signal by a high-voltage amplifier to be supplied to the tilt mirror, the electrostatic capacity of the tilt mirror changes corresponding to angle change of the tilt mirror, a mirror-angle detecting unit detects the electrostatic capacity and feeds back it as a correction value to a processing unit, and the processing unit corrects the driving signal using a correction value obtained when the angle of the tilt mirror is actually changed.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a controller for controlling the movement of a movable body such as a mirror of an optical switch composed of a tilt mirror for which a MEMS technique is used; and more particularly to an optical switch controller and a movable body controller capable of reducing residual vibration at movement control of the movable body and performing the movement control accurately. [0003] 2. Description of Related Art Recently, traffic has been significantly increasing with rapid spread of the Internet. A wavelength division multiplexing (WDM) system is available as a system to construct a large capacity optical communication network dealing with the increase of traffic. A basic optical network constructed with a WDM system is provided with an optical cross-connect (OXC) system and an optical add / drop module (optical add / drop multiplexer (OADM)). An optical node constituted by an optical cross-con...

AI Technical Summary

Benefits of technology

[0033] According to the optical switch controller of the present invention, the electrostatic capacity caused at angle control of the mirror is detected, and the electrostatic capacity is fed back to correct the driving signal provided when the angular position of the mirror is changed, so that high-accurate angle control corresponding to actual angular positions of the mirror can be performed.

[0034] Furthermore, according to the movable body controller of the present invention, the electrostatic capacity caused at the movement of the movable body such as a mirror is detected, and the electrostatic capacity is fed back to correct the driving signal provided when the moving position of the movable body is changed, so that high-accurate movement control corresponding to actual movement conditions of the movable body can be performed. In particular, residual vibration caused by the self-resonance can be prevented by performing feedback control of the tilt of the movable body such as a mirror is performed so that the tilt of the movable body such as a mirror does not become a predetermined angle (capacity causing the self-resonance).

[0035] Furthermore, according to the optical switch controller of the present invention, all an

Problems solved by technology

Because of this, a continuous feedforward control system using the driving unit described above has a problem that the residual vibration can not be restricted when the angle of the mirror is changed particularly to a minus angle.

An optical switch composed of such a tilt mirror reduces the accuracy and response speed of angle control in changeover of optical paths of optical transmission lines.

A tilt mirror is taken as an example in the above description, but the same problem arises also when controlling, in the same way, the movement of a micro movable body using a MEMS technology, etc.

Furthermore, the A/D converter 12 a provided in the optical switch controller shown in FIG. 21A is large in circuit scale and power consumption in general, and has a characteristic of being weak against crosst

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