An integrated optical device with a loop resonator is provided, having at least one closed waveguiding loop which has losses. The HBT includes a base including a doped silicon-germanium alloy base region, an emitter including doped silicon and laterally contacting the base, and a collector including doped silicon and laterally contacting the base. The system allows locking and releasing doors by either operating the conventional locking system of the door or the universal electromechanical strike locking system. In the raised position, a gap is formed between the screed and the first conveyor so that crop material passes into the bale formation chamber. The slave terminating resistor is operably connected to the slave switch. The invention also concerns processes for preparing these derivatives and novel intermediates used in the preparation of these derivatives.