Upcoming generations of coherent intra/inter data center interconnects currently lack a clear path toward a reduction of cost and power consumption, which are the driving factors for these data links. In this work, the tradeoffs associated with a transition from coherent C-band to O-band silicon photonics are addressed and evaluated. The discussion includes the fundamental components of coherent data links, namely the optical components, fiber link and transceivers. As a major component of these links, a monolithic silicon photonic BiCMOS O-band coherent receiver is evaluated for its potential performance and compared to an analogous C-band device.
We present a photonic BiCMOS coherent receiver dedicated to the O-band and achieve detection at up to 56 GBd using quadrature-phase shift-keying (QPSK) at various optical signal-to-noise ratios (OSNRs). Transmission experiments are performed and potential applications within that power budget are discussed.
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