EP0442518A3
A method for optical switching and an optical switch
Abstract
A method for optical switching using an optical directional coupler. In a first step, excitation light is supplied to an interaction region of the coupler having input and output ports. The interaction region is doped with an active ion having the capability for optical amplification. In a second step, signal light is inputted to one of the input ports and amplified in the interaction region. In a third step, the signal light is outputted from one of the output ports depending on whether saturation of optical gain takes place or not.
Term
Term ended
Projected expiry passed 15 February 2011, 15.6 years ago.
- Priority
- Filed
- Published
- Projected expiry
- Today
Every citation, both ways
| Document | Relation | Office | Category | Cited during |
|---|---|---|---|---|
| EP0324541A2 | Cites | European Patent Office (EPO) | A | Search report |
| US3408131A | Cites | United States of America | A | Search report |
| JPH0331826A | Cites | Japan | AP | Search report |
6 members in 4 offices
Priority claims3
| Document | Office | Kind | Date |
|---|---|---|---|
| 3587490 | Japan | – | |
| 3587490 | Japan | A | |
| JP19900035874 | – | – | – |
Members6
| Document | Office | Kind | |
|---|---|---|---|
| EP0442518A2 | European Patent Office (EPO) | A2 | |
| AU7114291A | Australia | A | |
| JPH03239231A | Japan | A | |
| US5136670A | United States of America | A | |
| EP0442518A3This record | European Patent Office (EPO) | A3 | |
| AU645774B2 | Australia | B2 |
10 legal events, as the office reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | |
|---|---|---|
| Application deemed to be withdrawnWithdrawn18D | 18D | |
| Information on the status of an ep patent application or granted ep patentGrantedSTATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWNSTAA | STAA | |
| Despatch of communication of intention to grant a patentORIGINAL CODE: EPIDOS IGRAGRAH | GRAH | |
| Despatch of communication of intention to grantORIGINAL CODE: EPIDOS AGRAGRAG | GRAG | |
| First examination report despatched17Q | 17Q | |
| Request for examination filed17P | 17P | |
| Designated contracting statesAK | AK | |
| Search report despatchedORIGINAL CODE: 0009013PUAL | PUAL | |
| Designated contracting statesAK | AK | |
| Public reference made under article 153(3) epc to a published international application that has entered the european phaseORIGINAL CODE: 0009012PUAI | PUAI |
Numbers
- Publication
- 0442518
- Publication, DOCDB
- 0442518
- Publication, EPODOC
- EP0442518
- Application
- 102163
- Application, DOCDB
- 91102163
- Application, EPODOC
- EP19910102163
Titles3
- English
- A method for optical switching and an optical switch
- German
- Verfahren zum optischen Schalten und optische Schaltvorrichtung
- French
- Méthode de commutation optique et élément de commutation optique
Classification
- CPC, 3
- G02F1/3131
- G02F1/293
- H01S3/06754
- IPC, 5
- G02B6 26
- G02F1 29
- G02F1 313
- G02F1 35
- H01S3 067
Designated states5
- Contracting states, 5
- Germany
- France
- United Kingdom
- Italy
- Netherlands (Kingdom of the)