BiDi SFP & SONET SFP & FC SFP
BiDi SFP, known as Bi-Directional SFP, is the fiber optic transceiver for over 1 gigabit data transmission. The core technology of this kind of transceiver is BiDi transmission which uses Wavelength Division Multiplexing (WDM) technique for bidirectional transmission of two different waves with only one optical fiber. Since the BiDi module just has one port , it must be employed in pairs. For example, when one port is used for receiving 1310nm and transmitting 1550nm optical signals, the other should receive 1550nm and transmit 1310nm signals, and vice versa. In this way, BiDi products usually cost more money than ordinary ones, but it is a better way to use BiDi transceivers to save the optical fiber expenditure.
Synchronous Optical Networking (SONET) SFP or Synchronous Digital Hierarchy (SDH) SFP is a kind of transceiver based on the SONET/SDH standard. SONET is the physical standard for fiber optical transmission, first brought out by Bellcore in 1980s and then standardized by American National Standards Institute (ANSI) for the popularization in the whole world. In the SONET standard, it mainly stipulates the transmission rate, fiber interface, operation and maintenance in optical fiber transmission. With the help of SONET, the communication device around the world can connect with each other, which greatly improved the efficiency of fiber communication.
Fiber Channel (FC) SFP is the transceiver using the technology of fiber channel for the high speed optical signal transmission. Fiber channel is a mature technology for serial interface standardized by American National Standards Institute (ANSI), it is applied for the connection between the storage controller and computer drivers. Nowadays, FC has played as a replacement for the Small Computer System Interface (SCSI) in high-performance storage systems, because fiber channel is faster in transmission speed, and more flexible in the transmitting mode with or without fiber in accordance with the transmission range.