What is optic transceiver

The rapid development of the Internet in the 21st century has led to an explosive growth of IT business. The increase in the transmission capacity of communication networks has gradually revealed the disadvantages of the traditional electrical interconnection communication system, which has promoted the development of optical fiber communication technology. important technology. Optical modules are indispensable for the interconnection of optical networks within the center. With the increase in the number and density of ports, half of the cost of optical networks in data centers will be occupied by optical modules. The optical module plays the role of photoelectric conversion in the optical fiber communication system. It is the core device of the Ethernet physical media layer (as shown in Figure 1.1).

It can convert the electrical signal to be transmitted into the transmitted optical signal and send it to the optical fiber link, and then the optical module at the B side converts the transmitted optical signal into an electrical signal through the photoelectric conversion function and transmits it to the B-side host, thus realizing A. , Efficient communication between B-side and different places.

Types of 1g transceiver

Optical modules have been developed for decades, there are many types, and there are several classification standards, such as classification according to different packaging forms, different application fields, transmission rates of optical modules, and emission or reception wavelengths, among which the most The important classification is encapsulation.

The following is an introduction to the current types of optical modules according to the packaging type of optical modules:

 GBIC (Gigabit Interface Converter) was quite popular in the 1990s. It is designed to be hot-swappable and uses an SC interface. Due to the flexibility of interchange, gigabit switches designed with GBIC interface once occupied a large share in the market. It can be said that GBIC is the first optical transceiver module with standardized packaging interface, which has a milestone and epoch-making status. SFP is the abbreviation of Small Form-factor Pluggable, which can be understood as an upgraded version of GBIC. The volume is twice as small as that of GBIC, and its unit area is twice as many ports as GBIC modules. SFP modules are also called miniaturized GBICs (MINI-GBICs). Other functions of SFP modules are basically the same as GBIC modules, and are generally used in SONET/SDH networks, 100M/Gigabit Ethernet and other high-speed transmission applications.

Test of optic module

The high-frequency characteristics of optoelectronic devices mainly include two aspects: large-signal dynamic characteristic test and small-signal frequency response characteristic test. Among them, the principle research of small optical module and the development of test platform The signal frequency response describes the transmission of the device at different frequencies. Characteristics and reflection characteristics, while the large-signal dynamic test describes the transmission characteristics of the device at different rates. For small-signal research, the test results reflect the linear responsivity of the device, while the large-signal test results reflect the nonlinear characteristics of the device. . The main test indicators of the optical module introduced in the previous section include the average transmittedtransmitted optical power and optical eye diagram of the transmitted optical signal at the transmitting end, and the sensitivity, bit error rate, and electrical eye diagram of the receiving end performance test. These technical indicators determine the optical module. In addition, the experiments in this chapter also study the optical module impedance and cut-off frequency and other information. QSFPTEK has complete optical module testing equipment, welcome to consult.

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