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A light source can have some optical bandwidth (or linewidth), meaning the width of the optical spectrum of the output. For narrow
How much bandwidth does the optical module have
The maximum bandwidth of commercially emerging optical modules is currently 1.6 terabits per second (Tbps), with 3.2 Tbps modules under development.
Current Optical Module Bandwidths
Modern optical modules are designed to meet the growing demands of hyperscale data centers, AI workloads, and high-speed cloud networks. The most common high-performance modules include:
- 400G modules: Typically use 4 lanes at 100G each with PAM4 modulation, achieving a total bandwidth of 400 Gbps per module .
- 800G modules: Double the bandwidth of 400G modules, often using 8 lanes at 100G or 4 lanes at 200G, providing ~30–40% better power efficiency per bit .
- 1.6T modules: Emerging modules designed for AI-scale data centers, using advanced form factors like OSFP-XD or OSFP-224 with lane speeds of 224 Gbps, achieving 1.6 Tbps per module .
- 3.2T modules: Currently in research and development, expected to leverage further lane aggregation and silicon photonics integration to reach 3.2 Tbps .
Factors Affecting Maximum Bandwidth
- Lane Count and Speed: Optical modules achieve higher bandwidth by increasing the number of parallel lanes and the data rate per lane. For example, QSFP-DD and OSFP form factors support multiple lanes to scale bandwidth efficiently .
- Modulation Techniques: PAM4 (4-level pulse amplitude modulation) is widely used in high-speed modules, effectively doubling the data rate per lane compared to traditional NRZ modulation .
- Form Factor and Integration: New form factors like OSFP-XD and QSFP-DD allow higher lane density and better thermal management, enabling higher aggregate bandwidths .
- Optical and Electrical Limits: The achievable bandwidth also depends on the optical fiber type, transmitter and receiver technology, and signal integrity considerations .
Summary
Currently, 1.6 Tbps optical modules represent the maximum deployable bandwidth in commercial or near-commercial systems, primarily targeting AI and hyperscale data centers. 3.2 Tbps modules are under development and expected to become available in the next few years. The maximum bandwidth is determined by a combination of lane count, modulation format, form factor, and optical/electrical design constraints, with PAM4 and multi-lane architectures being key enablers of these high data rates .
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