| 摘要 |
<p>The present invention discloses a device and method for locking demodulator phase in a Differential Phase Shift Keying (DPSK) receiver, wherein, the demodulator is used to demodulate the DPSK optical signal and then send the demodulated signals to a balanced receiver; the balanced receiver is used to transform the two paths of demodulated DPSK optical signals into electric signals, separate one part of the monitoring electric signals from the two paths of electric signals respectively, send them to a multiplier, and output the other part of the monitoring electric signals after difference amplifying; the multiplier performs multiplication operation for the two paths of the monitoring electric signals sent by the balanced receiver, and sends the operation result to a demodulator control unit as a feedback signal; the demodulator control unit is used to monitor the feedback signal outputted by the multiplier and instruct the phase adjusting direction of the demodulator according to the feedback signal. The present invention can directly enable the combination of rough modulation and fine modulation of the demodulator phase in the DPSK receiver and greatly optimize the control solution of the DPSK receiver.</p> |
