专利检索 ap:("Xuefeng TANG" OR "Wing Chau NG" OR "Zhiping JIANG" OR "Zhuhong ZHANG") AND inv:"Wing Chau NG" 第 1 页

1.

发明申请
DEVICE AND METHOD FOR REAL-TIME CALIBRATION AND COMPENSATION FOR TRANSMITTER POWER IMBALANCE IN A COHERENT TRANSCEIVER 有权

公开(公告)号：US20220021463A1

公开(公告)日：2022-01-20

申请号：US16929962

申请日：2020-07-15

申请人： Xuefeng TANG , Wing Chau NG , Zhiping JIANG , Zhuhong ZHANG

发明人： Xuefeng TANG , Wing Chau NG , Zhiping JIANG , Zhuhong ZHANG

IPC分类号： H04B10/564 , H04B10/548 , G02F1/21

摘要： Methods and devices for power imbalance compensation and calibration of a coherent transmitter or transceiver are described. A pilot tone is combined with a digital data signal such that relative amplitudes of the pilot tone in each of four transmitted optical data channels may be detected by a pilot tone detector and used to calculate any power imbalances between I/Q phase channels and/or X/Y polarized channels of the transmitter. The pilot tone detector applies gain to the data signal of the transmitter to compensate for any calculated power imbalances. Because the pilot tone is combined with the digital data signal, its amplitude in each received channel is proportional to the data signal power of that channel.

2.

发明申请
SELF-CALIBRATING DEVICE AND METHOD FOR IN-PHASE AND QUADRATURE TIME SKEW AND CONJUGATION IN A COHERENT TRANSMITTER 有权

公开(公告)号：US20220368512A1

公开(公告)日：2022-11-17

申请号：US17869350

申请日：2022-07-20

申请人： Xuefeng TANG , Qiang JIN , Wing Chau NG , Si OUYANG , Zhuhong ZHANG

发明人： Xuefeng TANG , Qiang JIN , Wing Chau NG , Si OUYANG , Zhuhong ZHANG

IPC分类号： H04L7/00 , H04B10/516

摘要： Methods and devices for IQ time skew and conjugation compensation and calibration of a coherent transmitter or transceiver are described. A pilot tone is combined with a digital data signal such that relative powers of the pilot tone in each of two frequency bands of the transmitted data signal may be detected by a pilot tone detector and used to calculate the time skew between I and Q modulation channels of the transmitter. A transmitter DSP applies IQ time skew bias to the data signal to compensate for any calculated IQ time skew. The pilot tone detector also provides the transmitter DSP with the information necessary to detect phase conjugation of the optical signal, which can be corrected by inverting the polarity of the data signal or changing the phase bias point of the optical modulator.