Abstract

The generation and reusing of a self-pulsated optical RZ carrier is demonstrated to achieve bi-directional OC-768 transmission with downstream return-to-zero binary phase-shift keying (RZ-BPSK) and reused upstream return-to-zero ON–OFF keying (RZ-OOK) data formats at 40-Gbit/s. The self-started optical RZ carrier is generated by linking a single-mode laser with a nonlinearly biased Mach–Zehnder modulator based self-feedback loop, which is externally modulated to transmit the downstream RZ-BPSK and reused to transmit the upstream RZ-OOK. By lengthening the true-time delay in the self-feedback loop with a 900-m long SMF, the self-started 40-GHz photonic-microwave clock with an ultralow SSB phase noise of –160 dBc/Hz at an offset frequency of 100 kHz could suppress its relative timing jitter to 2 fs for obtaining a $Q$ -factor as high as 5 × 10 $^{16}$ . Both the photon-microwave clock and optical RZ carrier can be triggered to achieve bi-directional downstream RZ-BPSK and upstream reused RZ-OOK transmissions with receiving power sensitivities of –15.7 and –12.3 dBm, respectively, at a requested BER of 10 $^{-9}$ . The bi-directional downstream RZ-BPSK data reveals a comparable BER performance with the uni-directional case by a power penalty of only 0.5 dB, whereas the power penalty between uni- and bi-directional upstream RZ-OOK data is up to 3 dB.

© 2014 IEEE

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