Gigabit Single-Mode Optical Module Models

Gigabit single-mode optical modules are primarily categorized by fiber configuration, wavelength, and transmission distance, including single-fiber BiDi and dual-fiber SFPs for long-distance network connectivity.

Fiber Configuration

1. Dual-Fiber SFP Modules

• Use two fibers: one for transmitting and one for receiving.
• Typically have duplex LC interfaces.
• Compatible with single-mode fiber (SMF) for long-distance links.
• Transmission distances range from 10 km to 40 km, depending on the module type and wavelength ( ).
• Common standards include 1000BASE-LX/LH for 10 km and 1000BASE-ZX for 40 km ( ). 2. Single-Fiber BiDi (Bidirectional) SFP Modules
• Use one fiber for both transmitting and receiving by employing different wavelengths for each direction.
• Interface types are usually LC or SC.
• Transmission distances can reach up to 160 km with OS2 single-mode fiber ( ).
• Ideal for scenarios where fiber availability is limited or cost reduction is needed.

Wavelength and Standards

• 1000BASE-LX/LH: Operates at 1310 nm, suitable for long-distance single-mode links up to 10 km ( ).
• 1000BASE-ZX: Operates at 1550 nm, supports distances up to 40 km ( ).
• 1000BASE-BX10-D/U: BiDi modules using single-strand SMF, with distances typically up to 10 km ( ).
• 1000BASE-BX40-D/U: BiDi modules for 40 km single-fiber links ( ).

Temperature Ratings

• Commercial (0°C to 70°C): Suitable for indoor environments like enterprise computer rooms.
• Extended (-20°C to 85°C) and Industrial (-40°C to 85°C): Designed for outdoor or harsh environments with wide temperature fluctuations ( ).

Applications

• Gigabit single-mode SFP modules are widely used in switches, routers, firewalls, servers, and storage devices.
• They are suitable for data center interconnections, campus networks, and metropolitan area networks.
• BiDi modules are particularly useful for fiber-limited deployments or FTTx applications ( ).

Summary

Gigabit single-mode optical modules offer flexibility in fiber usage, wavelength, and distance, allowing network engineers to select the appropriate module for long-distance, high-reliability, and cost-efficient deployments. Choosing between dual-fiber and single-fiber BiDi modules depends on fiber availability, distance requirements, and environmental conditions.