Quasiheterodyne optical fiber sensor with automated adjustment of the driving wave parameter

A novel quasiheterodyne fiber sensor is proposed, in which the heterodyne output can be obtained only by injecting a staircase current with four steps into a laser diode. Moreover, in this sensor system the parameter of the staircase current can be automatically adjusted to the ideal value to obtain high accuracy. The experimental setup constructed has operated successfully. Error analyses were also carried out.