A well isolation trenches for a CMOS device and the method for forming the same. The multiposition valve is controlled by the control unit of the engine. At least one stage of the sludge digestion system is operated at a thermophilic temperature above 50\xb0 C. lower dielectric layer and upper dielectric layer, and these layers are made of identical material to each other, and the material contains CaO and BaO, and the content of CaO is greater than that of BaO. The optical pulses primarily of the desired optical wavelength are injected into the second laser diode, and the second laser diode, stimulated by the injected optical signals, outputs optical pulses primarily of the desired optical wavelength.