Bidirectional Transmission of Downstream Broadcast and Upstream Baseband Signals Over a Single Wavelength in WDM-PON Using Mutually Injected FPLDs and RSOA

We propose and demonstrate a cost-effective wavelength-division-multiplexed passive optical network which can provide an 122-Mb/s upstream baseband and the downstream broadcast signals simultaneously over a single wavelength using light-injected optical sources. The broadband light source for the upstream is implemented using mutually injected Fabry–PÉrot laser diodes (MI-FPLDs) at the central office and the reflective semiconductor optical amplifier is used for the upstream modulation at each optical network unit. For cost-effectiveness, the broadcast signals are directly applied to MI-FPLD. The transmission results show that the error-free operation for the upstream data and the high-quality broadcast signals with 5-dB carrier-to-noise ratio margin can be obtained despite the detrimental effects of periodic noise peaks of MI-FPLD.