Multi-segment Mach-Zehnder modulator-driver system

• US 9,733,542 B2
• Filed: 08/21/2015
• Issued: 08/15/2017
• Est. Priority Date: 08/25/2014
• Status: Active Grant

• Current Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Inventors: Bai, Yu Sheng
• Primary Examiner(s): Hollweg, Thomas A
• Assistant Examiner(s): ANDERSON, GUY G
• Application Number:
  US14/832,909
• Publication Number:
  US 20160062207A1
• Time in Patent Office: 725 Days
• Field of Search: 385 1- 3
• CPC Class Codes: G02F 1/212 Mach-Zehnder type
• CPC Class Codes: G02F 1/225 in an optical waveguide structure
• CPC Class Codes: G02F 1/2257 the optical waveguides being made of semiconducting material

Abstract

An optical modulator comprising a waveguide for propagating an optical signal comprising a proximate arm configured to communicate a proximate portion of the optical signal, and a distal arm configured to communicate a distal portion of the optical signal, a proximate diode configured to modulate the proximate portion of the optical signal, a distal diode configured to modulate the distal portion of the optical signal, and an electrical input electrically coupled to opposite signed interfaces of the proximate diode and the distal diode such that an electrical driving signal propagated along the electrical input causes an equal and opposite modulation of the proximate portion of the optical signal in the proximate arm of the waveguide and the distal portion of the optical signal in the distal arm of the waveguide.

Claims

1. An optical modulator comprising:

a waveguide for propagating an optical signal comprising;

a proximate arm; and

a distal arm; and

a plurality of proximate diodes positioned along the proximate arm of the waveguide and a plurality of distal diodes positioned along the distal arm of the waveguide, wherein the plurality of proximate diodes are configured to modulate a proximate portion of the optical signal, wherein the plurality of distal diodes are configured to modulate a distal portion of the optical signal, wherein one of the plurality of proximate diodes and one of the plurality of distal diodes form a proximate diode and distal diode pair,

wherein each proximate diode and distal diode pair is coupled to a primary output of a segment driver such that the primary output of the segment driver is coupled to a first interface of a proximate diode and a second interface of a distal diode of each proximate diode and distal diode pair, and wherein the first interface of the proximate diode and the second interface of the distal diode are opposite signed interfaces.

2. The optical modulator of claim 1, wherein each proximate diode and distal diode pair is further coupled to a complementary output of the segment driver, such that the complementary output is coupled to a second interface of the proximate diode and a first interface of the distal diode of each proximate diode and distal diode pair, and wherein the second interface of the proximate diode and the first interface of the distal diode are opposite signed interfaces.

3. The optical modulator of claim 2, wherein the segment driver coupled to each proximate diode and distal diode pair is a single driver.

4. The optical modulator of claim 2, wherein the primary output and the complementary output of the segment driver provide a common signal with opposite electrical signs, and wherein the proximate portion of the optical signal in the proximate arm of the waveguide and the distal portion of the optical signal in the distal arm of the waveguide are modulated in equal value and opposite phase.

5. The optical modulator of claim 4, wherein the segment driver is a single driver.

6. The optical modulator of claim 1, wherein the primary output of the segment driver is electrically coupled to a cathode of the proximate diode and an anode of the distal diode.

7. The optical modulator of claim 1, wherein the primary output of the segment driver is electrically coupled to an anode of the proximate diode and a cathode of the distal diode.

8. The optical modulator of claim 1, wherein the optical modulator comprises silicon, Indium Phosphide (InP), Gallium Arsenide (GaAs), lithium niobate (LiNbO3), or combinations thereof.

9. A single-drive multi-segment optical modulator system comprising:

an optical modulator comprising;

a proximate waveguide arm configured to communicate a proximate half of an optical signal;

a distal waveguide arm configured to communicate a distal half of the optical signal; and

a plurality of modulator segments such that each modulator segment is configured to modulate a corresponding electrical signal input onto both the proximate waveguide arm and the distal waveguide arm, wherein each modulator segment comprises a proximate diode positioned across the proximate waveguide arm and a distal diode positioned across the distal waveguide arm, wherein the proximate diode and the distal diode of each modulator segment forms a proximate diode and distal diode pair; and

a drive circuit electrically coupled to the optical modulator and comprising a plurality of drivers corresponding to the plurality of modulator segments such that each driver of the plurality of drivers comprises a primary output configured to provide a primary electrical signal to the corresponding modulator segment,

wherein each proximate diode and distal diode pair is coupled to the primary output of the driver such that the primary output of the driver is coupled to a first interface of a proximate diode and a second interface of a distal diode of each proximate diode and distal diode pair, and wherein the first interface and the second interface of each of the proximate diode and the distal diode are opposite signed interfaces.

10. The system of claim 9, wherein each driver of the plurality of drivers further comprises a complementary output configured to provide a complement electrical signal to the corresponding modulator segment such that the complementary output of the driver is coupled to a second interface of the proximate diode and a first interface of the distal diode of each proximate diode and distal diode pair, and wherein each complement electrical signal comprises an equivalent amplitude and opposite charge to a corresponding primary electrical signal.

11. The system of claim 10, wherein the second interface of the proximate diode and the first interface of the distal diode of each proximate diode and distal diode pair are opposite signed interfaces.

12. The system of claim 11, wherein each complement electrical signal is coupled to different oppositely polarized interfaces than the corresponding primary electrical signal.

13. The system of claim 12, wherein each complement electrical signal is coupled to an anode of a corresponding proximate diode and a cathode of a corresponding distal diode, and wherein each primary electrical signal is coupled to a cathode of the corresponding proximate diode and an anode of the corresponding distal diode.

14. The system of claim 12, wherein each complement electrical signal is coupled to a cathode of a corresponding proximate diode and an anode of a corresponding distal diode, and wherein each primary electrical signal is coupled to an anode of the corresponding proximate diode and a cathode of the corresponding distal diode.

15. The system of claim 9, wherein the optical modulator comprises silicon, Indium Phosphide (InP), Gallium Arsenide (GaAs), lithium niobate (LiNbO3), or combinations thereof.

16. The system of claim 9, wherein the driver provides direct current signals.

17. The system of claim 9, wherein the driver provides alternating current signals.

18. A method of optical modulation, comprising

propagating, by a waveguide of an optical modulator, an optical signal by:

modulating, by a plurality of proximate diodes positioned along a proximate arm of the waveguide, a proximate portion of an optical signal; and

modulating, by a plurality of distal diodes positioned along a distal arm of the waveguide, a distal portion of the optical signal,

wherein one of the plurality of proximate diodes and one of the plurality of distal diodes form a proximate diode and distal diode pair,

wherein each proximate diode and distal diode pair is coupled to a primary output of a segment driver such that the primary output of the segment driver is coupled to a first interface of a proximate diode and a second interface of a distal diode of each proximate diode and distal diode pair, and

wherein the first interface of the proximate diode and the second interface of the distal diode are opposite signed interfaces.

19. The method of claim 18, wherein each proximate diode and distal diode pair is further coupled to a complementary output of the segment driver, such that the complementary output of the segment driver is coupled to a second interface of the proximate diode and a first interface of the distal diode of each proximate diode and distal diode pair, and wherein the second interface of the proximate diode and the first interface of the distal diode are opposite signed interfaces.

20. The method of claim 19, further comprising providing, by the primary output and the complementary output of the segment driver, a common signal with opposite electrical signs.