It is desirable to simplify process,lower cost and improve characteristics of the integrated optoelectronic functional devices.A novel technique named as selective area growth double stacked active layer(SAG-DSAL) was introduced.A monolithically integrated and electro-absorption modulated distributed feedback laser was developed with this technique.The SAG-DSAL electro-absorption modulated laser(EML) chip′s threshold current is 20 mA,optical output power is 10 mW at an injection current of 100 m...