Single-megabit single-mode single-fiber transceiver

A single-megabit single-mode single-fiber transceiver is an optical module that transmits and receives data over a single strand of single-mode fiber at low data rates, typically for long-distance serial or Ethernet communication.

Overview

Single-mode single-fiber transceivers are designed to convert electrical signals into optical signals and vice versa over a single strand of single-mode fiber (SMF), which has a small core diameter of approximately 9/125 µm. These transceivers are optimized for long-distance communication with minimal signal loss, often supporting distances from 10 km up to 80 km, depending on the optical power budget and wavelength used . Unlike multimode transceivers, single-mode modules use laser-based transmission at wavelengths such as 1310 nm or 1550 nm to achieve reliable long-range connectivity .

Data Rate and Applications

For single-megabit applications, transceivers like the SEL-2830 support data rates up to 40 kbps to 1 Mbps, making them suitable for serial communication, industrial automation, protection systems, and instrumentation . These low-speed transceivers are ideal when electrical isolation, EMI/RFI immunity, and long-distance links are required. They are commonly used in EIA-232 or EIA-485 serial networks, connecting devices over distances that would be impractical with copper wiring.

Form Factor and Connectivity

Single-mode single-fiber transceivers are available in SFP (Small Form-factor Pluggable) modules for Ethernet or fiber networks, providing hot-swappable, flexible deployment . They typically use LC or ST connectors and can operate in bi-directional (BIDI) mode, where a single fiber carries both transmit and receive signals using different wavelengths (e.g., 1310 nm TX / 1550 nm RX) to maximize fiber efficiency . This makes them suitable for backbone links, campus networks, and metro fiber connections.

Advantages

• Long-distance transmission with low attenuation
• Electrical isolation from ground potential differences
• Resistance to electromagnetic interference
• Hot-swappable modules for easy network upgrades
• Flexible deployment in industrial, telecom, and enterprise networks

Example Products

• SEL-2830 Fiber-Optic Transceiver/Modem: Supports 0–40 kbps over single-mode fiber up to 80 km, ideal for serial data links .
• BlueOptics 37973061 100BASE-BX-U SFP: Single-mode LC simplex SFP supporting 155 Mbit/s over single-fiber BIDI links, suitable for switches, routers, and storage systems .
• 100 Mb/s Singlemode SFP Transceivers: Available from suppliers like Mouser, supporting Ethernet and fiber-optic networking applications . These transceivers are widely used in industrial automation, telecom, and enterprise networks where long-distance, low-latency, and reliable optical communication is required.