Journal
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
Volume 69, Issue 3, Pages 1159-1170Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSI.2021.3127723
Keywords
Optical transmitters; Optical modulation; Optical signal processing; Modulation; Topology; Capacitors; Voltage; CMOS; silicon-photonics; push-pull; high-swing; distributed driver; optical interconnects; NRZ; PAM-4; Mach-Zehnder modulator (MZM); extinction ratio (ER); feed-forward equalizer (FFE); artificial transmission line (T-line)
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Funding
- National Key Research and Development Program of China [2019YFB2204702]
- National Natural Science Foundation of China [61874115]
- Pioneer Hundred Talents Program, Chinese Academy of Sciences
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This article presents a reconfigurable silicon-photonics transmitter for short-reach optical interconnects, combining a 65-nm CMOS driver with a 180-nm SOI-CMOS silicon-photonic Mach-Zehnder Modulator. The transmitter achieves high modulation efficiency and data rates with low power consumption.
This article presents a reconfigurable silicon- photonics transmitter (TX) for short-reach optical interconnects. The proposed hybrid-integrated TX combines a 65-nm CMOS driver with a 180-nm SOI-CMOS silicon-photonic Mach-Zehnder Modulator (MZM). The driver integrated with in-segment fractional-UI spaced feed-forward equalizer (FFE) is proposed to support the non-return-zero (NRZ) signaling, electrical- and optical-domain 4-level pulse-amplitude modulation (PAM-4) signaling. The driver employs a reconfigurable distributed topology to achieve high swing, wide bandwidth and flexible operation. The MZM is driven differentially in a push-pull configuration for high modulation efficiency. Measurement results show that the proposed TX operates up to 50-Gb/s NRZ data rate with 4-Vppd swing and 1.92-ps RMS jitter. In the optical PAM-4 mode, it reaches 56-Gb/s data rate and achieves >5-dB extinction ratio (ER) at the cost of 10.9-pJ/bit power efficiency.
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