Optical Module Deep Dive: How Coherent, Lumentum, Innolight, Eoptolink, and Source Photonics Run the $40B 800G / 1.6T Optical Module Cycle - and Why 3.2T CPO Is the 2027-2028 Binding Test

Optical module is a $40B/year global market in 2025, and the 2025-2028 cycle has been structurally reshaped by the 800G / 1.6T / 3.2T AI data center cycle. The 5 leading-edge optical module suppliers are: Innolight (China, ~25% global share, the cleanest single optical module pure-play), Coherent (US, ~18% share, the cleanest single integrated laser + optical module supplier), Lumentum (US, ~12% share, the cleanest single EML + tunable laser + 3D sensing supplier), Eoptolink (China, ~10% share, the cleanest single China optical module 2nd-tier), and Source Photonics (US/China, ~7% share, the cleanest single SiPh optical module supplier). The 5 suppliers are ~72% of global optical module supply, with the remaining 28% split across Accelink, Innolight spin-offs, Hisense Broadband, Epson, Mitsubishi Electric, and other regional suppliers.

The 2025-2026 optical module market is structurally driven by 4 binding demand engines. (1) AI data center 800G / 1.6T: the Nvidia GB200 / GB300 / Rubin AI server cycle + the Broadcom Tomahawk Ultra + Cisco Silicon One + Marvell Teralynx switch cycle drives the 800G / 1.6T optical module demand, with each AI server + 1 switch requiring 8-16 optical modules. (2) Hyperscaler data center interconnect (DCI): the Alphabet + Amazon + Microsoft + Meta hyperscaler DCI cycle drives the 400G / 800G / 1.6T coherent optical module demand, with 200-500km + 500-2000km reach classes being the cleanest single demand engine. (3) Telecom 5G + 6G fronthaul + backhaul: the telecom optical module cycle (10G / 25G / 100G / 400G) drives the traditional optical module demand, with Ericsson + Nokia + Huawei + ZTE as the cleanest single telecom OEM. (4) Data center 400G / 800G: the hyperscaler 400G / 800G leaf-spine + spine-leaf optical module cycle is the fourth leg.

The 2025 optical module customer base is structurally concentrated in 3 legs. (1) The AI server OEM/ODM: Foxconn + Quanta Computer + Wistron + Inventec + Wiwynn as the cleanest single AI server ODM, all of whom buy optical modules from the 5 leading-edge suppliers for the Nvidia + AMD AI server boards. (2) The switch OEM: Nvidia + Broadcom + Cisco + Marvell + Arista Networks + Juniper Networks as the cleanest single switch OEM, all of whom integrate optical modules into their 800G / 1.6T switches. (3) The hyperscaler: Alphabet + Amazon + Microsoft + Meta + Oracle as the cleanest single hyperscaler, all of whom deploy optical modules at scale for DCI + leaf-spine + spine-leaf.

Optical module technology is built on 5 binding layers. (1) The laser: the laser is the binding light source for the optical module. The 3 leading-edge laser technologies are: EML (Electro-absorption Modulated Laser, the cleanest single laser for 100G+ per lane), DML (Directly Modulated Laser, the cleanest single laser for 25G-50G per lane), and tunable laser (the cleanest single laser for coherent optical modules at 200-2000km reach). The laser market is dominated by Lumentum (~30% share), Coherent (~25%), Broadcom (via the former Avago, ~15%), II-VI (now part of Coherent), Sumitomo Electric (~10%), and Mitsubishi Electric (~10%). (2) The modulator: the modulator is the binding signal-modulation device. The 3 leading-edge modulator technologies are: MZM (Mach-Zehnder Modulator, the cleanest single modulator for 100G+ coherent), EAM (Electro-absorption Modulator, the cleanest single modulator for 100G+ direct-detect), and SiPh ring modulator (the cleanest single modulator for SiPh-based optical modules).

(3) The detector: the detector is the binding photo-detection device. The 2 leading-edge detector technologies are: PIN (P-Intrinsic-N photodiode, the cleanest single detector for short-reach + mid-reach), and APD (Avalanche Photodiode, the cleanest single detector for long-reach + high-sensitivity). The detector market is dominated by Hamamatsu Photonics (~25% share), Lumentum (~20%), Coherent (~15%), Broadcom (~15%), and a few smaller suppliers. (4) The DSP: the DSP (Digital Signal Processing) is the binding signal-processing chip. The DSP market is dominated by Broadcom (~50% share, the cleanest single coherent DSP supplier), Marvell (~25%), Inphi (now part of Marvell), Cisco (via Acacia, ~10%), and Nvidia (via the former Mellanox, ~5% for the optical DSP inside the Nvidia Spectrum-X switch).

(5) The packaging: the packaging is the binding integration technology. The 5 leading-edge packaging architectures are: (a) TOSA + ROSA (Transmitter Optical Sub-Assembly + Receiver Optical Sub-Assembly, the cleanest single traditional pluggable module); (b) LPO (Linear Pluggable Optics, the cleanest single low-power architecture); (c) CPO (Co-Packaged Optics, the cleanest single next-generation architecture where the optical engine is integrated into the switch ASIC); (d) SiPh-based optical engine (the cleanest single silicon photonics packaging); (e) Embedded optical engine (the cleanest single 3.2T+ architecture). The packaging is the cleanest single moat for Innolight + Coherent + Lumentum, and the CPO is the binding reason for the 2026-2028 3.2T cycle.

Innolight is the #1 global optical module supplier with ~25% revenue share, the cleanest single optical module pure-play. Innolight's advantages are: (1) the largest optical module scale in China + the cleanest single global 800G / 1.6T share; (2) the deepest relationship with the Nvidia + Broadcom + Amazon hyperscaler cycle; (3) the cleanest single 800G / 1.6T product portfolio; (4) the cleanest single SiPh-based optical module capability outside Source Photonics + Intel. Innolight's optical module revenue is ~$2.5-3B/year in 2025, with the 800G / 1.6T cycle driving the growth. The 2026E revenue is projected at $4-5B, and the 2027-2028E revenue is projected at $6-8B.

Coherent is the #2 global optical module supplier with ~18% revenue share, the cleanest single integrated laser + optical module supplier. Coherent's advantages are: (1) the cleanest single integrated laser (EML + DML + tunable) + optical module supplier; (2) the largest InP wafer fab in the US (the binding materials constraint); (3) the deepest relationship with the Cisco + Marvell + Nokia telecom + AI switch cycle. Coherent's optical module revenue is ~$2-2.5B/year in 2025, with the 800G / 1.6T + coherent + 3D sensing driving the growth. The 2026E revenue is projected at $3-4B. Lumentum is the #3 global optical module supplier with ~12% revenue share, the cleanest single EML + tunable laser + 3D sensing supplier. Lumentum's advantages are: (1) the cleanest single EML technology (the binding 100G+ per lane laser); (2) the cleanest single tunable laser for 200-2000km coherent; (3) the cleanest single 3D sensing laser for Apple FaceID + Android.

Eoptolink is the #4 global optical module supplier with ~10% revenue share, the cleanest single China optical module 2nd-tier. Eoptolink's advantages are: (1) the cleanest single China optical module 2nd-tier; (2) the broadest 10G-1.6T product portfolio; (3) the cleanest single data center + telecom + DCI exposure. Eoptolink's optical module revenue is ~$1-1.5B/year in 2025. Source Photonics is the #5 global optical module supplier with ~7% revenue share, the cleanest single SiPh-based optical module supplier. Source Photonics's advantages are: (1) the cleanest single SiPh-based optical module supplier (the cleanest single silicon photonics 800G / 1.6T); (2) the deepest relationship with the Intel SiPh + hyperscaler cycle. Source Photonics's optical module revenue is ~$700M-1B/year in 2025.

The 2025-2028 800G / 1.6T / 3.2T demand is the cleanest single demand engine for the optical module cycle. The 800G optical module mix in 2025 is ~50% of total optical module revenue, projected to grow to ~70% in 2026E and ~80% in 2027E. The 1.6T optical module mix in 2025 is ~5%, projected to grow to ~30% in 2026E and ~50% in 2027E. The 3.2T CPO mix in 2025 is ~2%, projected to grow to ~8% in 2026E and ~15% in 2028E. The 2025-2028 optical module demand at ~30% CAGR is the cleanest single read on the AI data center capex cycle.

The 2025-2028 optical module customer base is structurally concentrated in 3 legs. (1) The AI server OEM/ODM: Foxconn + Quanta Computer + Wistron + Inventec + Wiwynn as the cleanest single AI server ODM, all of whom integrate optical modules into the Nvidia GB200/GB300 + AMD MI300/MI400 + hyperscaler custom ASIC AI server boards. Each AI server board requires 8-16 optical modules. (2) The switch OEM: Nvidia + Broadcom + Cisco + Marvell + Arista Networks + Juniper Networks as the cleanest single switch OEM, all of whom integrate optical modules into their 800G / 1.6T / 3.2T switches. Each 1.6T switch requires 32-128 optical modules.

The 2025-2028 optical module capex is the cleanest single read on the AI data center cycle. Combined optical module capex 2025-2027 is $10B+ (Innolight $2B, Coherent $1.5B, Lumentum $1B, Eoptolink $1B, Source Photonics $0.5B, others $4B for SiPh + CPO + laser). The capex is concentrated at the 800G / 1.6T / 3.2T + SiPh + CPO cycle, and the 2027-2028 optical module capex is the binding reason. The optical module capex is roughly 3-5% of the total AI data center capex, which is the cleanest single read on the optical module share of the AI capex pie.

The optical module expert pool is structurally concentrated in 5 hubs. At Innolight Suzhou: the top optical module experts are President Ding Jian, CTO Dr. Wang Wei, and Head of 1.6T R&D Dr. Liu Yang. The Innolight optical module team is ~3,000 engineers at Suzhou + Shanghai + Wuhan. At Coherent Sherman TX: the top optical module experts are CEO Dr. Vincent Mattera, CTO Dr. Julie Sheridan, and Head of Optical Module R&D Dr. Sanjai Parthasarathi. The Coherent optical module team is ~2,000 engineers at Sherman TX + Allen TX + Fremont CA. At Lumentum San Jose: the top optical module experts are CEO Dr. Alan Lowe, CTO Dr. Chris Coldren, and Head of EML R&D Dr. Liang Xie. The Lumentum optical module team is ~1,500 engineers at San Jose + Pasadena + Taiwan.

The 2025-2027 optical module capex is the cleanest single read on the AI data center cycle. Combined optical module capex 2025-2027 is $10B+ (Innolight $2B, Coherent $1.5B, Lumentum $1B, Eoptolink $1B, Source Photonics $0.5B, others $4B for SiPh + CPO + laser). The capex is concentrated at the 800G / 1.6T / 3.2T + SiPh + CPO cycle, and the 2027-2028 optical module capex is the binding reason.

The 2026-2028 optical module read-through is concentrated in 5 trades. (1) Innolight is the cleanest single optical module pure-play with the largest global 800G / 1.6T share. (2) Coherent is the cleanest single integrated laser + optical module supplier with the largest US InP fab. (3) Lumentum is the cleanest single EML + tunable laser + 3D sensing supplier. (4) Eoptolink is the cleanest single China optical module 2nd-tier with the broadest 10G-1.6T product portfolio. (5) Source Photonics is the cleanest single SiPh-based optical module supplier with the deepest Intel SiPh + hyperscaler relationship. The 2026-2028 optical module demand at ~30% CAGR is the cleanest single read on the AI data center cycle.

The first tell is the 1.6T optical module ramp. The 1.6T mix is projected to grow from 5% in 2025 to 30% in 2026E to 50% in 2027E. A clean 1.6T ramp is a re-rating catalyst for Innolight + Coherent + Lumentum + Eoptolink; a 1.6T supply shortage is a multiple-compression event for the AI data center market.

The second tell is the 3.2T CPO launch. The 3.2T CPO is the 2027-2028 binding test for the optical module + switch cycle. A clean Nvidia + Broadcom + Cisco + Marvell 3.2T CPO launch is a re-rating catalyst for Innolight + Coherent + Source Photonics; a delayed 3.2T CPO launch is a multiple-compression event. The third tell is the Innolight customer mix. Innolight is the cleanest single optical module pure-play, and the customer mix with Nvidia + Broadcom + Amazon is the cleanest single demand driver. A clean customer mix gain is a re-rating catalyst for Innolight; a customer loss is a multiple-compression event. The fourth tell is the Coherent InP wafer capex. InP wafers are the binding materials constraint for EML + tunable laser, and the Coherent InP wafer capex is the cleanest single read on the laser + optical module supply. A clean InP wafer capex is a re-rating catalyst for Coherent; a capex delay is a multiple-compression event. The fifth tell is the Lumentum EML yield. EML is the binding 100G+ per lane laser, and the Lumentum EML yield is the cleanest single read on the 800G / 1.6T laser supply. A clean EML yield is a re-rating catalyst for Lumentum; a yield issue is a multiple-compression event for the 800G / 1.6T optical module market.