Investing.com -- Ciena Corporation (NYSE: CIEN) reported fiscal second-quarter results that exceeded analyst expectations, yet shares fell 5.7% premarket.

The networking equipment maker posted adjusted EPS of $1.64, beating the analyst estimate of $1.46 by $0.18. Revenue reached $1.57 billion, surpassing the consensus estimate of $1.5 billion and marking a 40% increase from $1.13 billion in the same quarter last year. The company attributed the strong results to its portfolio strength and execution in a dynamic supply environment.

For the fiscal third quarter 2026, Ciena issued revenue guidance of $1.575 billion to $1.675 billion. The midpoint of $1.625 billion exceeds the analyst consensus of $1.555 billion. The company also raised its full fiscal year 2026 revenue guidance to a range of $6.2 billion to $6.4 billion, with the midpoint of $6.3 billion above the consensus estimate of $6.183 billion, representing a 32% YoY increase.

"Today's results reflect the strength of our portfolio, the power of our business model, and disciplined execution in a dynamic supply environment," said Gary Smith, president and CEO of Ciena.

Adjusted gross margin for the quarter expanded to 44.9%, up from 41.0% in the prior-year period. Adjusted operating margin reached 19.5%, compared to 8.2% a year earlier. The company's adjusted EPS of $1.64 represented a 290% increase from $0.42 in the fiscal second quarter 2025.

The Optical Networking segment drove growth, generating $1.1 billion in revenue, up from $773.6 million YoY. Routing and Switching revenue nearly doubled to $174.2 million from $92.7 million.

For the fiscal third quarter, Ciena expects adjusted gross margin of approximately 45% and adjusted operating margin between 19% and 20%. The company repurchased approximately 0.2 million shares for $83.1 million during the quarter.