發送接口輸入一定碼率的電信號，經過內部的驅動芯片處理后由驅動半導體激光器(LD）或者發光二極管（LED）發射出相應速率的調制光信號，通過光纖傳輸后，接收接口再把光信號由光探測二極管轉換成電信號，并經過前置放大器后輸出相應碼率的電信號。
華為光模塊SFP/XENPAK/GBIC等系列的型號及描述：
SFP-GE-T
SFP電口模塊(1.25Gb/s-100M-RJ45)
ESFP-GE-SX-MM850升級版
ESFP多模光模塊(850nm-1.25Gb/s-550M-LC)
SFP-GE-LX-SM1310-A
SFP單模光模塊(1310nm-1.25Gb/s-10KM-LC)
SFP-GE-LH40-SM1310
SFP單模光模塊(1310nm-1.25Gb/s-40KM-LC)
SFP-GE-LH40-SM1550
SFP單模光模塊(1550nm-1.25Gb/s-40KM-LC)
SFP-GE-LH70-SM1550
SFP單模光模塊(1550nm-1.25Gb/s-70KM-LC)
XENPAK-SX-MM850
XENPAK多模光模塊(850nm-10.3Gb/s-300M-SC)
XENPAK-LX-SM1310
XENPAK單模光模塊(1310nm-10.3Gb/s-10KM-SC)
XENPAK-LH40-SM1550
XENPAK單模光模塊(1550nm-10.3Gb/s-80KM-SC)
XFP-SX-MM850
XFP多模光模塊(850nm-10.3Gb/s-300M-LC)
XFP-LX-SM1310
XFP單模光模塊(1310nm-10.3Gb/s-10KM-LC)
XFP-LH40-SM1550-F1
XFP單模光模塊(1550nm-10.3Gb/s-40KM-LC)
SFP-GE-LX-SM1310-BIDI
BIDI SFP單模光模塊(TX1310/RX1490nm-1.25Gb/s-10KM-單LC)
SFP-GE-LX-SM1490-BIDI
BIDI SFP單模光模塊(TX1490/RX1310nm-1.25Gb/s-10KM-單LC)
SFP-FE-SX-MM1310-A
SFP多模光模塊(1310nm-125Mb/s-2KM-LC)
SFP-FE-LX-SM1310-A
SFP單模光模塊(1310nm-125Mb/s-10KM-LC)
SFP-FE-LH40-SM1310
SFP單模光模塊(1310nm-125Mb/s-40KM-LC)
SFP-FE-LH80-SM1550
SFP單模光模塊(1550nm-125Mb/s-80KM-LC)
GBIC-GE-SX-MM850-A
GBIC多模光模塊(850nm-1.25Gb/s-550M-SC)
GBIC-GE-LX-SM1310-A
GBIC單模光模塊(1310nm-1.25Gb/s-10KM-SC)
GBIC-GE-LH40-SM1550A
GBIC單模光模塊(1550nm-1.25Gb/s-40KM-SC)
GBIC-GE-LH70-SM1550-A
GBIC單模光模塊(1550nm-1.25Gb/s-80KM-SC)
GBIC-GE-T
GBIC電口模塊(1.25Gb/s-100M-RJ45)
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