Views: 699 Author: Anna Publish Time: 2026-04-01 Origin: Site
Dual-fiber SFP optical modules are a common type of 1G SFP optical module. They employ a bidirectional transmission mechanism, with two independent channels or ports for data transmission and reception. One is the transmit port, and the other is the receive port. Both transmission and reception require a single optical fiber connection. Common wavelengths for 1G dual-fiber optical modules include 850nm, 1310nm, and 1550nm.
Single-fiber SFP optical modules, also known as BIDI optical modules, employ a unidirectional transmission mechanism with only one port. This fiber port is used for both transmission and reception, making single-fiber SFP optical modules an economical solution in scenarios with limited fiber resources. The wavelength range of single-fiber SFP optical modules varies between 1300nm and 1600nm.
Although both dual-fiber and single-fiber SFP optical modules can convert electrical signals to optical signals, they differ in transmission distance, fiber utilization, and usage methods.
1G SFP optical modules use both single-mode and multimode fiber to transmit data. Using multimode fiber, a 1G SFP optical module can transmit data up to 2km, while a single-mode SFP optical module can reach 160km.
For BIDI single-fiber SFP optical modules, this SFP module can be used with OS2 fiber optic cable or multimode fiber optic cable. Transmission distances are typically between 2km and 120km.
Dual-fiber SFP optical modules use a full-duplex interface (usually an LC interface), therefore requiring at least two fiber connections.
Single-fiber SFP optical modules can efficiently utilize a single fiber for bidirectional communication. If there is a 6-core fiber, all 6 cores can be used simultaneously, instead of 3 cores for one direction and 3 cores for the other. This means fewer fiber patch cords and patch panel ports can be used, and less space is needed for fiber management.
Dual-fiber 1G SFP optical modules operate at wavelengths of 850nm, 1310nm, and 1550nm. All SFP optical modules must be used in pairs. For common SFP optical modules, two SFP optical modules with the same wavelength should be connected together. For example, if an 850nm SFP optical module is used at one end, then an 850nm SFP optical module must also be used at the other end.
For single-fiber SFP optical modules, they must be deployed in pairs, just like common SFP optical modules. However, it is important to note that two duplex SFP optical modules with opposite wavelengths should be connected together. Common wavelengths for single-fiber SFP optical modules include TX1310/RX1550nm, TX1550/RX1310nm, TX1490/RX1550nm, TX1550/RX1490nm, TX1310nm/Rx1490nm, and TX1490nm/Rx1310nm. If we use a TX1310/RX1550nm single-fiber SFP optical module at one end, then a TX1550/RX1310nm single-fiber SFP optical module must be used at the other end.
The YXF-GE-M85L-05D is a high-performance, cost-effective module supporting transmission rates up to 1.25Gbps and a transmission distance of up to 550 meters over multimode fiber. This transceiver consists of two parts: the transmitting section contains a laser driver and an 850nm VCSEL laser; the receiving section contains a PIN photodiode, a transimpedance preamplifier (TIA), and a limiting amplifier. The module supports hot-swapping and can be connected via a 20-pin connector. The high-speed electrical interface is based on low-voltage logic with a nominal differential impedance of 100 ohms, and internal AC coupling is used.
The optical output can be disabled via the LVTTL logic high-level input of TX_DIS. The transmit fault (Tx_Fault) output indicates that the module transmitter has detected a fault related to laser operation or safety. The signal loss (RX_LOS) output indicates the loss of the receiver's input optical signal. The serial EEPROM in the transceiver allows users to access the transceiver's monitoring and configuration data via a two-wire SFP management interface. This interface uses a single address A0h, with its memory mapping divided into low and high zones. Basic digital diagnostic (DD) data is stored in the low zone, while specific data is stored in the high zone memory as a series of tables.
The YXF-GE-M31L-2D is a low-power, high-performance, and cost-effective module supporting data rates up to 1.25Gbps/1.0625Gbps and a transmission distance of 2km. It employs a 1310nm FP laser and a PIN/TIA receiver, featuring low jitter and high sensitivity. This module integrates TX_DIS control, TX-FAULT, and RX_LOS monitoring functions and complies with Class I laser safety standards.
YXFiber's YXF-GE-B35L-10D and YXF-GE-B53L-10D are high-performance, cost-effective bidirectional (BIDI) modules supporting data rates up to 1.25 Gbps over single-mode fiber and transmission distances up to 10 km. The transceiver consists of two parts: the transmitting section contains a laser driver and a 1310nm FP (1550nm DFB) laser; the receiving section contains a PIN photodiode, integrating a transimpedance preamplifier (TIA) and a limiting amplifier. The module supports hot-plugging and uses a 20-pin connector. The high-speed electrical interface is based on low-voltage logic circuitry, has a nominal differential impedance of 100 ohms, and employs internal AC coupling. The transceiver's internal serial EEPROM allows users to access the transceiver's monitoring and configuration data via a two-wire SFP management interface, meeting the needs of various application scenarios.
