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This paper proposes an optimized 16-chip multi-level phase-shifted optical code division multiplexing (OCDM) en/decoder for 4-level pulse amplitude modulation (PAM-4) format by using an amplitude-shaping (AS) technique. The optimized en/decoder can efficiently suppress the crosstalk and the primary beat noise (PBN). The code detection performance for 4-OCDM PAM-4 becomes the lowest to our knowledge. The numerical bit error rate analysis and the back-to-back simulation are shown. We also successfully demonstrate by computer simulation a 100 Gbps/<inline-formula> <tex-math notation="LaTeX">$\lambda $ </tex-math></inline-formula> enabling by 12.5 Gbaud 4-OCDM PAM-4 transmission in O-band over <inline-formula> <tex-math notation="LaTeX">$6\times 30$ </tex-math></inline-formula> km with in-line optical amplifiers.

Ultra-Low Crosstalk En/Decoder Using an Amplitude-Shaping Technique for 100 Gbps/λ OCDM-PAM-4 Transmission in O-Band