Last Updated on 2026 年 3 月 31 日 by 総合編集組
Taiwan’s Optical Interconnect Leadership: 800G Transceivers and Silicon Photonics Powering AI Data Centers
Introduction Taiwan has emerged as a critical player in the global optical communication supply chain, particularly as artificial intelligence drives explosive demand for high-bandwidth, low-power interconnects in data centers. With traditional electrical interconnects reaching physical limits due to signal attenuation and power consumption, optical solutions have become essential for scaling AI clusters.
Taiwan’s vertically integrated ecosystem — spanning compound semiconductor epitaxy, silicon photonics chip fabrication, high-speed SerDes design, advanced packaging, and optical transceiver assembly — positions it strongly to support the transition from 400G to 800G and beyond toward 1.6T solutions. This summary highlights key technologies, major companies, production status, and market insights based on industry developments.
Compound Semiconductor Epitaxy: The Foundation of Optical Signal Generation At the upstream of the optical supply chain, indium phosphide (InP) and gallium arsenide (GaAs) epitaxy provide the high-performance laser diodes and photodiodes required for efficient electro-optical conversion. LandMark Optoelectronics (聯亞光電) stands out as a leading supplier, delivering high-quality electro-absorption modulated laser (EML) wafers and continuous wave (CW) lasers tailored for 800G/1.6T modules and silicon photonics architectures. Traditional 800G pluggable modules often require eight 100G EML chips per unit, while silicon photonics designs increasingly rely on higher-power CW lasers. Thanks to decades of process optimization, LandMark maintains economically viable yields despite the stringent lattice-matching requirements of InP materials. Its products have been qualified by major cloud service providers (CSPs).
New companies like IntelliEPI (全新光電) focus on silicon photonics and co-packaged optics (CPO) epitaxy strategies, collaborating with downstream fiber component makers such as EZconn to optimize materials for CPO packaging characteristics from the wafer level. GCS (環宇-KY) benefits from growing demand for high-performance photodetectors and lasers, maintaining solid market share in 400G and 800G Ethernet applications even as silicon photonics advances.
A 2025 revenue growth overview shows strong momentum:
- LandMark Optoelectronics: 76.2% growth in InP/GaAs epitaxy for 800G/1.6T laser sources
- IntelliEPI: 53.8% growth with CPO heterogeneous integration focus
- GCS: 27.0% growth in laser and detector manufacturing for silicon photonics
These figures reflect the robust demand driven by AI infrastructure expansion.
Chip Design and Electronic Integration: The Role of SerDes Optical communication requires sophisticated electrical signal processing before and after the optical domain. High-speed Serializer/Deserializer (SerDes) converts GPU outputs into differential signals suitable for optical modulation. MediaTek (聯發科) and Realtek (瑞昱) are advancing toward 224Gbps PAM4 SerDes technology. MediaTek, through its Airoha subsidiary, has completed customer validation for 112Gbps SerDes and plans volume production in 2026, offering indigenous IP for 800G Ethernet equipment via heterogeneous integration with CPO solutions.
Alchip (世芯-KY) and GUC (創意電子) contribute at the system level. Alchip’s collaboration with Ayar Labs on the TeraPHY optical I/O chip, built on TSMC’s COUPE platform, delivers up to 100 Tb/s per AI accelerator by integrating optical interconnects directly into processor packaging. GUC focuses on thermal and routing management between high-bandwidth memory (HBM) and optical engines — critical for the dense I/O demands of the 1.6T era.
Wafer Foundry: TSMC’s Silicon Photonics Standardization TSMC has evolved from a pure-play foundry into a technology standard setter in silicon photonics. Its 65nm silicon photonics process leverages standard CMOS equipment to fabricate waveguides, modulators, and couplers, enabling cost-effective volume production. The COUPE (Compact Universal Photonic Engine) platform uses SoIC heterogeneous integration for 3D stacking of electronic ICs (EIC) and photonic ICs (PIC), achieving over 99% yield on engineering samples. This significantly reduces the cost of 800G CPO modules.
In 2025 demonstrations, TSMC showcased 200G micro-ring modulator (MRM) technology, which offers smaller footprint and lower power consumption compared to traditional Mach-Zehnder modulators (MZM). These advancements are expected to integrate fully into CoWoS advanced packaging by 2026, accelerating CPO commercialization.
Key TSMC platforms include:
- COUPE at 65nm PIC with MRM, WDM, and EIC (mass production, 3D stacking yield >99%)
- HPC SerDes at 5nm with 112Gbps support (mass production, low power and high integration)
- SoIC heterogeneous integration with sub-10μm pitch for reduced latency
Advanced Packaging and Testing: ASE and iST Solutions Packaging represents the final and most challenging step, requiring sub-micron alignment precision for optical coupling. ASE (日月光) offers comprehensive silicon photonics solutions through its VIPack platform, with two main CPO paths: Photonic FOPoP (fan-out package with optical chip above electronic chip using copper pillars for short signal paths) and 3D integration with TSV (through-silicon vias) for superior thermal management and support for over 200G per channel.
ASE collaborates with the Silicon Photonics Industry Alliance (SiPhIA) to standardize detachable fiber array units (FAU) and automated optical test equipment (ATE), aiming for fully automated mass production by 2027. iST (宜特科技) addresses testing bottlenecks with its Night Jar technology, enabling spatial-resolved insertion loss (IL) mapping to visualize loss points inside chips and capture hidden thermal hotspots, shortening validation cycles for 800G products.
Mass Production of Optical Transceivers: Taiwan’s 800G Real-World Performance 800G modules are transitioning from sampling to volume shipments. Two dominant form factors coexist: OSFP (larger with integrated heatsinks, higher thermal budget up to 15W+, preferred for NVIDIA InfiniBand AI clusters) and QSFP-DD (compact with backward compatibility for smoother Ethernet upgrades).
Leading Taiwanese module makers include:
- APAC Opto (前鼎光電): Full 800G OSFP lineup — SR8 (50m MMF with 850nm VCSEL), DR8 (500m SMF), and FR4 (2km with CWDM4 1271-1331nm) using MPO-12 or LC connectors.
- LuxNet (華星光): Strong expertise in high-power CWDM lasers (70mW in production, 100mW in development for 1.6T).
- Cwan (眾達-KY): High-yield 400G shipping while advancing 800G and CPO external laser source (ELS) products.
- NAFO (台北光纖): Taiwan-made 800G OSFP and QSFP-DD800 fully TAA-compliant, valued for supply chain security by US customers.
Example 800G OSFP specifications:
- B8BOFP8SRXTC: 800G, MMF, 50m, 850nm VCSEL
- B8BOFP8DRXTC: 800G, SMF, 500m, 1310nm parallel
- B8BOFP8FRXQC: 800G, SMF, 2km, CWDM4
QSFP-DD800 emphasizes compatibility with previous QSFP generations.
Terminal Interconnect Options: 800G AOC vs DAC For short-reach rack-internal and rack-to-rack connections, Active Optical Cables (AOC) and Direct Attach Cables (DAC) offer cost-effective alternatives to discrete modules. 800G DAC uses copper with near-zero power consumption and ultra-low latency (limited to ~2 meters), widely deployed by EZconn in AI server ToR (top-of-rack) links. 800G AOC provides greater flexibility for 3–100 meter distances, lighter weight, thinner profile, and immunity to electromagnetic interference (EMI), typically using PAM4 DSP with VCSEL technology for balanced performance and power.
User and Market Feedback Real-world insights from data center engineers highlight practical considerations. OSFP’s integrated heatsinks are favored when densely populating 1U switches with 36 modules due to superior airflow management. Taiwan-made products earn praise for higher DOM (digital optical monitoring) accuracy and supply chain reliability. Discussions around silicon photonics versus alternative platforms (e.g., POET) continue, with many noting that mature CMOS-based processes from leaders like TSMC deliver strong scale advantages. NVIDIA’s CPO demonstrations are noted, yet pluggable modules remain dominant in current volume production for easier maintenance and replacement.
Future Momentum and Challenges for Taiwan’s Optical Industry Taiwan’s optical communication sector benefits from three core trends: optics-to-chip integration (shrinking distances from pluggable to near-package optics and CPO), process fusion (bringing semiconductor manufacturing discipline to photonics for cost reduction), and geopolitical supply chain security. These strengths make Taiwan an essential accelerator for AI computing infrastructure.
Challenges remain in further yield improvement, development of sub-micron automated alignment tools, and cultivation of cross-disciplinary talent (electrical, optical, and thermal engineering). Addressing these will determine leadership in the upcoming 3.2T wave. As 800G products scale in 2026 and beyond, Taiwan’s position in the global AI optical interconnect ecosystem is expected to strengthen further.
Conclusion Taiwan’s comprehensive capabilities across the optical value chain — from epitaxy and chip design to packaging and modules — demonstrate its strategic importance in overcoming AI data center interconnect bottlenecks. Continued innovation in silicon photonics and CPO will help meet surging bandwidth demands while improving power efficiency. This overview provides a detailed yet accessible reference for understanding Taiwan’s contributions to next-generation AI infrastructure.
