OPTICAL SIGNAL CONTROL DEVICE AND OPTICAL SIGNAL CONTROL METHOD

• US 20130272700A1
• Filed: 12/06/2011
• Published: 10/17/2013
• Est. Priority Date: 12/06/2010
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Kato, Tomoaki, Sato, Kenji, Satoh, Mineto
• Granted Patent: US 9,391,710 B2
• Time in Patent Office: Days
• US Class Current: 398/45
• CPC Class Codes: H04B 10/50 Transmitters
• CPC Class Codes: H04B 10/516 Details of coding or modulation

Abstract

An optical signal control device includes an optical signal control unit and a drive circuit. The optical signal control unit includes m number of optical waveguides for propagating carrier light and (m×n) number of interaction regions, n number of interaction regions formed on each of the optical waveguides. The drive circuit includes (m×n) number of phase control units. The (m×n) number of phase control unit output a data signal for controlling the action of the (m×n) number of interaction regions to each of the (m×n) number of interaction regions. Each of the (m×n) number of phase control units outputs the data signal so that timing when the carrier light propagates to the interaction region to output the data signal and timing when the data signal arrives at the interaction region are synchronized. One of m and n is two or more.

Claims

1. An optical signal control device comprising:

an optical signal control unit that outputs output light generated by changing an amplitude and a phase of input carrier light; and

a drive circuit that supplies a data signal for controlling a change in the amplitude and the phase of the carrier light to the optical signal control unit, wherein

the optical signal control unit includes;

m (m is an integer of one or more) number of optical waveguides arranged in parallel between light input and light output, for letting the carrier light propagate therethrough; and

(m×

n) number of interaction regions, n (n is an integer of one or more) number of interaction regions formed on each of the m number of optical waveguides, for changing the amplitude and the phase of the carrier light propagating through each of the m number of optical waveguides in accordance with the data signal,

the drive circuit includes;

(m×

n) number of phase control units that receive the data signal from outside, control the phase of the received data signal and output the data signal to each of the (m×

n) number of interaction regions,

each of the (m×

n) number of phase control units outputs the data signal so that timing when the carrier light propagating through the optical signal control unit arrives at the interaction region to output the data signal and timing when the data signal arrives at the interaction region are synchronized, and

one of m and n is two or more.

2. The optical signal control device according to claim 1, wherein

the (m×

n) number of phase control unit output the data signal at different timing from one another.

3. The optical signal control device according to claim 1, wherein

each of the (m×

n) number of phase control units outputs the data signal at later timing as the interaction region to output the data signal is farther from a light input end of the optical signal control unit.

4. The optical signal control device according to claim 1, wherein

each of the (m×

n) number of phase control units outputs the data signal at later timing as the interaction region to output the data signal is closer to the drive circuit.

5. The optical signal control device according to claim 1, wherein

the optical signal control unit further includes:

a first optical splitter/combiner placed on a light input end of any two optical waveguides among the m number of optical waveguides; and

a second optical splitter/combiner placed on a light output end of the two optical waveguides, and

the two optical waveguides, the first optical splitter/combiner and the second optical splitter/combiner form one set of Mach-Zehnder interferometer.

6. The optical signal control device according claim 1, wherein

the optical signal control unit further includes:

a first electrode formed above a core layer of a first interaction region among the (m×

n) number of interaction regions;

a second electrode formed below the core layer of the first interaction region;

a first terminal connected to the first electrode; and

a second terminal connected to the second electrode, and

the data signal is input to one of the first terminal and the second terminal, and another one is connected to a ground.

7. The optical signal control device according to claim 6, wherein

the first electrode and the first terminal are connected by an electrical wire, and

the first interaction region, the first electrode and the electrical wire are formed in different layers or on electrically isolated regions between adjacent first electrodes, so that the electrical wire and the interaction regions different from the first interaction region are electrically isolated.

8. The optical signal control device according to claim 6, wherein

the first electrode and the second electrode formed on each of the (m×

n) number of interaction regions are lumped electrodes.

9. The optical signal control device according to any one of claims 6 to 8, wherein

the drive circuit further includes:

a third terminal connected to a first phase control unit among the (m×

n) number of phase control units and the first terminal;

a fourth terminal connected to the second terminal on a path connecting the first phase control unit and the second terminal; and

a first terminator with one end connected to the first phase control unit and another end connected to the fourth terminal and a ground.

11. The optical signal control device according to claim 6, wherein the drive circuit further includes:

a third terminal connected to a first phase control unit among the (m×

n) number of phase control units and the second terminal;

a fourth terminal connected to the first phase control unit and the first terminal; and

a first terminator with one end connected to the first phase control unit and another end connected to the fourth terminal and a ground.

12. The optical signal control device according to claim 9, wherein the optical signal control unit includes:

a third electrode formed above a core layer of a second interaction region different from the first interaction region;

a fourth electrode formed below the core layer of the second interaction region and connected to the second terminal; and

a fifth terminal connected to the third electrode, and the drive circuit further includes;

a sixth terminal connected to a second phase control unit different from the first phase control unit and the fifth terminal; and

a second terminator with one end connected to the fourth terminal and another end connected to the sixth terminal.

13. The optical signal control device according to claim 12, wherein

the third electrode and the fourth electrode are lumped electrodes being the same as the first electrode and the second electrode.

14. The optical signal control device according to claim 1, wherein

the optical signal control unit includes 1 (1 is an integer of two or more) number of optical splitters/combiners, and

each of the 1 number of optical splitters/combiners is placed between the interaction regions formed on any two optical waveguides among the m number of optical waveguides.

10. An optical signal control method comprising:

inputting carrier light to m (m is an integer of one or more) number of optical waveguides;

receiving a data signal for controlling a change in an amplitude and a phase of the carrier light by (m×

n) number of phase control units and controlling the phase of the received data signal;

outputting the data signal with the controlled phase from the (m×

n) number of phase control units to (m×

n) number of interaction regions, n (n is an integer of one or more) number of interaction regions formed on each of the m number of optical waveguides, so that the data signal with the controlled phase arrives at the interaction region in synchronization with timing when the carrier light arrives at each of the (m×

n) number of interaction regions; and

outputting the carrier light with the amplitude and the phase changed by the (m×

n) number of interaction regions as output light,

wherein one of m and n is two or more.

15. An optical matrix switch comprising:

an optical switch unit that changes an amplitude and a phase of input carrier light and outputs output light; and

a drive circuit that supplies a data signal for controlling operation of the optical switch unit, wherein

the optical switch unit includes;

m (m is an integer of one or more) number of optical waveguides arranged in parallel between light input and light output, for letting the carrier light propagate therethrough;

(m×

n) number of interaction regions, n (n is an integer of one or more) number of interaction regions formed on each of the m number of optical waveguides; and

1 (1 is an integer of two or more) number of optical splitters/combiners, the drive circuit includes;

(m×

n) number of phase control units that receive the data signal for controlling an action of the (m×

n) number of interaction regions and output the received data signal to each of the (m×

n) number of interaction regions,

each of the (m×

n) number of phase control units outputs the data signal so that timing when the carrier light propagates to the interaction region to output the data signal and timing when the data signal arrives at the interaction region are synchronized,

one of m and n is two or more, and

each of the 1 number of optical splitters/combiners is placed between the interaction regions formed on any two optical waveguides among the m number of optical waveguides.

16. An optical signal control device comprising:

an optical signal control means for outputting output light generated by changing an amplitude and a phase of input carrier light; and

a drive circuit for supplying a data signal for controlling a change in the amplitude and the phase of the carrier light to the optical signal control means, wherein

the optical signal control means includes;

m (m is an integer of one or more) number of optical waveguides arranged in parallel between light input and light output, for letting the carrier light propagate therethrough; and

(m×

n) number of interaction regions, n (n is an integer of one or more) number of interaction regions formed on each of the m number of optical waveguides, for changing the amplitude and the phase of the carrier light propagating through each of the m number of optical waveguides in accordance with the data signal,

the drive circuit includes;

(m×

n) number of phase control means for receiving the data signal from outside, controlling the phase of the received data signal and outputting the data signal to each of the (m×

n) number of interaction regions,

each of the (m×

n) number of phase control means outputs the data signal so that timing when the carrier light propagating through the optical signal control means arrives at the interaction region to output the data signal and timing when the data signal arrives at the interaction region are synchronized, and

one of m and n is two or more.