Silicon PAM-4 optical modulator driven by two binary electrical signals with different peak-to-peak voltages

We demonstrate a silicon PAM-4 optical modulator, which is based on a symmetric Mach-Zehnder interferometer. Two uncorrelated binary electrical signals with different peak-to-peak voltages are applied to the phase shifters of the silicon optical modulator. Accordingly, two different phase shifts are generated in the two arms. After the permutation, there are totally four phase differences between the two arms and the output optical power has four levels. The device can work at 32 Gbaud in the wavelength range from 1525 nm to 1565 nm, which is promising for the next-generation high-speed silicon optical link.

[1]  Xinwan Li,et al.  Linearity Measurement and Pulse Amplitude Modulation in a Silicon Single-Drive Push–Pull Mach–Zehnder Modulator , 2016, Journal of Lightwave Technology.

[2]  M. Paniccia,et al.  A continuous-wave Raman silicon laser , 2005, Nature.

[3]  Alireza Samani,et al.  Silicon Photonic Segmented Modulator-Based Electro-Optic DAC for 100 Gb/s PAM-4 Generation , 2015, IEEE Photonics Technology Letters.

[4]  M. Paniccia,et al.  A high-speed silicon optical modulator based on a metal–oxide–semiconductor capacitor , 2004, Nature.

[5]  William M. J. Green,et al.  Monolithic 56 Gb/s silicon photonic pulse-amplitude modulation transmitter , 2016, 1608.07563.

[6]  Guo-Qiang Lo,et al.  High-efficiency Si optical modulator using Cu travelling-wave electrode. , 2014, Optics express.

[7]  Po Dong,et al.  High-speed low-voltage single-drive push-pull silicon Mach-Zehnder modulators. , 2012, Optics express.

[8]  Xiaoyan Wang,et al.  Low-power-penalty wavelength multicasting for 36  Gbit/s 16-QAM coherent optical signals in a silicon waveguide. , 2014, Optics letters.

[9]  F. Karinou,et al.  Directly PAM-4 Modulated 1530-nm VCSEL Enabling 56 Gb/s/ $\lambda $ Data-Center Interconnects , 2015, IEEE Photonics Technology Letters.

[10]  Sethumadhavan Chandrasekhar,et al.  224-Gb/s PDM-16-QAM modulator and receiver based on silicon photonic integrated circuits , 2013, 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC).

[11]  Yonghui Tian,et al.  Ultra-low-power carrier-depletion Mach-Zehnder silicon optical modulator. , 2012, Optics express.

[12]  J. Michel,et al.  High-performance Ge-on-Si photodetectors , 2010 .

[13]  Guo-Qiang Lo,et al.  High-Speed Silicon Modulator With Slow-Wave Electrodes and Fully Independent Differential Drive , 2014, Journal of Lightwave Technology.

[14]  A. Bogoni,et al.  Optical Multicasting of 16QAM Signals in Periodically-Poled Lithium Niobate Waveguide , 2013, Journal of Lightwave Technology.

[15]  Jinzhong Yu,et al.  High-speed, low-loss silicon Mach-Zehnder modulators with doping optimization. , 2013, Optics express.

[16]  M. Lipson,et al.  High performance germanium photodetectors integrated on submicron silicon waveguides by low temperature wafer bonding. , 2008, Optics express.

[17]  R. Soref,et al.  The Past, Present, and Future of Silicon Photonics , 2006, IEEE Journal of Selected Topics in Quantum Electronics.