1. Adtran Inc.
2. ADVA Optical Networking SE
3. ALE USA Inc.
4. Broadcom Inc.
5. Ciena Corporation
6. Cisco Systems Inc.
7. Corning Incorporated
8. Ericsson AB
9. Fujitsu Limited
10. Huawei Technologies Co. Ltd.
11. Juniper Networks Inc.
12. NEC Corporation
13. Nokia Corporation
14. TE Connectivity Ltd.
15. ZTE Corporation