Electrically and continuously tunable optical delay line based on a semiconductor laser

This investigation experimentally demonstrates the feasibility of the electrically and continuously tunable optical delay line using a semiconductor laser. The time delays for a 10 Gbps data signal are electrically delayed by adjusting the bias current of laser, and the maximum delay is approximately 41 ps. We also measure the bit error rate against the receiver power by various bias currents and wavelength detuning (δλ). Measurements are made to verify the feasibility to use in optical communication systems.