# US 10,120,144 B2 · System, method, and apparatus for performing alignment between an optical transceiver and an optical reflector

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- Number: US 10,120,144 B2
- Document ID: US10120144B2
- Status: Granted
- Kind: B2
- Application number: 15/756,177
- Filed: 2015-09-03
- Published: 2018-09-13
- Granted: 2018-11-06
- Earliest claimed: 2015-09-03
- Assignees: Telefonaktiebolaget LM Ericsson (publ)
- Applicants: Telefonaktiebolaget Lm Ericsson (Publ)
- Inventors: Mats Rehnström; Marie Press; Lars Olof Gerhard Winberg
- Web page: https://patentgrep.com/patent/US10120144B2

## CPC

- G02B 6/4214: {the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device (G02B6/4246 takes precedence)}
- G02B 6/4225: {by a direct measurement of the degree of coupling, e.g. the amount of light power coupled to the fibre or the opto-electronic element}
- G02B 6/4226: {Positioning means for moving the elements into alignment, e.g. alignment screws, deformation of the mount}
- G02B 6/43: Arrangements comprising a plurality of opto-electronic elements and associated optical interconnections
- H04B 10/801: {using optical interconnects, e.g. light coupled isolators, circuit board interconnections}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04B: TRANSMISSION

## Abstract

An apparatus (122) for positioning an optical transceiver (205) relative to a reflector (218) in a multi-layer circuit board (160) is presented. The apparatus includes an optical transceiver (205), a housing (203) in which the optical transceiver (205) is located, a first platform (410), a second platform (420) offset from the first platform (410), and a frame (450) surrounding the second platform (420). The first platform (410) has a first side (413) and a second side (414) opposite the first side (413). The housing (203) is attached to the first side (413). The apparatus further includes a set of actuators comprising a first actuator (442), a second actuator (443), and a third actuator (445), which are connected to the second side (414), and includes a fourth actuator (441) and a fifth actuator (444). Each of the first, second, and third actuators is connected to a first side (421) of the second platform, and is configured such that each can be controlled to move the transceiver (205) by moving along a first axis that is orthogonal to the first side of the second platform, thereby moving the first platform (410). The fourth actuator (441) is attached to the frame and is operable to displace the second platform along a second axis that is orthogonal to the first axis. The fifth actuator (444) is attached to the frame and is operable to displace the second platform along a third axis that is orthogonal to the first axis and to the second axis.

## Claims

### Claim 1

An apparatus for positioning an optical transceiver relative to a reflector in a multi-layer circuit board having a layer for routing an optical signal, the apparatus comprising:
an optical transceiver;
a housing in which the optical transceiver is located;
a first platform having a first side and a second side opposite the first side, the housing being attached to the first side of the first platform;
a set of actuators comprising a first actuator, a second actuator, and a third actuator, each of the first, second, and third actuators being connected to the second side of the first platform;
a second platform offset from the first platform, each of the first, second, and third actuators being connected to a first side of the second platform, said first side of the second platform facing the second side of the first platform;
a frame surrounding the second platform;
a fourth actuator; and
a fifth actuator, wherein
each of the first, second, and third actuators is configured such that each can be controlled to move the transceiver by moving along a first axis that is orthogonal to the first side of the second platform, thereby moving the first platform,
the fourth actuator is attached to the frame and is operable to displace the second platform along a second axis that is orthogonal to the first axis, and
the fifth actuator is attached to the frame and is operable to displace the second platform along a third axis that is orthogonal to the first axis and to the second axis.

### Claim 2 (depends on 1)

The apparatus of claim 1, further comprising:
a sixth actuator attached to a second side of the second platform opposite to the first side of the second platform, wherein the sixth actuator is operable to displace the second platform along the first axis, and wherein the first, second, and third actuators are operable to tilt the first platform relative to the second platform; and
a third platform offset from the second platform, wherein the sixth actuator is connected to the third platform.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein the first, second, and third actuators are located at vertices of an equiangular polygon.

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein the second side of the first platform is electrically conductive and is operable to be placed at a bias voltage.

### Claim 5 (depends on 1)

The apparatus of claim 1, wherein the frame has an inner perimeter and an outer perimeter, and wherein the frame is electrically conductive at the inner perimeter such that the inner perimeter can be placed at the bias voltage.

### Claim 6

An apparatus for positioning a reflector in a multi-layer circuit board relative to an optical transceiver, the circuit board having a layer for routing an optical signal, the apparatus comprising:
a first platform having a reflective first side;
a set of actuators comprising a first actuator, a second actuator, and a third actuator, each of the first, second, and third actuators being connected to a second side of the first platform that is opposite to the first side of the first platform;
a second platform offset from the first platform, each of the first, second, and third actuators being connected to a first side of the second platform, said first side of the second platform facing the second side of the first platform;
a frame surrounding the second platform;
a fourth actuator; and
a fifth actuator, wherein
each of the first, second, and third actuators is configured such that each can be controlled to move the first platform by moving along a first axis that is orthogonal to the first side of the second platform;
the fourth actuator is attached to the frame and is operable to displace the second platform along a second axis that is orthogonal to the first axis, and
the fifth actuator is attached to the frame and is operable to displace the second platform along a third axis that is orthogonal to the first axis and to the second axis.

### Claim 7 (depends on 6)

The apparatus of claim 6, wherein the set of actuators further comprises a sixth actuator and a seventh actuator that are each connected to the second side of the first platform and to the first side of the second platform.

### Claim 8 (depends on 6)

The apparatus of claim 6, wherein one of the set of actuators is located at a center of the second surface of the first platform.

### Claim 9 (depends on 8)

The apparatus of claim 8, wherein the remaining ones of the set of actuators are located at vertices of an equiangular polygon.

### Claim 10 (depends on 9)

The apparatus of claim 9, further comprising:
an eighth actuator attached to a second surface of the second platform opposite to the first surface of the second platform, wherein the eighth actuator is operable to displace the second platform along the first axis, and wherein the set of actuators is operable to tilt the first platform and is operable to bend the first platform; and
a third platform offset from the second platform, wherein the eighth actuator is attached to the third platform.

### Claim 11 (depends on 6)

The apparatus of claim 6, wherein the second side of the first platform is electrically conductive and is operable to be placed at a bias voltage.

### Claim 12 (depends on 11)

The apparatus of claim 11, wherein
the frame has an inner perimeter and an outer perimeter, and
the frame is electrically conductive at the inner perimeter such that the inner perimeter can be placed at the bias voltage.