MIRROR DRIVING CIRCUIT AND OPTICAL SWITCH

• US 20090244674A1
• Filed: 03/25/2009
• Published: 10/01/2009
• Est. Priority Date: 03/26/2008
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Shimizu, Takashi, Ishii, Yuji
• Granted Patent: US 8,331,004 B2
• Time in Patent Office: Days
• US Class Current: 359/221.200
• CPC Class Codes: G02B 26/0841 the reflecting element being moved or deformed by electrostatic means

Abstract

A mirror driving circuit applies a voltage to drive a mirror and switches an optical path of light output from a channel of an input port to a channel of an output port. The mirror driving circuit includes an offset-voltage applying unit that applies an offset voltage to the mirror, an applied-voltage determining unit that determines an applied voltage to be applied to the mirror based on a relation between the channel of the input port and the channel of the output port forming a path of the light, and a voltage applying unit that applies to the mirror a remaining voltage obtained by subtracting the offset voltage from the applied voltage.

Claims

1. A mirror driving circuit that applies a voltage to drive a mirror and switches an optical path of light output from a channel of an input port to a channel of an output port, the mirror driving circuit comprising:

an offset-voltage applying unit that applies an offset voltage to the mirror;

an applied-voltage determining unit that determines an applied voltage to be applied to the mirror based on a relation between the channel of the input port and the channel of the output port forming a path of the light; and

a voltage applying unit that applies to the mirror a remaining voltage obtained by subtracting the offset voltage from the applied voltage.

2. A mirror driving circuit that applies a voltage to drive a mirror and switches an optical path of light output from a channel of an input port to a channel of an output port, the mirror driving circuit comprising:

an offset-voltage output unit that outputs an offset voltage;

an applied-voltage determining unit that determines an applied voltage to be applied to the mirror based on a relation between the channel of the input port and the channel of the output port forming a path of the light;

a voltage output unit that outputs a remaining voltage obtained by subtracting the offset voltage from the applied voltage; and

a voltage adding unit that adds the offset voltage output from the offset-voltage output unit and the voltage output from the voltage output unit together and applies a voltage obtained through addition to the mirror.

3. The mirror driving circuit according to claim 2, wherein

the offset-voltage output unit includes a plurality of sub-offset-voltage output units that output different offset voltages.

4. The mirror driving circuit according to claim 2, wherein

the voltage output unit outputs one of a plus voltage and a minus voltage so that the output voltage is equal to the remaining voltage obtained by subtracting the offset voltage from the applied voltage.

5. An optical switch transmitting an optical signal, comprising:

a mirror driving circuit that applies a voltage to drive a mirror and switches an optical path of light output from a channel of an input port to a channel of an output port, the mirror driving circuit including

an offset-voltage output unit that outputs an offset voltage,

an applied-voltage determining unit that determines an applied voltage to be applied to the mirror based on a relation between the channel of the input port and the channel of the output port forming a path of the light,

a voltage output unit that outputs a remaining voltage obtained by subtracting the offset voltage from the applied voltage, and

a voltage adding unit that adds the offset voltage output from the offset-voltage output unit and the voltage output from the voltage output unit together and applies a voltage obtained through addition to the mirror.

6. The optical switch according to claim 5, wherein

the offset-voltage output unit includes a plurality of sub-offset-voltage output units that output different offset voltages.

7. The optical switch according to claim 5, wherein

the voltage output unit outputs one of a plus voltage and a minus voltage so that the output voltage is equal to the remaining voltage obtained by subtracting the offset voltage from the applied voltage.