Micro bi-directional optical sub-assembly

Patent metadata

Field	Value
Publication number	US-9372315-B2
Application number	US-201314066001-A
Country	US
Kind code	B2
Filing date	Oct 29, 2013
Priority date	May 31, 2013
Publication date	Jun 21, 2016
Grant date	Jun 21, 2016

Abstract

A BOSA package comprising only one cylindrical TO package comprising a ROSA and a TOSA, and an optical port in optical communication with the ROSA and the TOSA. Also disclosed is a TO package comprising a TOSA for transmitting a first optical signal, a ROSA for receiving a second optical signal, an optical communication window, and a TFF positioned such that the first optical signal transmitted from the TOSA is reflected by the TFF toward the optical communication window and the second optical signal received from the optical communication window passes through the TFF and to the ROSA.

First claim

What is claimed is:

1. A bi-directional optical sub-assembly (BOSA) package comprising:
only one cylindrical transistor outline (TO) package comprising a receiver optical sub-assembly (ROSA), a transmitter optical sub-assembly (TOSA), a TO header, a thin film filter (TFT), and a combination part comprising a focusing lens, a slot, and a through hole: and
an optical port in optical communication with the ROSA and the TOSA,
wherein the TO header comprises a top surface,
wherein the TOSA and the ROSA are mounted on the top surface,
wherein the focusing lens and the through hole are in a first plane and adjacent to one another,
wherein the slot is in a second plane oriented at about ninety degrees to the first plane,
wherein the slot is angled at about forty-five degrees with respect to the first plane, and
wherein the TFF is positioned in the slot such that the TFF is between the optical port and the focusing lens, a first optical signal transmitted from the TOSA is reflected by the TFF toward the optical port, and a second optical signal received from the optical port passes through the TFF to the ROSA.

2. The BOSA package of claim 1 , wherein the TO package further comprises a TO cap affixed to the TO header.

3. The BOSA package of claim 2 , further comprising an aspheric lens positioned between the TO cap and the optical port, wherein the aspheric lens focuses the first optical signal transmitted by the TOSA towards the optical port, and wherein the aspheric lens collimates the second optical signal received from the optical port to the ROSA.

4. The BOSA package of claim 3 , further comprising a housing that couples to the optical port, wherein the housing encases the TO package and the aspheric lens.

5. The BOSA package of claim 4 , wherein the aspheric lens is made of a molded plastic resin, and wherein the aspheric lens is molded into the housing.

6. The BOSA package of claim 4 , wherein the housing and the optical port are made of a molded plastic resin, and wherein the housing and the optical port are bonded using an epoxy resin and not bonded by laser welding.

7. The BOSA package of claim 1 , wherein the TO package comprises a diameter of about seven millimeters or less.

8. The BOSA package of claim 1 , wherein the optical port comprises a fiber receptacle, wherein the fiber receptacle encases a split sleeve, wherein the split sleeve encases a ferrule that is configured to receive a single mode optical fiber.

9. The BOSA package of claim 1 , wherein the optical port comprises a fiber stub assembled with a single mode optical fiber.

10. A transistor outline (TO) package comprising:
a transmitter optical sub-assembly (TOSA) for transmitting a first optical signal;
a receiver optical sub-assembly (ROSA) for receiving a second optical signal;
an optical communication window;
a thin film filter (TFF) positioned such that the first optical signal transmitted from the TOSA is reflected by the TFF toward the optical communication window and the second optical signal received from the optical communication window passes through the TFF and to the ROSA; and
a combination part comprising a focusing lens, a slot, and a through hole,
wherein the focus in lens and the through hole are in a first plane and adjacent to one another,
wherein the slot is in a second plane oriented at about ninety degrees to the first plane,
wherein the slot is angled at about forty-five degrees with respect to the first plane,
wherein the TFF is positioned in the slot, and
wherein the combination part is positioned such that the TFF is between the optical communication window and the focusing lens.

11. The TO package of claim 10 , wherein the combination part is mechanically stabilized by a through pin extending through the through hole.

12. The TO package of claim 10 , wherein the combination part, the focusing lens, and the through hole are made of a molded plastic resin, and wherein the focusing lens and the through hole are molded into the first plane of the combination part.

13. The TO package of claim 10 , wherein the combination part further comprises a photodiode, wherein the photodiode is in the first plane, and wherein the TFF is coated such that a small portion of the first optical signal is transmitted through the TFF towards the photodiode.

14. The TO package of claim 10 , further comprising a collimating lens positioned between the TOSA and the TFF, wherein the TOSA is positioned such that the first optical signal transmitted by the TOSA is transmitted through the collimating lens and reflected by the TFF at about ninety degrees into the optical communication window, and wherein the ROSA is positioned such that the second optical signal is received from the optical communication window via the focusing lens and the TFF.

15. The TO package of claim 14 , further comprising a TO header and a TO cap affixed to the TO header, wherein the TO header comprises a top surface, wherein the TO header and the TO cap form a cavity that encases the ROSA, the TOSA, the collimating lens, the combination part, and the TO header, and wherein the combination part is mounted to the top surface of the TO header.

16. The TO package of claim 14 , wherein the collimating lens is a silicon lens or a ball lens, and wherein the collimating lens is positioned in a silicon v-groove.

17. A bi-directional optical sub-assembly (BOSA) package consisting essentially of:
a transistor outline (TO) header comprising a top surface;
a transmitter optical sub-assembly (TOSA) mounted to the top surface;
a receiver optical sub-assembly (ROSA) mounted to the top surface;
a combination part mounted to the top surface and comprising a focusing lens a slot, and a through hole;
a flat window TO cap affixed to the TO header;
an aspheric lens;
a thin film filter (TFF);
a plastic housing that encases the TO header, the TO cap, and the aspheric lens; and
an optical connector coupled to the plastic housing,
wherein the aspheric lens is positioned between the TO cap and the optical connector,
wherein the focusing lens and the through hole are in a first plane and adjacent to one another,
wherein the slot is in a second plane oriented at about ninety degrees to the first plane,
wherein the slot is angled at about forty-five degrees with respect to the first plane,
wherein the TFF is positioned in the slot, and
wherein the combination part is positioned such that the TIFF is between the optical connector and the focusing lens, a first optical signal transmitted from the TOSA is reflected by the TFF toward the optical connector, and a second optical signal received from the optical connector passes through the TFF to the ROSA.

18. The BOSA package of claim 17 , wherein the optical connector is a fiber receptacle or a fiber stub assembled with an optical fiber.

Assignees

• Futurewei Technologies Inc

Inventors

• Miao Rongsheng
• Bai Yu Sheng

Classifications

• G02B6/4263 Primary

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

• G02B6/421

  the intermediate optical component consisting of a short length of fibre, e.g. fibre stub · CPC title

• H04B10/40 Primary

  Transceivers · CPC title

• G02B6/4246

  Bidirectionally operating package structures · CPC title