Patent ID: 7297976

Claim:
A method of fabricating an optoelectronic transmitter integrated circuit, comprising steps of: forming a sub-collector layer and a first semiconductor layer on a semi-insulating substrate; forming insulating patterns on the first semiconductor layer, the insulating patterns required for performing a selective metal organic chemical vapor deposition (MOCVD) process; forming a relatively thick MQW absorption layer in a first region of the exposed first semiconductor layer between the insulating patterns, and forming a relatively thin MQW insertion layer in a second region of the exposed first semiconductor layer outside the first region, by growing an MQW active layer in the first and second regions; removing the insulating patterns and forming a second semiconductor layer, a third semiconductor layer, and an ohmic layer on the exposed semi-insulating substrate; isolating the first region from the second region; forming a DHBT in the second region, the DHBT having the sub-collector layer, a collector layer formed of the first semiconductor layer, the MQW insertion layer, a base layer formed of the second semiconductor layer, an emitter layer formed of the third semiconductor layer, and the ohmic layer, which are sequentially stacked; and forming an EA modulator in the first region, the EA modulator having the sub-collector layer, a first clad layer formed of the first semiconductor layer, the MQW absorption layer, and a second clad layer formed of the second semiconductor layer.