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


Silicon photonics devices supply promising solution to satisfy the growing bandwidth demands of next-generation interconnects. This paper presents a five × 25 Gb/s carrier-depletion microring-based wavelength-division multiplexing (WDM) transmitter in sixty five nm CMOS. An AC-coupled differential driver is proposed to comprehend four × VDD output swing also tunable DC-biasing. The proposed transmitter incorporates a pair of-faucet uneven pre-emphasis to effectively cancel the optical nonlinearity of the ring modulator. An average-power-primarily based dynamic wavelength stabilization loop is also demonstrated to make amends 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 V$_rm pp-diff$ output swing in the presence of thermal fluctuations.

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