Characterization of Silicon Mach-Zehnder Modulator in 20-Gbps NRZ-BPSK Transmission

Kazuhiro GOI  Kenji ODA  Hiroyuki KUSAKA  Akira OKA  Yoshihiro TERADA  Kensuke OGAWA  Tsung-Yang LIOW  Xiaoguang TU  Guo-Qiang LO  Dim-Lee KWONG  

IEICE TRANSACTIONS on Electronics   Vol.E96-C   No.7   pp.974-980
Publication Date: 2013/07/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E96.C.974
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Advances in Integrated Photonic Devices)
silicon modulator,  silicon photonics,  phase shift keying,  opto-electronic integrated circuit,  

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20-Gbps non return-to-zero (NRZ) – binary phase shift keying (BPSK) using the silicon Mach-Zehnder modulator is demonstrated and characterized. Measurement of a constellation diagram confirms successful modulation of 20-Gbps BPSK with the silicon modulator. Transmission performance is characterized in the measurement of bit-error-rate in accumulated dispersion range from -347 ps/nm to +334 ps/nm using SMF and a dispersion compensating fiber module. Optical signal-to-noise ratio required for bit-error-rate of 10-3 is 10.1 dB at back-to-back condition. It is 1.2-dB difference from simulated value. Obtained dispersion tolerance less than 2-dB power penalty for bit-error-rate of 10-3 is -220 ps/nm to +230 ps/nm. The symmetric dispersion tolerance indicates chirp-free modulation. Frequency chirp inherent in the modulation mechanism of the silicon MZM is also discussed with the simulation. The effect caused by the frequency chirp is limited to 3% shift in the chromatic dispersion range of 2 dB power penalty for BER 10-3. The effect inherent in the silicon modulation mechanism is confirmed to be very limited and not to cause any significant degradation in the transmission performance.