C-band 312Gbps PAM8 Transmission Over 30km SMF Using Integrated Optical Dispersion Compensator

Intensity modulation-direct detection (IM/DD) technology is considered a low-cost, high-capacity, and low-latency solution for short-reach optical connection applications such as data center networks (DCNs) and passive optical networks (PONs), but chromatic dispersion (CD) is the main factor limiting transmission distance. The development of silicon photonics technology has greatly reduced the size of optical dispersion compensators (ODCs) and is expected to replace traditional dispersion compensation fibers. In this paper, we demonstrate a compact ODC based on an on-chip chirped waveguide Bragg grating (CWBG) that simultaneously achieves large dispersion and wide bandwidth. On-chip ODC-enabled C-band beyond 200Gbps net data rate PAM4/PAM8 transmission over 30km single-mode fiber (SMF), and optical vestigial sideband (VSB) PAM4 signal transmission over 25km SMF, are demonstrated with simple receiver digital signal processing (DSP) and low latency.