Abstract
Silicon Mach-Zehnder modulators (Si MZMs) with good linearity are designed and fabricated. 6.25 Gbaud Nyquist 16, 32 and 64-Quadrature Amplitude Modulation (QAM) optical signals were successfully generated by intensity modulation from the Si MZM, and the effective data rates are 22.61 Gb/s, 28.26 Gb/s and 33.91 Gb/s respectively. The subcarrier multiplexed technique and direct detection scheme were employed in this experiment. After 53.1 km transmission, the BERs of 16-QAM and 32-QAM are both below the 7% hard-decision forward error correction limit, while the back-to-back BER of 64-QAM is well below the 20% soft-decision forward error correction limit. These results demonstrated that the Si MZM can be used in the high-capacity low-cost short-haul intensity modulation and direct detection system.
Highlights
As the rapid expansion of multimedia service continues, the demand of network capacity keeps growing
Silicon Mach-Zehnder modulators (Si MZMs) with good linearity are designed and fabricated. 6.25 Gbaud Nyquist 16, 32 and 64-Quadrature Amplitude Modulation (QAM) optical signals were successfully generated by intensity modulation from the silicon Mach-Zehnder modulators (Si MZMs), and the effective data rates are 22.61 Gb/s, 28.26 Gb/s and 33.91 Gb/s respectively
After 53.1 km transmission, the BERs of 16-QAM and 32-QAM are both below the 7% hard-decision forward error correction limit, while the back-to-back BER of 64-QAM is well below the 20% soft-decision forward error correction limit
Summary
As the rapid expansion of multimedia service continues, the demand of network capacity keeps growing. Based on the depletion-type silicon Mach-Zehnder modulators (Si MZMs), the basic intensity modulation, On Off keying (OOK), was investigated previously [2,3], and the advanced modulation formats in coherent systems have been widely reported [4,5,6,7,8]. Direct detection optical Orthogonal Frequency Division Multiplexing (DDO-OFDM) data with advanced modulation formats of QPSK, 8PSK, and 16-QAM (effective data rates are 4.38 Gb/s, 2.60 Gb/s and 1.71 Gb/s), generated by using depletion-type Si MZM, have been transmitted over 50km [11]. We report the intensity modulation of 6.25 Gbaud Nyquist pulse shaping 16-QAM, 32-QAM, and 64-QAM signals using a depletion-type Si MZM based on plasma dispersion effect, achieving the effective data rates of 22.61 Gb/s, 28.26 Gb/s and 33.91 Gb/s, respectively. Considering the high peak-to-average-power-ratio of OFDM, which makes the whole system need a wider linear range, an alternative approach of using single carrier subcarrier multiplexed (SCM) Nyquist QAM signals [12] was chosen in this work
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