Structure and principle of compact optical module
Compact optical module is mainly composed of TOSA module, ROSA module and PCBA board according to hardware classification. The following is the structure and principle of optical module.
1. Optical emission module TOSA. Optical emission module is the main component of optical emission module, in which the light source laser diode is the core.
2. Receiving component ROSA, the function of the receiving component is to convert the weak optical signal after transmission into electrical signal, and to amplify and reshape the original input electrical signal. The receiving component, ROSA, is composed of a photo detector and a front (Trans resistive) amplifier and other components enclosed in a tight structure. The commonly used ROSA is PIN-TIA and APD-TIA.
3. PCBA board. PCBA is composed of optical emission circuit and receiving circuit.
Can compact optical module be used in SFP+ slot?
Compact optical modules can run in SFP+ slots, but SFP+ optical modules cannot run in compact light slots. SFP+ ports generally do not support speeds below 1G. In other words, we cannot insert 100BASE SFP optical module on SFP+ port. In fact, for this problem, it depends a lot on the switch model.
However, SFP+ optical modules are not automatically compatible to 1G to support SFP optical modules. Unlike copper SFP available in 10/100/1000 automatic compatibility, optical fibers such as SFP and SFP+ do not support automatic compatibility. Although it is possible to use a compact optical module on the SFP+ port in many cases, this does not mean that its insertion into the SFP+ port automatically supports 1G. In a fiber optic link, it may not work if we insert the compact optical module on one SFP+ port (1G) and then on the other SFP+ port (10G).
When use compact optical modules and SFP+ optical modules in a network, make sure that both ends of the fiber link have the same speed. The compact optical module can be used in the SFP+ port, but the compact optical module cannot be connected to the SFP+ optical module.
