Optical module with electromagnetic absorption

Patent metadata

Field	Value
Publication number	US-9989718-B2
Application number	US-201715652426-A
Country	US
Kind code	B2
Filing date	Jul 18, 2017
Priority date	Jul 27, 2016
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

An optical module includes a board; a photoelectric transducer disposed on the board; an optical waveguide that is connected to the board and transmits light entering or emitted from the photoelectric transducer; an optical connector including a first end connected to the optical waveguide and a second end to be connected to an optical cable; a housing that houses the board, the photoelectric transducer, the optical waveguide, and the optical connector; and a conductive part that is provided between the optical waveguide and the housing, in contact with the housing, and formed of an elastic conductive material or a radio absorbing material.

First claim

What is claimed is:

1. An optical module, comprising:
a board;
a photoelectric transducer disposed on the board;
an optical waveguide that is connected to the board and transmits light entering or emitted from the photoelectric transducer;
an optical connector including a first end connected to the optical waveguide and a second end to be connected to an optical cable;
a housing that houses the board, the photoelectric transducer, the optical waveguide, and the optical connector; and
a conductive part that is provided between the optical waveguide and the housing, in contact with the housing, and formed of an elastic conductive material or a radio absorbing material.

2. The optical module as claimed in claim 1 , wherein the conductive part is provided between a first surface of the optical waveguide and the housing and between a second surface of the optical waveguide and the housing.

3. The optical module as claimed in claim 1 , further comprising:
multiple protrusions formed on a surface of the housing that is in contact with the conductive part,
wherein the protrusions are arranged at a pitch of less than or equal to λ/4 where λ indicates a wavelength of an electromagnetic wave emitted out of the housing.

4. An optical module, comprising:
a board;
a photoelectric transducer disposed on the board;
an optical waveguide that is connected to the board and transmits light entering or emitted from the photoelectric transducer;
an optical connector connected to the optical waveguide;
an optical cable connected to the optical connector;
a housing that houses the board, the photoelectric transducer, the optical waveguide, and the optical connector;
a cable boot that is connected to the housing and covers the optical cable; and
a conductive part that is disposed between the cable boot and the optical cable, and formed of a conductive material or a radio absorbing material.

5. The optical module as claimed in claim 4 , wherein the conductive part includes multiple protrusions that protrude toward the optical cable.

6. The optical module as claimed in claim 4 , wherein the conductive part is electrically connected to the housing.

7. An optical module, comprising:
a board;
a photoelectric transducer disposed on the board;
an optical waveguide that is connected to the board and transmits light entering or emitted from the photoelectric transducer;
an optical connector connected to the optical waveguide;
an optical cable connected to the optical connector;
a housing that houses the board, the photoelectric transducer, the optical waveguide, and the optical connector;
a cable boot that is connected to the housing, covers the optical cable, and is formed of a conductive material or a radio absorbing material; and
multiple protrusions formed on an inner surface of the cable boot.

8. The optical module as claimed in claim 7 , wherein the protrusions are arranged at a pitch of less than or equal to λ/4 where λ indicates a wavelength of an electromagnetic wave emitted out of the housing.

9. The optical module as claimed in claim 8 , wherein the protrusions are arranged at various pitches.

Assignees

• Fujitsu Component Ltd
• Fujitsu Ltd

Inventors

• Kurashima Shigemi
• Kanda Mitsuki
• Akieda Shinichiro
• Yagisawa Takatoshi

Classifications

• G02B6/4284

  of optical modules with disconnectable electrical connectors (latching arms for electrical connectors H01R13/627) · CPC title

• G02B6/4292

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

• G02B6/4277 Primary

  Protection against electromagnetic interference [EMI], e.g. shielding means (shielding of electric apparatus H05K9/00, of instruments G12B17/00) · CPC title

• G02B6/3887

  Anchoring optical cables to connector housings, e.g. strain relief features · CPC title

• G02B6/428

  containing printed circuit boards [PCB] · CPC title