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

[0023] In order to solve the above-mentioned problem in the conventional technology, and it is an object of the present invention to provide an optical switch controller and movable body controller capable of reducing the residual vibration of a movable body such as a tilt mirror caused when the movement of the movable body is controlled, and performing high-accurate control.

[0024] The second invention is to provide an optical switch controller which allows circuit scale reduction and circuit integration by performing only digital signal processing without performing any analog signal processing by A / D converters, etc., thus allowing a large scale optical switch.

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 crosstalk between channels, and the like because it is an analog circuit, thereby being a bottleneck in realization of a large-scale optical cross-connecting device.

The reason is that since the angle sensor is an analog circuit, complex analog processing such as A / D conversion is required, and thereby a large-scale optical switch can not be realized.

Conventionally, it results a large-scale circuit that an IC (Integrated Circuit) containing hundreds of A / D converters is mounted on a board or substrate for the purpose of realization of a large-scale switch, and it requires a large chip area that the A / D converters are integrated in a controller IC or a controller LSI (Large Scale Integration) for the same purpose, and therefore there is a problem that it is imposssible to realize a large-scale switch.

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