| 摘要 |
An apparatus and a method for control the driving amplitude of Differential Quadrature Phase Shift Keying (DQPSK) transmitter are disclosed by the present invention, wherein said method includes: a DQPSK modulator modulates the optical signal emitted from a continuous spectrum optical source to which modulated signals is not added; a modulator feedback control unit is connected with the first bias point, the second bias point and the third bias point, and controls the first bias point, the second bias point and the third bias point according to a part of the optical signal which is modulated by the DQPSK modulator; control the driving amplitude of the driver I according to the temperature change of the driver I; control the driving amplitude of the driver Q according to the temperature change of the driver Q. The application of the present invention can simplify the complexity of the control circuit in the DQPSK transmitter, while adding pilot signals on the driving amplitude of the driver is not needed, therefore redundant optical signal-to-noise ratio cost would not be generated. |
