Adaptive upstream optical power adjustment depending on required power budget in PON access

C. H. Yeh*, Chi Wai Chow, Y. L. Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

According to the present passive optical network (PON) standard, the fiber transmission lengths are from 500 m to 20 km between the optical line terminal (OLT) and different optical network units (ONUs). It will result in difference power losses (ΔP loss) from 4 to 5 dB. Hence, we propose to adjust adaptively the output optical power of the upstream laser diode (LD) depending on the different fiber lengths. With the different fiber transmission lengths, we can properly adjust the bias current and modulation index of upstream LD for energy-saving. We characterize and analyze experimentally the relationship of output optical power and modulation amplitude Vamp under different fiber transmissions in PON access. Moreover, due to the adaptive power control of upstream signal, the optical upstream equalization also can be retrieved with power variation of 1.1 dB in this experiment.

Original languageEnglish
Pages (from-to)4927-4930
Number of pages4
JournalOptics Communications
Volume285
Issue number24
DOIs
StatePublished - 1 Nov 2012

Keywords

  • Energy-saving
  • Green network
  • NG-PON
  • TDM-PON

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