Experimental demonstration of 100 Gb/s single‐fiber bidirectional transmission over 40 km using multi‐wavelength BOSA for 6G networks and data‐center interconnections

Abstract We experimentally demonstrate 100 Gb/s bidirectional transmission over 40 km using a multi‐wavelength bidirectional optical sub‐assembly (BOSA) based on a single bidirectional multi‐wavelength Mux/Demux. The Mux/Demux consists of an optical zig‐zag glass block and thin film filters. Four wavelengths with 800 GHz spacing (that is, two wavelengths for each direction) within a 20‐nm band in the O‐band are utilized, and there is no four‐wave mixing penalty. The multi‐wavelength BOSA enables the bidirectional transmission of 2 × 50 Gb/s PAM4 signals over a 40‐km single‐fiber link. The multi‐wavelength BOSA with multi‐level modulation presents a suitable approach for future speed and transmission distance increases in 6G networks and data‐center interconnections.