1. Background and Status (November 2025)

metric	Actual situation (November 2025)	remarks
mainstream data center rate	800G mass deployment, 1.6T in small-scale pilot testing phase	Google, Meta, and AWS have deployed 800G DR4/FR4 modules in certain network links, with 1.6T samples undergoing testing in cloud vendor laboratories.
Mainstream packaging	Primarily QSFP-DD800 and OSFP800; OSFP1.6T prototype has emerged	The OSFP's thermal performance advantage drives its increased adoption in the 1.6T prototype.
electrical interface	8×50G PAM4 (800G); the 1.6T prototype uses either 8×100G PAM4 or 4×200G PAM4	All systems utilize DSP-based CDR (Continuous Data Recording).
optical interface	Single-wavelength 100G PAM4 (DR4), CWDM4/8 (FR4)	1.6T prototype multi-purpose silicon photonic CWDM8 or EML array
Key challenges	DSPs have high power consumption (typically 16-18W for 800G models, and 25-30W for 1.6T prototypes), thermal management, and cost considerations.	Cloud vendors are tightening power efficiency and density requirements, driving LPO/CPO exploration

2. Overview of the Technical Roadmap (Text-based Flowchart)

2023 ──► 2024 ──► 2025 (present) ──► 2026~2027 ──► 2028~2030 ──► 2031+

│ │ │ │ │ │

400G becomes mainstream, 800G enters mass production, 800G scales up deployment, 1.6T begins commercialization, CPO/LPO expansion? (possibly 3.2T)

(DSP) (DSP) +1.6T prototype verification (LPO/Silicon Photonics-driven) (co-packaged configuration) (status undetermined)

3. Key Technology Directions (as of November 2025)

3.1 Rate Evolution Path (Based on IEEE 802.3dj and OIF Latest Developments)

time nodes	target rate	channel velocity	optical wavelength scheme	state （2025.11）
2024	800G	8×50G PAM4	100G λ × 8 (DR8) or 4λ × 200G (FR4)	commercial
2025	800G deployment scale + 1.6T prototype	8×100G PAM4 / 4×200G PAM4	200G wavelength × 8 (DR8) or CWDM8	1.6T sample delivery/pilot
~2027	1.6T commercial	May maintain 8×100G PAM4 or introduce PAM6 (uncertain)	Significant Advantages of Silicon Optical CWDM	Commercialization
≥2030	3.2T	16×200G (uncertain) or 8×400G (uncertain)	or may require relevant miniaturization solutions	Research phase

3.2 Evolution of Packaging Form

Encapsulation type	Current (2025.11) mainstream rate	future applicability	technical essential
QSFP-DD800	800G	Extensible to 1.6T (requires enhanced cooling)	Hot-swappable compatible with existing switches
OSFP	800G / 1.6T prototype	The 1.6T engine demonstrates significant thermal management advantages.	The larger housing facilitates high-power dissipation
CPO	Pilot deployment (AI/HPC)	≥1.6T high-density, low-power scenarios	Concurrent sealing reduces PCB loss, but decreases maintainability
LPO	2025 Prototype Verification	Power Saving in Short Distance Data Center	To eliminate DSP, a laser with high linearity is required.

4. Market-driven and challenges (November 2025 perspective)

Driving factors

AI/large model computing power requirements: 800G → 1.6T, with the deployment cycle shortened to 2-3 years

Green Energy Policy: Promoting LPO/CPO Pilot in Low-power Scenarios

Standardization Advancement: IEEE 802.3dj (1.6T) and OIF CEI-224G Continuously Promoted

Key challenges

Power Consumption and Heat Dissipation of DSP: The 1.6T Prototype's Power Consumption Approaches 30W, Heat Dissipation Becomes a Bottleneck

Cost pressure: High-speed EML and silicon photolithography tape costs are high, with yield climbing in progress.

Supply chain risk: High-end DSP and EML chips are concentrated in a few manufacturers

5. Conclusion and Projections (Based on November 2025)

Technology roadmap: By November 2025,800G will achieve large-scale deployment, while 1.6T will enter small-scale pilot testing. Limited commercialization is expected in 2026-2027, with LPO and silicon photonics serving as key cost and energy efficiency drivers.

The encapsulation form factor remains viable for 1.6T devices, though power consumption and density constraints are driving some scenarios toward LPO/CPO solutions.

Core technology: Silicon photonics integration is the primary approach to resolve the bandwidth-power trade-off; LPO can reduce module power consumption by approximately 30% over short distances (actual performance varies by design).

Manufacturing and Testing: With the increasing adoption of COB/Flip-Chip technologies, testing now requires higher bandwidth and more sophisticated FEC/BER verification.

Risks and opportunities: While new technologies offer advantages, the pace of implementation is constrained by supply chain consolidation and standardization progress (with an uncertain timeline).

6. Reference (Public information as of November 2025)

· LightCounting, Optical Transceiver Market Report Q3 2025

· Yole Développement, Silicon Photonics Update 2025

· OIF, CEI-224G Implementation Agreement Rev 0.5, Oct 2025

· IEEE 802.3dj Task Force Meeting Minutes, Sep 2025

·'public disclosures: Innolight 1.6T OSFP Demo (OFC 2025), Broadcom DSP Roadmap 2025, and Cisco CPO Field Trial Results Q32025

Future Technology Roadmap of Optical Modules: From 800G to 1.6T and Beyond