Optical transmitter

Patent metadata

Field	Value
Publication number	US-11901946-B2
Application number	US-202117779673-A
Country	US
Kind code	B2
Filing date	Jun 11, 2021
Priority date	Jun 12, 2020
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

An optical transmitter according to one embodiment includes a housing with an emission end, a light emitting element mounted on a first mounting portion of the housing, and a light receiving element mounted on a second mounting portion of the housing to monitor output light from the light emitting element. The second mounting portion is provided with a carrier, a first resin located on an emission end side of a lower side of the carrier, and a second resin located on a light emitting element side of the lower side of the carrier. A coefficient of thermal expansion of the first resin is smaller than a coefficient of thermal expansion of the second resin.

First claim

The invention claimed is:

1. An optical transmitter comprising:
a housing with an emission end;
a light emitting element mounted on a first mounting portion of the housing; and
a light receiving element mounted on a second mounting portion of the housing to monitor output light from the light emitting element,
wherein the second mounting portion is provided with a carrier, a first resin located on an emission end side of a lower side of the carrier, and a second resin located on a light emitting element side of the lower side of the carrier, and
wherein a coefficient of thermal expansion of the first resin is smaller than a coefficient of thermal expansion of the second resin.

2. The optical transmitter according to claim 1 , wherein a mounting surface of the light receiving element of the second mounting portion is disposed so as to be inclined with respect to the optical axis of the output light from the light emitting element.

3. The optical transmitter according to claim 2 , comprising:
a plurality of the light emitting elements; and
a plurality of the light receiving elements provided corresponding to the respective plurality of the light emitting elements,
wherein optical path lengths of a plurality of the output lights from the plurality of light emitting element to the plurality of light receiving element are different from each other, and
wherein an angle of the mounting surface that mounts the light receiving element that receives the output light having a small optical path length is larger than an angle of the mounting surface that mounts the light receiving element that receives the output light having a large optical path length.

4. The optical transmitter according to claim 1 , wherein a height of the second resin is larger than a height of the first resin.

5. The optical transmitter according to claim 1 , wherein the carrier is made of glass or a material containing an alloy of iron, chromium, and nickel.

6. The optical transmitter according to claim 1 , wherein the coefficient of thermal expansion of the first resin and the coefficient of thermal expansion of the second resin are larger than a coefficient of thermal expansion of the carrier.

7. The optical transmitter according to claim 1 ,
wherein the housing includes a recess having a bottom portion at a position lower than a main surface of the housing, and
wherein the bottom surface of the carrier of the second mounting portion is mounted on the bottom portion of the recess.

Assignees

• Sumitomo Electric Industries
• Sedi Inc

Inventors

• Yoshimura Satoshi
• Hara Hiroshi
• Tsumura Eiji
• Kawamura Masanobu

Classifications

• H10F77/00

  Constructional details of devices covered by this subclass (constructional details of integrated devices, or assemblies of multiple devices, comprising at least one element in which radiation controls the flow of current H10F39/00) · CPC title

• H04B10/501 Primary

  Structural aspects · CPC title

• G02B6/4286 Primary

  Optical modules with optical power monitoring · CPC title

• G02B7/008

  with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation · CPC title

• H04B10/564

  Power control · CPC title