A cost-effective 2.5 Gb/s/λ Bi-directional coherent UDWDM-PON with computationally-efficient DSP

A 2.5Gb/s/λ bi-directional coherent UDWDM-PON is demonstrated with 4-ASK modulation using heterodyne detection. The frequency offset tolerance is around 6 GHz within 0.5-dB penalty, and no EDFA is needed in either ONU or OLT.

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