Power of Attorney for Grant Hoffman

This filing details a Power of Attorney granted by Grant Hoffman, SVP Chief Supply Chain Officer at CIENA CORP, to Sheela Kosaraju, Erik J. Lichter, and Michelle Rankin. The attorneys-in-fact are authorized to prepare and execute all necessary Forms (including 3, 4, and 5) and amendments related to Section 16(a) of the Securities and Exchange Act of 1934. They are empowered to file these forms with the SEC and other relevant authorities, and to take any action deemed beneficial or legally required. The Power of Attorney remains in effect until a signed revocation is delivered to the attorneys-in-fact. The document was executed on June 8, 2026.