| Subsidiary | Jurisdiction of Incorporation or Organization | ||||
| Ciena Communications, Inc. | Delaware | ||||
| Ciena Canada ULC | Canada | ||||
| Ciena Switzerland GMBH | Switzerland | ||||
| Ciena Global Holding, LP | United Kingdom | ||||
| Ciena Global Products Company, Ltd | United Kingdom | ||||
| Ciena Limited | United Kingdom | ||||