SFP is a relatively late optical module, but it is also the most widely used optical module product.
SFP (Small Form-factor Pluggables) Many people understand it as an upgraded version of GBIC. SFP volume is reduced by at least half of the GBIC optical module, Video SFP and more than twice the number of ports can be configured on the same panel. As the SFP module in function and GBIC basically the same, therefore, Video SFP some switch manufacturers are also known as miniaturized GBIC (Mini-GBIC).
GBIC and SFF in the development of optical modules have had a very extraordinary history, with the rapid development of the network, they are gradually replaced by SFP.
SFP is the development of SFF and GBIC optical modules, because SFF and GBIC is 1X9 optical module after the two directions of the development of products, have their own advantages: miniaturization and hot swap.
SFP optical module inherited the GBIC hot-swappable features, but also learn from the advantages of SFF miniaturization. Using LC head, the volume is only GBIC module 1/2 to 1/3, greatly increased the port density of network equipment to adapt to the rapid development of the network trend, so get the most extensive application, the main Equipment manufacturers, without exception, to abandon the GBIC products, Video SFP only use SFP optical module products. As a result of a unified standard, the manufacturers of SFP products can be compatible, SFP products can be used as a separate network equipment procurement.
Although there have been many higher-tech, updated optical module products, but SFP will continue to exist for a long time. After SFP, the development of optical modules is mainly toward a higher rate of development, now has appeared 10G, 40G, 100G and other optical modules. Which SFP + optical module is believed to be SFP after the widely used generation of products.
In the field of optical communication, SFP transceiver module as a standard pluggable device, because of its small size, mechanical and optical interface standard unified, Video SFP pluggable and other flexible configurable features, has been widely used in system equipment. In order to make the VOA module as flexible and configurable as the SFP transceiver module to the system equipment, this paper presents a method of integrating the VOA module into the SFP package, using the SFP standard mechanical and optical interface, so that the VOA module can also be like SFP transceiver module as plug and play, very convenient to achieve the choice of light attenuation function.
Due to the SFP package, the volume is limited, and the VOA based on the micro-electromechanical system (MEMS) technology is characterized by its small size, simple control, Video SFP Better optical performance. Therefore, this paper uses MEMS VOA module to achieve SFP package of digital adjustable attenuator.