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Timestamp: 2019-04-25 04:38:14+00:00

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Fig. 1 Flip-chip integrated chip-on-board silicon photonic all CMOS driver integrated modulator. The blow-up picture shows a 3-port CMOS ring modulator with GSG bonding pads.
Fig. 2 Resonance spectrum at different bias voltages of a CMOS carrier depletion ring modulator.
Fig. 3 Ring modulator device performance: (a) measured ring modulator EO frequency response at 1V reverse bias; (b) 5Gbps “eye” diagram of the modulator driven by un-terminated RF probe, showing an extinction ratio of 3dB with a 2V swing at the device.
Fig. 4 Carrier depletion CMOS ring modulator small-signal circuit model.
Fig. 5 Curve fitting for measured S11 of the ring modulator at 1V reverse bias using the circuit model in Fig. 4.
Fig. 6 Cascode modulator driver circuits with 2V voltage swing.
Fig. 7 Schematic view of the insertion of the integrated transmitter into a clocked digital link.
Fig. 8 90nm CMOS driver chip with 330 digitally clocked low power modulator drivers, high speed digital I/Os and other test circuitry.The blow-up shows the GSG pads of one modulator driver with under-bump metallization.
Fig. 9 Schematic of hybrid modulator and driver chip integration using micro bumps.
Fig. 10 Photos of the hybrid chip assembly, with VLSI driver chip facing up in (a) and down in (b). (c) is a photo of the integrated transmitter, showing hybrid bonded VLSI driver chip (facing up) and modulator chip (facing down) wire bonded on a test PCB.
Fig. 11 Driver-integrated modulator thermal stability measurement results indicating stable operation possible with simple passive thermal management.
Fig. 12 The high speed performance characterization results of the integrated “all” CMOS silicon photonic modulator. (a)“Eye” diagram of the modulator output at 5Gbps; (b) 10dB power penalty compared to commercial LiNbO3 modulator.
Table 1 Circuit parameters extracted for the depletion ring modulator at different bias voltages.
Table 2 Measured ring resonance wavelength in 2 hours.
Circuit parameters extracted for the depletion ring modulator at different bias voltages.
Measured ring resonance wavelength in 2 hours.

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