• Coherent Corp. (NYSE:COHR) introduces the industry's first 400 Gb/s Differential Electro-absorption Modulated Laser (D-EML), marking a significant advancement in optical networking technology.
• The new D-EML offers doubled signal amplitude, reduced power consumption, and minimized crosstalk, enhancing Optical Modulation Amplitude (OMA) and Extinction Ratio (ER) performance.
• Despite technological advancements, COHR's stock has seen fluctuations, with a current price of $65.73, reflecting a decrease of 3.20%.

Coherent Corp. (NYSE:COHR) is a prominent player in the photonics industry, known for its innovative solutions in optical networking technology. The company has recently introduced the industry's first 400 Gb/s Differential Electro-absorption Modulated Laser (D-EML) at the OFC 2025 event. This advancement is crucial for data centers, addressing challenges in optical transceiver designs for 1.6T and future 3.2T connectivity, which are vital due to the rapid growth of AI infrastructure.

The new D-EML by Coherent offers significant improvements over traditional single-ended EMLs. Its differential design doubles the signal amplitude, reducing power consumption and minimizing crosstalk. This results in superior Optical Modulation Amplitude (OMA) and Extinction Ratio (ER) performance. An integrated on-chip termination network further enhances electrical performance by reducing the need for extensive signal pre-conditioning, thereby improving signal integrity.

Dr. Beck Mason, Executive Vice President of Telecommunications at Coherent, highlighted the company's commitment to innovation with this pioneering design. Ciena's support in providing a DSP chip for the laser demonstration underscores the collaborative effort in this technological breakthrough. The 400G D-EML will be showcased at OFC 2025, with the 200G D-EML expected to be available in 2026.

Despite these advancements, Coherent's stock performance has seen fluctuations. On March 24, 2025, Raymond James upgraded COHR to "Strong Buy" from "Underperform," with the stock priced at $76.71. However, the current stock price is $65.73, reflecting a decrease of 3.20% or $2.17. The stock has fluctuated between $64.88 and $68.40 today, with a market capitalization of approximately $10.19 billion.

Over the past year, COHR has experienced a high of $113.60 and a low of $48.78. Today's trading volume for COHR is 2,422,693 shares, indicating active investor interest. As Coherent continues to innovate in the photonics industry, its stock performance remains a point of interest for investors and analysts alike.