Test Development Engineer - Semiconductor Laser Testing

About the role

Cisco is looking for a Test Development Engineer in Bangkok to design, develop and implement automated test solutions for the characterization and reliability screening of semiconductor laser dies, such as Distributed Feedback (DFB) lasers. The role focuses on Light-Current-Voltage (LIV) characterization and Burn-In (BI) testing at wafer level, working closely with Optical Design, Reliability and Manufacturing teams to deliver high-yield, high-reliability laser components for optical transceivers and silicon photonics products.

Key responsibilities

• Design, develop and validate automated test systems (hardware and software) for laser die LIV characterization and Burn-In testing at wafer level.
• Develop robust test software in Python, LabVIEW or C# to control optical and electrical instrumentation (SMUs, optical power meters, spectrometers, thermal controllers).
• Design and optimize test fixtures, probe cards and optical coupling interfaces for high-throughput, repeatable wafer-level testing.

Required profile

• BS in Computer Science, Electrical Engineering, Computer Engineering or another relevant major.
• 3+ years of hands-on experience in optoelectronic device testing, specifically with semiconductor lasers (DFB, EML, VCSEL or Silicon Photonics).
• Proven experience with LIV characterization and Burn-In (BI) system architectures.
• Excellent verbal and written communication skills.

Required skills

• Hands-on experience with SMUs, optical spectrum analyzers, integrating spheres, photodetectors and temperature controllers (TECs).
• Strong understanding of semiconductor laser physics, optical waveguides and reliability physics (degradation mechanisms, Arrhenius acceleration models).
• Proficiency in automated test software development, specifically Python or LabVIEW.
• Experience with wafer probers (semi-automatic or fully automatic) and optical alignment algorithms.
• Preferred: SQL, data visualization tools, familiarity with high-volume manufacturing environments and test time optimization, and knowledge of silicon photonics testing and grating coupler alignment.