Photonics Engineer- Optical Link Bring-up

Lightmatter is leading the revolution in AI data center infrastructure, enabling the next giant leaps in human progress. The company invented the world's first 3D-stacked photonics engine, Passage, capable of connecting thousands to millions of processors at the speed of light in extreme-scale data centers for the most advanced AI and HPC workloads.

Lightmatter raised $400 million in its Series D round, reaching a valuation of $4.4 billion. We will continue to accelerate the development of data center photonics and grow every department at Lightmatter!

If you're passionate about tackling complex challenges, making an impact, and being an expert in your craft, join our team of brilliant scientists, engineers, and accomplished industry leaders.

Lightmatter is (re)inventing the future of computing with light!

We are seeking a highly skilled High-Speed Photonics Engineer with extensive hands-on experience in lab testing high-speed optical links and photonic transceivers. The ideal candidate will have a strong background in waveguide-based high-speed E / O and O / E components, and will be proficient in debugging, data analysis, and RF simulation tools.

Join a tight-knit team where each individual's contributions directly influence the success of the company and product! You'll have the opportunity to build a new kind of computer from the ground up and to solve groundbreaking challenges along the way. Work with people who love to build and who thrive in technically diverse environments where great ideas are prioritized.

Responsibilities :

• Contribute to the bring-up and characterization of high-speed optical components, including modulators and photodetectors, ensuring they meet performance expectations.
• Design and execute validation and debug plans aligned with product specs, including link-level electro-optic testing using industry-standard equipment like BERTs, DCAs, VNAs, and AWGs.
• Collaborate with multidisciplinary teams to identify and resolve issues across optics, electronics, and packaging, leveraging both lab data and simulation tools such as HFSS, ADS, and Lumerical.
• Analyze high-speed signal behavior using eye diagrams, bathtub curves, and equalization techniques (CTLE, DFE, FFE) to improve link quality and system robustness.
• Configure and optimize DSP-based SerDes to interface with custom optical modules and ensure seamless system integration.
• Automate test procedures and analyze results using Python or MATLAB to streamline validation workflows and support engineering decisions.

Qualifications :

Preferred Qualifications

We offer competitive compensation. The base salary range for this role determined based on location, experience, educational background, and market data.

Salary Range

$165,000-$225,000 USD

Benefits

Benefits eligibility may vary depending on your employment status. Lightmatter recruits, employs, trains, compensates, and promotes regardless of race, religion, color, national origin, sex, disability, age, veteran status, and other protected status as required by applicable law.

Export Control

Candidates should have capacity to comply with the federally mandated requirements of U.S. export control laws.

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