Coherent receiver module

Patent metadata

Field	Value
Publication number	US-2019327000-A1
Application number	US-201916388020-A
Country	US
Kind code	A1
Filing date	Apr 18, 2019
Priority date	Apr 19, 2018
Publication date	Oct 24, 2019
Grant date	—

Abstract

The receiver including a package, first and second optical fibers, a capillary, and an array lens is disclosed. The first fiber has a first edge coupling to a MMI device by propagating a signal beam. The second fiber has a second edge coupling to the MMI device by propagating a local beam. The array lens has first and second lenses. The first lens converts the signal beam into a collimating beam, and the second lens converts the local beam into a collimating beam. The capillary has an edge opposite to the array lens, and the edge has a first region including the first edge and a second region including the second edge. The first edge is slanted to a first axis, and the second edge is slanted to a second axis, and a direction of the first edge and a direction of the second edge are different each other.

First claim

What is claimed is:

1 . A receiver comprising:
a package housing a multi-mode interference (MMI) device; a first optical fiber having a first edge coupling to the MMI device by propagating a signal beam, and inserted into inside from outside of the package; a second optical fiber having a second edge coupling to the MMI device by propagating a local beam, and inserted into inside from outside of the package along with the first optical fiber; a capillary holding heads of the first and second optical fibers, and housed in the package; and an array lens having a first lens, a second lens, and a connection fixing the first lens and the second lens, wherein the first lens converts the signal beam into a first collimating beam and is located on a first optical axis of the first optical fiber, and the second lens converts the local beam into a second collimating beam and is located on a second optical axis of the second optical fiber; wherein the capillary has an edge opposite to the array lens, and the edge has a first region including the first edge and a second region including the second edge, wherein the first edge is slanted to the first optical axis, and the second edge is slanted to the second optical axis, and a direction of the first edge and a direction of the second edge are different each other.

2 . The receiver according to claim 1 , wherein a vector of the first region and a vector of the second region are oriented in such a way as to approach each other.

3 . The receiver according to claim 1 , wherein a vector of the first region and a vector of the second region are oriented in such a way as to point away from each other.

4 . The receiver according to claim 1 , wherein the first region and the second region are perpendicular to a virtual surface including the respective axes of the first fiber and the second fiber.

5 . The receiver according to claim 1 ,
wherein the capillary and the array lens are arranged on a deployment surface of a base housed in the package; and wherein heights of the respective axes of the first optical fiber and the second optical fiber using a surface of the capillary facing the deployment surface as a reference and heights of the respective axes of the first lens and the second lens using a surface of the array lens facing the deployment surface as a reference are equal to each other.

Assignees

• Sumitomo Electric Industries

Inventors

• Kurokawa Munetaka
• Fujimura Yasushi

Classifications

• G02B27/141 Primary

  using dichroic mirrors · CPC title

• H04B10/614 Primary

  comprising one or more polarization beam splitters, e.g. polarization multiplexed [PolMux] X-PSK coherent receivers, polarization diversity heterodyne coherent receivers (H04J14/06 takes precedence) · CPC title

• H04B10/6151

  comprising a polarization controller at the receiver's input stage · CPC title

• G02B6/4204

  the coupling comprising intermediate optical elements, e.g. lenses, holograms (encapsulated active devices H01S5/02208) · CPC title

• H04B10/61

  Coherent receivers · CPC title