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Li, Xiang; Faruk, Md. Saifuddin; Savory, Seb J.
IEEE photonics technology letters, 2022-Aug.15,-15, 2022-8-15, Volume: 34, Issue: 16Journal Article
In this letter, a bidirectional symmetric 100 Gb/s/<inline-formula> <tex-math notation="LaTeX">\lambda </tex-math></inline-formula> coherent passive optical network (PON) scheme with a simplified optical network unit (ONU) transceiver is proposed and experimentally demonstrated. In the proposed scheme, the downstream signal is generated in a dual-polarization coherent transmitter with Alamouti-coding at the optical line terminal (OLT) side and then received by a single-polarization heterodyne receiver at the ONU side. The upstream signal is generated in a low-cost C-band electro-absorption modulated laser (EML) at the ONU side and then received by a standard dual-polarization integrated coherent receiver at the OLT side. The experimental results show that more than 30 dB power budget is achieved after 25 km standard single mode fibre transmission for both downstream and upstream signal at 100 Gb/s/<inline-formula> <tex-math notation="LaTeX">\lambda </tex-math></inline-formula>. The cost at the ONU side is maintained low as the required bandwidth of the optoelectrical device is >25 GHz and the local oscillator power at the ONU side can be as low as 4 dBm.
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