Receiver optical sub-assembly, bi-directional optical sub-assembly, optical module, and optical network device

Patent metadata

Field	Value
Publication number	US-12470303-B2
Application number	US-202318491572-A
Country	US
Kind code	B2
Filing date	Oct 20, 2023
Priority date	Jun 21, 2019
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

This application provides example receiver optical sub-assemblies, example bi-directional optical sub-assemblies, and example optical network devices. One example receiver optical sub-assembly includes a photodiode, a trans-impedance amplifier, and a first filter component. The photodiode is configured to convert an optical signal into an electrical signal, a positive electrode of the photodiode is connected to an input terminal of the trans-impedance amplifier, and a negative electrode of the photodiode is configured to connect to a power supply. The trans-impedance amplifier is configured to amplify the electrical signal output by the photodiode, where a power terminal of the trans-impedance amplifier is configured to connect to a power supply, and a first ground terminal of the trans-impedance amplifier is configured to connect to an external ground.

First claim

What is claimed is:

1 . A receiver optical sub-assembly, comprising a photodiode, a trans-impedance amplifier, a first filter component, and a second filter component, wherein:
the photodiode is configured to convert an optical signal into an electrical signal, a positive electrode of the photodiode is connected to an input terminal of the trans-impedance amplifier, and a negative electrode of the photodiode is connected to a first power supply; the trans-impedance amplifier is configured to amplify the electrical signal output by the photodiode, a power terminal of the trans-impedance amplifier is connected to a second power supply, and a first ground terminal of the trans-impedance amplifier is connected to an external ground; a second ground terminal of the trans-impedance amplifier is connected to the external ground by using the first filter component; and a first terminal of the second filter component is connected to the negative electrode of the photodiode, and a second terminal of the second filter component is connected to the first terminal of the first filter component.

2 . The receiver optical sub-assembly according to claim 1 , wherein a first terminal of the first filter component is connected to the second ground terminal of the trans-impedance amplifier, and a second terminal of the first filter component is connected to the external ground.

3 . The receiver optical sub-assembly according to claim 1 , further comprising a base, wherein the base is connected to the external ground, the first ground terminal of the trans-impedance amplifier is connected to the external ground through the base, and a second terminal of the first filter component is connected to the external ground through the base.

4 . The receiver optical sub-assembly according to claim 1 , further comprising a third filter component, wherein a first terminal of the third filter component is connected to the power terminal of the trans-impedance amplifier, and a second terminal of the third filter component is connected to the second ground terminal of the trans-impedance amplifier.

5 . The receiver optical sub-assembly according to claim 4 , further comprising a fourth filter component, wherein a first terminal of the fourth filter component is connected to the second terminal of the third filter component, and a second terminal of the fourth filter component is connected to the external ground.

6 . The receiver optical sub-assembly according to claim 1 , further comprising a fifth filter component, wherein a first terminal of the fifth filter component is connected to the power terminal of the trans-impedance amplifier, and a second terminal of the fifth filter component is connected to the external ground.

7 . The receiver optical sub-assembly according to claim 1 , further comprising a sixth filter component, wherein a first terminal of the sixth filter component is connected to the negative electrode of the photodiode, and a second terminal of the sixth filter component is connected to the external ground.

8 . The receiver optical sub-assembly according to claim 1 , wherein a capacitance of the first filter component is greater than 100 picofarads (pF).

9 . The receiver optical sub-assembly according to claim 1 , wherein a scattering parameter of the first filter component on a crosstalk signal frequency band is greater than 20 decibels (dB).

10 . The receiver optical sub-assembly according to claim 1 , wherein the first filter component comprises a capacitor.

11 . The receiver optical sub-assembly according to claim 1 , wherein the second ground terminal of the trans-impedance amplifier comprises an input stage ground terminal of the trans-impedance amplifier.

12 . The receiver optical sub-assembly according to claim 1 , wherein the first power supply and the second power supply are a same outside power supply.

13 . The receiver optical sub-assembly according to claim 1 , wherein the first power supply and the second power supply are different outside power supplies.

14 . The receiver optical sub-assembly according to claim 1 , wherein the power terminal of the trans-impedance amplifier is connected to an outside power supply, the trans-impedance amplifier comprises a voltage regulator, the voltage regulator is connected to the power terminal of the trans-impedance amplifier, and the negative electrode of the photodiode is connected to the voltage regulator.

15 . A bi-directional optical sub-assembly comprising a receiver optical sub-assembly, wherein the receiver optical sub-assembly comprises a photodiode, a trans-impedance amplifier, a first filter component, and a second filter component, wherein:
the photodiode is configured to convert an optical signal into an electrical signal, a positive electrode of the photodiode is connected to an input terminal of the trans-impedance amplifier, and a negative electrode of the photodiode is connected to a first power supply; the trans-impedance amplifier is configured to amplify the electrical signal output by the photodiode, a power terminal of the trans-impedance amplifier is connected to a second power supply, and a first ground terminal of the trans-impedance amplifier is connected to an external ground; a second ground terminal of the trans-impedance amplifier is connected to the external ground by using the first filter component; and a first terminal of the second filter component is connected to the negative electrode of the photodiode, and a second terminal of the second filter component is connected to the first terminal of the first filter component.

16 . An optical sub-assembly comprising a bi-directional optical sub-assembly, wherein the bi-directional optical sub-assembly comprises a receiver optical sub-assembly, wherein the receiver optical sub-assembly comprises a photodiode, a trans-impedance amplifier, a first filter component, and a second filter component, wherein:
the photodiode is configured to convert an optical signal into an electrical signal, a positive electrode of the photodiode is connected to an input terminal of the trans-impedance amplifier, and a negative electrode of the photodiode is connected to a first power supply; the trans-impedance amplifier is configured to amplify the electrical signal output by the photodiode, a power terminal of the trans-impedance amplifier is connected to a second power supply, and a first ground terminal of the trans-impedance amplifier is connected to an external ground; a second ground terminal of the trans-impedance amplifier is connected to the external ground by using the first filter component; and a first terminal of the second filter component is connected to the negative electrode of the photodiode, and a second terminal of the second filter component is connected to the first terminal of the first filter component.

17 . An optical network device comprising an optical sub-assembly, wherein the optical sub-assembly comprises a bi-directional optical sub-assembly, wherein the bi-directional optical sub-assembly comprises a receiver optical sub-assembly, wherein the receiver optical sub-assembly comprises a photodiode, a trans-impedance amplifier, a first filter component, and a second filter component, wherein:
the photodiode is configured to convert an optical signal into an electrical signal, a positive electrode of the photodiode is connected to an input terminal of the trans-impedance amplifier, and a negative electrode of the photodiode is connected to a first power supply; the trans-impedance amplifier is configured to amplify the elect

Assignees

• Huawei Tech Co Ltd

Inventors

• Cao Rixiang
• Xiong Yu
• Wang Zelin
• Yu Zhe

Classifications

• H04B10/697

  Arrangements for reducing noise and distortion · CPC title

• H04B10/691

  Arrangements for optimizing the photodetector in the receiver · CPC title

• H04B10/40

  Transceivers · CPC title

• H03F3/08

  controlled by light · CPC title

• H03F3/45475

  using IC blocks as the active amplifying circuit · CPC title