Communication device

Patent metadata

Field	Value
Publication number	US-9723386-B1
Application number	US-201414269385-A
Country	US
Kind code	B1
Filing date	May 5, 2014
Priority date	May 5, 2014
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

A communication system includes a transparent refractive optical wedge, a steerable mirror, a position feedback device, and a transceiver. The transparent refractive optical wedge has first and second faces angled with respect to each other and receives first and second optical signals through both the first and second faces. The first and second optical signals travel along parallel or common paths through the first face and diverge at a deflection angle with respect to each other through the second face. The steerable mirror is in optical communication with the first face of the optical wedge, the position feedback device, and the transceiver. The position feedback device adjusts a position of the steerable mirror to maintain the alignment of the reflected signal with the position feedback device. The transceiver has an optical transmitter transmitting one of the optical signals and an optical receiver receiving the other optical signal.

First claim

What is claimed is:

1. A communication system comprising:
a transparent refractive optical wedge having first and second faces angled with respect to each other for receiving a first optical signal through the optical wedge from the first face to the second face and a second optical signal through the optical wedge from the second face to the first face, the first and second faces arranged so that the first optical signal exiting the second face of the optical wedge diverges at a deflection angle with respect to the second optical signal travelling toward the second face of the optical wedge and the second optical signal exiting the first face of the optical wedge travels along a parallel or common path with respect to the first optical signal traveling toward the first face of the optical wedge;
a steerable mirror in optical communication with the first face of the optical wedge, the first and second optical signals travelling along the parallel or common path between the steerable mirror and the first face of the optical wedge;
a position feedback device in optical communication with the steerable mirror, the position feedback device sensing an alignment with the position feedback device of the second optical signal reflecting off of the steerable mirror and adjusting a position of the steerable mirror to maintain the alignment of the reflected second optical signal with the position feedback device; and
a transceiver in optical communication with the steerable mirror, the transceiver having an optical transmitter transmitting the first optical signal and an optical receiver receiving the second optical signal.

2. The communication system of claim 1 , wherein the first and second optical signals travel along a common path between the transceiver and the first face of the optical wedge.

3. The communication system of claim 1 , wherein the optical wedge causes the first optical signal exiting the second face of the optical wedge to travel along a first path away from the second face of the optical wedge at the deflection angle with respect to a second path of the second optical signal travelling toward the second face of the optical wedge before the second optical signal passes through the optical wedge.

4. The communication system of claim 1 , wherein the deflection angle equals between 0 degrees and about 0.1 degrees.

5. The communication system of claim 1 , wherein the optical wedge comprises a fused silica wedge and the first and second faces are angled with respect to each other by an angle of between about 12 degrees and about 16 degrees.

6. The communication system of claim 1 , wherein the optical wedge has an incidence angle on both surfaces of up to about 20 degrees.

7. The communication system of claim 1 , further comprising a signal splitter in optical communication with the steerable mirror, the position feedback device, and the transceiver, the signal splitter arranged to split one the signals travelling from the steerable mirror to the signal splitter and direct a portion of the split signal to the position feedback device and direct a remaining portion of the split signal to the transceiver.

8. The communication system of claim 7 , further comprising an optical lens arranged to focus the portion of the split signal travelling from the signal splitter to the position feedback device.

9. The communication system of claim 7 , further comprising an optical lens arranged to focus the optical signals travelling between the signal splitter and the transceiver.

10. The communication system of claim 9 , further comprising an optical fiber in optical communication with the transceiver, the optical lens directing the optical signals between a tip of the optical fiber and the signal splitter.

11. The communication system of claim 10 , further comprising a wavelength division multiplexer optically coupled to the optical fiber and in optical communication with the transceiver.

12. The communication system of claim 1 , further comprising a telescope in optical communication with the optical wedge and arranged to focus the signals travelling to and from the second face of the optical wedge.

13. The communication system of claim 1 , wherein the position feedback device comprises an image sensor.

14. The communication system of claim 1 , wherein the first and second optical signals have a wavelength separation of about 20 nm.

15. The communication system of claim 1 , wherein the optical signals received through optical wedge are collimated.

16. A method comprising:
receiving first and second optical signals through a transparent refractive optical wedge having first and second faces angled with respect to each other, the first optical signal received through the optical wedge from the first face to the second face and the second optical signal received through the optical wedge from the second face to the first face, the first and second faces arranged so that the first optical signal exiting the second face of the optical wedge diverges at a deflection angle with respect to the second optical signal travelling toward the second face of the optical wedge and the second optical signal exiting the first face of the optical wedge travels along a parallel or common path with respect to the first optical signal traveling toward the first face of the optical wedge; and
directing the first and second optical signals along parallel or common paths between a transceiver and the first face of the optical wedge, the transceiver having an optical transmitter transmitting the first optical signal and an optical receiver receiving the second optical signal.

17. The method of claim 16 , wherein the optical wedge causes the first optical signal exiting the second face of the optical wedge to travel along a first path away from the second face of the optical wedge at the deflection angle with respect to a second path of the second optical signal travelling toward the second face of the optical wedge before the second optical signal passes through the optical wedge.

18. The method of claim 16 , wherein directing the first and second optical signals comprises:
transmitting the first optical signal through an optical fiber optically coupled to the transmitter and to a signal splitter in optical communication with the optical fiber;
arranging the signal splitter to direct the first optical signal onto a steerable mirror in optical communication with the signal splitter and the first face of the optical wedge; and
arranging the steerable mirror to direct the first optical signal onto the first face of the optical wedge.

19. The method of claim 16 , wherein directing the first and second optical signals comprises:
arranging a steerable mirror to receive the second optical signal through the optical wedge and reflect the second optical signal to a signal splitter in optical communication with the steerable mirror; and
arranging the signal splitter to split the second optical signal travelling from the steerable mirror to the signal splitter and direct a portion of the split signal to a position feedback device and a remaining portion of the split signal to the transceiver.

20. The method of claim 19 , further comprising arranging the signal splitter to direct the remaining portion of the split signal into an optical fiber optically coupled to the transceiver.

21. The method of claim 19 , further comprising focusing the portion of the split signal travelling from the signal splitter to the position feedback device.

Assignees

• Google Inc

Inventors

• Ni Melvin Sze-ming
• Wang Chiachi

Classifications

• H04Q2011/0016

  using wavelength multiplexing or demultiplexing · CPC title

• H04B10/1129 Primary

  Arrangements for outdoor wireless networking of information · CPC title

• H04Q11/0066

  Provisions for optical burst or packet networks · CPC title

• H04Q11/0005 Primary

  Switch and router aspects · CPC title

• H04Q2011/0026

  using free space propagation (e.g. lenses, mirrors) · CPC title