Pluggable optical transceiver with highly shielded structure

• US 20050281514A1
• Filed: 04/27/2005
• Published: 12/22/2005
• Est. Priority Date: 04/29/2004
• Status: Active Grant

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: Murata, Hiroshi, Oki, Kazushige, Kurashima, Hiromi, Funada, Tomoyuki, Nito, Kou, Kiyotake, Shojiro
• Granted Patent: US 7,195,403 B2
• Time in Patent Office: Days
• US Class Current: 385/92
• CPC Class Codes: G02B 6/4201 Packages, e.g. shape, construction, internal or external details
• CPC Class Codes: G02B 6/4246 Bidirectionally operating package structures
• CPC Class Codes: G02B 6/4256 Details of housings
• CPC Class Codes: G02B 6/4261 Packages with mounting structures to be pluggable or detachable, e.g. having latches or rails
• CPC Class Codes: G02B 6/4277 Protection against electromagnetic interference [EMI], e.g. shielding means shielding of electric apparatus H05K9/00, of instruments G12B17/00
• CPC Class Codes: G02B 6/4284 of optical modules with disconnectable electrical connectors latching arms for electrical connectors H01R13/627
• CPC Class Codes: G02B 6/4292 the light guide being disconnectable from the opto-electronic element, e.g. mutually self aligning arrangements
• CPC Class Codes: H01R 12/721 cooperating directly with the edge of the rigid printed circuits
• CPC Class Codes: H01R 13/6275 Latching arms not integral with the housing H01R13/6276, H01R13/6277, H01R13/6278 take precedence
• CPC Class Codes: H01R 13/6584 formed by conductive elastomeric members, e.g. flat gaskets or O-rings
• CPC Class Codes: H01R 13/6585 Shielding material individually surrounding or interposed between mutually spaced contacts
• CPC Class Codes: H01R 13/6594 the shield being mounted on a PCB and connected to conductive members
• CPC Class Codes: H05K 9/0058 specially adapted for optoelectronic applications

Abstract

The present invention is to provide an intelligent pluggable transceiver improving an EMI tolerance with a simple mechanism. The optical transceiver of the invention comprises upper and lower housings (11, 12), a holder (81), optical assemblies (51, 61), a cover (14), a substrate (15) and a grip (13). The optical assemblies are fixed with the upper and lower housings together with the holder with interposing the conductive elastic member. Although the rear end of the substrate exposes outside the transceiver, the shield gasket and the ground pattern on the substrate shields the contact portion between the substrate and the upper housing and between the substrate and the cover. Moreover, the grip and the latch lever installed in the lower housing, and the elastic piece realize the latching/releasing mechanism of the transceiver with the host system.

Claims

1. An optical transceiver having strengthened tolerance to electro-magnetic-induced noise, comprising:

a metal upper housing;

a metal lower housing forming an optical receptacle co-operating with said metal upper housing;

a metal cover for forming a cavity cooperating with said upper and lower housings;

an optical assembly having at least metal sleeve protruding in said optical receptacle;

a circuit board for installing an electronic circuit that electrically communicates with said optical assembly; and

a resin holder plated with metal, said resin holder fixing said optical assembly against said upper housing and said lower housing,

wherein said upper and lower housings, said cover and said holder electrically shield said cavity to prevent noise generated by said electronic circuit from radiating outside of said transceiver and to prevent noise from invading into said transceiver.

2. The optical transceiver according to claim 1,

wherein said resin holder is plated with nickel and copper.

3. The optical transceiver according to claim 2,

wherein said resin holder includes a supporting portion, a pair of latch arm extending from said supporting portion, and a conductive elastic member provided in said supporting portion to abut on said lower housing.

4. The optical transceiver according to claim 3,

wherein said conductive elastic member is formed in an edge of said supporting portion facing said lower housing.

5. The optical transceiver according to claim 3,

wherein said lower housing includes a post to be abutted by said supporting portion, said conductive elastic member being provided between said supporting portion and said post.

6. The optical transceiver according to claim 3,

wherein said metal sleeve has a flange to abut on said resin holder, said conductive elastic member being formed in said holder at a portion to abut on said flange of said metal sleeve.

7. The optical transceiver according to claim 2,

wherein said substrate includes a first and second portions provided within said cavity and a third portion outside of said cavity, said optical assembly being electrically connected to said first portion, and said substrate further provides a conductor between said second and third portions.

8. The optical transceiver according to claim 7,

wherein said upper housing includes a shield gasket at a rear end thereof, said shield gasket being in contact with said conductor provided on said substrate.

9. The optical transceiver according to claim 7,

wherein said cover includes a plurality of conductive tabs at a rear end thereof, said plurality of conductive tabs being in contact with said conductor provided in said substrate.

10. The optical transceiver according to claim 7,

wherein said cover includes a shield gasket at a rear end thereof said shield gasket being in contact with said conductor provided in said substrate.

11. The optical transceiver according to claim 2,

wherein said substrate includes a first and second portions provided within said cavity and a third portion outside of said cavity, said optical assembly being electrically connected to said first portion, and

said substrate further provides a first conductor between said second and third portions in a first surface of said substrate and a second conductor between said second and third portions in a second surface of said substrate, said upper housing including a shield gasket to be in contact with said first conductor and said cover being in contact with said second conductor.

12. The optical transceiver according to claim 11,

wherein said first conductor and said second conductor is electrically connected by a via-hole provided within said substrate.

13. The optical transceiver according to claim 11,

wherein said cover further includes a shield gasket to be in contact with said second conductor.

14. The optical transceiver according to claim 2,

wherein said optical assembly includes a transmitting optical assembly and said electronic circuit includes a driver circuit for driving said transmitting optical assembly, and

wherein said transceiver further includes a microwave absorber to cover said driver circuit.

15. The optical transceiver according to claim 14,

wherein said microwave absorber is in contact with said upper housing.