IP Library › Granted Patent US 12674945
Granted Patent B2
US 12674945 · App. 18/647,242 · Granted Jul 7, 2026

Light-emitting assembly and optical communication apparatus

Inventors: Xiaokang Xiao (Dongguan, CN); Yuejing Qin (Dongguan, CN); Ying Guo (Shenzhen, CN)
Assignee: Huawei Technologies Co., Ltd.
G02B6/425G02B6/3652G02B6/4213G02B6/4214G02B6/423G02B6/43H01S5/005H01S5/4025
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Quick Facts
Patent No.
US 12674945
App. No.
18/647,242
Granted
Jul 7, 2026
Kind
B2
Abstract

A light-emitting assembly includes a laser, an optical isolator, and a polarization maintaining device. The laser is configured to emit a first optical signal; the polarization maintaining device is configured to receive a second optical signal; and the optical isolator includes a polarizer and an optical rotator. The laser, the polarizer, the optical rotator, and the polarization maintaining device are sequentially arranged, a polarization direction of the polarizer is the same as a polarization direction of the first optical signal, and the optical rotator is configured to deflect the first optical signal into the second optical signal.

Claims (60)

1 . A light-emitting assembly, comprising:

a laser configured to emit a first optical signal;

a polarization maintaining device configured to receive a second optical signal; and

an optical isolator comprising a polarizer and an optical rotator, wherein the laser, the polarizer, the optical rotator, and the polarization maintaining device are sequentially arranged, a polarization direction of the polarizer is the same as a polarization direction of the first optical signal, and the optical rotator is configured to deflect the first optical signal into the second optical signal.

2 . The light-emitting assembly according to claim 1 , wherein no polarization analyzer exists between the optical rotator and the polarization maintaining device.

3 . The light-emitting assembly according to claim 1 , wherein an included angle between the polarization direction of the first optical signal and a polarization direction of the second optical signal ranges from 40 degrees to 50 degrees.

4 . The light-emitting assembly according to claim 1 , wherein:

the polarizer is attached to the optical rotator;

one side of the polarizer that is away from the optical rotator faces the laser, and is configured to be optically coupled to the laser; and

one side that is of the optical rotator and that is away from the polarizer faces the polarization maintaining device, and is configured to be optically coupled to the polarization maintaining device.

5 . The light-emitting assembly according to claim 1 , wherein:

a third optical signal reflected by the polarization maintaining device is configured to be coupled to the optical rotator; and

the optical rotator is configured to deflect the third optical signal into a fourth optical signal, wherein a polarization direction of the fourth optical signal is configured to be perpendicular to the polarization direction of the polarizer.

6 . The light-emitting assembly according to claim 1 , wherein the polarization maintaining device comprises:

a substrate having a plurality of grooves on one side, wherein the plurality of grooves are sequentially arranged at intervals; and

a plurality of polarization maintaining optical fibers, wherein the polarization maintaining optical fibers are inserted into corresponding grooves in a one-to-one correspondence, and one end of each polarization maintaining optical fiber is coupled to the optical isolator.

7 . The light-emitting assembly according to claim 6 , wherein the laser comprises:

a base; and

a plurality of light-emitting units sequentially arranged at intervals and connected to the base, wherein the light-emitting units are in a one-to-one correspondence with the polarization maintaining optical fibers, and the light-emitting units are arranged opposite to corresponding polarization maintaining optical fibers.

8 . The light-emitting assembly according to claim 7 , further comprising:

a first lens array located between the laser and the optical isolator, wherein lens units of the first lens array are in a one-to-one correspondence with the light-emitting units, and each lens unit of the first lens array is separately coupled to the optical isolator and a corresponding light-emitting unit.

9 . The light-emitting assembly according to claim 7 , further comprising:

a second lens array located between the polarization maintaining device and the optical isolator, wherein lens units of the second lens array are in a one-to-one correspondence with the polarization maintaining optical fibers, and each lens unit of the second lens array is separately coupled to the optical isolator and a corresponding polarization maintaining optical fiber.

10 . The light-emitting assembly according to claim 1 , wherein the polarization maintaining device comprises:

a first optical waveguide extending along a light output direction of the optical isolator, wherein an end of the first optical waveguide is coupled to the optical isolator.

11 . The light-emitting assembly according to claim 10 , further comprising:

a first lens, wherein the first lens is located between the first optical waveguide and the optical isolator, and the first lens is separately coupled to the first optical waveguide and the optical isolator; or

the first lens is located between the laser and the optical isolator, and the first lens is separately coupled to the laser and the optical isolator.

12 . The light-emitting assembly according to claim 1 , wherein the polarization maintaining device comprises:

a second optical waveguide, wherein an included angle exists between the second optical waveguide and a light output direction of the optical isolator; and

a reflector located in the light output direction of the optical isolator, to couple the optical isolator to the second optical waveguide.

13 . The light-emitting assembly according to claim 12 , further comprising:

a second lens, wherein the second lens is located between the reflector and the optical isolator, and the second lens is separately coupled to the reflector and the optical isolator; or

the second lens is located between the laser and the optical isolator, and the second lens is separately coupled to the laser and the optical isolator.

14 . An optical communication apparatus, comprising:

a board;

a receive port;

a transmit port;

an onboard optical component; and

a light-emitting assembly comprising:

a laser configured to emit a first optical signal,

a polarization maintaining device configured to receive a second optical signal, and

an optical isolator comprising a polarizer and an optical rotator, wherein the laser, the polarizer, the optical rotator, and the polarization maintaining device are sequentially arranged, a polarization direction of the polarizer is the same as a polarization direction of the first optical signal, and the optical rotator is configured to deflect the first optical signal into the second optical signal, wherein

the receive port, the transmit port, the onboard optical component, and the light-emitting assembly are all connected to the board, and the receive port, the transmit port, and the light-emitting assembly are separately coupled to the onboard optical component.

15 . The optical communication apparatus according to claim 14 , wherein:

a third optical signal reflected by the polarization maintaining device is configured to be coupled to the optical rotator; and

the optical rotator is configured to deflect the third optical signal into a fourth optical signal, wherein a polarization direction of the fourth optical signal is configured to be perpendicular to the polarization direction of the polarizer.

16 . The optical communication apparatus according to claim 14 , wherein the polarization maintaining device comprises:

a substrate having a plurality of grooves on one side, wherein the plurality of grooves are sequentially arranged at intervals; and

a plurality of polarization maintaining optical fibers, wherein the polarization maintaining optical fibers are inserted into corresponding grooves in a one-to-one correspondence, and one end of each polarization maintaining optical fiber is coupled to the optical isolator.

17 . A method for operating a light-emitting assembly, the light-emitting assembly comprising a laser, an optical isolator, and a polarization maintaining device, the method comprising:

emitting, by the laser, a first optical signal;

receiving, by the polarization maintaining device, a second optical signal; and

deflecting, by an optical rotator of the optical isolator, the first optical signal into the second optical signal, wherein

the optical isolator comprises a polarizer and the optical rotator,

the laser, the polarizer, the optical rotator, and the polarization maintaining device are sequentially arranged, and

a polarization direction of the polarizer is the same as a polarization direction of the first optical signal.

18 . The method according to claim 17 , further comprising:

coupling a third optical signal reflected by the polarization maintaining device to the optical rotator; and

deflecting, by the optical rotator, the third optical signal into a fourth optical signal, wherein a polarization direction of the fourth optical signal is perpendicular to the polarization direction of the polarizer.