At the end of the 1970s, optical fiber communication entered a practical stage, and various optical fiber communication systems were established.
Now the intensity modulation-direct detection system is still the most commonly used and the main communication method. Optical fiber communication system master
It consists of three parts: transmitter, fiber optic line and optical receiver. The core devices in the optical fiber communication system currently mainly include optical forwarding modules, optical transceiver modules and optical transmission modules.
Types of 1G 10G transceiver
Optical modules have been developed for decades, there are many types, and there are several classification standards.According to different packaging forms, different application fields, the transmission rate of the optical module, according to the emission or reception wavelength, etc. To classify, the most important classification is encapsulation. Transceiver provider usually offers all these types below. 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. Its design supports thermal
Plug and unplug use, using SC interface. Due to the flexibility of interchange, the gigabit switch designed with GBIC interface,
It has occupied a large share in the market. It can be said that GBIC is the first optical transceiver module with standardized packaging interface.
block, with milestone and epoch-making status (as shown in Figure 2.2a).
SFP is the abbreviation of Small Form-factor Pluggable, which can be understood as an upgraded version of GBIC.
The volume is twice smaller than that of GBIC, and its unit area is twice as many ports as GBIC modules. SFP modules are also used.
For miniaturized GBIC (MINI-GBIC). The other functions of the SFP module are basically the same as those of the GBIC module.
Used in SONET/SDH network, Fast/Gigabit Ethernet and other high-speed transmission applications (as shown in Figure 2.2b).
SFF (Small Form Factor) optical module is one of the earliest optical module products, the main business rate
At 2.5Gbps and below, its electrical interface has two specifications: 10pin and 20pin, two versions of the main data signal
No. interface is consistent. SFF is smaller in size than SFP and is soldered to the motherboard in the form of pins.
10G SFP+ optical module is an upgraded version of SFP optical module. The physical package of the two is the same. However, SFP+
The optical module can support the transmission rate of 10Gbps. Compared to other 10G optical modules such as Xenpak and
XFP optical module), SFP+ only retains the basic electro-optical and photoelectric conversion functions, reducing the original XFP design
The signal control function in the 10G optical module simplifies the design of the 10G optical module, the power consumption is also smaller, and the volume is the smallest.
It is most suitable for high-density port applications and becomes the most popular 10G optical module (as shown in Figure 2.2d).
CSFP (Compact-SFP) is a compact SFP, which is based on the popular SFP package.
A more advanced and compact CSFP package has been developed, as shown in Figure 2.2e.
The 300Pin module belongs to the first generation of 10G modules. Because the number of signals in the electrical interface increases, the electrical connection
The number of pins (PIN) of the connector has also increased a lot, so a 300-pin connector is used, which is the
origin of name. Both the 300Pin and the next generation XENPAK/XPAK/X2 integrate a serial-to-parallel conversion chip.
is called a Transponder (shown in Figure 2.2i).
Xenpak (10 Gigabit Ethernet Transceiver Package) is the first
A generation of optical modules; Xenpak can achieve transmission distances up to 10 km using G.652 single-mode fiber, suitable for
It is suitable for applications in the metro area, but the Xenpak is larger in size and consumes more power (as shown in Figure 2.2j).
Finisar joined about 10 companies to set up the XFP MSA and developed the XFP (10 Gigabit Small
Form Factor Pluggable) module specification. Compared with the previous 10G optical modules, XFP has the tightest form factor
Cheapest and cheapest. Due to the maturity of circuit pre-emphasis and equalization technology, serial and parallel are no longer placed in XFP modules
The conversion chip is no longer a Transponder, and the size of the optical device is also much smaller, and the IC integration is also higher.
Conclusion
From the development history of optical modules, we can see that as the network transmission capacity increases, the transmission rate increases.
High, the diversity of the packaging structure of optical modules has also been greatly increased, and the future development direction of optical modules will be high-speed, high-speed, small size, low power consumption, long distance and hot swappable. QSFPTEK offers Best Optical modules for SMB users. Conctac us now.