The invention discloses a two-dimensional electron gas (2DEG) quantum box based on an electric field limited range, which is used for an IC (integrated circuit) digital signal source of far infrared digital communication. The 2DEG quantum box is used for pumping of a semiconductor laser to obtain far infrared emission rudiment unit structures in different wavelengths; the 2DEG quantum box is expected to have an integration application on digital light source fabrication on the digital infrared integrated communication; and an infrared communication light source IC that is wide in band and high in integration level, is driven by low voltage, and has a communicational physical bandwidth superior to 1000T is obtained.