Coherent-lite PON with repetition code and single polarization receiver

초록

We propose a coherent-lite passive optical network (PON) that uses a polarization -repetition code for the cost-effective implementation of a 100 Gigabit PON. Our proposed system requires only two digital -to -analog converters for the transmitter, making it less complex and more power -efficient than the dual -polarization coherent or space-time block -coded systems. In the case of implementing the repetition encoder using a polarization -splitting grating coupler, the transmitter can be constructed within a silicon photonics chip without any polarization -dependent components, reducing the cost and complexity of coherent PON transmitters. The transmit diversity, provided by the repetition code, allows the signal to be received using a single -polarization coherent receiver without experiencing any outages, further reducing the cost of the receivers. To reconstruct the transmitted signal regardless of the polarization state of the received signal, we develop digital signal processing algorithms that are appropriate for the proposed system. In simulations, we successfully transmitted the 100-Gb/s repetition -coded quadrature phase shift keying signal over 20 km of standard single -mode fiber with a power budget of either 33.6 dB (without a booster optical amplifier) or 44.7 dB (with a booster amplifier).

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