# US 2014/0153858 A1 · Electro-optic modulator

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- Number: US 2014/0153858 A1
- Document ID: US20140153858A1
- Status: Published application
- Kind: A1
- Application number: 13/736,956
- Filed: 2013-01-09
- Published: 2014-06-05
- Earliest claimed: 2012-11-30
- Assignees: Hon Hai Precision Industry Co., Ltd.
- Applicants: Hon Hai Precision Industry Co., Ltd
- Inventors: HSIN-SHUN HUANG
- Web page: https://patentgrep.com/patent/US20140153858A1

## CPC

- G02F 1/365: in an optical waveguide structure (G02F1/377, {G02F1/395} take precedence)
- G02F 1/035: in an optical waveguide structure
- G02F 1/0353: {involving an electro-optic TE-TM mode conversion}
- G02F 1/0144: {TE-TM mode separation}
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

An electro-optic modulator includes a substrate, a Y-shaped waveguide, a pair of first electrodes, and a pair of second electrodes. The substrate includes a top surface. The Y-shaped waveguide is embedded into the top surface, and includes a first branch and a second branch. The first branch is subjected to a transverse electric wave and the second branch is subjected to a transverse magnetic wave. The pair of first electrodes are positioned on the top surface and arranged at two sides of the first branch. The pair of second electrodes are positioned on the top surface. One of the second electrodes covers the second branch, and the other is arranged at a side of the second branch.

## Claims

### Claim 1

An electro-optic modulator, comprising:
a substrate comprising a top surface;
a Y-shaped waveguide implanted into the top surface and comprising a first branch and a second branch, the first branch being dedicated for transmitting transverse electric wave, the second branch being dedicated for transmitting transverse magnetic wave;
a pair of first electrodes positioned on the top surface and arranged at two sides of the first branch and opposite to each other; and
a pair of second electrodes positioned on the top surface, one of the second electrodes covering the second branch, and the other being arranged a side of the second branch.

### Claim 2 (depends on 1)

The electro-optic modulator of claim 1, wherein the substrate is made of lithium niobate crystal.

### Claim 3 (depends on 1)

The electro-optic modulator of claim 1, wherein the Y-shaped waveguide comprises an input section and an output section, and the first branch and the second branch are branched from the input section and converge into the output section.

### Claim 4 (depends on 3)

The electro-optic modulator of claim 3, wherein the input section and the output section are formed by diffusing titanium into the substrate and configured for transmitting both the transverse electric wave and the transverse magnetic wave.

### Claim 5 (depends on 3)

The electro-optic modulator of claim 3, wherein the first branch is formed by diffusing titanium into the substrate and then further diffusing zinc-nickel alloy into the substrate.

### Claim 6 (depends on 3)

The electro-optic modulator of claim 3, wherein the second branch is formed by diffusing titanium into the substrate and then further diffusing Gallium into the substrate.

### Claim 7 (depends on 1)

The electro-optic modulator of claim 1, wherein the first electrodes and the second electrodes are all rectangular strips and are all as long as and aligned with the first branch.

### Claim 8 (depends on 1)

The electro-optic modulator of claim 1, further comprising a buffer layer sandwiched between the substrate and all of the first electrodes and the second electrodes.

### Claim 9 (depends on 8)

The electro-optic modulator of claim 8, wherein the buffer layer is made of silicon dioxide.