1.25–3.125Gb/s per user PON with RSOA as phase modulator for statistical wavelength ONU

• Published in: Optics communications Vol. 357; pp. 34 - 40
• Main Authors: Chu, Guang Yong, Polo, Victor, Lerín, Adolfo, Tabares, Jeison, Cano, Iván N., Prat, Josep
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.12.2015
• Subjects: Coherent communications; Fiber Optics Communications; Fiber optics links and subsystems; Phase modulation; Phase modulation; Fiber optics links and subsystems; Coherent communications; Fiber Optics Communications
• ISSN: 0030-4018; 1873-0310
• DOI: 10.1016/j.optcom.2015.08.046

We report a new scheme to support, cost efficiently, ultra-dense wavelength division multiplexing (UDWDM) for optical access networks. As validating experiment, we apply phase modulation of a reflective semiconductor optical amplifier (RSOA) at the ONU with a single DFB, and simplified coherent receiver at OLT for upstream. We extend the limited 3-dB modulation bandwidth of available uncooled To-can packaged RSOA (~400MHz) and operate it at 3.125Gb/s with the optimal performance for phase modulation using small and large signal measurement characteristics. The optimal condition is selected at input power of 0dBm, with 70mA bias condition. The sensitivities at 3.125Gb/s (at BER=10−3) for heterodyne and intradyne detection reach −34.3dBm and −38.8dBm, respectively. •A low cost optical network unit is proposed.•Maximum operating RSOA with a limited bandwidth is presented.•Phase Modulating Efficiency is measured, and calculated.