# US 2024/0201249 A1 · Systems and methods for testing optical communication devices

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- Number: US 2024/0201249 A1
- Document ID: US20240201249A1
- Status: Published application
- Kind: A1
- Application number: 18/232,705
- Filed: 2023-08-10
- Published: 2024-06-20
- Earliest claimed: 2022-12-15
- Assignees: O-Net Communications Limited
- Inventors: Bouchaib Hraimel; Zining Huang
- Web page: https://patentgrep.com/patent/US20240201249A1

## CPC

- G01R 31/2867: {Handlers or transport devices, e.g. loaders, carriers, trays}
- G01R 31/2863: {Contacting devices, e.g. sockets, burn-in boards or mounting fixtures (in general G01R1/04)}
- G01R 31/287: {Procedures; Software aspects}
- G01R 31/2877: {related to cooling}
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

A test system for a device under test (DUT) includes an arm to hold the DUT, the arm having a predetermined heat capacity to act as a heat sink for the DUT; spring pins each to secure the DUT pins to pads on a test board, each pin supporting a 90 gigahertz bandwidth; and an actuator coupled to the arm to align the DUT over a test board on a horizontal X-axis and a vertica Y-axis, the actuator providing a compressive Z-axis force on the DUT to electrically couple the DUT to the test board.

## Claims

### Claim 1

A test system for a device under test (DUT), comprising:
an arm to hold the DUT, the arm having a predetermined heat capacity to act as a heat sink for the DUT;
spring pins each to secure the DUT pins to pads on a test board, each pin supporting at least a 90 gigahertz bandwidth; and
an actuator coupled to the arm to align the DUT over a test board on a horizontal X-axis and a vertical Y- axis, the actuator providing a compressive Z-axis force on the DUT to electrically couple the DUT to the test board.

### Claim 2 (depends on 1)

The system of claim 1, wherein the spring pin comprises a top plunger element defining an electrical contact at one end, and a plunger at an opposed end.

### Claim 3 (depends on 1)

The system of claim 1, wherein the actuator comprises a micro-positioner.

### Claim 4 (depends on 1)

The system of claim 1, wherein the actuator comprises a video camera for optical placement of the DUT.

### Claim 5 (depends on 4)

The system of claim 4, comprising means for positioning the arm based on a video feedback loop.

### Claim 6 (depends on 1)

The system of claim 1, wherein the DUT comprises a laser device and wherein the arm comprises a predetermined heat capacity to cool the DUT during testing.

### Claim 7 (depends on 1)

The system of claim 1, comprising test signal generator coupled to at least one of the pins to provide an input stimulus.

### Claim 8 (depends on 1)

The system of claim 1, wherein the DUT comprises a Transmitter Optical Sub Assembly (TOSA), a Receiver Optical Sub Assembly (ROSA), or a Bi-Directional Optical Sub Assembly (BOSA).

### Claim 9 (depends on 1)

The system of claim 1, wherein the DUT comprises a ball-grid-array (BGA) device.

### Claim 10 (depends on 1)

The system of claim 1, comprising a force sensor to detect the Z-axis force on the DUT and the test board.

### Claim 11

A method to test for a device under test (DUT), comprising:
securing the DUT to an arm having a predetermined heat capacity to act as a heat sink for the DUT;
moving the arm to align the DUT over a test board on a horizontal X-axis and a vertical Y-axis with an actuator; and
applying a compressive Z-axis force on the DUT to electrically couple the DUT to a test board with flexible pins to secure the DUT pins to pads on the test board, each pin supporting at least a 90 gigahertz bandwidth.

### Claim 12 (depends on 11)

The method of claim 11, wherein the spring pin comprises a top plunger element defining an electrical contact at one end, a plunger at an opposed end.

### Claim 13 (depends on 11)

The method of claim 11, wherein the actuator comprises a micro-positioner.

### Claim 14 (depends on 11)

The method of claim 11, wherein the actuator comprises a video camera coupled to the actuator, comprising performing computer vision for optical placement of the DUT over the test board.

### Claim 15 (depends on 14)

The method of claim 14, comprising positioning the arm based on a video feedback loop.

### Claim 16 (depends on 11)

The method of claim 11, wherein the arm comprises a predetermined heat capacity to cool the DUT.