Senior Fiber Optic Technician — Precision Cabling & Lab

Commonwealth Fusion; Somerville (MA); On-site; USD 108,885,504 - 137,539,584; Full time

Job summary

Commonwealth Fusion Systems seeks a skilled fiber optics technician to handle, splice, test, and route thousands of fibers for the SPARC fusion machine. You’ll perform mechanical integration, add protective wrappings, and train others in proper installation and measurement procedures.

The role emphasizes safety improvements for laser and fiber handling, plus fulfilling manufacturing and R&D fiber needs. Strong lab experience and travel-ready availability are required.

Qualifications

• 4+ years experience in fiber optics field applications.
• Experience with attenuation, insertion loss, and spectral analysis measurements using OTDR/OSA/OBR/Power meter.
• Must have experience fiber handling in a lab setting with known standards.
• Willingness to travel or work nights/weekends/on-call occasionally.

Responsibilities

• Handle routing, splicing, testing of thousands of fibers in the SPARC fusion machine.
• Mechanically integrate small assemblies with fiber work, such as passthrough flanges and enclosures.
• Install composite or polymer wrappings for the fibers and their enclosures.
• Train technicians in proper installation, splicing, routing, and measurement procedures.
• Improve safety protocols for laser and fiber optic handling.
• Fulfill manufacturing and R&D fiber needs.

Skills

Fiber optics

Measurement experience

Lab fiber handling

Safety protocols

Communication

Attention to detail

Training technicians

Splicing techniques

Cryogen/vacuum fiber assemblies

Specialty fiber splicing

Tools

OTDR

OSA

OBR

Power meter

Job description

Commonwealth Fusion Systems seeks a skilled fiber optics technician to handle, splice, test, and route thousands of fibers for the SPARC fusion machine. You’ll perform mechanical integration, add protective wrappings, and train others in proper installation and measurement procedures.

The role emphasizes safety improvements for laser and fiber handling, plus fulfilling manufacturing and R&D fiber needs. Strong lab experience and travel-ready availability are required.