23.5 A dual 64Gbaud 10kΩ 5% THD linear differential transimpedance amplifier with automatic gain control in 0.13µm BiCMOS technology for optical fiber coherent receivers

Long-haul optical links are experiencing a transition to coherent techniques because they enable the use of modulation techniques with high spectral efficiency, such as QPSK and QAM [1], which in turn require highly linear low-noise optical-electrical front-ends. To cope with the ever-growing demand for high data rates in the consumer market, the Ethernet standard for long-haul optical links is moving soon from 100 to 400Gb/s. A possible candidate symbol rate to reach this bit rate using complex modulation formats is 64Gbaud.

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