There are 4 categories of modules and receiving modules, and the research object of this paper is mainly the optical transceiver module. Main functions of optical module
It is to complete the electrical-optical/optical-electrical conversion of optical signals. Optical modules consist of optoelectronic devices, optical interfaces and functional circuits, etc.
Composition, the optoelectronic device consists of two parts: emission and reception.
In the industry, the optical module refers to the hot-swappable small package optical module, which is used on the port of the device.
Optical modules that can be hot-swapped during operation are mainly used to connect devices (generally referred to as switches or routers)
The electrical signal in the device) is converted into an optical signal, and then sent out through an optical fiber (transmitted by the optical module
At the same time, it can receive the optical signal emitted by an external optical fiber and convert it into an electrical signal (through optical
The receiver implementation of the module), input to the device
Types of 25g/40g/100g transceiver
SFP28 is suitable for a single 25GE access port. SFP28 module, based on SFP+ package, supports
Support 25G Ethernet standard. SFP28 can provide 25Gb/s error-free transmission over Category 4 multimode fiber
The transmission distance can reach 100 meters, and can be used in high-density 25G Ethernet switches and network interfaces, promoting
server connection into the data center. It uses today’s popular SFP+ package to upgrade 10G for enterprises to
An Ethernet connection provides a more cost-effective solution (as shown in Figure 2.2f).
QSFP is a four-channel small form-factor pluggable optical module, which is a shortened form of Quad Small Form-factor Pluggable.
Write, with four independent full-duplex transmit and receive channels, (as shown in Figure 2.2g).
The packaging method of the 100G QSFP28 optical module is the same as that of the 40G QSFP+ optical module, and both use 4 optical modules.
The difference is that the transmission rate of each Fibre Channel of the 100G QSFP28 optical module is the highest.
High energy up to 28Gbps, mainly used for 100G transmission applications. Compared with 100G CFP optical modules, QSFP28 optical modules are more suitable for high-density wiring and are widely favored by most data centers. 100G
The QSFP28 optical module first appeared in 2013. After several years of development, it has derived many categories of suitable optical modules.
different transmission applications (as shown in Figure 2.2h).
Apart from SFP and QSFP packages, CFP should be the most common package form in optical modules. in CFP
C stands for 100 in Roman numerals, so CFP is mainly aimed at 100G (also 40G) and above
rate application. The CFP family mainly includes CFP/CFP2/CFP4/CFP8, of which CFP8 is still in the development stage.
Unlike the additional numbers 10 and 28 after QSFP which represent speed grades, the numbers after CFP represent updates
Replacement, more compact size (except CFP8), higher speed and higher density.
Conclusion
At present, the non-return-to-zero (NRZ) code transmission method is generally used in optical transport networks, but when the transmission rate exceeds 28Gbit/s
When the system has strict requirements on the time margin of the transmission link and the transceiver chip, and the high-bandwidth signal is in the channel
losses will also increase significantly. This requires us to change the choice of the modulation format of the channel transmission signal.
As the next-generation access network high-speed signal interconnection technology, the PAM4 (fourth-order pulse amplitude) modulation method has become the most
Preferred choice. QSFPTEK offers pam4 modulation transceivers. Contact us now.
