# US 9,039,301 B2 · Optical transceiver having enhanced EMI tolerance

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- Number: US 9,039,301 B2
- Document ID: US9039301B2
- Status: Granted
- Kind: B2
- Application number: 13/747,854
- Filed: 2013-01-23
- Published: 2013-05-30
- Granted: 2015-05-26
- Earliest claimed: 2010-12-20
- Assignees: Sumitomo Electric Industries, Ltd.
- Applicants: Sumitomo Electric Industries, Ltd.
- Inventors: Daisuke Kawase; Kuniyuki Ishii; Hiroyasu Oomori; Hiromi Kurashima
- Web page: https://patentgrep.com/patent/US9039301B2

## CPC

- H04B 10/40: Transceivers
- G02B 6/4227: {Active alignment methods, e.g. procedures and algorithms}
- H05K 9/0058: {specially adapted for optoelectronic applications}
- H04B: TRANSMISSION
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

An optical transceiver that attenuates the EMI radiation leaked therefrom is disclosed. The optical transceiver includes a top cover and the bottom base to form a cavity into which a TOSA, a ROSA, and a circuit are set. At least one of the top cover and the bottom base provides a combed structure in a rear portion of the optical transceiver, where the combed structure has a plurality of T-shaped fins to attenuate the EMI radiation.

## Claims

### Claim 1

An optical transceiver, comprising:
an optical subassembly for converting one of an electrical signal and an optical signal into other of an electrical signal and an optical signal;
an electronic circuit to communicate with the optical subassembly, the electronic circuit generating electromagnetic interference (EMI) radiation; and
a housing made of electrically conductive material, the housing enclosing the optical subassembly and the electronic circuit,
wherein the housing includes a combed structure with a T-shaped fin formed by an overhang and a post to attenuate the EMI radiation.

### Claim 2 (depends on 1)

The optical transceiver of claim 1,
wherein the housing includes a top cover and a bottom base, and
wherein at least one of top cover and the bottom cover includes the combed structure.

### Claim 3 (depends on 1)

The optical transceiver of claim 1,
wherein the combed structure includes at least two T-shaped fins with a gap between neighbor overhangs.

### Claim 4 (depends on 3)

The optical transceiver of claim 3,
wherein the gap filled with a dielectric material.

### Claim 5 (depends on 4)

The optical transceiver of claim 4,
wherein the dielectric material is one of a polyimide, a liquid crystal polymer and an acrylic resin.

### Claim 6 (depends on 3)

The optical transceiver of claim 3,
wherein the T-shaped fin and the gap determines a wavelength of the EMI radiation to be attenuated by a total dimension of a length of the overhang, a thickness of the overhang, a half of the post, and a half of the gap to neighbor overhang.

### Claim 7

An optical communication apparatus, comprising:
a host system providing a metal cage; and
an optical transceiver set in the metal cage, wherein the optical transceiver includes,
an optical subassembly for converting one of an electrical signal and an optical signal into other of an electrical signal and an optical signal,
an electronic circuit to communicate with the optical subassembly, the electronic circuit generating electromagnetic interference (EMI) radiation,
a housing made of electrically conductive material, the housing enclosing the optical subassembly and the electronic circuit, and
a ground finger making in contact with the metal cage,
wherein the housing includes a combed structure with a T-shaped fin including an overhang supported by a post to attenuate the EMI radiation.

### Claim 8 (depends on 7)

The optical communication apparatus of claim 7,
wherein the housing includes a top cover and a bottom base, and
wherein at least one of the top cover and the bottom base provides the combed structure.

### Claim 9 (depends on 7)

The optical communication apparatus of claim 7,
wherein the combed structure includes a plurality of T-shaped fins each forming a gap with respect to the neighbor overhang.

### Claim 10 (depends on 9)

The optical communication apparatus of claim 9,
wherein the gap filled with a dielectric material.

### Claim 11 (depends on 10)

The optical communication apparatus of claim 10,
wherein the dielectric material is one of a polyimide, a liquid crystal polymer and an acrylic resin.

### Claim 12 (depends on 9)

The optical communication apparatus of claim 9,
wherein the T-shaped fin and the gap to the neighbor overhang determines a wavelength of the EMI radiation to be attenuated by a total dimension of a length of the overhang, a thickness of the overhang, a half of the post, and a half of the gap to the neighbor overhang.

### Claim 13 (depends on 7)

The optical communication apparatus of claim 7,
wherein the housing of the optical transceiver forms a gap against the metal cage, and
wherein the ground finger includes a plurality of fingers each forming a gap against neighbor finger to leak the EMI radiation therethrough.