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Journal Article
Effects of Upstream Incoherent Crosstalk Caused by ASE Noise from Tx-Disabled ONUs in XG-PONs and TWDM-PONs
- Authors
- Han Hyub Lee, Hee Yeal Rhy, Sangsoo Lee, Jong Hyun Lee, Hwan Seok Chung
- Issue Date
- 2016-02
- Citation
- ETRI Journal, v.38, no.1, pp.1-8
- ISSN
- 1225-6463
- Publisher
- 한국전자통신연구원 (ETRI)
- Language
- English
- Type
- Journal Article
- Abstract
- A large incoherent crosstalk (IC) caused by amplified spontaneous emission (ASE) noise power from Txdisabled optical network units and a differential path loss has been shown to degrade upstream transmission performance in time-division multiplexing passive optical networks. This paper considers the IC-induced power penalty of an upstream signal both in an XG-PON and in a TWDM-PON. We investigate the degradation of the extinction ratio and relative intensity noise through a simulation and experiments. For the XG-PON case, we observe a 9.6 dB difference in the level of ASE noise power from Tx-disabled ONUs (hereafter known simply as ASE noise) between our result and the ITU-T XG-PON PMD recommendation. We propose an optical filtering method to mitigate an IC-induced power penalty. In the TWDMPON case, the IC-induced power penalty is naturally negligible because the ASE noise is filtered by a wavelength multiplexer at the optical line terminal. The results provide design guidelines for the level of ASE noise in both XG-PONs and TWDM-PONs.
- KSP Keywords
- Amplified spontaneous emission (ASE) noise, Extinction Ratio(ER), Filtering method, ITU-T, Noise power, Optical Line Terminal, Optical Network Units(ONU), Optical filtering, Passive optical network, Path loss, TWDM-PON