SFP optical module is a SFP encapsulated hot-swappable small package module for Gigabit switches with SFP ports, which can be used to extend the data transmission of the entire network through single-mode and multimode fiber.SFP can be categorized by rate, wavelength, and mode. Currently, the highest rate of SFP optical module can reach 10.3G, LC interface.

SFP optical module is mainly composed of laser (including transmitter TOSA and receiver ROSA) and circuit board IC and external accessories, external accessories are PCBA, pull the ring, housing, base, sheet metal, rubber plug composition, generally to pull the color of the ring to distinguish the module's wavelength.SFP optical module is widely used in data centers, mobile base stations, passive wavelength division system, SAN/NAS, storage, 5G bearer network network. Storage, 5G bearer network network and other fields, many consumers will have such a question, why the SFP optical module is so widely used, SFP optical module and what advantages it has?

Figure:1.25G CSFP 1490TX/1310Rx 40KM

1.Definition of sfp module

sfp module is a small, high-density optical transceiver, usually used in a variety of network devices, such as routers, switches, firewalls, servers, etc., to achieve fast communication between different network devices, which is a solution for miniaturized fiber-optic interfaces, supporting transmission distances ranging from tens of meters to tens of kilometers. In addition, due to pluggability, users can replace or upgrade them without downtime, thus giving existing equipment new features.

2.Advantages of SFP Optical Module

1、Support hot-swappable

SFP optical module using the gold finger pin definition, so that the module works with different functional feet of the power up the sequence of different, to ensure that the SFP module in the case of the socket with power can be hot swappable use, to facilitate the maintenance of the system disk.

2, with digital diagnostic function (DDM)

Can be some of the relevant working parameters of the module for real-time monitoring and reporting, to monitor its working status.

3、Low cost

Optical transceiver module not only saves raw materials, but also saves working hours compared with the previous separated optical receiving and transmitting modules. Therefore, the optical transceiver module is the best solution to realize low-cost bidirectional transmission and optical interconnection.

4, miniaturization

SFP module size is not only smaller than a single optical transmitter module or optical receiver module, and because it uses the LC-type package of coaxial optical devices, its size is smaller than other packaging forms of optical transceiver module is even smaller, the installation of the system on the disk can also be more dense. In the component using integrated circuits to complete the transmitter module APC (power compensation), ATC (temperature compensation), drive, slow start protection and other functions as well as the receiver module of the pre-amplification, limiting amplification, signal alarms and other functions.

5、High reliability

IC and isolation are used in the component to ensure the reliability of the circuit. At the same time, the coaxial package of To tube shell is adopted to ensure the service life of the photoelectric device core. In the production process, the laser welding process is used to improve the reliability. The transmitter and receiver parts inside the module are completely independent, reducing the crosstalk between the two, making the module itself less interference and better performance.

In terms of application, sfp modules have the following characteristics:

Hybrid components: Through various standardized communication protocols, various SFP modules can be mixed with different speeds and link lengths.

Remote monitoring: Remote monitoring is possible, including performance information, alarms and pending events.

Adaptation to environment: sfp modules are typically used in indoor environments (28°C, 45%-75%).

3. Application Scenarios of sfp Module

The sfp module can be applied in the following situations:

LAN: SFP modules provide network managers with a direct connection to access layer switches.

Data centers: SFP modules are commonly used in data centers to connect to switches in order to expand the number of connections and provide high data transfer speeds.

WAN: SFP modules support data transmission between two locations for fast long-distance transmission.

4.Manufacturers of sfp module

According to the market demand and development trend, there are many manufacturers of sfp module in the market, such as Cisco, Huawei, 3COM, Pansi, Optical Xun, etc. These manufacturers are constantly improving their technology and launching new sfp module.

5. sfp module related technology

In the process of research and application of sfp module, the related technology is constantly progressing. The more common technologies at present are:

Optical integration technology: integrating components such as lasers, optical transponders and receivers together can realize advanced optical effects such as polarization fidelity and improve optical communication distance and speed.

DWDM technology: Adding a local oscillation signal to the optical channel can make the optical signals tightly arranged and improve the information throughput. At the same time, due to the use of DWDM technology, maintenance costs can be effectively saved.

Intelligent control technology: Using modern control tools and processors to combine various controllers of computer networks to realize the monitoring and control of sfp modules and improve the performance and durability of the equipment.

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