Optical Test Engineer — CPO Systems & Fiber/Free‑Space

Flint Hills Resources; Fremont (CA); On-site; USD 130,000 - 160,000; Full time

Job summary

Molex, a Koch company, in Fremont, CA is seeking an experienced Optical Engineer to own test concepts, fixtures, and validation for Co-Packaged Optics (CPO). You will run hands-on measurements and analyze results to support customers and cross-functional teams.

The role requires strong opto-mechanical intuition, fiber and free-space test methods, and clear technical communication; onsite 5 days/week in Fremont with opportunities to implement design-for-test improvements.

Qualifications

• BS or MS in Optical Engineering, Physics, Applied Physics or EE.
• 3+ years hands-on optical testing and characterization (fiber/free-space).
• Experience with fiber/free-space optic device test methods and common metrics (IL, RL, PDL, OSNR).

Responsibilities

• Develop and own test concepts and measurement plans for CPO modules, optical engines, and related subsystems.
• Design, build, and validate optical test setups and fixtures (fiber coupling, alignment stages, free-space benches, fiber interfaces).
• Execute hands-on measurements and characterize devices: insertion loss, return loss, PDL, crosstalk, extinction ratio, OSNR, eye diagrams.
• Automate test sequences and data collection (instrument control scripting).
• Analyze test data, perform statistical analysis, summarize technical findings.
• Troubleshoot test and integration issues; propose corrective actions and design-for-test improvements.
• Prepare technical documentation and present results to leadership and customers.

Skills

Hands-on lab skills

Optical testing experience

Data analysis skills

Cross-functional communication

Attention to detail

Education

BS in Optical Engineering/Physics/Applied Physics/EE

MS in Optical Engineering/Physics/Applied Physics/EE

Tools

OSA

Optical power meters

BERTs

Alignment stages

Fiber handling tools

Job description

Molex, a Koch company, in Fremont, CA is seeking an experienced Optical Engineer to own test concepts, fixtures, and validation for Co-Packaged Optics (CPO). You will run hands-on measurements and analyze results to support customers and cross-functional teams.

The role requires strong opto-mechanical intuition, fiber and free-space test methods, and clear technical communication; onsite 5 days/week in Fremont with opportunities to implement design-for-test improvements.