Rogers C E, Carini J L, Pechkis J A, Gould P L
Department of Physics, University of Connecticut, Storrs, CT 06269, USA.
Opt Express. 2010 Jan 18;18(2):1166-76. doi: 10.1364/OE.18.001166.
We utilize various techniques to characterize the residual phase modulation of a waveguide-based Mach-Zehnder electro-optical intensity modulator. A heterodyne technique is used to directly measure the phase change due to a given change in intensity, thereby determining the chirp parameter of the device. This chirp parameter is also measured by examining the ratio of sidebands for sinusoidal amplitude modulation. Finally, the frequency chirp caused by an intensity pulse on the nanosecond time scale is measured via the heterodyne signal. We show that this chirp can be largely compensated with a separate phase modulator. The various measurements of the chirp parameter are in reasonable agreement.
我们运用多种技术来表征基于波导的马赫-曾德尔电光强度调制器的残余相位调制。采用外差技术直接测量因强度的给定变化而引起的相位变化，从而确定该器件的啁啾参数。通过检查正弦幅度调制的边带比也可测量此啁啾参数。最后，经由外差信号测量纳秒时间尺度上强度脉冲所引起的频率啁啾。我们表明，这种啁啾可通过一个单独的相位调制器得到很大程度的补偿。啁啾参数的各种测量结果吻合得较为合理。
