Bidirectional optical transceiver module and method of aligning the same

Patent metadata

Field	Value
Publication number	US-9541714-B2
Application number	US-201514743469-A
Country	US
Kind code	B2
Filing date	Jun 18, 2015
Priority date	Jun 18, 2014
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

Disclosed are a bidirectional optical transceiver module and a method of aligning the same. The bidirectional optical transceiver module includes: a package having on one side a cavity; a platform mounted on the package; a transmitter which generates output light; a holder which includes the horizontal portion having the through-hole and disposed on the package to cover the cavity, and the vertical portion which has the inclined surface on one side and the connection hole connected to the through-hole; a receiver which generates an electric signal that corresponds to input light incident into the cavity; and a WDM filter that delivers the output light and the input light.

First claim

What is claimed is:

1. A bidirectional optical transceiver module, comprising:
a package which has on one side a cavity that is inwardly recessed and through which a plurality of lead wires pass;
a platform which is mounted on the package;
a transmitter which is mounted on one side of the platform and generates output light according to an electric signal transmitted through at least one of the plurality of lead wires;
a holder which includes the horizontal portion having a through-hole and disposed on the package to cover the cavity, and the vertical portion which has the inclined surface on one side and a connection hole connected to the through-hole, and which protrudes on the top of the horizontal portion;
a receiver which is mounted in the cavity, generates an electric signal that corresponds to input light that passes through the through-hole and the connection hole to be incident into the cavity, and outputs the generated electric signal through at least one of the plurality of lead wires; and
a wavelength division multiplexing (WDM) filter that is disposed on the inclined surface of the vertical portion to deliver the output light toward an optical fiber and to deliver the input light toward the connection hole and the through-hole.

2. The bidirectional optical transceiver module of claim 1 , wherein:
the through-hole has a smaller diameter than the connection hole; and
a convex lens having a spherical or aspherical shape is inserted into the connection hole, with one side of the convex lens being fitted into the through-hole.

3. The bidirectional optical transceiver module of claim 1 , wherein:
a step-shaped protrusion is formed on an upper side of the cavity by outwardly extending an inner diameter of the cavity; and
the horizontal portion is mounted on the step-shaped protrusion.

4. The bidirectional optical transceiver module of claim 1 , wherein:
a block filter, through which the input light passes after passing through the through-hole, is formed on an inner surface of the horizontal portion.

5. The bidirectional optical transceiver module of claim 4 , wherein a receiving groove, in which the block filter is received, is inwardly recessed on the inner surface of the horizontal portion.

6. The bidirectional optical transceiver module of claim 1 , wherein the horizontal portion and the vertical portion of the holder are detachable from each other.

7. The bidirectional optical transceiver module of claim 6 , wherein a housing groove is inwardly recessed on a bottom surface of the vertical portion, and the block filter is accommodated in the housing groove.

8. The bidirectional optical transceiver module of claim 1 , wherein a cap is formed on the top of the package to cover the platform, the transmitter, the holder, and the WDM filter, and includes an opening through which an optical signal is input or output.

9. The bidirectional optical transceiver module of claim 8 , wherein a collimating lens is mounted on the opening of the cap.

10. The bidirectional optical transceiver module of claim 1 , wherein an isolator is disposed between the transmitter and the WDM filter to deliver only the output light toward the WDM filter.

11. The bidirectional optical transceiver module of claim 1 , wherein a focusing lens is disposed between the transmitter and the WDM filter to focus the output light.

12. The bidirectional optical transceiver module of claim 1 , wherein a V-groove is formed at the other side of the platform, and the isolator or the focusing lens disposed between the transmitter and the WDM filter is mounted in the V-groove.

13. The bidirectional optical transceiver module of claim 1 , wherein the package has a platform mounting groove that is inwardly recessed at a position where the platform is mounted.

14. The bidirectional optical transceiver module of claim 1 , wherein a receiver mounting groove formed on the bottom surface of the cavity is inwardly recessed at a position where the receiver is mounted.

15. The bidirectional optical transceiver module of claim 1 , wherein:
a convex lens having a spherical or aspherical shape is formed on the bottom of the horizontal portion; and
an upper portion of the convex lens is accommodated in a mounting groove that is upwardly recessed from the bottom of the horizontal portion, so as to be connected to the through-hole.

16. A method of aligning a bidirectional optical transceiver module, the method is performed by the bidirectional optical transceiver module comprising: a package having on one side a cavity that is inwardly recessed and on the other side a platform mounting groove, wherein a receiver mounting groove is formed on the bottom surface of the cavity, and a plurality of lead wires pass through the package; a platform mounted on the package and having an alignment mark to align a transmitter; the transmitter mounted on one side of the platform and configured to generate output light according to an electric signal transmitted through at least one of the plurality of lead wires; a holder which includes the horizontal portion having a through-hole and disposed on the package to cover the cavity, and the vertical portion which has the inclined surface on one side and a connection hole connected to the through-hole, and which protrudes on the top of the horizontal portion; a receiver which is mounted in the cavity, generates an electric signal that corresponds to input light that passes through the through-hole and the connection hole to be incident into the cavity, and outputs the generated electric signal through at least one of the plurality of lead wires; and a WDM filter disposed on the inclined surface of the vertical portion and configured to deliver the output light toward the optical fiber and deliver the input light toward the connection hole and the through-hole,
wherein the method comprising:
mounting the receiver in the receiver mounting groove of the package;
mounting the transmitter in the platform according to the alignment mark formed on the platform;
mounting the platform in the platform mounting groove of the package; and
fixing the WDM filter by aligning the holder using a monitor of an optical microscope that is positioned on the same line as an optical axis of the receiver so as to overlap active areas of the transmitter and the receiver.

Assignees

• Electronics & Telecommunications Res Inst

Inventors

• Lim Kwon Seob
• Kang Hyun Seo
• Kim Keo Sik
• Kim Young Sun
• Kim Jae Hoon
• Park Hyoung Jun
• Jeon Eun Kyoung
• Heo Young Soon

Classifications

• H04J14/02

  Wavelength-division multiplex systems · CPC title

• G02B6/4201

  Packages, e.g. shape, construction, internal or external details · CPC title

• G02B6/4263

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

• Y10T29/49771

  Quantitative measuring or gauging · CPC title

• G02B6/4257

  having a supporting carrier or a mounting substrate or a mounting plate (G02B6/3648 takes precedence) · CPC title