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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsSilicon photonics can guide and modulate light on a chip, but practical systems still need a source of light—and silicon is not generally an efficient laser material. In a Moore’s Lobby episode published April 18, 2023, Dr. Tom Mader discussed how OpenLight proposed combining silicon photonics with indium phosphide (InP) lasers and amplifiers, and making that capability available through a foundry-oriented platform. The conversation also follows Mader’s path through Apple, Intel, Amazon, startups, and OpenLight.
What the episode covers
“From Apple to OpenLight: Silicon Photonics and Integrated Lasers with Dr. Tom Mader” is Episode 62 of All About Circuits’ Moore’s Lobby. The publisher lists a runtime of 41:03 and identifies Mader as OpenLight’s chief operating officer at the time. The episode ranges from his career history to silicon-photonics fundamentals, optical modulation, and OpenLight’s proposed platform. Read the episode page at All About Circuits or find its Libsyn directory listing.
The technology and company details below describe what Mader and the publisher presented in 2023. That interview alone does not establish OpenLight’s current leadership, product availability, PDK revision, foundry access, customer adoption, production status, or performance specifications.
Tom Mader’s route from Apple to photonics
The episode’s career story connects early optical-interface ideas with later work in semiconductor and consumer technology. All About Circuits’ biography says Mader developed a patent during an Apple internship, worked on optical communications connected to the concept that became Light Peak, spent six years at Intel and six at Amazon, and later held startup leadership roles before joining OpenLight. The page also lists degrees from UC Berkeley and the University of Colorado Boulder. These are details reported in the publisher’s 2023 biography, not a current employment record.
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Light Peak and the Thunderbolt connection
Mader’s account makes the early optical ambition behind Light Peak a useful bridge to the silicon-photonics discussion. It should not be read as meaning that every commercial Thunderbolt implementation used optical communication. Light Peak’s early concept involved optics; later Thunderbolt products and implementations included electrical and optical variants. The episode is a source for Mader’s account of that history, not a complete technical history of the interface.
Silicon photonics, in practical terms
Silicon photonics uses semiconductor fabrication techniques to build circuits that route and manipulate optical signals on or near an integrated circuit. A typical optical link has to generate light, guide it, encode information onto it, send it through a fiber or other optical path, and convert it back into an electrical signal.
- Waveguides, couplers, and splitters route or divide light across the photonic circuit.
- A laser supplies the optical carrier; an amplifier can increase optical power.
- A modulator encodes information onto the light.
- A photodetector converts received light into an electrical signal.
- Drivers and receivers connect the photonic functions to the electrical system.
- Packaging and fiber attachment connect the chip to the rest of the system and remain important even when optical functions are integrated.
“Silicon photonics” does not mean every function is made from silicon. Silicon is well suited to guiding and manipulating light, including waveguiding and modulation. Efficient optical gain—the function that lets a laser generate light or an amplifier strengthen it—is commonly provided by direct-bandgap materials such as InP. The episode describes OpenLight’s approach as combining InP laser and amplifier functions with silicon photonics.
Why put the laser on the photonic platform?
A system needs a stable optical source regardless of where that source sits. With a separately packaged laser, the source and photonic chip can be selected and tested independently. But light must then cross an interface into the chip, and system designers must account for coupling, alignment, assembly, and package space.
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| Architecture | Potential strengths | Trade-offs to evaluate |
|---|---|---|
| External, separately packaged laser | Independent source selection, testing, and replacement; potentially simpler photonic-chip fabrication; mature component choices. | Coupling loss, alignment and assembly steps, package footprint, and interfaces between source, photonic chip, and electronics. |
| Integrated or co-packaged laser | Shorter optical path to the circuit, potential density gains, and fewer separate assembly interfaces. | Thermal interaction, heterogeneous-process yield and reliability, repair and test difficulty, and constraints imposed by the platform and package. |
The word “integrated” can describe different physical arrangements, from bonded materials on a chip to components combined at package or module level. A useful evaluation begins by asking where the laser is physically integrated, not by assuming that the term identifies one standard architecture.
How molecular bonding brings InP and silicon together
In the architecture described in the episode, the silicon photonic circuit supplies the light-routing and modulation functions, while an InP region supplies laser gain or amplification. Molecular bonding joins the dissimilar materials so light from the active InP region can couple into the silicon photonic circuit. This is materially different from placing a separate laser package beside a photonic chip, although the details of the bonding process and integration level are not specified by the episode page.
Heterogeneous integration has a manufacturing challenge as well as a design opportunity. Bond quality, interface defects, process yield, thermal behavior, reliability, and test access all matter. Bonding the active material to the photonic circuit does not remove the need for fiber coupling, electronics, package design, or qualification.
What an open-foundry platform and PDK are meant to change
A photonic process design kit, or PDK, is the design interface between a platform and the engineers using it. Depending on the foundry flow, it can include validated building blocks, layout cells, device models, design rules, simulation data, optical and electrical interfaces, and manufacturing handoff guidance. Packaging and test assumptions can also shape whether a design is practical.
The episode presents OpenLight’s PDK as a way for customers to design with integrated InP lasers and amplifiers on a silicon-photonics platform manufactured through Tower Semiconductor. That is the relationship described in 2023, not confirmation of its status today. The interview page does not specify current PDK versions, process rules, design-tool support, pricing, lead times, or production volumes.
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- Define the system need: Establish wavelength, optical power, modulation format, data rate, temperature range, packaging, and reliability requirements.
- Check platform fit: Confirm that available PDK devices and models cover the needed functions and that the design flow supports the team’s tools.
- Model and lay out the circuit: Use the supplied device models and design rules, then account for optical loss, thermal effects, and electrical interfaces.
- Coordinate manufacturing and test: Confirm the foundry route, wafer test capabilities, packaging plan, qualification needs, design ownership, and schedule before tape-out.
A PDK can reduce the amount of process-specific work a design team must start from scratch. It cannot replace optical modeling, thermal design, packaging engineering, reliability qualification, or manufacturing coordination.
Why the “Arm-like” analogy needs limits
Mader framed OpenLight’s proposed ecosystem as “Arm-like”: a platform provider supplies reusable technology and design enablement, a foundry manufactures customer designs, and customers create differentiated products. The analogy is about ecosystem enablement. It does not establish that OpenLight has Arm’s scale, licensing structure, or market position.
Amplitude and phase modulation are different design choices
Modulation is how a transmitter encodes information onto light. The episode highlights both amplitude modulation (AM) and phase modulation (PM). In AM, information changes the optical intensity. In PM, it changes the phase of the optical carrier. Silicon-photonic modulators can implement these functions, but the chosen format shapes the rest of the link.
Modulation choice affects bandwidth, optical loss, linearity, receiver architecture, noise tolerance, and signal processing. Phase modulation is not automatically better: its value depends on the link, detection scheme, available optical power, and system complexity. Integrating a laser and implementing a modulator are separate achievements; success at one does not establish performance at the other.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Applications the episode points toward
The publisher associates the platform with datacom, LiDAR, high-performance computing (HPC), AI infrastructure, optical computing, and broader specialized uses. These are target or potential application areas in the episode’s framing, not evidence of commercial deployment in each market.
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Datacom and AI/HPC interconnects
Datacom links and AI/HPC systems can need high aggregate bandwidth and dense optical connections, especially as systems move data between processors, accelerators, memory, and network equipment. Relevant measures include energy per bit, optical power after coupling and modulation, thermal behavior, reliability, density, latency, and manufacturability. An integrated source is useful only if the complete link meets those system requirements.
LiDAR and sensing
LiDAR and specialized sensing applications may depend on wavelength, coherence, tunability, phase control, stability, calibration, and environmental robustness. Eye-safety limits and packaging can also constrain a design. A platform’s ability to integrate a laser is not, by itself, proof that it satisfies a particular sensor’s optical or safety requirements.
Optical computing
Optical-computing concepts require controlled sources, modulators, detectors, and scalable electronic control. Integrated photonics may be relevant to those architectures, but the episode’s application list does not establish a product, performance result, or deployment in optical computing.
What an engineering team should verify
The episode page does not supply a datasheet or measured performance figures. Before selecting an integrated-laser platform, request application-specific evidence for the following:
- Laser wavelength range, output power per channel, threshold current, and wall-plug efficiency.
- Relative intensity noise, linewidth, frequency stability, and operating-temperature range.
- Modulation bandwidth, extinction ratio, and optical insertion and coupling losses.
- Thermal tuning needs, crosstalk behavior, and optical power remaining at the receiver.
- Lifetime, failure-rate data, process yield, wafer-level testing, and reliability qualification.
- Available packaging options, fiber attachment, test access, and thermal-control requirements.
- PDK revision, model validation, design rules, supported EDA flows, and process constraints.
- Foundry capacity, lead times, multi-project wafer access, minimum commitments, and non-recurring engineering costs.
- IP ownership and whether the design can be ported to another process or foundry.
Common failure points include optical losses that erase the benefit of a shorter path, laser drift as temperature changes, insufficient power after modulation and coupling, channel crosstalk, bonding defects, model-to-silicon mismatch, and packaging or test delays after wafer fabrication. These risks are reasons to ask for measured, process-relevant data rather than infer system performance from the word “integrated.”
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What the 2023 conversation establishes—and what it does not
The episode is a useful introduction to Mader’s career narrative and to OpenLight’s stated technical and business thesis at the time: combine InP gain with silicon photonics, then make the capability usable through a PDK and foundry relationship. It offers a view of why integrated lasers matter, but it is an interview and synopsis rather than a technical qualification report.
Its publication date is April 18, 2023. The episode does not provide independently verified laser specifications, comparative system results, production yield, customer adoption, current PDK details, commercial pricing, or confirmation that the described Tower Semiconductor relationship and company roles remain unchanged. Readers considering a project should confirm those particulars directly with the relevant organizations.
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