In an optical fiber communication system, the input power to an all-optical nonlinear device in an optical regenerator is monitored and adjusted such that the regenerator operates at an optimized operation point. Also provided are the seeds of soybean variety XB004B12, cells from soybean variety XB004B12, plants of soybean XB004B12, and plant parts of soybean variety XB004B12. The pulse for measurement is inputted into the first latch circuit which latches an output of the object counter.