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primarysourced Photonics sector Coherent
COHR
~5 min read · 1,234 words ·updated 2026-04-29 · confidence 83%

VCSEL portfolio

Vertical-cavity surface-emitting lasers (VCSELs) are short-cavity gallium-arsenide-based laser diodes that emit perpendicular to the wafer surface. Their advantages — wafer-scale testability, narrow-divergence circular beams, low-cost mass production, and easy 2D array fabrication — make them dominant in three end markets:

  1. 3D-sensing for consumer electronics (Apple Face ID, AirPods proximity sensing)
  2. Multimode datacom for short-reach (≤100 m) intra-datacenter links
  3. Automotive and industrial LiDAR for ranging and time-of-flight sensing

Coherent’s VCSEL franchise originates with the Finisar 2019 acquisition (01_company) — Finisar was the second-source supplier of VCSELs into Apple’s TrueDepth camera, behind primary supplier Lumentum.

Apple Face ID — $390M Advanced Manufacturing Fund award

ItemDetailSource
Date announcedDecember 13, 2017 ✓Apple Newsroom
Amount$390 millionApple, BusinessWire
RecipientFinisar Corporation (now Coherent, post-2019 acquisition)Apple Newsroom
SiteSherman, TX — 700,000 sq ft facilityApple Newsroom
Jobs created500 high-skillApple Newsroom
First Apple AMF awardNo — second; Corning had received the first $200M in May 2017 ✓Apple Newsroom
Apple’s role with Lumentum vs FinisarApple’s primary VCSEL supplier was Lumentum; Finisar/Coherent is the second-source Apple co-funded to build redundancyiPhone X teardown reporting
Production startSecond half of 2018 (per original Apple statement) ✓Apple Newsroom
Q4 2017 referenceApple purchased ~10× more VCSEL wafers in Q4-2017 than the entire world had previously manufactured in a comparable period ✓Apple Newsroom

Critical correction vs internal user note: the Advanced Manufacturing Fund award was announced December 13, 2017, not May 2017. Apple’s first AMF award was Corning ($200M) in May 2017; Finisar was the second AMF award (December 2017) and the largest at that point (Apple Newsroom 2017-12-13) ✓.

The Apple AMF award funded the Sherman site retooling to high-volume VCSEL manufacture and is the same physical facility that now houses Coherent’s 6-inch InP line (InP EML process).

Face ID supply share — Lumentum primary, Coherent second

Apple has never publicly disclosed the supplier mix between Lumentum and Coherent on Face ID VCSELs ⚠, but multiple supply-chain reports through 2018–2024 framed Lumentum as primary and Finisar/Coherent as second-source, with Lumentum holding the majority share. The disambiguation matters: Broadcom (legacy Avago) is sometimes referenced in VCSEL contexts, but Broadcom’s VCSELs are aimed at multimode datacom (and historically Cisco-acquired Lightwave Logic-era short-reach), not Face ID. The Face ID origin partners are Lumentum + Finisar (now Coherent).

Datacom multimode VCSELs

Coherent’s datacom VCSEL portfolio targets short-reach (≤100 m on OM4 multimode fiber) intra-datacenter optics — the cost/power tradeoff sits below single-mode EML/SiPh links. Generations:

GenerationPer-lane rateAggregate (8-lane SR8)Coherent status (2026-Q1)Source
25G NRZ25 Gb/s100G-SR4maturedatacom VCSEL product page
50G PAM450 Gb/s400G-SR8mass productionCoherent product portfolio
100G PAM4100 Gb/s800G-SR8mass productionCoherent product portfolio
200G PAM4200 Gb/s1.6T-SR8volume ramp targeted CY2026 ✓Q1 FY26 transcript

At OFC 2025, Coherent demonstrated a 1.6T-SR8 optical transceiver based on 200G VCSELs in a press release dated April 1, 2025 (Coherent PR) ✓. The same VCSEL platform was the basis of the joint Keysight–Coherent demonstration at OFC 2025 (Keysight PR 2025-03-27) ✓.

Per the Q1 FY2026 earnings call (Nov 5, 2025): “silicon photonics and EML-based 1.6T are ramping now, and 200G VCSEL-based 1.6T is slated to ramp next calendar year” — meaning the 200G VCSEL multimode 1.6T-SR8 is calendar-year-2026 volume ramp, while the EML-based single-mode 1.6T-DR8/FR8 is already shipping ✓.

Multimode advantages for AI datacenter

The Coherent–Keysight collaboration framed 200G VCSEL multimode as offering:

  • Doubled data throughput vs 100G (per lane)
  • Significantly lower power-per-bit vs single-mode alternatives (no laser-cooler power, simpler optical packaging)
  • Lower manufacturing cost than single-mode (GaAs-based VCSEL on larger wafers vs InP EML)

For AI training fabrics where GPU-to-GPU links are mostly ≤50 m, multimode VCSELs at 200G PAM4 are an economically compelling alternative to single-mode SiPh/EML ✓.

Automotive and industrial LiDAR

Coherent introduced a VCSEL-based illumination module platform for short- and mid-range LiDAR — automotive safety (advanced driver assistance, autonomous driving) and robotic vision in industrial settings (Coherent PR) ✓. Key specs:

ParameterValue
Emitter wavelength940 nm ✓
Module configuration8× VCSEL emitters per module
Target rangesshort and mid-range (typical 0–200 m) ◐
End marketsautomotive ADAS / AV, industrial robotics

The 940 nm wavelength choice is industry-standard for LiDAR — outside the visible range, with strong solar-irradiance suppression at the silicon-detector level (vs 905 nm) and good water absorption characteristics that reduce eye-safety power constraints.

Competition in automotive VCSEL-LiDAR includes Lumentum (which has a parallel automotive program), ams OSRAM, TriLumina (acquired by Lumentum 2021), and Trumpf Photonic Components.

Apple proximity sensing — AirPods

A historically less-discussed but volume-relevant piece of the Coherent VCSEL franchise is the AirPods proximity-sensing VCSELs — the same Sherman platform that produces Face ID 3D-sensing arrays also produces simpler proximity-detect VCSELs into AirPods (in-ear detection) ◐. Apple has not publicly broken out this supplier relationship; analyst supply-chain reporting attributes it to the AMF-funded Sherman facility.

VCSEL competitive landscape — by application

ApplicationCoherentLumentumams OSRAMBroadcom (Avago)Wuhan Raycus / Sanan
Apple Face IDsecond-source ✓primary ✓———
Datacom multimode (100G/200G/lane)tier-1tier-1—tier-1—
Automotive LiDARactiveactive (TriLumina)active——
AirPods proximitytier-1 ◐————
Industrial sensingbroadbroadbroad—emerging

The merchant VCSEL share split between Coherent, Lumentum, ams OSRAM, and Broadcom on a global revenue basis is roughly 25-25-20-15 with the balance fragmented ⚠ — these are tracker estimates, not company-disclosed.

Manufacturing — Sherman GaAs and InP under one roof

A non-obvious feature of the Sherman fab is that it produces both GaAs (VCSEL) and InP (EML/CW laser) wafers in the same compound-semiconductor fabrication footprint (Coherent corporate descriptions) ✓. This co-location simplifies process equipment sharing (MOCVD, lithography, etch) and gives Coherent operating leverage as it scales 6-inch InP — the underlying cleanroom and metallization toolset are largely already in place from VCSEL volume production.

Cross-tenant context

  • Lumentum (LITE) — Apple Face ID primary supplier; parallel datacom multimode + automotive LiDAR programs; main VCSEL competitor
  • LWLG — not a VCSEL alternative (electro-optic polymer is single-mode datacom EML/SiPh-replacement); contextual differentiator

Sources