Optical module

Patent metadata

Field	Value
Publication number	US-2020285004-A1
Application number	US-201916496354-A
Country	US
Kind code	A1
Filing date	Aug 19, 2019
Priority date	Aug 17, 2018
Publication date	Sep 10, 2020
Grant date	—

Abstract

The present application provides an optical module, including a laser, a laser driving chip, and a lens component disposed above the laser and the laser driving chip, where an inner cavity wall of the lens component that faces towards the laser and the laser driving chip is provided with a transmitting lens; a surface of the transmitting lens and the inner cavity wall around the transmitting lens are coated with a reflective film; and there is no reflective film coated on a part or entire of a region, of the inner cavity wall of the lens unit, which is irradiated by a secondarily reflected laser light.

First claim

1 . An optical module, comprising:
a laser and a laser driving chip that are disposed on a circuit board, and a lens component disposed above the laser and the laser driving chip, wherein the lens component is provided with a transmitting lens for collimating and converging laser light emitted by the laser on an inner cavity wall of the lens component that faces towards the laser and the laser driving chip, and a surface of the transmitting lens and the inner cavity wall around the transmitting lens are coated with a reflective film; the laser driving chip is provided with a clock data recovery circuit in a non-edge region thereof, and the optical module is configured to reflect, by the reflective film on the surface of the transmitting lens, a part of the laser light emitted by the laser, and reflect secondarily, by an edge region of the laser driving chip, the laser light reflected by the reflective film to be irradiated onto the inner cavity wall of the lens unit, wherein there is no reflective film coated on a pan or entire of a region, of the inner cavity wall of the lens unit, which is irradiated by the secondarily reflected laser light.

2 . The optical module according to claim 1 , wherein a distance between a boundary, of the reflective film on a side closer to the laser driving chip, and a center of the transmitting lens is 0.5˜2.5 mm.

3 . The optical module according to claim 1 , wherein the clock data recovery circuit is disposed in a central region of the laser driving chip.

4 . The optical module according to claim 1 , wherein a distance between the laser driving chip and a center of the laser is greater than or equal to f(R, f 1 , θ),
wherein

f


(

R
,

f
1

,
θ

)

=

f
1


sin

2


θ
2

cos


(

2


θ
2

-
θ

)


cos

θ

,



θ
2

=

θ
+

arctan


f
1


tan

θ

R

,

R indicates a curvature radius of the transmitting lens, f 1 indicates a distance between the surface of the transmitting lens and a light-emitting cavity surface of the laser, and θ indicates a maximum divergence angle of the laser.

5 . The optical module according to claim 1 , wherein a region of the laser driving chip where the clock data recovery circuit is located is coated with a high-reflectivity film.

6 . An optical module, comprising:
a laser and a laser driving chip that are disposed on a circuit board, and a lens component disposed above the laser and the laser driving chip, wherein the lens component is provided with a transmitting lens for collimating and converging laser light emitted by the laser on an inner cavity wall of the lens component that faces towards the laser and the laser driving chip, and a surface of the transmitting lens and the inner cavity wall around the transmitting lens are coated with a reflective film; the laser driving chip is provided with a clock data recovery circuit in a non-edge region thereof, and the optical module is configured to reflect, by the reflective film on the surface of the transmitting lens, a part of the laser light emitted by the laser, and reflect secondarily, by an edge region of the laser driving chip, the laser light reflected by the reflective film to be irradiated onto the inner cavity wall of the lens unit; and a distance between a boundary of the reflective film on a side closer to the laser driving chip and a center of the transmitting lens is less than f(h 1 , R, f 1 , θ),
wherein

f


(

h
1

,
R
,

f
1

,
θ

)

=

h
1

*

sin


(

2


θ
2

-
θ

)


cos

θ

+

f
1


sin

2


θ
2

cos


(

Assignees

• Hisense Broadband Multimedia Technology Co Ltd

Inventors

• Liu Xuxia
• Ben Shijian

Classifications

• G02B6/4206 Primary

  Optical features (G02B6/4207, G02B6/421 take precedence) · CPC title

• G02B6/4214 Primary

  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) · CPC title

• G02B6/4204 Primary

  the coupling comprising intermediate optical elements, e.g. lenses, holograms (encapsulated active devices H01S5/02208) · CPC title

• H04B10/503

  Laser transmitters · CPC title

• H04B10/40

  Transceivers · CPC title