Receiver optical sub-assembly, combo bi-directional optical sub- assembly, combo optical module, OLT, and PON system

Patent metadata

Field	Value
Publication number	US-11916600-B2
Application number	US-202117506266-A
Country	US
Kind code	B2
Filing date	Oct 20, 2021
Priority date	Dec 27, 2017
Publication date	Feb 27, 2024
Grant date	Feb 27, 2024

Abstract

A receiver optical sub-assembly, a combo bi-directional optical sub-assembly, a combo optical module, an optical line terminal, and a passive optical network system, where the receiver optical sub-assembly includes a first transistor-outline can, where a light incident hole is disposed on the first transistor-outline can, and where a first demultiplexer, a first optical receiver, a second optical receiver, and an optical lens combination are packaged in the first transistor-outline can.

First claim

What is claimed is:

1. A receiver optical sub-assembly comprising:
a first demultiplexer disposed on a direction in which light enters the receiver optical sub-assembly and configured to:
transmit a first optical signal of a first wavelength through a body of the first demultiplexer; and
reflect a second optical signal of a second wavelength from a surface of the first demultiplexer;

a first optical receiver disposed on a transmission optical path of the first demultiplexer and configured to receive the first optical signal of the first wavelength;
an optical lens combination disposed on a reflection optical path of the first demultiplexer and configured to:
receive the second optical signal of the second wavelength reflected by the first demultiplexer; and
guide the second optical signal of the second wavelength;

a second optical receiver configured to receive the second optical signal of the second wavelength from the optical lens combination;
a header; and
a cap disposed on the header,
wherein the first demultiplexer, the first optical receiver, the second optical receiver, and the optical lens combination are disposed inside the cap, and
wherein the first optical receiver and the second optical receiver are coupled to the header.

2. The receiver optical sub-assembly of claim 1 , further comprising a transparent support, wherein the transparent support includes a bottom plate and a roof plate, wherein the first demultiplexer is fastened on the bottom plate, and wherein the optical lens combination is fastened on the roof plate.

3. The receiver optical sub-assembly of claim 1 , wherein the optical lens combination comprises a refractor and at least one reflector, wherein the refractor is disposed on the reflection optical path of the first demultiplexer, and wherein the second optical signal enters the second optical receiver after being reflected by the at least one reflector.

4. The receiver optical sub-assembly of claim 3 , wherein the at least one reflector comprises a first reflector and a second reflector, wherein the refractor is disposed on the reflection optical path of the first demultiplexer, wherein the first reflector is disposed on a first refraction optical path of the refractor, and wherein the second reflector is disposed on a second reflection optical path of the first reflector.

5. The receiver optical sub-assembly of claim 4 , further comprising:
a first condenser lens and a first filter sequentially disposed on a receiving optical path of the first optical receiver in a light incident direction of the first optical receiver; and
a second condenser lens and a second filter sequentially disposed on a second receiving optical path of the second optical receiver in a second light incident direction of the second optical receiver.

6. The receiver optical sub-assembly of claim 5 , wherein the optical lens combination is an integrated optical prism comprising a refraction surface, a first reflection surface, and a second reflection surface disposed on the integrated optical prism, wherein the refraction surface is disposed on the reflection optical path of the first demultiplexer, wherein the first reflection surface is disposed on a refraction optical path of the refraction surface, wherein the second reflection surface is disposed on a third reflection optical path of the first reflection surface, and wherein a fourth reflection optical path of the second reflection surface coincides with the second receiving optical path of the second optical receiver.

7. The receiver optical sub-assembly of claim 6 , wherein the first condenser lens is a first light concentrating surface on a surface of the integrated optical prism, wherein the second condenser lens is a second light concentrating surface on the surface of the integrated optical prism, wherein the first light concentrating surface corresponds to the first optical receiver, and second light concentrating surface corresponds to the second optical receiver.

8. The receiver optical sub-assembly of claim 7 , wherein the first filter and the second filter are inserted into the integrated optical prism, wherein the first filter is located between the first light concentrating surface and the first optical receiver, and wherein the second filter is located between the second light concentrating surface and the second optical receiver.

9. The receiver optical sub-assembly of claim 6 , further comprising an installation surface disposed on the integrated optical prism, wherein the first demultiplexer is fastened on the installation surface, and wherein the reflection optical path of the first demultiplexer passes through the refraction surface.

10. The receiver optical sub-assembly of claim 6 ,
wherein the integrated optical prism is fastened on the header,
wherein an installation space exists between the integrated optical prism and the header, and
wherein the first optical receiver and the second optical receiver are disposed in the installation space and are coupled to the header.

11. The receiver optical sub-assembly of claim 10 , wherein the header is coupled to pins, and wherein electrical signal output ends of the first optical receiver and the second optical receiver are coupled to the pins using an amplifier.

12. The receiver optical sub-assembly of claim 1 , wherein the optical lens combination comprises at least one reflector, and wherein the second optical signal of the second wavelength enters the second optical receiver after being reflected by the at least one reflector.

13. The receiver optical sub-assembly of claim 1 , wherein the first optical receiver and the second optical receiver are disposed side by side, and wherein a receiving optical path of the first optical receiver is parallel to a second receiving optical path of the second optical receiver.

14. The receiver optical sub-assembly of claim 1 , wherein the first optical signal comprises a 1310-nanometer (nm) wavelength, and wherein the second optical signal comprises a 1270-nm wavelength.

15. The receiver optical sub-assembly of claim 1 , wherein the first optical signal comprises a 1270-nanometer (nm) wavelength, and wherein the second optical signal comprises a 1310-nm wavelength.

16. A combo bi-directional optical sub-assembly, comprising:
a housing;
an optical transmission channel disposed in the housing;
a second demultiplexer disposed on the optical transmission channel, wherein an optical receive port, an optical transmit port, and an optical fiber connection port are in communication with the optical transmission channel and disposed in the housing; and
a receiver optical sub-assembly comprising:
a first demultiplexer disposed on a direction in which light enters the receiver optical sub-assembly and configured to:
transmit a first optical signal of a first wavelength through a body of the first demultiplexer; and
reflect a second optical signal of a second wavelength from a surface of the first demultiplexer;

a first optical receiver disposed on a transmission optical path of the first demultiplexer and configured to receive the first optical signal of the first wavelength;
an optical lens combination disposed on a reflection optical path of the first demultiplexer and configured to:
receive the second optical signal of the second wavelength reflected by the first demultiplexer; and
guide the second optical signal of the second wavelength;

a second optical receiver configured to receive the second optical signal of the second wavelength from the optical lens combination;

a header; and
a cap disposed on the header,

Assignees

• Huawei Tech Co Ltd

Inventors

• Li Shu
• Cao Rixiang
• Wang Zelin
• Yang Sulin

Classifications

• H04J14/0305

  in end terminals · CPC title

• H04J14/02764

  Multiplex arrangements for radio-frequency networks access; policies therefor (radio over fibre arrangement H04B10/2575) · CPC title

• G02B6/4263

  of the transisitor outline [TO] can type · CPC title

• G02B6/4214

  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) · CPC title

• G02B6/29362

  Serial cascade of filters or filtering operations, e.g. for a large number of channels · CPC title