A 25 Gb/s, 4.4 V-Swing, AC-Coupled Ring Modulator-Based WDM Transmitter with Wavelength Stabilization in 65 nm CMOS

作者：Li Hao^*; Xuan Zhe; Titriku Alex; Li Cheng; Yu Kunzhi; Wang Binhao; Shafik Ayman; Qi Nan; Liu Yang; Ding Ran; Baehr Jones Thomas; Fiorentino Marco; Hochberg Michael; Palermo Samuel; Chiang Patrick Yin

来源：IEEE Journal of Solid-State Circuits, 2015, 50(12): 3145-3159.

DOI：10.1109/JSSC.2015.2470524

• AC-coupled
• CMOS
• FFE
• high-swing driver
• ring modulator
• silicon photonics
• thermal tuning
• transmitter
• WDM

Silicon photonics devices offer promising solution to meet the growing bandwidth demands of next-generation interconnects. This paper presents a 5 x 25 Gb/s carrier-depletion microring-based wavelength-division multiplexing (WDM) transmitter in 65 nm CMOS. An AC-coupled differential driver is proposed to realize 4 x VDD output swing as well as tunable DC-biasing. The proposed transmitter incorporates 2-tap asymmetric pre-emphasis to effectively cancel the optical nonlinearity of the ring modulator. An average-power-based dynamic wavelength stabilization loop is also demonstrated to compensate for thermal induced resonant wavelength drift. At 25 Gb/s operation, each transmitter channel consumes 113.5 mW and maintains 7 dB extinction ratio with a 4.4 Vpp-diff output swing in the presence of thermal fluctuations.

• 出版日期2015-12