We propose and demonstrate an OCDMA-PON scheme with optical network unit (ONU) internetworking capability, which utilizes low-cost gain-switched Fabry-Pérot (GS-FP) lasers with external dual-wavelength injection as the pulse sources on the ONU side. The injection-generated optical pulses in two wavelengths from the same GS-FP laser are used separately for the PON uplink transmission and ONU internetworking. Experimental results based on a two-user OCDMA system confirm the feasibility of the proposed scheme. With OCDMA technologies, separate ONU-internetworking groups can be established using different optical codes. We also give experiment results to analyze the performance of the ONU-ONU transmission at different power of interference signals when two ONU-internetworking groups are present in the OCDMA-PON.

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A novel data remodulation scheme with downstream Amplitude Shift Keying (ASK)-Differential Phase Shift Keying (DPSK) signals and on-off keying (OOK) upstream signal using reflective semiconductor optical amplifier (RSOA) for wavelength-division multiplexing (WDM)-passive optical networks (PON) is proposed in the letter. An experiment on 10-Gb/s DPSK with 1.25-Gb/s ASK downstream signals generation and 1.25-Gb/s upstream signal remodulation is demonstrated, and experimental results show error-free operation after ~25-km transmission can be achieved without dispersion compensation.

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