Characteristics of subcarrier modulation and its application in WDM-PONs

Zhaowen Xu, Yang Jing Wen, Wen De Zhong, Tee Hiang Cheng, Manik Attygalle, Xiaofei Cheng, Yong Kee Yeo, Yixin Wang, Chao Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

16 Citations (Scopus)


We mathematically analyze and experimentally investigate the characteristics of subcarrier-modulated (SCM) light. Our investigation shows that the baseband data are also carried on the optical carrier after subcarrier modulation. This residual data introduce crosstalk when the optical carrier is separated from subcarriers and reused for uplink data modulation. The influence of the residual data carried on the optical carrier is studied in three kinds of upstream transmissions based on wavelength-seeded reflective semiconductor optical amplifiers (RSOAs) for carrier-reuse wavelength-division-multiplexed-passive optical networks (WDM-PONs). Results show that the crosstalk can be significantly suppressed with proper selection of the seeding power and operation conditions of downlink Mach-Zehnder modulator (MZM), including driving voltage and bias voltage.
Original languageEnglish
Pages (from-to)2069-2076
Number of pages8
JournalJournal of Lightwave Technology
Issue number12
Publication statusPublished - 15 Jun 2009


  • Downstream carrier reusing
  • Fiber optics
  • Optical crosstalk
  • Optical fibers
  • Optical filters
  • Optical modulation
  • Optical receivers
  • Passive optical network (PON)
  • Passive optical networks
  • Reflective semiconductor optical amplifier (RSOA)
  • Subcarrier modulation (SCM)
  • wavelength-division multiplexing (WDM)

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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