Abstract

We propose a hybrid passive optical network (PON) architecture supporting time-division multiplexing (TDM) and dense spectrum-sliced wavelength-division multiplexing (SS-WDM) over the legacy PON infrastructure. We use a fiber Bragg grating (FBG)-based self-seeded reflective semiconductor optical amplifier (RSOA) transmitter in conjunction with a recently proposed balanced receiver (BR); identical transceiver pairs are placed at the central office and customer side. Self-seeded RSOAs obviate the need for centralized sources, providing a high power, directly modulated source. Intensity noise mitigation of this thermal source is investigated by operating the RSOA in saturation and employing the recently proposed BR. We study the optimal reflectivity for seeding that balances signal power and noise cleaning to achieve the best bit error rate (BER) possible; channel widths are comparable with dense WDM when using coherent sources.We experimentally demonstrate a symmetrical 1.25 Gb/s dense SS-WDM transmission over the legacy PON infrastructure using our optimized self-seeded RSOA transmitter and the BR. Using a reflective $(18 \pm 2\hbox{\%})$ FBG for self-seeding, we achieve up to 4.5 dBm of output power within a 25 GHz channel. Error free transmission $({\rm BER} < 10^{-10})$ is achieved over a 20 km feeder. We investigate the possibility of colorless ONU operation. The power budget allows 32 users (64 users with reasonable OLT amplification) to be supported over the existing PON infrastructure. Simulations show capacity increases to 128 users when a Reed–Solomon RS(255, 239) forward error correcting code is used.

© 2010 IEEE

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