| 摘要 |
Disclosed is a coherent receiver, comprising: a frequency offset estimation unit and a frequency offset compensation unit. The frequency offset estimation unit is configured to receive signal light and local oscillator light. The signal light passes through an etalon and then is received by a first photoelectric detector to obtain a first current intensity value, and the signal light is received by a second photoelectric detector to obtain a second current intensity value. The local oscillator light passes through the etalon and then is received by a third photoelectric detector to obtain a third current intensity value, and the local oscillator light is received by a fourth photoelectric detector to obtain a fourth current intensity value. The frequency offset compensation unit is configured to obtain, according to a ratio of the first current intensity value to the second current intensity value, a first ratio, obtain, according to a ratio of the third current intensity value to the fourth current intensity value, a second ratio, and obtain, according to a difference between the first ratio and the second ratio, frequency offset values of the signal light and the local oscillator light. The above technical solution achieves frequency offset estimation of a coherent system, and reduces the cost of the coherent system. |
