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This paper experimentally demonstrate an all-optical phase modulation technique using both arms of a Mach-Zehnder interferometer structure with Semiconductor Optical Amplifiers (MZI-SOA), with NRZ modulated signals driven at 10 Gbit/s. The proposed optical phase modulator can be used in multi-level modulation signals generation, as an optical routing element, as well in optical code division multiple access transmission systems.

In this paper, we investigate through simulation the feasibility of amplification solutions for WDM ring PON encompassing C+L transmission bands. The system under analysis is composed by a bidirectional pump at 1480 nm with 1 W of power in each direction and 16 channels (8 C band + 8 L band). The simulation describes an 80 km WDM ring with 8 nodes in which 2 channels are added/dropped. Two scenarios were implemented, one with simple Raman amplification that considers that all the pump power travels along the ring being selected the optimal order to drop channels and another with C- band in line EDFA in the link mid length that performs and additional amplification on C band signals. The results of both approaches are compared and their suitability for practical PON is analyzed.