Senior Photonics Circuit Design Engineer

Lightmatter; Mountain View (CA); Híbrido; USD 150.000 - 200.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Health care plan

Retirement matching

Life insurance

Generous time off

Paid family leave

Disability coverage

Training & development

Commuter benefits

Flexible, hybrid workplace model

Equity grants

Descripción de la vacante

Lightmatter is pioneering AI data center photonics. We design and model photonic and analog sub-circuits for Guide laser modules and Passage optical links, bridging device physics with circuit behavior.

You will build high-fidelity models, account for process variations, and enable end-to-end simulations used by architects to optimize performance. You will work with experts across fabrication, design, and testing, applying advanced photonics tools, Python scripting, and data-driven methods to

Formación

• Ph.D. or MS with substantial photonics/IC experience.
• Strong background in silicon photonics and analog circuit modeling.
• Experience with photonic modeling platforms and IC design suites.
• Excellent written and verbal communication skills.

Responsabilidades

• Create high-fidelity compact and behavioral models for active and passive photonic elements.
• Incorporate process variations, dispersion, and thermal effects into models.
• Collaborate with device engineers to calibrate parameters using optical solvers and data across tapeouts.
• Develop sub-circuit simulations for Guide laser modules and Passage interconnects.
• Lead topologies refinement to meet performance, bandwidth, and noise targets.
• Perform corner and Monte Carlo analyses to assess tolerances and yields.
• Validate models against empirical silicon measurements across production cycles.

Conocimientos

Silicon photonics physics

Analog circuit fundamentals

Python for modeling

Data-driven decision making

Modeling automation

Clear written/verbal communication

Educación

Ph.D. in Electrical Engineering / Photonics or related, plus 2+ years (or MS with 5+ years)

Herramientas

Lumerical

RSoft

Tidy3D

Cadence Virtuoso/Spectre

Descripción del empleo

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!

The Laser System Architecture & Engineering (LSAE) team is seeking a Photonics Circuit Design Engineer. The candidate will design and model the photonic and analog sub-circuits that make up Lightmatter's Guide™ laser products and Passage™ optical links. Examples include the laser source and wavelength-locking blocks, ring filter and modulator banks, mux/demux, optical power splitting and monitoring, and the photodetector-receiver front end.

You will own the bridge between device physics and sub-circuit behavior. You will build high-fidelity behavioral models that capture fabrication variability, dispersion and thermal effects. From them you will assemble sub-circuit models that accurately predict how each block performs. Systems architects will build their end-to-end product simulations on your models, so your models must be accurate, correlated to silicon, and ready to plug into larger simulations.

Responsibilities

• Construct and maintain high-fidelity compact and behavioral representations for both active and passive silicon photonic elements, covering waveguides, couplers, MZIs, micro-rings, multiplexers, phase control elements, thermal tuners, modulators, detectors, and integrated III-V/SOA components.
• Incorporate process variations (waveguide geometry and etch biases), dispersion metrics, thermal-optical tuning characteristics, and non-linear properties directly into component modeling.
• Partner with device engineers to extract and calibrate parameter sets using optical solvers (FDTD, EME), foundry process design kits, and physical silicon data across various tapeouts to ensure high model correlation.
• Architect and deliver comprehensive sub-circuit simulations for Guide laser modules, encompassing optical sources, gain media, wavelength control loops, power distribution trees, monitors, and associated analog interfaces (TIAs, converters).
• Implement integrated sub-circuit models for Passage interconnect blocks, including modulated ring arrays, filter banks, thermal controls, drive circuits, DWDM MUX/DEMUX structures, and receiver front-ends.
• Refine sub-circuit topologies against core key performance indicators such as insertion loss, extinction ratio, signal isolation, tuning efficiency, operating bandwidth, and noise performance in collaboration with circuit and device teams.
• Execute corner, statistical Monte Carlo, and margin analyses to establish component tolerances, evaluate yield metrics, and inform experimental test vehicle vehicles and architecture reviews.
• Validate and iterate sub-circuit behavioral representations based on empirical silicon measurements across production cycles.

Required Qualifications

• Ph.D. in Electrical Engineering, Applied Physics, Photonics, or related discipline plus 2+ years of industry experience (or M.S. with 5+ years). Staff level targeting Ph.D. with 6+ years or M.S. with 10+ years.
• Deep background in silicon photonic physics and analog circuit fundamentals, with proven capability in generating behavioral component models for circuit-level co-simulation.
• Practical expertise using photonic modeling platforms (Lumerical, RSoft, Tidy3D) and analog IC suites (Cadence Virtuoso/Spectre).
• Strong Python software skills for modeling, data extraction, and maintainability of shared engineering codebases.
• Analytical mindset capable of addressing complex, unstructured technical issues through data-driven decisions.
• Methodical approach to engineering, with an emphasis on structured review processes and simulation automation.
• Clear written and verbal technical presentation capabilities.

Preferred Qualifications

• Experience with microring modulators and filters, DWDM MUX/DEMUX, and thermal tuning.
• Laser and III-V photonics: DFB, external-cavity or comb sources, SOAs, wavelength lockers, and heterogeneous integration.
• Analog front-end experience with TIAs, modulator drivers, and heater drivers or DACs as they interface to photonic devices.
• Experience with foundry silicon photonics PDKs and process variation data (for example GlobalFoundries, TSMC, Tower, AIM or imec).
• Lab experience correlating models to measurement: OSA, tunable lasers, OVA/LCA, VNA, and wafer-level testing.
• Publications or patents in photonic circuit design or modeling.

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

Salary Range: total compensation goes beyond base salary, it also includes a new hire equity grant, annual performance-based equity, and other rewards that recognize your impact and contribution.: $150,000 USD - $200,000 USD

Benefits

• Comprehensive Health Care Plan (Medical, Dental & Vision)
• Retirement Savings Matching Program
• Life Insurance (Basic, Voluntary & AD&D)
• Generous Time Off (Vacation, Sick & Public Holidays)
• Paid Family Leave
• Short Term & Long Term Disability
• Training & Development
• Commuter Benefits
• Flexible, hybrid workplace model
• Equity grants (applicable to full-time employees)

Benefits eligibility may vary depending on your employment status and location. 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.