A novel laser diodes' driver was introduced.Using only 4 discrete NPN double polysilicon bipolar transistors and one conventional silicon bipolar transistor as active devices

the driver can provide 50 mA modulation current to drive laser diodes for a load of 25Ω and can provide 2.5 V modulation voltage to drive EA modulators for a load of 50Ω.The driver has the rise/fall time of less than 100 ps and can be used for bit rate up to 3 Gb/s with the modulation and the bias current of 5~50 mA respectively.