Optical module with beam splitter on reflecting surface

Patent metadata

Field	Value
Publication number	US-9470857-B2
Application number	US-201414304486-A
Country	US
Kind code	B2
Filing date	Jun 13, 2014
Priority date	Jun 13, 2014
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

An optical module providing laser diodes (LD) and monitor PDs is disclosed. The LDs and monitor PDs are mounted on a module substrate that also mounts a resin body. The resin body includes a mirror surface which causes a total inner reflection for the optical beams coming from the LDs toward the inner fibers set in one side of the resin body. The mirror surface further provides a blip to refract portions of the optical beams toward the monitor PDs.

First claim

What is claimed is:

1. An optical module, comprising:
a substrate;
a semiconductor laser diode (LD) mounted on the substrate;
a monitor photodiode (PD) mounted on the substrate; and
a resin body mounted on the substrate, the resin body installing the LD and the monitor PD therein, the resin body providing a mirror surface making an angle of 45° against the substrate to cause a total inner reflection for an optical beam coming from the LD,
wherein the mirror surface includes at least one refracting surface that makes an angle less than 45° against the substrate, the refracting surface transmitting a portion of the optical beam coming from the LD and entering the mirror surface.

2. The optical module of claim 1 ,
wherein the mirror surface further includes a vertical surface extending in perpendicular to the substrate, the vertical surface and the refracting surface forming a triangular cross section.

3. The optical module of claim 2 ,
wherein the resin body further includes another refracting surface and a mirror,
wherein the mirror reflects the optical beam transmitting through the refracting surface toward the another refracting surface.

4. The optical module of claim 3 ,
wherein the another refracting surface makes an angle against the substrate substantially equal to the angle of the refracting surface against the substrate, and
wherein the optical beam refracted at the another refracting surface enters the monitor PD arranged neighbor to the LD.

5. The optical module of claim 3 ,
wherein the resin body provides a lens facing the LD, the lens collimating the optical beam coming from the LD.

6. The optical module of claim 3 ,
wherein the resin body provides another lens facing the monitor PD, the another lens concentrating the optical beam refracted by the another refracting surface onto the PD.

7. The optical module of claim 3 ,
wherein the mirror selectively reflects the optical beam having wavelengths corresponding to the LD.

8. The optical module of claim 2 ,
wherein the resin body further includes a support that mounts the monitor PD thereon.

9. The optical module of claim 1 ,
wherein the mirror surface includes two or more refracting surfaces,
wherein at least one refracting surface positions in a center of the optical beam of coming from the LD and projected on the mirror surface.

10. The optical module of claim 9 ,
wherein the refracting surfaces each has a distance to a neighbor refracting surface different from each other.

11. The optical module of claim 1 ,
wherein the resin body provides a guide pin and the substrate provides a hole that receives the guide pin, the guide pin set within the hole aligning the LD and the monitor PD with the refracting surface.

12. The optical module of claim 1 , further comprising one or more other LDs integrally formed with the LD in an arrayed structure, and, one or more other monitor PDs arranged along the arrayed LDs on the substrate,
wherein the refracting surface extends along an arrayed direction of the arrayed LD.

13. The optical module of claim 1 ,
wherein the LD has a type of a vertical cavity surface emitting laser diode (VCSEL).

Assignees

• Sumitomo Electric Industries

Inventors

• Shah Jignesh

Classifications

• 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

• G02B6/4286

  Optical modules with optical power monitoring · CPC title

• G02B6/4206

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

• G02B6/4292

  the light guide being disconnectable from the opto-electronic element, e.g. mutually self aligning arrangements · CPC title

• G02B6/4246 Primary

  Bidirectionally operating package structures · CPC title