Optical module single-port dual-port speed
Single-port (BiDi) and dual-port optical modules support similar high-speed data rates, but differ in fiber usage and deployment flexibility.
Overview of Single-Port (BiDi) Modules
Single-port, or BiDi (bidirectional) optical modules, transmit and receive data over a single fiber using two different wavelengths (e.g., TX1310/RX1550 and vice versa) and require a matched pair at both ends of the link . They are commonly used when fiber resources are limited. Typical speeds for BiDi SFP modules include 1G, 10G, and 25G, depending on the module type and standard (SFP, SFP+, SFP28), . BiDi modules are cost-effective for long-distance links without laying additional fiber, with transmission distances ranging from 2 km to over 120 km depending on single-mode or multi-mode fiber .
Overview of Dual-Port Modules
Dual-port, or duplex optical modules, have separate transmit (TX) and receive (RX) ports, requiring two fibers for a single link . They are easier to deploy because any two modules can connect without wavelength matching. Dual-port modules also support a wide range of speeds, including 1G, 10G, 25G, 40G, 100G, and 400G, depending on the form factor (SFP, SFP+, QSFP, QSFP28) and fiber type . Transmission distances vary: multimode fibers typically support up to 2 km, while single-mode fibers can reach up to 160 km for 1G SFP modules .
Speed Considerations
- SFP (1G): Both single-port and dual-port modules support 1 Gbps.
- SFP+ (10G): Supports 10 Gbps; BiDi modules are available for 10G but require wavelength pairing.
- SFP28 (25G): Supports 25 Gbps; dual-port modules are more common for high-speed links due to easier deployment.
- Higher speeds (40G/100G/400G): Typically use multi-lane QSFP modules, which are inherently dual-port or multi-fiber designs .
Key Differences
| Feature | Single-Port (BiDi) | Dual-Port (Duplex) |
|---|---|---|
| Fiber usage | 1 fiber | 2 fibers |
| Wavelength | Requires matched pair | Any two modules can connect |
| Deployment | Saves fiber, cost-effective | Easier setup, flexible |
| Typical speeds | 1G, 10G, 25G | 1G, 10G, 25G, 40G, 100G, 400G |
| Distance | 2–120 km (SMF) | 2–160 km (SMF) |
Summary
Both single-port and dual-port optical modules can support high-speed data transmission, but single-port BiDi modules are ideal for fiber-limited scenarios, while dual-port modules offer easier deployment and broader compatibility for high-speed networks. Choosing the right module depends on network speed requirements, fiber availability, distance, and device compatibility .
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