| 摘要 |
The device has a polarization divider producing two signals with orthogonal polarization states and phase setting devices and optical couplers producing a Q signal for the received signal. A first difference element receives the two parallel optical signals after the first coupler and derives a bipolar Q signal. A following control element controls one of the phase setting devices to minimize the Q signal, especially to null it. Independent claims are also included for the following: a method of setting the polarization of an incoming optical signal with modulated data to a defined polarization state, a processor unit, a programmable gate-array unit and a computer program for implementing the method. |
