Optical module, method for manufacturing optical module, and optical transceiver

Patent metadata

Field	Value
Publication number	US-9719848-B2
Application number	US-201414553478-A
Country	US
Kind code	B2
Filing date	Nov 25, 2014
Priority date	Jan 28, 2014
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

An optical module comprising: an optical waveguide transports light, the optical waveguide including a first mirror which reflects first light; an adhesive sheet formed over the optical waveguide, the adhesive sheet including a first gap above the first mirror; a first light-transmissive layer formed in the first gap; a lens sheet arranged over the adhesive sheet, the lens sheet including a first lens which is formed above the first light-transmissive layer; and a light-emitting device formed above the lens sheet, the light-emitting device including a light-emitting portion which emits the first light to the first lens.

First claim

What is claimed is:

1. An optical module comprising:
an optical waveguide to transport light, the optical waveguide including a first mirror to reflect first light;
an adhesive sheet formed over the optical waveguide, the adhesive sheet including a first gap above the first mirror, the adhesive sheet being formed in advance to have a uniform thickness;
a first light-transmissive layer formed in the first gap;
a lens sheet arranged over the adhesive sheet, the lens sheet including a first lens which is formed above the first mirror; and
a light-emitting device formed above the lens sheet, the light-emitting device including a light-emitting portion which emits the first light to the first lens.

2. The optical module according to claim 1 , further comprising:
a second mirror, to reflect second light, formed in the optical waveguide;
a second gap formed in the adhesive sheet above the second mirror;
a second light-transmissive layer formed in the second gap;
a second lens formed in the lens sheet above the second light-transmissive layer; and
a light-receiving device formed above the lens sheet, the light-receiving device including a light-receiving portion to receive the second light transmitted through the second lens.

3. The optical module according to claim 1 , wherein the adhesive sheet bonds the lens sheet and the optical waveguide by an adhesive surface being cured by heating.

4. The optical module according to claim 1 , wherein the adhesive sheet bonds the lens sheet and the optical waveguide by an adhesive surface being cured by ultraviolet radiation.

5. The optical module according to claim 1 , wherein the first light-transmissive layer is a resin that is cured by heating.

6. The optical module according to claim 1 , wherein the first light-transmissive layer is a resin that is cured by ultraviolet radiation.

7. A method for manufacturing an optical module comprising:
forming a first mirror on an optical waveguide by notching the optical waveguide;
forming an adhesive sheet to have a uniform thickness in advance;
forming a first gap in the adhesive sheet;
attaching the adhesive sheet onto the optical waveguide so that the first gap is at a position over the first mirror;
attaching a lens sheet that includes a first lens above the position where the first gap is formed onto the adhesive sheet; and
filling the first gap with a light-transmissive resin.

8. The method for manufacturing an optical module according to claim 7 , further comprising:
curing the light-transmissive resin by radiating ultraviolet ray above the lens sheet.

9. An optical transceiver comprising:
an optical waveguide to transport light, the optical waveguide including
a first mirror to reflect first light, and
a second mirror to reflect second light;

an adhesive sheet formed on the optical waveguide, the adhesive sheet being formed in advance to have a uniform thickness and the adhesive sheet including
a first gap above the first mirror, and
a second gap above the second mirror;

a first light-transmissive layer formed in the first gap;
a second light-transmissive layer formed in the second gap;
a lens sheet arranged over the adhesive sheet, the lens sheet including
a first lens which is formed above the first mirror, and
a second lens which is formed above the second mirror;

a light-emitting device formed above the lens sheet, the light-emitting device including a light-emitting portion to emit the first light to the first lens;
a light-receiving device formed above the lens sheet, the light-receiving device including a light-receiving portion to receive the second light transmitted through the second lens;
a controller supplies a drive current to the light-emitting device; and
an amplifier converts a current signal which is photoelectrically converted by the light-receiving device into a voltage signal.

Assignees

• Fujitsu Ltd

Inventors

• Kainuma Norio
• Kubota Takashi

Classifications

• G01J1/0252

  Constructional arrangements for compensating for fluctuations caused by, e.g. temperature, or using cooling or temperature stabilization of parts of the device; Controlling the atmosphere inside a photometer; Purge systems, cleaning devices (protection against electromagnetic interferences G01J2001/0276) · CPC title

• G01J1/0411

  using focussing or collimating elements, i.e. lenses or mirrors; Aberration correction · CPC title

• G02B6/428

  containing printed circuit boards [PCB] · CPC title

• G02B6/4212

  the intermediate optical element being a coupling medium interposed therebetween, e.g. epoxy resin, refractive index matching material, index grease, matching liquid or gel · CPC title

• G01J1/0414

  using plane or convex mirrors, parallel phase plates, or plane beam-splitters · CPC title