Coherent

Principal Silicon Photonics Test Engineer

Coherent$130K — $155K *
Telecommunications & Hardware
5 - 7 years of experience
Job Overview by Ladders

Qualifications

  • Bachelor's degree or higher in Electrical Engineering, Optical Engineering, Physics, or a related field.
  • Minimum of 5 years of hands-on laboratory experience in photonics, semiconductor, or optoelectronic device testing.
  • Experience with high-precision probe stations and electrical/RF probing of semiconductor devices.
  • Strong understanding of silicon photonic devices and optical coupling techniques.
  • Proficiency in developing automated systems using Python or similar programming languages.

Responsibilities

  • Lead development of silicon photonics test strategies from characterization to manufacturing readiness.
  • Architect automated test platforms for silicon photonic devices and integrated circuits.
  • Develop methodologies for characterizing modulators, photodetectors, and optical components.
  • Implement RF characterization techniques including S-parameter and bandwidth measurements.
  • Enhance test automation and data analysis software to improve efficiency and accuracy.
  • Analyze datasets to identify performance distributions and improve device testing efficiency.
  • Mentor junior engineers in silicon photonics and test engineering fundamentals.

Benefits

  • Hybrid working model with flexibility in work hours.
  • Opportunities for professional development and mentoring.
  • Occasional off-site meetings or travel.
  • Regular interaction with a team-oriented environment.
  • Employee participation in safety and environmental quality training.
Full Job Description
Job Description

Primary Duties & Responsibilities
  • Lead the development of die-level silicon photonics test and characterization strategies, from early device characterization through product qualification and manufacturing readiness.
  • Architect and develop automated electro-optical and RF test platforms for silicon photonic devices and photonic integrated circuits (PICs).
  • Develop characterization methodologies for devices such as modulators, photodetectors, waveguides, couplers, resonators, and other passive and active photonic components.
  • Develop RF and high-speed characterization techniques, including S-parameter measurements, frequency response, electro-optical bandwidth, impedance characterization, and high-speed signal integrity measurements.
  • Develop test automation, data acquisition, and analysis software using Python and/or other appropriate programming environments.
  • Improve test throughput, repeatability, automation, and cost while maintaining measurement accuracy and coverage.
  • Analyze characterization datasets to identify performance distributions, process sensitivities, correlations, failure mechanisms, and opportunities for improved device performance and test efficiency.
  • Define test structures and characterization requirements in collaboration with the silicon photonics and design team.
  • Partner with process integration, wafer fabrication, packaging, reliability, product engineering, and manufacturing teams to correlate die-level measurements with downstream package and system performance.
  • Drive design-for-test (DFT) improvements and influence future device and PIC designs based on characterization results and test limitations.
  • Lead root-cause investigations for complex electrical, RF, optical, and electro-optical performance issues.
  • Serve as a technical mentor and coach for junior and mid-career engineers, helping them develop strong fundamentals in silicon photonics, RF measurement, electro-optical characterization, and test engineering.
  • Review test plans, measurement methodologies, automation code, data analysis, and technical conclusions produced by other engineers, providing constructive technical feedback and guidance.
  • Delegate technically challenging projects in a way that develops engineering capability while maintaining appropriate technical oversight.

Education & Experience
  • Bachelor's degree or higher in Electrical Engineering, Optical Engineering, Physics, or a related field.
  • Minimum of 5 years of hands-on laboratory experience in photonics, semiconductor, or optoelectronic device testing.
  • Experience with high-precision probe stations and electrical/RF probing of semiconductor devices.
  • Experience with optical alignment with lenses or fibers to semiconductor devices.
  • Strong understanding of silicon photonic devices, including modulators, photodetectors, passive optical structures, and optical coupling techniques.
  • Experience developing automated laboratory or production test systems using Python or comparable programming languages.
  • Strong hands-on experience with RF/microwave measurement techniques, including vector network analyzers, S-parameters, RF probing, calibration, and de-embedding.
  • Experience with data plotting and analysis software such as JMP, MATLAB, or python.

Skills
  • Strong expertise in RF and microwave test and measurement, including VNAs, S-parameters, RF probing, calibration, de-embedding, transmission lines, and signal integrity.
  • Strong working knowledge of optical test equipment, including tunable lasers, optical power meters, optical spectrum analyzers, polarization controllers, optical switches, and fiber alignment systems.
  • Proficiency in Python or similar programming languages for test automation, instrument control, data acquisition, analysis, and visualization.
  • Strong troubleshooting and root-cause-analysis skills across optical, electrical, RF, mechanical, software, and semiconductor-device domains.
  • Demonstrated ability to transfer specialized knowledge and develop documentation, procedures, training materials, and reference methodologies that enable others to work independently.
  • Ability to guide engineers through experimental design, measurement setup, debugging, data interpretation, and root-cause analysis rather than simply providing solutions.
  • Ability to teach complex RF, photonics, and measurement concepts through both technical explanation and hands-on laboratory coaching.

Working Conditions
  • This position is hybrid.
  • May require occasional off-site meetings or travel.
  • Regular use of a computer and other office equipment is necessary.
  • Interaction with team members and external contacts is a regular part of the job.
  • May require occasional overtime and flexibility in work hours to accommodate the executive's needs.

Physical Requirements
  • Sitting for extended periods while working on a computer or conducting meetings.
  • Use of hands and fingers for typing, writing, and handling documents.
  • Occasional lifting of objects or materials up to 20 pounds for administrative tasks.
  • Ability to communicate verbally and in writing.
  • Mobility within the office environment to attend meetings or interact with colleagues.

Safety Requirements

All employees are required to attend scheduled training, follow the site EHS procedures and Corporate EHS standards. This includes the use of proper protective equipment (PPE) as required by the job responsibilities.

Managers will ensure that all safety and environmental procedures are followed consistently. They will ensure that risk assessments are performed, proper training, work instructions, required PPE is available, and will monitor compliance.

Quality and Environmental Responsibilities

Depending on location, this position may be responsible for the execution and maintenance of the ISO 9000, 9001, 14001 and/or other applicable standards that may apply to the relevant roles and responsibilities within the Quality Management System and Environmental Management System.

About Coherent

Coherent, Inc. is a global leader in providing laser-based solutions to a broad range of commercial and scientific research customers. The company designs, manufactures, and markets lasers, laser-based systems, precision optics, and related accessories for a diverse group of customers. Coherent's markets include scientific research, OEM components and instrumentation, microelectronics, materials processing, and life sciences. The company's products are used in a wide range of applications. Coherent was founded in 1966 and is headquartered in Santa Clara, California.
Learn more about Coherent
Size
5,085 employees
Market Cap
$4.6 billion
Industry
Net Income
-$419.7 million
Founded
1966
5 Year Trend
+27.8%
Revenue
$1.2 billion
NASDAQ

Similar Jobs

More Jobs at Coherent

More Telecommunications & Hardware Jobs

Find similar Principal Silicon Photonics Test Engineer jobs: