Article Overview
Active Optical Cables (AOCs) are high-speed fiber-optic cables with integrated transceivers, supporting data rates from 10 Gbps up to 800 Gbps over distances ranging from 1 meter to 300 meters, depending on the application and form factor.
Overview
Active Optical Cables integrate electrical-to-optical (E-O) and optical-to-electrical (O-E) converters within the cable connectors, allowing standard electrical interfaces to transmit data over optical fiber. This design provides longer reach, improved signal integrity, and immunity to electromagnetic interference (EMI/RFI) compared to copper cables, while maintaining plug-and-play compatibility with standard form factors such as SFP+, QSFP+, QSFP28, QSFP-DD, OSFP, Mini-SAS HD, and USB Type-C .
Data Rates and Protocol Support
- Ethernet: 10 Gbps, 40 Gbps, 56 Gbps, up to 400 Gbps
- Fibre Channel: 8 Gbps, 10 Gbps
- InfiniBand: DDR, QDR, FDR
- SAS: SAS 3.0 (12 Gbps), SAS 4.0 (24 Gbps) for Mini-SAS HD AOCs
- PCIe: Gen 3 (8 Gbps) and Gen 4 (16 Gbps) support
- USB Type-C: Up to 10 Gbps, extending standard USB-C protocol up to 15 meters
Transmission Distance
- Short-range data center applications: 1–100 meters for multi-mode fiber (MMF) AOCs
- Extended USB Type-C applications: up to 15 meters with guaranteed performance
- High-performance configurations: some AOCs can reach up to 300 meters
Electrical and Optical Characteristics
- Power consumption: Typically lower than equivalent copper solutions, with integrated active circuits for signal amplification
- Bit Error Rate (BER): ≤10^-12 for high-speed SFP+ and QSFP+ AOCs
- Optical fiber: Multi-mode fiber is commonly used for data center applications, providing minimal attenuation and high bandwidth
- Laser sources: VCSELs or laser diodes convert electrical signals to optical signals at the transmit end, while photodiodes convert them back at the receive end
Form Factors and Connectors
- SFP+ for 10 Gbps short-range links
- QSFP+, QSFP28, QSFP-DD, OSFP for 40–400 Gbps high-density applications
- Mini-SAS HD and CXP2 for enterprise storage and high-speed server interconnects
- USB Type-C AOC for extending USB-C protocols over longer distances
Advantages
- High-speed transmission with low latency
- Longer reach than copper cables for equivalent data rates
- EMI/RFI immunity and enhanced security
- Lightweight and flexible, ideal for high-density environments
- Plug-and-play installation without additional transceivers or patch panels AOCs are widely used in data centers, HPC clusters, storage systems, and enterprise networking, providing a reliable, high-performance alternative to traditional copper cabling while supporting evolving high-speed protocols and standards .
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