An optical pulse splitting-delaying device based on optical fiber was proposed for the replication of a high-speed analog pulse in the measurement system for high-speed optical pulses. Comparing with other optical pulse splitting-delaying devices, its virtues are low loss and small amplitude deviation between pulses. In the following, the power of output pulses from the device and its affect factors are analyzed theoretically. Simulation and optimal analyses indicate that the amplitude of the minimal output pulse can be increased and the amplitude deviation between pulses as a result of nonzero uniformity can be decreased by choosing appropriately uniformity of each 2×2 fiber coupler and arranging reasonably the connection order of those fiber couplers.